Exemplo n.º 1
0
int main() {  
    int val;  
  
    printf("ALSA library version: %s\n", SND_LIB_VERSION_STR);  
  
    printf("PCM stream types:\n");  
    for (val = 0; val <= SND_PCM_STREAM_LAST; val++) {  
        printf(" %s\n", snd_pcm_stream_name((snd_pcm_stream_t)val));  
    }  
  
    printf("PCM access types:\n");  
    for (val = 0; val <= SND_PCM_ACCESS_LAST; val++) {  
        printf(" %s\n", snd_pcm_access_name((snd_pcm_access_t)val));  
    }  
  
    printf("PCM formats:\n");  
    for (val = 0; val <= SND_PCM_STREAM_LAST; val++) {  
        if (snd_pcm_format_name((snd_pcm_format_t)val) != NULL) {  
            printf(" %s (%s)\n",   
                  snd_pcm_format_name((snd_pcm_format_t)val),  
                  snd_pcm_format_description((snd_pcm_format_t)val));  
        }  
   }  
  
   printf("\nPCM subformats:\n");  
   for (val = 0; val <= SND_PCM_SUBFORMAT_LAST; val++) {  
       printf(" %s (%s)\n", snd_pcm_subformat_name((snd_pcm_subformat_t)val),  
           snd_pcm_subformat_description((snd_pcm_subformat_t)val));  
   }  
   return 0;  
}
Exemplo n.º 2
0
static void header(char *name)
{
	if (!quiet_mode) {
		if (! name)
			name = (stream == SND_PCM_STREAM_PLAYBACK) ? "stdout" : "stdin";
		fprintf(stderr, "%s wave '%s' : ",
			(stream == SND_PCM_STREAM_PLAYBACK) ? _("Playing") : _("Recording"),
			name);
		fprintf(stderr, "%s, ", snd_pcm_format_description(hwparams.format));
		fprintf(stderr, _("Rate %d Hz, "), hwparams.rate);
		if (hwparams.channels == 1)
			fprintf(stderr, _("Mono"));
		else if (hwparams.channels == 2)
			fprintf(stderr, _("Stereo"));
		else
			fprintf(stderr, _("Channels %i"), hwparams.channels);
		fprintf(stderr, "\n");
	}
}
Exemplo n.º 3
0
static int capture(lua_State *lstate) {
	char *card;
	snd_pcm_sw_params_t *sparams;
	int ret, dir, i;
	snd_pcm_format_t f, format;
	unsigned int rate, buffer_time;
	if (rbuf == NULL) {
		rbuf = new_ringbuf(jack_sr, CHANNELS, BUFSECS,
					0.333, 0.667);
		}
	getstring(lstate, "card", &card);
	lua_pop(lstate, 1);
	for (i = 0; i < 20; i++) {
		ret = snd_pcm_open(&handle, card, SND_PCM_STREAM_CAPTURE, 0);
		if (ret < 0) {
			logmsg("can't open %s (%s)\n", card, snd_strerror(ret));
			}
		else {
			break;
			}
		}
	free(card);
	if (ret < 0) return 0;
	if (hparams != NULL) snd_pcm_hw_params_free(hparams);
	snd_pcm_hw_params_malloc(&hparams);
	snd_pcm_hw_params_any(handle, hparams);
	for (f = format = 0; f < SND_PCM_FORMAT_LAST; f++) {
		ret = snd_pcm_hw_params_test_format(handle, hparams, f);
		if (ret == 0) {
			logmsg("- %s\n", snd_pcm_format_name(f));
			format = f;
			}
		}
	ret = snd_pcm_hw_params_set_access(handle, hparams,
				SND_PCM_ACCESS_RW_INTERLEAVED);
	if (ret < 0) {
		logmsg("access %s\n", snd_strerror(ret));
		}
	ret = snd_pcm_hw_params_set_format(handle, hparams, format);
	logmsg("format: %s\n", snd_pcm_format_description(format));
	if (ret < 0) {
		logmsg("format error %s\n", snd_strerror(ret));
		}
	snd_pcm_hw_params_get_buffer_time_max(hparams, &buffer_time, 0);
	rate = jack_sr;
	ret = snd_pcm_hw_params_set_rate(handle, hparams, rate, 0);
logmsg("rate %d\n", rate);
	if (ret < 0) logmsg("rate error %s\n", snd_strerror(ret));
	snd_pcm_hw_params_set_channels(handle, hparams, CHANNELS);
	blocksize = BLOCKSIZE;
	snd_pcm_hw_params_set_period_size(handle, hparams, blocksize, 0);
logmsg("period %ld\n", blocksize);
	snd_pcm_hw_params_set_buffer_time_near(handle, hparams, &buffer_time, &dir);
logmsg("buffer time %u\n", buffer_time);
	if ((ret = snd_pcm_hw_params(handle, hparams)) < 0) {
		logmsg("can't set hardware: %s\n",
			snd_strerror(ret));
		return 0;
		}
	else logmsg("hardware configd\n");
	snd_pcm_sw_params_malloc(&sparams);
	snd_pcm_sw_params_current(handle, sparams);
	snd_pcm_sw_params_set_avail_min(handle, sparams, blocksize);
	snd_pcm_sw_params_set_start_threshold(handle, sparams, 0U);
	if ((ret = snd_pcm_sw_params(handle, sparams)) < 0) {
		logmsg("can't set software: %s\n",
			snd_strerror(ret));
		}
	else logmsg("software configd\n");
	snd_pcm_sw_params_free(sparams);
	pthread_create(&thread_id, NULL, dev_thread, NULL);
	return 0;
	}
Exemplo n.º 4
0
static int aplaypop_open(void)
{
    int err;
    snd_pcm_t *handle;

    if (pcm_handle)
        return 0;

    snd_pcm_info_t *info;
    snd_pcm_info_alloca(&info);

    snd_output_t *log;
    err = snd_output_stdio_attach(&log, stderr, 0);
    assert(err == 0);

    err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_open(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_nonblock(handle, 0);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_nonblock(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_info(handle, info);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_info(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // DOESN'T WORK!
    err = snd_pcm_set_params(handle, SND_PCM_FORMAT_S16_LE,
        SND_PCM_ACCESS_RW_INTERLEAVED, CHANNELS, RATE, 1, 50000);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_set_params(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // RIGHT WAY:
    snd_pcm_hw_params_t *hwparams;
    snd_pcm_sw_params_t *swparams;

    snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
    unsigned int channels = CHANNELS;
    unsigned int rate = RATE;

    snd_pcm_hw_params_alloca(&hwparams);
    snd_pcm_sw_params_alloca(&swparams);

    err = snd_pcm_hw_params_any(handle, hwparams);
    if (err != 0) {
        fprintf(stderr, "Broken configuration for this PCM: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_hw_params_set_access(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_hw_params_set_format(handle, hwparams, format);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_hw_params_set_format(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_hw_params_set_channels(handle, hwparams, channels);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_hw_params_set_channels(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, 0);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_hw_params_set_rate_near(): %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
/*
    unsigned buffer_time = 0;
    snd_pcm_uframes_t buffer_frames = 0;

    if (buffer_time == 0 && buffer_frames == 0) {
        err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
        assert(err == 0);
        if (buffer_time > 500000)
            buffer_time = 500000;
    }

    unsigned period_time = 0;
    snd_pcm_uframes_t period_frames = 0;

    if (period_time == 0 && period_frames == 0) {
        if (buffer_time > 0)
            period_time = buffer_time / 4;
        else
            period_frames = buffer_frames / 4;
    }

    if (period_time > 0)
        err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0);
    else
        err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_frames, 0);
    assert(err == 0);

    if (buffer_time > 0)
        err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0);
    else
        err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_frames);
    assert(err == 0);

    int monotonic = snd_pcm_hw_params_is_monotonic(hwparams);
    int can_pause = snd_pcm_hw_params_can_pause(hwparams);
*/
    err = snd_pcm_hw_params(handle, hwparams);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_hw_params(): %s\n", snd_strerror(err));
        snd_pcm_hw_params_dump(hwparams, log);
        exit(EXIT_FAILURE);
    }
    snd_pcm_uframes_t chunk_size = 0;
    snd_pcm_hw_params_get_period_size(hwparams, &chunk_size, 0);
    snd_pcm_uframes_t buffer_size;
    snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
    if (chunk_size == buffer_size) {
        fprintf(stderr, "Can't use period equal to buffer size (%lu == %lu)",
              chunk_size, buffer_size);
        exit(EXIT_FAILURE);
    }
    snd_pcm_sw_params_current(handle, swparams);

    err = snd_pcm_sw_params_set_avail_min(handle, swparams, chunk_size);
    assert(err == 0);

    /* round up to closest transfer boundary */
    int start_delay = 0;
    snd_pcm_uframes_t start_threshold;
    if (start_delay <= 0)
        start_threshold = buffer_size + (double) rate * start_delay / 1000000;
    else
        start_threshold = (double) rate * start_delay / 1000000;
    start_threshold = start_threshold < 1 ? 1 : start_threshold > buffer_size ? buffer_size : start_threshold;
    err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
    assert(err == 0);

    int stop_delay = 0;
    snd_pcm_uframes_t stop_threshold;
    if (stop_delay <= 0)
        stop_threshold = buffer_size + (double) rate * stop_delay / 1000000;
    else
        stop_threshold = (double) rate * stop_delay / 1000000;
    err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
    assert(err == 0);

    err = snd_pcm_sw_params(handle, swparams);
    if (err != 0) {
        fprintf(stderr, "snd_pcm_sw_params(): %s\n", snd_strerror(err));
        snd_pcm_sw_params_dump(swparams, log);
        exit(EXIT_FAILURE);
    }
    // END OF THE RIGHT WAY

//  snd_pcm_dump(handle, log);

    size_t bits_per_sample = snd_pcm_format_physical_width(format);
    size_t bits_per_frame = bits_per_sample * channels;
    size_t chunk_bytes = chunk_size * bits_per_frame / 8;
    //audiobuf = realloc(audiobuf, chunk_bytes);

    fprintf(stderr, "%s: %s, Rate %d Hz, Channels=%u\n",
        snd_pcm_format_name(format), snd_pcm_format_description(format),
        rate, channels);
    fprintf(stderr, "  bits_per_sample=%u, bits_per_frame=%u, chunk_bytes=%u\n",
        bits_per_sample, bits_per_frame, chunk_bytes);

    frame_bytes = bits_per_frame / 8;
    pcm_handle = handle;
    return 0;
}
Exemplo n.º 5
0
    bool open()
    {
        // Open the Alsa playback device.
        int err=-1,count=0;
        unsigned int        freakuency = frequency;

        while((count < 5) && (err < 0)) {
            err = snd_pcm_open
                  ( &handle,  ALSA_OUTPUT_NAME, SND_PCM_STREAM_PLAYBACK, 0 );

            if(err < 0) {
                count++;
                qWarning()<<"QAudioOutput::open() err="<<err<<", count="<<count;
            }
        }
        if (( err < 0)||(handle == 0)) {
            qWarning( "QAudioOuput: snd_pcm_open: error %d", err );
            return false;
        }
        snd_pcm_nonblock( handle, 0 );

        // Set the desired HW parameters.
        snd_pcm_hw_params_t *hwparams;
        snd_pcm_hw_params_alloca( &hwparams );

        err = snd_pcm_hw_params_any( handle, hwparams );
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_any: err %d", err);
            return false;
        }

        err = snd_pcm_hw_params_set_access( handle, hwparams, access );
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_access: err %d", err);
            return false;
        }

        err = snd_pcm_hw_params_set_format( handle, hwparams,
             ( bitsPerSample == 16 ? SND_PCM_FORMAT_S16
                                   : SND_PCM_FORMAT_U8 ) );
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_format: err %d", err);
            return false;
        }

        err = snd_pcm_hw_params_set_channels
            ( handle, hwparams, (unsigned int)channels );
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_channels: err %d", err);
            return false;
        }

        err = snd_pcm_hw_params_set_rate_near
            ( handle, hwparams, &freakuency, 0 );
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_rate_near: err %d", err);
            return false;
        }

#ifndef ALSA_BUFFER_SIZE
        err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_buffer_time_near: err %d",err);
        }
        err = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_get_buffer_size: err %d",err);
        }
#else
        buffer_size = ALSA_BUFFER_SIZE;
        err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_buffer_time_near: err %d",err);
        }
#endif

#ifndef ALSA_PERIOD_SIZE
        period_time = buffer_time/4;
        err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_period_time_near: err %d",err);
        }
#else
        period_size = ALSA_PERIOD_SIZE;
        err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, 0);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params_set_period_size_near: err %d",err);
        }
#endif

        err = snd_pcm_hw_params(handle, hwparams);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_hw_params: err %d", err);
            return false;
        }

        int                  dir;
        unsigned int         vval, vval2;
        snd_pcm_access_t     val;
        snd_pcm_format_t     fval;
        snd_pcm_subformat_t  sval;


        qLog(QAudioOutput) << "PCM handle name =" << snd_pcm_name(handle);
        qLog(QAudioOutput) << "PCM state =" << snd_pcm_state_name(snd_pcm_state(handle));
        snd_pcm_hw_params_get_access(hwparams,&val);
        vval = (unsigned int)val;
        if ( (int)vval != (int)access ) {
            qWarning( "QAudioInput: access type not set, want %s got %s",
                    snd_pcm_access_name((snd_pcm_access_t)access),
                    snd_pcm_access_name((snd_pcm_access_t)vval) );
            access = (snd_pcm_access_t)vval;
        }
        qLog(QAudioOutput) << "access type =" << snd_pcm_access_name((snd_pcm_access_t)vval);
        snd_pcm_hw_params_get_format(hwparams, &fval);
        vval = (unsigned int)fval;
        if ( (int)vval != (int)format ) {
            qWarning( "QAudioInput: format type not set, want %s got %s",
                    snd_pcm_format_name((snd_pcm_format_t)format),
                    snd_pcm_format_name((snd_pcm_format_t)vval) );
            format = (snd_pcm_format_t)vval;
        }
        qLog(QAudioOutput) << QString("format = '%1' (%2)").arg(snd_pcm_format_name((snd_pcm_format_t)vval))
            .arg(snd_pcm_format_description((snd_pcm_format_t)vval))
            .toLatin1().constData();
        snd_pcm_hw_params_get_subformat(hwparams,&sval);
        vval = (unsigned int)sval;
        qLog(QAudioOutput) << QString("subformat = '%1' (%2)").arg(snd_pcm_subformat_name((snd_pcm_subformat_t)vval))
            .arg(snd_pcm_subformat_description((snd_pcm_subformat_t)vval))
            .toLatin1().constData();
        snd_pcm_hw_params_get_channels(hwparams, &vval);
        if ( (int)vval != (int)channels ) {
            qWarning( "QAudioInput: channels type not set, want %d got %d",channels,vval);
            channels = vval;
        }
        qLog(QAudioOutput) << "channels =" << vval;
        snd_pcm_hw_params_get_rate(hwparams, &vval, &dir);
        if ( (int)vval != (int)frequency ) {
            qWarning( "QAudioInput: frequency type not set, want %d got %d",frequency,vval);
            frequency = vval;
        }
        qLog(QAudioOutput) << "rate =" << vval << "bps";
        snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir);
        qLog(QAudioOutput) << "period time =" << period_time << "us";
        snd_pcm_hw_params_get_period_size(hwparams,&period_size, &dir);
        qLog(QAudioOutput) << "period size =" << (int)period_size << "frames";
        qLog(QAudioOutput) << "buffer time =" << (int)buffer_time << "us";
        qLog(QAudioOutput) << "buffer size =" << (int)buffer_size << "frames";
        snd_pcm_hw_params_get_periods(hwparams, &vval, &dir);
        periods = vval;
        qLog(QAudioOutput) << "periods per buffer =" << vval << "frames";
        snd_pcm_hw_params_get_rate_numden(hwparams, &vval, &vval2);
        qLog(QAudioOutput) << QString("exact rate = %1/%2 bps").arg(vval).arg(vval2).toLatin1().constData();
        vval = snd_pcm_hw_params_get_sbits(hwparams);
        qLog(QAudioOutput) << "significant bits =" << vval;
        vval = snd_pcm_hw_params_is_batch(hwparams);
        qLog(QAudioOutput) << "is batch =" << vval;
        vval = snd_pcm_hw_params_is_block_transfer(hwparams);
        qLog(QAudioOutput) << "is block transfer =" << vval;
        vval = snd_pcm_hw_params_is_double(hwparams);
        qLog(QAudioOutput) << "is double =" << vval;
        vval = snd_pcm_hw_params_is_half_duplex(hwparams);
        qLog(QAudioOutput) << "is half duplex =" << vval;
        vval = snd_pcm_hw_params_is_joint_duplex(hwparams);
        qLog(QAudioOutput) << "is joint duplex =" << vval;
        vval = snd_pcm_hw_params_can_overrange(hwparams);
        qLog(QAudioOutput) << "can overrange =" << vval;
        vval = snd_pcm_hw_params_can_mmap_sample_resolution(hwparams);
        qLog(QAudioOutput) << "can mmap =" << vval;
        vval = snd_pcm_hw_params_can_pause(hwparams);
        qLog(QAudioOutput) << "can pause =" << vval;
        vval = snd_pcm_hw_params_can_resume(hwparams);
        qLog(QAudioOutput) << "can resume =" << vval;
        vval = snd_pcm_hw_params_can_sync_start(hwparams);
        qLog(QAudioOutput) << "can sync start =" << vval;

        // Set the desired SW parameters.
        snd_pcm_sw_params_t *swparams;
        snd_pcm_sw_params_alloca(&swparams);
        err = snd_pcm_sw_params_current(handle, swparams);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_sw_params_current: err %d",err);
        }
        err = snd_pcm_sw_params_set_start_threshold(handle,swparams,buffer_size);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_sw_params_set_start_threshold: err %d",err);
        }
        err = snd_pcm_sw_params_set_stop_threshold(handle,swparams,buffer_size);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_sw_params_set_stop_threshold: err %d",err);
        }
        err = snd_pcm_sw_params_set_avail_min(handle, swparams,period_size);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_sw_params_set_avail_min: err %d",err);
        }
        err = snd_pcm_sw_params(handle, swparams);
        if ( err < 0 ) {
            qWarning( "QAudioOutput: snd_pcm_sw_params: err %d",err);
        }

        // Prepare for audio output.
        snd_pcm_prepare( handle );

        return true;
    }
Exemplo n.º 6
0
int main( int argc, char *argv[] )
{
    struct structArgs cmdArgs;
	unsigned int val, val2;
	int dir;
    int errNum;
	cmdArgs.card = 0;		// Default card.
	cmdArgs.control = 1;	// Default control.


    // ************************************************************************
    //  ALSA control elements.
    // ************************************************************************
    snd_pcm_t *pcmp;
    snd_pcm_hw_params_t *params;
//	snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK;
	snd_pcm_stream_t stream = SND_PCM_STREAM_CAPTURE;
    snd_pcm_uframes_t frames;


    // ************************************************************************
    //  Get command line parameters.
    // ************************************************************************
    argp_parse( &argp, argc, argv, 0, 0, &cmdArgs );

    printf( "Card = %i\n", cmdArgs.card );
    printf( "Control = %i\n", cmdArgs.control );
    sprintf( cmdArgs.deviceID, "hw:%i,%i", cmdArgs.card, cmdArgs.control );
	printf( "Using device %s :", cmdArgs.deviceID );

    /* Allocate a hardware parameters object. */
    if ( snd_pcm_hw_params_alloca( &params ) < 0 )
    {
    	fprintf( stderr, "Unable to allocate.\n" );
    	return -1;
   	}
    /* Open PCM device for playback. */
//    if ( snd_pcm_open( &pcmp, cmdArgs.deviceID, stream, 0 ) < 0 )
//    {
//        fprintf( stderr, "Unable to open pcm device.\n" );
//    	return -1;
//    }
    /* Fill it in with default values. */
//    if ( snd_pcm_hw_params_any( pcmp, params ) < 0
//    {
//    	fprintf( stderr, "Unable to set default values.\n" );
//    	return -1;
//    }
    /* Interleaved mode */
//    snd_pcm_hw_params_set_access( pcmp, params,
//    		SND_PCM_ACCESS_RW_INTERLEAVED );

    /* Signed 16-bit little-endian format */
    snd_pcm_hw_params_set_format( pcmp, params,
        	SND_PCM_FORMAT_S16_LE );

    /* Two channels (stereo) */
    snd_pcm_hw_params_set_channels( pcmp, params, 2 );

    /* 44100 bits/second sampling rate (CD quality) */
    val = 44100;
    snd_pcm_hw_params_set_rate_near( pcmp, params, &val, &dir );

    /* Write the parameters to the driver */
    errNum = snd_pcm_hw_params( pcmp, params );
    if ( errNum < 0 )
    {
        fprintf(stderr, "unable to set hw parameters: %s\n",
            snd_strerror( errNum ));
        exit( 1 );
    }

    /* Display information about the PCM interface */

    printf( "PCM handle name = '%s'\n", snd_pcm_name( pcmp ));

    printf("PCM state = %s\n", snd_pcm_state_name( snd_pcm_state( pcmp )));

    snd_pcm_hw_params_get_access( params, ( snd_pcm_access_t * ) &val );
    printf( "access type = %s\n",
        snd_pcm_access_name(( snd_pcm_access_t ) val ));

    snd_pcm_hw_params_get_format( params, ( snd_pcm_format_t * ) &val );
    printf( "format = '%s' (%s)\n",
        snd_pcm_format_name(( snd_pcm_format_t ) val ),
        snd_pcm_format_description(( snd_pcm_format_t ) val ));

    snd_pcm_hw_params_get_subformat( params,
        ( snd_pcm_subformat_t * ) &val );
    printf( "subformat = '%s' (%s)\n",
        snd_pcm_subformat_name(( snd_pcm_subformat_t ) val ),
        snd_pcm_subformat_description((
        snd_pcm_subformat_t ) val ));

    snd_pcm_hw_params_get_channels( params, &val );
    printf( "channels = %d\n", val );

    snd_pcm_hw_params_get_rate( params, &val, &dir );
    printf( "rate = %d bps\n", val );

    snd_pcm_hw_params_get_period_time( params, &val, &dir );
    printf( "period time = %d us\n", val );

    snd_pcm_hw_params_get_period_size( params, &frames, &dir );
    printf( "period size = %d frames\n", ( int ) frames );

    snd_pcm_hw_params_get_buffer_time( params, &val, &dir );
    printf( "buffer time = %d us\n", val );

    snd_pcm_hw_params_get_buffer_size( params,
        ( snd_pcm_uframes_t * ) &val );
    printf( "buffer size = %d frames\n", val );

    snd_pcm_hw_params_get_periods( params, &val, &dir );
    printf( "periods per buffer = %d frames\n", val );

    snd_pcm_hw_params_get_rate_numden( params, &val, &val2 );
    printf( "exact rate = %d/%d bps\n", val, val2 );

    val = snd_pcm_hw_params_get_sbits( params );
    printf( "significant bits = %d\n", val );

//    snd_pcm_hw_params_get_tick_time( params, &val, &dir );
//    printf( "tick time = %d us\n", val );

    val = snd_pcm_hw_params_is_batch( params );
    printf( "is batch = %d\n", val );

    val = snd_pcm_hw_params_is_block_transfer( params );
    printf( "is block transfer = %d\n", val );

    val = snd_pcm_hw_params_is_double( params );
    printf( "is double = %d\n", val );

    val = snd_pcm_hw_params_is_half_duplex( params );
    printf( "is half duplex = %d\n", val );

    val = snd_pcm_hw_params_is_joint_duplex( params );
    printf( "is joint duplex = %d\n", val );

    val = snd_pcm_hw_params_can_overrange( params );
    printf( "can overrange = %d\n", val );

    val = snd_pcm_hw_params_can_mmap_sample_resolution( params );
    printf( "can mmap = %d\n", val );

    val = snd_pcm_hw_params_can_pause( params );
    printf( "can pause = %d\n", val );

    val = snd_pcm_hw_params_can_resume( params );
    printf( "can resume = %d\n", val );

    val = snd_pcm_hw_params_can_sync_start( params );
    printf( "can sync start = %d\n", val );
    snd_pcm_close( pcmp );

    return 0;
}
Exemplo n.º 7
0
int main()
{
    int rc;
    snd_pcm_t* handle;
    snd_pcm_hw_params_t* params;
    unsigned int val;
    unsigned int val2;
    int dir;
    snd_pcm_uframes_t frames;

    if ( (rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0)
    {
        std::cerr << "unable to open pcm devices: " << snd_strerror(rc) << std::endl;
        exit(1);
    }

    snd_pcm_hw_params_alloca(&params);

    snd_pcm_hw_params_any(handle, params);

    snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);

    snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);

    snd_pcm_hw_params_set_channels(handle, params, 2);

    val = 44100;

    snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir);

    if ( (rc = snd_pcm_hw_params(handle, params)) < 0)
    {
        std::cerr << "unable to set hw parameters: " << snd_strerror(rc) << std::endl;
        exit(1);
    }

    std::cout << "PCM handle name = " << snd_pcm_name(handle) << std::endl;

    std::cout << "PCM state = " << snd_pcm_state_name(snd_pcm_state(handle)) << std::endl;

    snd_pcm_hw_params_get_access(params, (snd_pcm_access_t *)&val);

    std::cout << "access type = " << snd_pcm_access_name((snd_pcm_access_t)val) << std::endl;

    snd_pcm_hw_params_get_format(params, (snd_pcm_format_t*)(&val));

    std::cout << "format = '" << snd_pcm_format_name((snd_pcm_format_t)val) << "' (" << snd_pcm_format_description((snd_pcm_format_t)val) << ")" << std::endl;

    snd_pcm_hw_params_get_subformat(params, (snd_pcm_subformat_t *)&val);
    std::cout << "subformat = '" <<
              snd_pcm_subformat_name((snd_pcm_subformat_t)val) << "' (" << snd_pcm_subformat_description((snd_pcm_subformat_t)val) << ")" << std::endl;

    snd_pcm_hw_params_get_channels(params, &val);
    std::cout << "channels = " << val << std::endl;

    snd_pcm_hw_params_get_rate(params, &val, &dir);
    std::cout << "rate = " << val << " bps" << std::endl;

    snd_pcm_hw_params_get_period_time(params, &val, &dir);
    std::cout << "period time = " << val << " us" << std::endl;

    snd_pcm_hw_params_get_period_size(params, &frames, &dir);
    std::cout << "period size = " << static_cast<int>(frames) << " frames" << std::endl;

    snd_pcm_hw_params_get_buffer_time(params, &val, &dir);
    std::cout << "buffer time = " << val << " us" << std::endl;

    snd_pcm_hw_params_get_buffer_size(params, (snd_pcm_uframes_t *) &val);
    std::cout << "buffer size = " << val << " frames" << std::endl;

    snd_pcm_hw_params_get_periods(params, &val, &dir);
    std::cout << "periods per buffer = " << val << " frames" << std::endl;

    snd_pcm_hw_params_get_rate_numden(params, &val, &val2);
    std::cout << "exact rate = " << val/val2 << " bps" << std::endl;

    val = snd_pcm_hw_params_get_sbits(params);
    std::cout << "significant bits = " << val << std::endl;

    snd_pcm_hw_params_get_tick_time(params, &val, &dir);
    std::cout << "tick time = " << val << " us" << std::endl;

    val = snd_pcm_hw_params_is_batch(params);
    std::cout << "is batch = " << val << std::endl;

    val = snd_pcm_hw_params_is_block_transfer(params);
    std::cout << "is block transfer = " << val << std::endl;

    val = snd_pcm_hw_params_is_double(params);
    std::cout << "is double = " << val << std::endl;

    val = snd_pcm_hw_params_is_half_duplex(params);
    std::cout << "is half duplex = " << val << std::endl;

    val = snd_pcm_hw_params_is_joint_duplex(params);
    std::cout << "is joint duplex = " << val << std::endl;

    val = snd_pcm_hw_params_can_overrange(params);
    std::cout << "can overrange = " << val << std::endl;

    val = snd_pcm_hw_params_can_mmap_sample_resolution(params);
    std::cout << "can mmap = " << val << std::endl;

    val = snd_pcm_hw_params_can_pause(params);
    std::cout << "can pause = " << val << std::endl;

    val = snd_pcm_hw_params_can_resume(params);
    std::cout << "can resume = " << val << std::endl;

    val = snd_pcm_hw_params_can_sync_start(params);
    std::cout << "can sync start = " << val << std::endl;

    snd_pcm_close(handle);

    return 0;
}
Exemplo n.º 8
0
int main() {
  int rc;
  snd_pcm_t *handle;
  snd_pcm_hw_params_t *params;
  unsigned int val, val2;
  int dir;
  snd_pcm_uframes_t frames;
  
  /* Open PCM device for playback. */
  rc = snd_pcm_open(&handle, "default",
                    SND_PCM_STREAM_PLAYBACK, 0);
  if (rc < 0) {
    fprintf(stderr, 
            "unable to open pcm device: %s\n",
            snd_strerror(rc));
    exit(1);
  }
  
  /* Allocate a hardware parameters object. */
  snd_pcm_hw_params_alloca(&params);

  /* Fill it in with default values. */
  snd_pcm_hw_params_any(handle, params);

  /* Set the desired hardware parameters. */

  /* Interleaved mode */
  snd_pcm_hw_params_set_access(handle, params,
                      SND_PCM_ACCESS_RW_INTERLEAVED);

  /* Signed 16-bit little-endian format */
  snd_pcm_hw_params_set_format(handle, params, 
                              SND_PCM_FORMAT_S16_LE);

  /* Two channels (stereo) */
  snd_pcm_hw_params_set_channels(handle, params, 2);

  /* 44100 bits/second sampling rate (CD quality) */
  val = 44100;
  snd_pcm_hw_params_set_rate_near(handle, 
                                 params, &val, &dir);

  /* Write the parameters to the driver */
  rc = snd_pcm_hw_params(handle, params);
  if (rc < 0) {
    fprintf(stderr, 
            "unable to set hw parameters: %s\n",
            snd_strerror(rc));
    exit(1);
  }

  /* Display information about the PCM interface */

  printf("PCM handle name = '%s'\n",
         snd_pcm_name(handle));

  printf("PCM state = %s\n",
         snd_pcm_state_name(snd_pcm_state(handle)));

  snd_pcm_hw_params_get_access(params, 
                          (snd_pcm_access_t *) &val);
  printf("access type = %s\n", 
         snd_pcm_access_name((snd_pcm_access_t)val));

  snd_pcm_hw_params_get_format(params, &val);
  printf("format = '%s' (%s)\n",
    snd_pcm_format_name((snd_pcm_format_t)val),
    snd_pcm_format_description(
                             (snd_pcm_format_t)val));

  snd_pcm_hw_params_get_subformat(params,
                        (snd_pcm_subformat_t *)&val);
  printf("subformat = '%s' (%s)\n",
    snd_pcm_subformat_name((snd_pcm_subformat_t)val),
    snd_pcm_subformat_description(
                          (snd_pcm_subformat_t)val));

  snd_pcm_hw_params_get_channels(params, &val);
  printf("channels = %d\n", val);

  snd_pcm_hw_params_get_rate(params, &val, &dir);
  printf("rate = %d bps\n", val);

  snd_pcm_hw_params_get_period_time(params, 
                                    &val, &dir);
  printf("period time = %d us\n", val);

  snd_pcm_hw_params_get_period_size(params, 
                                    &frames, &dir);
  printf("period size = %d frames\n", (int)frames);

  snd_pcm_hw_params_get_buffer_time(params, 
                                    &val, &dir);
  printf("buffer time = %d us\n", val);

  snd_pcm_hw_params_get_buffer_size(params,
                         (snd_pcm_uframes_t *) &val);
  printf("buffer size = %d frames\n", val);

  snd_pcm_hw_params_get_periods(params, &val, &dir);
  printf("periods per buffer = %d frames\n", val);

  snd_pcm_hw_params_get_rate_numden(params,
                                    &val, &val2);
  printf("exact rate = %d/%d bps\n", val, val2);

  val = snd_pcm_hw_params_get_sbits(params);
  printf("significant bits = %d\n", val);

  snd_pcm_hw_params_get_tick_time(params, 
                                  &val, &dir);
  printf("tick time = %d us\n", val);

  val = snd_pcm_hw_params_is_batch(params);
  printf("is batch = %d\n", val);

  val = snd_pcm_hw_params_is_block_transfer(params);
  printf("is block transfer = %d\n", val);

  val = snd_pcm_hw_params_is_double(params);
  printf("is double = %d\n", val);

  val = snd_pcm_hw_params_is_half_duplex(params);
  printf("is half duplex = %d\n", val);

  val = snd_pcm_hw_params_is_joint_duplex(params);
  printf("is joint duplex = %d\n", val);

  val = snd_pcm_hw_params_can_overrange(params);
  printf("can overrange = %d\n", val);

  val = snd_pcm_hw_params_can_mmap_sample_resolution(params);
  printf("can mmap = %d\n", val);

  val = snd_pcm_hw_params_can_pause(params);
  printf("can pause = %d\n", val);

  val = snd_pcm_hw_params_can_resume(params);
  printf("can resume = %d\n", val);

  val = snd_pcm_hw_params_can_sync_start(params);
  printf("can sync start = %d\n", val);

  snd_pcm_close(handle);

  return 0;
}
Exemplo n.º 9
0
/*
    open & setup audio device
    return: 1=success 0=fail
*/
static int init(int rate_hz, int channels, int format, int flags)
{
    unsigned int alsa_buffer_time = 500000; /* 0.5 s */
    unsigned int alsa_fragcount = 16;
    int err;
    int block;
    strarg_t device;
    snd_pcm_uframes_t chunk_size;
    snd_pcm_uframes_t bufsize;
    snd_pcm_uframes_t boundary;
    const opt_t subopts[] = {
      {"block", OPT_ARG_BOOL, &block, NULL},
      {"device", OPT_ARG_STR, &device, str_maxlen},
      {NULL}
    };

    char alsa_device[ALSA_DEVICE_SIZE + 1];
    // make sure alsa_device is null-terminated even when using strncpy etc.
    memset(alsa_device, 0, ALSA_DEVICE_SIZE + 1);

    mp_msg(MSGT_AO,MSGL_V,"alsa-init: requested format: %d Hz, %d channels, %x\n", rate_hz,
	channels, format);
    alsa_handler = NULL;
#if SND_LIB_VERSION >= 0x010005
    mp_msg(MSGT_AO,MSGL_V,"alsa-init: using ALSA %s\n", snd_asoundlib_version());
#else
    mp_msg(MSGT_AO,MSGL_V,"alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR);
#endif

    snd_lib_error_set_handler(alsa_error_handler);

    ao_data.samplerate = rate_hz;
    ao_data.format = format;
    ao_data.channels = channels;

    switch (format)
      {
      case AF_FORMAT_S8:
	alsa_format = SND_PCM_FORMAT_S8;
	break;
      case AF_FORMAT_U8:
	alsa_format = SND_PCM_FORMAT_U8;
	break;
      case AF_FORMAT_U16_LE:
	alsa_format = SND_PCM_FORMAT_U16_LE;
	break;
      case AF_FORMAT_U16_BE:
	alsa_format = SND_PCM_FORMAT_U16_BE;
	break;
      case AF_FORMAT_AC3_LE:
      case AF_FORMAT_S16_LE:
      case AF_FORMAT_IEC61937_LE:
	alsa_format = SND_PCM_FORMAT_S16_LE;
	break;
      case AF_FORMAT_AC3_BE:
      case AF_FORMAT_S16_BE:
      case AF_FORMAT_IEC61937_BE:
	alsa_format = SND_PCM_FORMAT_S16_BE;
	break;
      case AF_FORMAT_U32_LE:
	alsa_format = SND_PCM_FORMAT_U32_LE;
	break;
      case AF_FORMAT_U32_BE:
	alsa_format = SND_PCM_FORMAT_U32_BE;
	break;
      case AF_FORMAT_S32_LE:
	alsa_format = SND_PCM_FORMAT_S32_LE;
	break;
      case AF_FORMAT_S32_BE:
	alsa_format = SND_PCM_FORMAT_S32_BE;
	break;
      case AF_FORMAT_U24_LE:
	alsa_format = SND_PCM_FORMAT_U24_3LE;
	break;
      case AF_FORMAT_U24_BE:
	alsa_format = SND_PCM_FORMAT_U24_3BE;
	break;
      case AF_FORMAT_S24_LE:
	alsa_format = SND_PCM_FORMAT_S24_3LE;
	break;
      case AF_FORMAT_S24_BE:
	alsa_format = SND_PCM_FORMAT_S24_3BE;
	break;
      case AF_FORMAT_FLOAT_LE:
	alsa_format = SND_PCM_FORMAT_FLOAT_LE;
	break;
      case AF_FORMAT_FLOAT_BE:
	alsa_format = SND_PCM_FORMAT_FLOAT_BE;
	break;
      case AF_FORMAT_MU_LAW:
	alsa_format = SND_PCM_FORMAT_MU_LAW;
	break;
      case AF_FORMAT_A_LAW:
	alsa_format = SND_PCM_FORMAT_A_LAW;
	break;

      default:
	alsa_format = SND_PCM_FORMAT_MPEG; //? default should be -1
	break;
      }

    //subdevice parsing
    // set defaults
    block = 1;
    /* switch for spdif
     * sets opening sequence for SPDIF
     * sets also the playback and other switches 'on the fly'
     * while opening the abstract alias for the spdif subdevice
     * 'iec958'
     */
    if (AF_FORMAT_IS_IEC61937(format)) {
	device.str = "iec958";
	mp_msg(MSGT_AO,MSGL_V,"alsa-spdif-init: playing AC3/iec61937/iec958, %i channels\n", channels);
    }
  else
        /* in any case for multichannel playback we should select
         * appropriate device
         */
        switch (channels) {
	case 1:
	case 2:
	  device.str = "default";
	  mp_msg(MSGT_AO,MSGL_V,"alsa-init: setup for 1/2 channel(s)\n");
	  break;
	case 4:
	  if (alsa_format == SND_PCM_FORMAT_FLOAT_LE)
	    // hack - use the converter plugin
	    device.str = "plug:surround40";
	  else
	    device.str = "surround40";
	  mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround40\n");
	  break;
	case 6:
	  if (alsa_format == SND_PCM_FORMAT_FLOAT_LE)
	    device.str = "plug:surround51";
	  else
	    device.str = "surround51";
	  mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround51\n");
	  break;
	case 8:
	  if (alsa_format == SND_PCM_FORMAT_FLOAT_LE)
	    device.str = "plug:surround71";
	  else
	    device.str = "surround71";
	  mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround71\n");
	  break;
	default:
	  device.str = "default";
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_ChannelsNotSupported,channels);
        }
    device.len = strlen(device.str);
    if (subopt_parse(ao_subdevice, subopts) != 0) {
        print_help();
        return 0;
    }
    parse_device(alsa_device, device.str, device.len);

    mp_msg(MSGT_AO,MSGL_V,"alsa-init: using device %s\n", alsa_device);

    if (!alsa_handler) {
      int open_mode = block ? 0 : SND_PCM_NONBLOCK;
      int isac3 =  AF_FORMAT_IS_IEC61937(format);
      //modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC
      mp_msg(MSGT_AO,MSGL_V,"alsa-init: opening device in %sblocking mode\n", block ? "" : "non-");
      if ((err = try_open_device(alsa_device, open_mode, isac3)) < 0)
	{
	  if (err != -EBUSY && !block) {
	    mp_msg(MSGT_AO,MSGL_INFO,MSGTR_AO_ALSA_OpenInNonblockModeFailed);
	    if ((err = try_open_device(alsa_device, 0, isac3)) < 0) {
	      mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_PlaybackOpenError, snd_strerror(err));
	      return 0;
	    }
	  } else {
	    mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_PlaybackOpenError, snd_strerror(err));
	    return 0;
	  }
	}

      if ((err = snd_pcm_nonblock(alsa_handler, 0)) < 0) {
         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_ErrorSetBlockMode, snd_strerror(err));
      } else {
	mp_msg(MSGT_AO,MSGL_V,"alsa-init: device reopened in blocking mode\n");
      }

      snd_pcm_hw_params_alloca(&alsa_hwparams);
      snd_pcm_sw_params_alloca(&alsa_swparams);

      // setting hw-parameters
      if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetInitialParameters,
		 snd_strerror(err));
	  return 0;
	}

      err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
					 SND_PCM_ACCESS_RW_INTERLEAVED);
      if (err < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetAccessType,
	       snd_strerror(err));
	return 0;
      }

      /* workaround for nonsupported formats
	 sets default format to S16_LE if the given formats aren't supported */
      if ((err = snd_pcm_hw_params_test_format(alsa_handler, alsa_hwparams,
                                             alsa_format)) < 0)
      {
         mp_msg(MSGT_AO,MSGL_INFO,
		MSGTR_AO_ALSA_FormatNotSupportedByHardware, af_fmt2str_short(format));
         alsa_format = SND_PCM_FORMAT_S16_LE;
         if (AF_FORMAT_IS_AC3(ao_data.format))
           ao_data.format = AF_FORMAT_AC3_LE;
         else if (AF_FORMAT_IS_IEC61937(ao_data.format))
           ao_data.format = AF_FORMAT_IEC61937_LE;
         else
         ao_data.format = AF_FORMAT_S16_LE;
      }

      if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
					      alsa_format)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetFormat,
		 snd_strerror(err));
	  return 0;
	}

      if ((err = snd_pcm_hw_params_set_channels_near(alsa_handler, alsa_hwparams,
						     &ao_data.channels)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetChannels,
		 snd_strerror(err));
	  return 0;
	}

      /* workaround for buggy rate plugin (should be fixed in ALSA 1.0.11)
         prefer our own resampler, since that allows users to choose the resampler,
         even per file if desired */
#if SND_LIB_VERSION >= 0x010009
      if ((err = snd_pcm_hw_params_set_rate_resample(alsa_handler, alsa_hwparams,
						     0)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToDisableResampling,
		 snd_strerror(err));
	  return 0;
	}
#endif

      if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams,
						 &ao_data.samplerate, NULL)) < 0)
        {
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetSamplerate2,
		 snd_strerror(err));
	  return 0;
        }

      bytes_per_sample = af_fmt2bits(ao_data.format) / 8;
      bytes_per_sample *= ao_data.channels;
      ao_data.bps = ao_data.samplerate * bytes_per_sample;

	if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams,
							  &alsa_buffer_time, NULL)) < 0)
	  {
	    mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetBufferTimeNear,
		   snd_strerror(err));
	    return 0;
	  }

	if ((err = snd_pcm_hw_params_set_periods_near(alsa_handler, alsa_hwparams,
						      &alsa_fragcount, NULL)) < 0) {
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetPeriods,
		 snd_strerror(err));
	  return 0;
	}

      /* finally install hardware parameters */
      if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetHwParameters,
		 snd_strerror(err));
	  return 0;
	}
      // end setting hw-params


      // gets buffersize for control
      if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams, &bufsize)) < 0)
	{
	  mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetBufferSize, snd_strerror(err));
	  return 0;
	}
      else {
	ao_data.buffersize = bufsize * bytes_per_sample;
	  mp_msg(MSGT_AO,MSGL_V,"alsa-init: got buffersize=%i\n", ao_data.buffersize);
      }

      if ((err = snd_pcm_hw_params_get_period_size(alsa_hwparams, &chunk_size, NULL)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetPeriodSize, snd_strerror(err));
	return 0;
      } else {
	mp_msg(MSGT_AO,MSGL_V,"alsa-init: got period size %li\n", chunk_size);
      }
      ao_data.outburst = chunk_size * bytes_per_sample;

      /* setting software parameters */
      if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetSwParameters,
	       snd_strerror(err));
	return 0;
      }
#if SND_LIB_VERSION >= 0x000901
      if ((err = snd_pcm_sw_params_get_boundary(alsa_swparams, &boundary)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetBoundary,
	       snd_strerror(err));
	return 0;
      }
#else
      boundary = 0x7fffffff;
#endif
      /* start playing when one period has been written */
      if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, chunk_size)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetStartThreshold,
	       snd_strerror(err));
	return 0;
      }
      /* disable underrun reporting */
      if ((err = snd_pcm_sw_params_set_stop_threshold(alsa_handler, alsa_swparams, boundary)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetStopThreshold,
	       snd_strerror(err));
	return 0;
      }
#if SND_LIB_VERSION >= 0x000901
      /* play silence when there is an underrun */
      if ((err = snd_pcm_sw_params_set_silence_size(alsa_handler, alsa_swparams, boundary)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToSetSilenceSize,
	       snd_strerror(err));
	return 0;
      }
#endif
      if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) {
	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetSwParameters,
	       snd_strerror(err));
	return 0;
      }
      /* end setting sw-params */

      mp_msg(MSGT_AO,MSGL_V,"alsa: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
	     ao_data.samplerate, ao_data.channels, (int)bytes_per_sample, ao_data.buffersize,
	     snd_pcm_format_description(alsa_format));

    } // end switch alsa_handler (spdif)
    alsa_can_pause = snd_pcm_hw_params_can_pause(alsa_hwparams);
    return 1;
} // end init
Exemplo n.º 10
0
int main(int argc, char **argv){
   int i;
   int aver,val,val2;
   int16_t buf[BUFSIZE];
   double d_buffer[BUFSIZE];
   double pitch = 0.0;
   struct timespec before,after;
   struct pitch_tracker_params *settings;
   snd_pcm_uframes_t period_size = PERIOD_SIZE;

   //ALSA PCM configuration
   snd_pcm_t *handle;
   snd_pcm_hw_params_t *params;
   int dir,rc;
   snd_pcm_uframes_t frames;

   /* Open PCM device for capture */
   rc = snd_pcm_open( &handle, "default" , SND_PCM_STREAM_CAPTURE , 0);

   if(rc < 0 ){
      fprintf(stderr,"unable to open pcm device: %s\n",snd_strerror(rc));
      exit(1);
   }

   /* Allocate a hardware parameters object. */
   snd_pcm_hw_params_alloca(&params);

   /* Fill it in with default values. */
   snd_pcm_hw_params_any(handle, params);

   /* Set the desired hardware parameters. */

   /* Interleaved mode */
   snd_pcm_hw_params_set_access(handle, params,SND_PCM_ACCESS_RW_INTERLEAVED);

   /* unsigned 16-bit format */
   snd_pcm_hw_params_set_format(handle, params,SND_PCM_FORMAT_S16);

   snd_pcm_hw_params_set_channels(handle, params, 1);

   /* 44100 bits/second sampling rate */
   val = 44100;
   snd_pcm_hw_params_set_rate_near(handle,params, &val, &dir);

   /* set size time*/
   snd_pcm_hw_params_set_period_size_near(handle, params, &period_size , &dir);

   /* write configuration */
   rc = snd_pcm_hw_params(handle,params);


   /*Display info*/

   printf("PCM handle name = '%s'\n",
         snd_pcm_name(handle));

   printf("PCM state = %s\n",
         snd_pcm_state_name(snd_pcm_state(handle)));

   snd_pcm_hw_params_get_access(params,
         (snd_pcm_access_t *) &val);
   printf("access type = %s\n",
         snd_pcm_access_name((snd_pcm_access_t)val));

   snd_pcm_hw_params_get_format(params, &val);
   printf("format = '%s' (%s)\n",
         snd_pcm_format_name((snd_pcm_format_t)val),
         snd_pcm_format_description(
            (snd_pcm_format_t)val));

   snd_pcm_hw_params_get_subformat(params,
         (snd_pcm_subformat_t *)&val);
   printf("subformat = '%s' (%s)\n",
         snd_pcm_subformat_name((snd_pcm_subformat_t)val),
         snd_pcm_subformat_description(
            (snd_pcm_subformat_t)val));

   snd_pcm_hw_params_get_channels(params, &val);
   printf("channels = %d\n", val);

   snd_pcm_hw_params_get_rate(params, &val, &dir);
   printf("rate = %d bps\n", val);

   snd_pcm_hw_params_get_period_time(params,
         &val, &dir);
   printf("period time = %d us\n", val);

   snd_pcm_hw_params_get_period_size(params,
         &frames, &dir);
   printf("period size = %d frames\n", (int)frames);

   snd_pcm_hw_params_get_buffer_time(params,
         &val, &dir);
   printf("buffer time = %d us\n", val);

   snd_pcm_hw_params_get_buffer_size(params,
         (snd_pcm_uframes_t *) &val);
   printf("buffer size = %d frames\n", val);

   snd_pcm_hw_params_get_periods(params, &val, &dir);
   printf("periods per buffer = %d frames\n", val);

   snd_pcm_hw_params_get_rate_numden(params,
         &val, &val2);
   printf("exact rate = %d/%d bps\n", val, val2);

   val = snd_pcm_hw_params_get_sbits(params);
   printf("significant bits = %d\n", val);

   val = snd_pcm_hw_params_is_batch(params);
   printf("is batch = %d\n", val);

   val = snd_pcm_hw_params_is_block_transfer(params);
   printf("is block transfer = %d\n", val);

   val = snd_pcm_hw_params_is_double(params);
   printf("is double = %d\n", val);

   val = snd_pcm_hw_params_is_half_duplex(params);
   printf("is half duplex = %d\n", val);

   val = snd_pcm_hw_params_is_joint_duplex(params);
   printf("is joint duplex = %d\n", val);

   val = snd_pcm_hw_params_can_overrange(params);
   printf("can overrange = %d\n", val);

   val = snd_pcm_hw_params_can_mmap_sample_resolution(params);
   printf("can mmap = %d\n", val);

   val = snd_pcm_hw_params_can_pause(params);
   printf("can pause = %d\n", val);

   val = snd_pcm_hw_params_can_resume(params);
   printf("can resume = %d\n", val);

   val = snd_pcm_hw_params_can_sync_start(params);
   printf("can sync start = %d\n", val);

   settings = open_pitch_tracker();

   while(1){
      rc = snd_pcm_readi(handle, buf, frames);
      if (rc == -EPIPE) {
         /* EPIPE means overrun */
         fprintf(stderr, "overrun occurred\n");
         snd_pcm_prepare(handle);
      } else if (rc < 0) {
         fprintf(stderr,
               "error from read: %s\n",
               snd_strerror(rc));
      } else if (rc != (int)frames) {
         fprintf(stderr, "short read, read %d frames\n", rc);
      }


      for( i = 0 ; i< BUFSIZE ; i++){
         d_buffer[i] = (double) buf[i];
      }
      pitch = compute_pitch(d_buffer, BUFSIZE, S16, settings ,ACCURACY);
      if( pitch != 0.0 )
         printf("frequency -> %f\n",pitch);

      memset(buf,0,BUFSIZE);
   }


   close_pitch_tracker(&settings);
   snd_pcm_drain(handle);
   snd_pcm_close(handle);

   return 0;
}
Exemplo n.º 11
0
bool QAudioInputPrivate::open( QObject *input )
{
    // Open the Alsa capture device.
    bool    rc = true;
    int     err;

    unsigned int        freakuency = frequency;

    if ((err = snd_pcm_open(&handle,
                             m_device.constData(), //"plughw:0,0"
                             SND_PCM_STREAM_CAPTURE,
                                 0/*SND_PCM_ASYNC*/)) < 0) {

        qWarning( "QAudioInput: snd_pcm_open: error %d", err);

        rc = false;
    }
    else {
        snd_pcm_hw_params_t *hwparams;

        // We want non-blocking mode.
        snd_pcm_nonblock(handle, 1);

        // Set the desired parameters.
        snd_pcm_hw_params_alloca(&hwparams);

        err = snd_pcm_hw_params_any(handle, hwparams);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params_any: err %d", err);
        }

        err = snd_pcm_hw_params_set_access(handle, hwparams,
                                           access);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params_set_access: err %d",err);
        }

        err = snd_pcm_hw_params_set_format(handle, hwparams,format);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params_set_format: err %d",err);
        }

        err = snd_pcm_hw_params_set_channels(handle,hwparams,(unsigned int)channels);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params_set_channels: err %d",err);
        }

        err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &freakuency, 0);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params_set_rate_near: err %d",err);
        }
        if(freakuency > 1.05 * frequency || freakuency < 0.95 * frequency) {
            qWarning("QAudioInput: warning, sample rate %i not supported by the hardware, using %u", frequency, freakuency);
        }

        if ( samplesPerBlock != -1 ) {
            // Set buffer and period sizes based on the supplied block size.
            sample_size = (snd_pcm_uframes_t)( samplesPerBlock * channels / 8 );
            err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &freakuency, 0);
            if ( err < 0 ) {
                qWarning( "QAudioInput: snd_pcm_hw_params_set_rate_near: err %d",err);
            }
            if(freakuency > 1.05 * frequency || freakuency < 0.95 * frequency) {
                qWarning( "QAudioInput: warning, sample rate %i not supported by the hardware, using %u", frequency, freakuency);
            }

            err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0);
            if ( err < 0 ) {
                qWarning( "QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err %d",err);
            }
            period_time = 1000000 * 256 / frequency;
            err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0);
            if ( err < 0 ) {
                qWarning( "QAudioInput: snd_pcm_hw_params_set_period_time_near: err %d",err);
            }
        } else {
            // Use the largest buffer and period sizes we can.
            err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0);
            if ( err < 0 ) {
                qWarning( "QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err %d",err);
            }
            period_time = 1000000 * 256 / frequency;
            err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0);
            if ( err < 0 ) {
                qWarning( "QAudioInput: snd_pcm_hw_params_set_period_time_near: err %d",err);
            }
       }

        err = snd_pcm_hw_params(handle, hwparams);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_hw_params: err %d",err);
        }

        int                  dir;
        unsigned int         vval, vval2;
        snd_pcm_access_t     aval;
        snd_pcm_format_t     fval;
        snd_pcm_subformat_t  sval;

        qLog(QAudioInput) << "PCM handle name = " << snd_pcm_name(handle);
        qLog(QAudioInput) << "PCM state = " << snd_pcm_state_name(snd_pcm_state(handle));

        snd_pcm_hw_params_get_access(hwparams,&aval);
        vval = (unsigned int)aval;
        if ( (int)vval != (int)access ) {
            qLog(QAudioInput) << QString("access type not set, want %1 got %2")
                       .arg(snd_pcm_access_name((snd_pcm_access_t)access))
                       .arg(snd_pcm_access_name((snd_pcm_access_t)vval));
            access = (snd_pcm_access_t)vval;
        }
        qLog(QAudioInput) << "access type = " << snd_pcm_access_name((snd_pcm_access_t)vval);

        snd_pcm_hw_params_get_format(hwparams, &fval);
        vval = (unsigned int)fval;
        if ( (int)vval != (int)format ) {
            qLog(QAudioInput) << QString("format type not set, want %1 got %2")
                       .arg(snd_pcm_format_name((snd_pcm_format_t)format))
                       .arg(snd_pcm_format_name((snd_pcm_format_t)vval));
            format = (snd_pcm_format_t)vval;
        }
        qLog(QAudioInput) << QString("format = '%1' (%2)")
            .arg(snd_pcm_format_name((snd_pcm_format_t)vval))
            .arg(snd_pcm_format_description((snd_pcm_format_t)vval))
            .toLatin1().constData();

        snd_pcm_hw_params_get_subformat(hwparams,&sval);
        vval = (unsigned int)sval;
        qLog(QAudioInput) << QString("subformat = '%1' (%2)")
            .arg(snd_pcm_subformat_name((snd_pcm_subformat_t)vval))
            .arg(snd_pcm_subformat_description((snd_pcm_subformat_t)vval))
            .toLatin1().constData();

        snd_pcm_hw_params_get_channels(hwparams, &vval);
        if ( (int)vval != (int)channels ) {
            qLog(QAudioInput) << QString("channels type not set, want %1 got %2").arg(channels).arg(vval);
            channels = vval;
        }
        qLog(QAudioInput) << "channels = " << vval;

        snd_pcm_hw_params_get_rate(hwparams, &vval, &dir);
        if ( (int)vval != (int)frequency ) {
            qLog(QAudioInput) << QString("frequency type not set, want %1 got %2").arg(frequency).arg(vval);
            frequency = vval;
        }
        qLog(QAudioInput) << "rate =" <<  vval << " bps";

        snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir);
        qLog(QAudioInput) << "period time =" << period_time << " us";
        snd_pcm_hw_params_get_period_size(hwparams,&period_size, &dir);
        qLog(QAudioInput) << "period size =" << (int)period_size;
        snd_pcm_hw_params_get_buffer_time(hwparams,&buffer_time, &dir);
        qLog(QAudioInput) << "buffer time =" << buffer_time;
        snd_pcm_hw_params_get_buffer_size(hwparams,(snd_pcm_uframes_t *) &buffer_size);
        qLog(QAudioInput) << "buffer size =" << (int)buffer_size;
        snd_pcm_hw_params_get_periods(hwparams, &vval, &dir);
        qLog(QAudioInput) << "periods per buffer =" << vval;
        snd_pcm_hw_params_get_rate_numden(hwparams, &vval, &vval2);
        qLog(QAudioInput) << QString("exact rate = %1/%2 bps").arg(vval).arg(vval2).toLatin1().constData();
        vval = snd_pcm_hw_params_get_sbits(hwparams);
        qLog(QAudioInput) << "significant bits =" << vval;
        snd_pcm_hw_params_get_tick_time(hwparams,&vval, &dir);
        qLog(QAudioInput) << "tick time =" << vval;
        vval = snd_pcm_hw_params_is_batch(hwparams);
        qLog(QAudioInput) << "is batch =" << vval;
        vval = snd_pcm_hw_params_is_block_transfer(hwparams);
        qLog(QAudioInput) << "is block transfer =" << vval;
        vval = snd_pcm_hw_params_is_double(hwparams);
        qLog(QAudioInput) << "is double =" << vval;
        vval = snd_pcm_hw_params_is_half_duplex(hwparams);
        qLog(QAudioInput) << "is half duplex =" << vval;
        vval = snd_pcm_hw_params_is_joint_duplex(hwparams);
        qLog(QAudioInput) << "is joint duplex =" << vval;
        vval = snd_pcm_hw_params_can_overrange(hwparams);
        qLog(QAudioInput) << "can overrange =" << vval;
        vval = snd_pcm_hw_params_can_mmap_sample_resolution(hwparams);
        qLog(QAudioInput) << "can mmap =" << vval;
        vval = snd_pcm_hw_params_can_pause(hwparams);
        qLog(QAudioInput) << "can pause =" << vval;
        vval = snd_pcm_hw_params_can_resume(hwparams);
        qLog(QAudioInput) << "can resume =" << vval;
        vval = snd_pcm_hw_params_can_sync_start(hwparams);
        qLog(QAudioInput) << "can sync start =" << vval;

        snd_pcm_sw_params_t *swparams;
        snd_pcm_sw_params_alloca(&swparams);
        err = snd_pcm_sw_params_current(handle, swparams);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_sw_params_current: err %d",err);
        }
        err = snd_pcm_sw_params_set_start_threshold(handle,swparams,period_size);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_sw_params_set_start_threshold: err %d",err);
        }
        err = snd_pcm_sw_params_set_avail_min(handle, swparams,period_size);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_sw_params_set_avail_min: err %d",err);
        }
        err = snd_pcm_sw_params_set_xfer_align(handle, swparams, 1);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_sw_params_set_xfer_align: err %d",err);
        }
        err = snd_pcm_sw_params(handle, swparams);
        if ( err < 0 ) {
            qWarning( "QAudioInput: snd_pcm_sw_params: err %d",err);
        }

        snd_pcm_prepare(handle);
        snd_pcm_start(handle);

        int     count = snd_pcm_poll_descriptors_count(handle);
        pollfd  *pfds = new pollfd[count];

        snd_pcm_poll_descriptors(handle, pfds, count);

        for (int i = 0; i < count; ++i)
        {
            if ((pfds[i].events & POLLIN) != 0) {
                notifier = new QSocketNotifier(pfds[i].fd, QSocketNotifier::Read);
                QObject::connect(notifier,
                                 SIGNAL(activated(int)),
                                 input,
                                 SIGNAL(readyRead()));

                break;
            }
        }

        if (notifier == NULL) {
            rc = false;
        }

        delete pfds;
    }

    return rc;
}
Exemplo n.º 12
0
static SCM open_card(SCM device) {
	// soundcard acquisition and configuration
	char *dname;
	snd_pcm_t *handle;
	ALSA_CARD *card;
	snd_pcm_sw_params_t *sparams;
	SOURCE_HANDLE *src;
	snd_pcm_format_t f, format;
	SCM smob;
	int i, ret, dir;
	unsigned int rate, buffer_time;
	dname = scm_to_locale_string(device);
	for (i = 0; i < 10; i++) {
		ret = snd_pcm_open(&handle, dname, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
		if (ret >= 0) break;
		}
	if (ret < 0) {
		log_msg("ALSA: can't open %s (%s)\n", dname, snd_strerror(ret));
		free(dname);
		return SCM_BOOL_F;
		}
	card = (ALSA_CARD *)my_malloc(sizeof(ALSA_CARD), "alsa card");
	card->device = dname;
	card->name = card_name(card->device);
	card->ringbuf = NULL;
	init_source(&card->base);
	card->handle = handle;
	card->running = 0;
	snd_pcm_hw_params_malloc(&card->hparams);
	snd_pcm_hw_params_any(card->handle, card->hparams);
	for (f = format = 0; f < SND_PCM_FORMAT_LAST; f++) {
		ret = snd_pcm_hw_params_test_format(card->handle, card->hparams, f);
		if (ret == 0) {
			log_msg("ALSA: - %s\n", snd_pcm_format_name(f));
			format = f;
			}
		}
	ret = snd_pcm_hw_params_set_access(card->handle, card->hparams,
				SND_PCM_ACCESS_RW_INTERLEAVED);
	if (ret < 0) log_msg("ALSA: access %s\n", snd_strerror(ret));
	ret = snd_pcm_hw_params_set_format(card->handle, card->hparams, format);
	log_msg("ALSA: format: %s\n", snd_pcm_format_description(format));
	if (ret < 0) log_msg("ALSA: format error %s\n", snd_strerror(ret));
	snd_pcm_hw_params_get_buffer_time_max(card->hparams, &buffer_time, 0);
	rate = sampling_rate;
	ret = snd_pcm_hw_params_set_rate(card->handle, card->hparams, rate, 0);
	log_msg("ALSA: rate %d\n", rate);
	if (ret < 0) log_msg("ALSA: rate error %s\n", snd_strerror(ret));
	snd_pcm_hw_params_set_channels(card->handle, card->hparams,
						QMX_CHANNELS);
	card->blocksize = BLOCKSIZE;
	snd_pcm_hw_params_set_period_size(card->handle, card->hparams,
					card->blocksize, 0);
	log_msg("ALSA: period %ld\n", card->blocksize);
	snd_pcm_hw_params_set_buffer_time_near(card->handle, card->hparams,
					&buffer_time, &dir);
	log_msg("ALSA: buffer time %u\n", buffer_time);
	if ((ret = snd_pcm_hw_params(card->handle, card->hparams)) < 0) {
		log_msg("ALSA: can't set hardware: %s\n", snd_strerror(ret));
		close_card(card);
		return SCM_BOOL_F;
		}
	else log_msg("ALSA: hardware configd\n");
	snd_pcm_sw_params_malloc(&sparams);
	snd_pcm_sw_params_current(card->handle, sparams);
	snd_pcm_sw_params_set_avail_min(card->handle, sparams, card->blocksize);
	snd_pcm_sw_params_set_start_threshold(card->handle, sparams, 0U);
	if ((ret = snd_pcm_sw_params(card->handle, sparams)) < 0) {
		log_msg("ALSA: can't set software: %s\n", snd_strerror(ret));
		}
	else log_msg("ALSA: software configd\n");
	snd_pcm_sw_params_free(sparams);
	card->link = cards;
	cards = card;
	src = (SOURCE_HANDLE *)my_gc_malloc(sizeof(SOURCE_HANDLE), "alsa_card",
				"alsa card handle");
	src->body = (void *)card;
	src->src = &card->base;
	log_msg("ALSA: opened %s '%s'\n", card->device, card->name);
	SCM_NEWSMOB(smob, alsa_card_tag, src);
	return smob;
	}
Exemplo n.º 13
0
bool AudioInputALSA::PrepHwParams(void)
{
    snd_pcm_hw_params_t* hwparams;
    snd_pcm_hw_params_alloca(&hwparams);
    if (AlsaBad(snd_pcm_hw_params_any(pcm_handle, hwparams),
                "failed to init hw params"))
        return false;
    snd_pcm_access_t axs = SND_PCM_ACCESS_RW_INTERLEAVED; //always?
    if (AlsaBad(snd_pcm_hw_params_set_access(pcm_handle, hwparams, axs),
                "failed to set interleaved rw io"))
        return false;
    snd_pcm_format_t format =
        (m_audio_sample_bits > 8) ? SND_PCM_FORMAT_S16 : SND_PCM_FORMAT_U8;
    if (AlsaBad(snd_pcm_hw_params_set_format(pcm_handle, hwparams, format),
                QString("failed to set sample format %1")
                .arg(snd_pcm_format_description(format))))
        return false;
    if (VERBOSE_LEVEL_CHECK(VB_AUDIO, LOG_DEBUG))
    {
        uint min_chans, max_chans;
        if(AlsaBad(snd_pcm_hw_params_get_channels_min(hwparams, &min_chans),
                   QString("unable to get min channel count")))
            min_chans = 0;
        if(AlsaBad(snd_pcm_hw_params_get_channels_max(hwparams, &max_chans),
                   QString("unable to get max channel count")))
            max_chans = 0;
        LOG(VB_AUDIO, LOG_DEBUG, LOC_DEV +
            QString("min channels %1, max channels %2, myth requests %3")
            .arg(min_chans).arg(max_chans).arg(m_audio_channels));
    }
    if (AlsaBad(snd_pcm_hw_params_set_channels(pcm_handle, hwparams,
                m_audio_channels), QString("failed to set channels to %1")
                .arg(m_audio_channels)))
    {
        return false;
    }
    if (AlsaBad(snd_pcm_hw_params_set_rate(pcm_handle, hwparams,
                                           m_audio_sample_rate, 0), QString("failed to set sample rate %1")
                .arg(m_audio_sample_rate)))
    {
        uint rate_num = 0;
        uint rate_den = 0;
        if (!AlsaBad(snd_pcm_hw_params_get_rate_numden(hwparams, &rate_num,
                     &rate_den), "snd_pcm_hw_params_get_rate_numden failed"))
            if (m_audio_sample_rate != (int)(rate_num / rate_den))
                LOG(VB_GENERAL, LOG_ERR, LOC_DEV +
                    QString("device reports sample rate as %1")
                    .arg(rate_num / rate_den));
        return false;
    }
    uint buffer_time = 64000; // 64 msec
    uint period_time = buffer_time / 4;
    if (AlsaBad(snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_time, NULL),
                "failed to set period time"))
        return false;
    if (AlsaBad(snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffer_time, NULL),
                "failed to set buffer time"))
        return false;
    if (AlsaBad(snd_pcm_hw_params_get_period_size(hwparams, &period_size, NULL),
                "failed to get period size"))
        return false;

    if (AlsaBad(snd_pcm_hw_params (pcm_handle, hwparams),
                "failed to set hwparams"))
        return false;

    myth_block_bytes = snd_pcm_frames_to_bytes(pcm_handle, period_size);
    LOG(VB_AUDIO, LOG_INFO, LOC_DEV +
        QString("channels %1, sample rate %2, buffer_time %3 msec, period "
                "size %4").arg(m_audio_channels)
        .arg(m_audio_sample_rate).arg(buffer_time / 1000.0, -1, 'f', 1)
        .arg(period_size));
    LOG(VB_AUDIO, LOG_DEBUG, LOC_DEV + QString("myth block size %1")
        .arg(myth_block_bytes));
    return true;
}
Exemplo n.º 14
0
status_t setHardwareParams(alsa_handle_t *handle)
{
    snd_pcm_hw_params_t *hardwareParams;
    status_t err;

    snd_pcm_uframes_t bufferSize = handle->bufferSize;
    unsigned int requestedRate = handle->sampleRate;
    unsigned int latency = handle->latency;

    // snd_pcm_format_description() and snd_pcm_format_name() do not perform
    // proper bounds checking.
    bool validFormat = (static_cast<int> (handle->format)
            > SND_PCM_FORMAT_UNKNOWN) && (static_cast<int> (handle->format)
            <= SND_PCM_FORMAT_LAST);
    const char *formatDesc = validFormat ? snd_pcm_format_description(
            handle->format) : "Invalid Format";
    const char *formatName = validFormat ? snd_pcm_format_name(handle->format)
            : "UNKNOWN";

    if (snd_pcm_hw_params_malloc(&hardwareParams) < 0) {
        LOG_ALWAYS_FATAL("Failed to allocate ALSA hardware parameters!");
        return NO_INIT;
    }

    err = snd_pcm_hw_params_any(handle->handle, hardwareParams);
    if (err < 0) {
        ALOGE("Unable to configure hardware: %s", snd_strerror(err));
        goto done;
    }

    // Set the interleaved read and write format.
    err = snd_pcm_hw_params_set_access(handle->handle, hardwareParams,
            SND_PCM_ACCESS_RW_INTERLEAVED);
    if (err < 0) {
        ALOGE("Unable to configure PCM read/write format: %s",
                snd_strerror(err));
        goto done;
    }

    err = snd_pcm_hw_params_set_format(handle->handle, hardwareParams,
            handle->format);
    if (err < 0) {
        ALOGE("Unable to configure PCM format %s (%s): %s",
                formatName, formatDesc, snd_strerror(err));
        goto done;
    }

    ALOGW("Set %s PCM format to %s (%s)", streamName(handle), formatName, formatDesc);

    err = snd_pcm_hw_params_set_channels(handle->handle, hardwareParams,
            handle->channels);
    if (err < 0) {
        ALOGE("Unable to set channel count to %i: %s",
                handle->channels, snd_strerror(err));
        goto done;
    }

    ALOGW("Using %i %s for %s.", handle->channels,
            handle->channels == 1 ? "channel" : "channels", streamName(handle));

    ALOGW("requestedRate=%d\n", requestedRate);
    err = snd_pcm_hw_params_set_rate_near(handle->handle, hardwareParams,
            &requestedRate, 0);
    ALOGW("returned Rate=%d, handle->rate=%d\n", requestedRate, handle->sampleRate);
    if (err < 0)
        ALOGE("Unable to set %s sample rate to %u: %s",
                streamName(handle), handle->sampleRate, snd_strerror(err));
    else if (requestedRate != handle->sampleRate)
        // Some devices have a fixed sample rate, and can not be changed.
        // This may cause resampling problems; i.e. PCM playback will be too
        // slow or fast.
        ALOGW("Requested rate (%u HZ) does not match actual rate (%u HZ)",
                handle->sampleRate, requestedRate);
    else
        ALOGI("Set %s sample rate to %u HZ", streamName(handle), requestedRate);

#ifdef DISABLE_HARWARE_RESAMPLING
    // Disable hardware re-sampling.
    err = snd_pcm_hw_params_set_rate_resample(handle->handle,
            hardwareParams,
            static_cast<int>(resample));
    if (err < 0) {
        ALOGE("Unable to %s hardware resampling: %s",
                resample ? "enable" : "disable",
                snd_strerror(err));
        goto done;
    }
#endif

    // Make sure we have at least the size we originally wanted
    err = snd_pcm_hw_params_set_buffer_size_near(handle->handle, hardwareParams,
            &bufferSize);

    if (err < 0) {
        ALOGE("Unable to set buffer size to %d:  %s",
                (int)bufferSize, snd_strerror(err));
        goto done;
    }

    // Setup buffers for latency
    err = snd_pcm_hw_params_set_buffer_time_near(handle->handle,
            hardwareParams, &latency, NULL);
    if (err < 0) {
        /* That didn't work, set the period instead */
        unsigned int periodTime = latency / 4;
        err = snd_pcm_hw_params_set_period_time_near(handle->handle,
                hardwareParams, &periodTime, NULL);
        if (err < 0) {
            ALOGE("Unable to set the period time for latency: %s", snd_strerror(err));
            goto done;
        }
        snd_pcm_uframes_t periodSize;
        err = snd_pcm_hw_params_get_period_size(hardwareParams, &periodSize,
                NULL);
        if (err < 0) {
            ALOGE("Unable to get the period size for latency: %s", snd_strerror(err));
            goto done;
        }
        bufferSize = periodSize * 4;
        if (bufferSize < handle->bufferSize) bufferSize = handle->bufferSize;
        err = snd_pcm_hw_params_set_buffer_size_near(handle->handle,
                hardwareParams, &bufferSize);
        if (err < 0) {
            ALOGE("Unable to set the buffer size for latency: %s", snd_strerror(err));
            goto done;
        }
    } else {
        // OK, we got buffer time near what we expect. See what that did for bufferSize.
        err = snd_pcm_hw_params_get_buffer_size(hardwareParams, &bufferSize);
        if (err < 0) {
            ALOGE("Unable to get the buffer size for latency: %s", snd_strerror(err));
            goto done;
        }
        // Does set_buffer_time_near change the passed value? It should.
        err = snd_pcm_hw_params_get_buffer_time(hardwareParams, &latency, NULL);
        if (err < 0) {
            ALOGE("Unable to get the buffer time for latency: %s", snd_strerror(err));
            goto done;
        }
        unsigned int periodTime = latency / 4;
        err = snd_pcm_hw_params_set_period_time_near(handle->handle,
                hardwareParams, &periodTime, NULL);
        if (err < 0) {
            ALOGE("Unable to set the period time for latency: %s", snd_strerror(err));
            goto done;
        }
    }

    ALOGI("Buffer size: %d", (int)bufferSize);
    ALOGI("Latency: %d", (int)latency);

    handle->bufferSize = bufferSize;
    handle->latency = latency;

    // Commit the hardware parameters back to the device.
    err = snd_pcm_hw_params(handle->handle, hardwareParams);
    if (err < 0) ALOGE("Unable to set hardware parameters: %s", snd_strerror(err));

    done:
    snd_pcm_hw_params_free(hardwareParams);

    return err;
}