optional<int> AudioOutputDeviceAlsa::ParameterFragmentSize::RangeMaxAsInt(std::map<String,String> Parameters) {
if (!Parameters.count("CARD")) return optional<int>::nothing;
// obtain information from given sound card
String pcm_name = "hw:" + Parameters["CARD"];
snd_pcm_t* pcm_handle = NULL;
if (snd_pcm_open(&pcm_handle, pcm_name.c_str(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) return optional<int>::nothing;
snd_pcm_hw_params_t* hwparams;
snd_pcm_hw_params_alloca(&hwparams);
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) {
snd_pcm_close(pcm_handle);
return optional<int>::nothing;
}
int dir = 0;
unsigned long period_size_max;
if (snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, &dir) < 0) {
snd_pcm_close(pcm_handle);
return optional<int>::nothing;
}
snd_pcm_close(pcm_handle);
return (int) period_size_max; //FIXME: might overflow int limit
}
static snd_pcm_t * bg_alsa_open(const char * card,
gavl_audio_format_t * format,
snd_pcm_stream_t stream,
gavl_time_t buffer_time,
int * convert_4_3)
{
unsigned int i_tmp;
int dir, err;
snd_pcm_hw_params_t *hw_params = NULL;
// snd_pcm_sw_params_t *sw_params = NULL;
snd_pcm_t *ret = NULL;
snd_pcm_uframes_t buffer_size;
snd_pcm_uframes_t period_size;
snd_pcm_uframes_t period_size_min = 0;
snd_pcm_uframes_t period_size_max = 0;
snd_pcm_uframes_t buffer_size_min = 0;
snd_pcm_uframes_t buffer_size_max = 0;
/* We open in non blocking mode so our process won't hang if the card is
busy */
if((err = snd_pcm_open(&ret,
card,
stream, // SND_PCM_STREAM_PLAYBACK SND_PCM_STREAM_CAPTURE
SND_PCM_NONBLOCK // SND_PCM_ASYNC
) < 0))
{
ret = NULL;
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_open failed for device %s (%s)",
card, snd_strerror(err));
goto fail;
}
/* Now, set blocking mode */
snd_pcm_nonblock(ret, 0);
if(snd_pcm_hw_params_malloc(&hw_params) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_malloc failed");
goto fail;
}
if(snd_pcm_hw_params_any(ret, hw_params) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_any failed");
goto fail;
}
/* Interleave mode */
if(snd_pcm_hw_params_set_access(ret, hw_params,
SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_access failed");
goto fail;
}
else
format->interleave_mode = GAVL_INTERLEAVE_ALL;
/* Sample format */
switch(format->sample_format)
{
case GAVL_SAMPLE_S8:
case GAVL_SAMPLE_U8:
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S8) < 0)
// if(1)
{
/* Soundcard support no 8-bit, try 16 */
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S16) < 0)
{
/* Hopeless */
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_format failed");
goto fail;
}
else
format->sample_format = GAVL_SAMPLE_S16;
}
else
format->sample_format = GAVL_SAMPLE_S8;
break;
case GAVL_SAMPLE_S16:
case GAVL_SAMPLE_U16:
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S16) < 0)
{
/* Hopeless */
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_format failed");
goto fail;
}
else
format->sample_format = GAVL_SAMPLE_S16;
break;
case GAVL_SAMPLE_S32:
#ifndef WORDS_BIGENDIAN
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S32_LE) < 0)
#else
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S32_BE) < 0)
#endif
{
/* Soundcard supports no 32-bit, try 24
(more probably supported but needs conversion) */
#ifndef WORDS_BIGENDIAN
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S24_3LE) < 0)
#else
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S24_3BE) < 0)
#endif
{
/* No 24 bit, try 16 */
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S16) < 0)
{
/* Hopeless */
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_format failed");
goto fail;
}
else
format->sample_format = GAVL_SAMPLE_S16;
}
else
{
format->sample_format = GAVL_SAMPLE_S32;
if(convert_4_3)
*convert_4_3 = 1;
}
}
else
format->sample_format = GAVL_SAMPLE_S32;
break;
case GAVL_SAMPLE_FLOAT:
case GAVL_SAMPLE_DOUBLE:
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_FLOAT) < 0)
{
#ifndef WORDS_BIGENDIAN
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S32_LE) < 0)
#else
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S32_BE) < 0)
#endif
{
/* Soundcard supports no 32-bit, try 24
(more probably supported but needs conversion) */
#ifndef WORDS_BIGENDIAN
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S24_3LE) < 0)
#else
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S24_3BE) < 0)
#endif
{
/* No 24 bit, try 16 */
if(snd_pcm_hw_params_set_format(ret, hw_params, SND_PCM_FORMAT_S16) < 0)
{
/* Hopeless */
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_format failed");
goto fail;
}
else
format->sample_format = GAVL_SAMPLE_S16;
}
else
{
format->sample_format = GAVL_SAMPLE_S32;
if(convert_4_3)
*convert_4_3 = 1;
}
}
else
format->sample_format = GAVL_SAMPLE_S32;
}
else
format->sample_format = GAVL_SAMPLE_FLOAT;
break;
case GAVL_SAMPLE_NONE:
goto fail;
break;
}
/* Channels */
if(snd_pcm_hw_params_set_channels(ret, hw_params,
format->num_channels) < 0)
{
if(format->num_channels == 1) /* Mono doesn't work, try stereo */
{
if(snd_pcm_hw_params_set_channels(ret, hw_params,
2) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN,
"snd_pcm_hw_params_set_channels failed (Format has %d channels)",
format->num_channels);
goto fail;
}
else
{
format->num_channels = 2;
format->channel_locations[0] = GAVL_CHID_FRONT_LEFT;
format->channel_locations[1] = GAVL_CHID_FRONT_RIGHT;
}
}
else
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN,
"snd_pcm_hw_params_set_channels failed (Format has %d channels)",
format->num_channels);
goto fail;
}
}
/* Switch off driver side resampling */
#if SND_LIB_VERSION >= 0x010009
snd_pcm_hw_params_set_rate_resample(ret, hw_params, 0);
#endif
/* Samplerate */
i_tmp = format->samplerate;
if(snd_pcm_hw_params_set_rate_near(ret, hw_params,
&i_tmp,
0) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_rate_near failed");
goto fail;
}
if(format->samplerate != i_tmp)
{
bg_log(BG_LOG_INFO, LOG_DOMAIN,
"Samplerate %d not supported by device %s, using %d",
format->samplerate, card, i_tmp);
}
format->samplerate = i_tmp;
dir = 0;
/* Buffer size */
snd_pcm_hw_params_get_buffer_size_min(hw_params, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size_max);
dir=0;
snd_pcm_hw_params_get_period_size_min(hw_params, &period_size_min,&dir);
dir=0;
snd_pcm_hw_params_get_period_size_max(hw_params, &period_size_max,&dir);
buffer_size = gavl_time_to_samples(format->samplerate, buffer_time);
if(buffer_size > buffer_size_max)
buffer_size = buffer_size_max;
if(buffer_size < buffer_size_min)
buffer_size = buffer_size_min;
period_size = buffer_size / 8;
buffer_size = period_size * 8;
dir = 0;
if(snd_pcm_hw_params_set_period_size_near(ret, hw_params, &period_size, &dir) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_period_size failed");
goto fail;
}
dir = 0;
snd_pcm_hw_params_get_period_size(hw_params, &period_size, &dir);
dir = 0;
if(snd_pcm_hw_params_set_buffer_size_near(ret, hw_params, &buffer_size) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params_set_buffer_size failed");
goto fail;
}
snd_pcm_hw_params_get_buffer_size(hw_params, &buffer_size);
format->samples_per_frame = period_size;
/* Write params to card */
if(snd_pcm_hw_params (ret, hw_params) < 0)
{
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "snd_pcm_hw_params failed");
goto fail;
}
snd_pcm_hw_params_free(hw_params);
gavl_set_channel_setup(format);
// gavl_audio_format_dump(format);
return ret;
fail:
bg_log(BG_LOG_ERROR, LOG_DOMAIN, "Alsa initialization failed");
if(ret)
snd_pcm_close(ret);
if(hw_params)
snd_pcm_hw_params_free(hw_params);
return NULL;
}
bool CAESinkALSA::InitializeHW(AEAudioFormat &format)
{
snd_pcm_hw_params_t *hw_params;
snd_pcm_hw_params_alloca(&hw_params);
memset(hw_params, 0, snd_pcm_hw_params_sizeof());
snd_pcm_hw_params_any(m_pcm, hw_params);
snd_pcm_hw_params_set_access(m_pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
unsigned int sampleRate = format.m_sampleRate;
unsigned int channelCount = format.m_channelLayout.Count();
snd_pcm_hw_params_set_rate_near (m_pcm, hw_params, &sampleRate, NULL);
snd_pcm_hw_params_set_channels_near(m_pcm, hw_params, &channelCount);
/* ensure we opened X channels or more */
if (format.m_channelLayout.Count() > channelCount)
{
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Unable to open the required number of channels");
}
/* update the channelLayout to what we managed to open */
format.m_channelLayout.Reset();
for (unsigned int i = 0; i < channelCount; ++i)
format.m_channelLayout += ALSAChannelMap[i];
snd_pcm_format_t fmt = AEFormatToALSAFormat(format.m_dataFormat);
if (fmt == SND_PCM_FORMAT_UNKNOWN)
{
/* if we dont support the requested format, fallback to float */
format.m_dataFormat = AE_FMT_FLOAT;
fmt = SND_PCM_FORMAT_FLOAT;
}
/* try the data format */
if (snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0)
{
/* if the chosen format is not supported, try each one in decending order */
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Your hardware does not support %s, trying other formats", CAEUtil::DataFormatToStr(format.m_dataFormat));
for (enum AEDataFormat i = AE_FMT_MAX; i > AE_FMT_INVALID; i = (enum AEDataFormat)((int)i - 1))
{
if (AE_IS_RAW(i) || i == AE_FMT_MAX)
continue;
if (m_passthrough && i != AE_FMT_S16BE && i != AE_FMT_S16LE)
continue;
fmt = AEFormatToALSAFormat(i);
if (fmt == SND_PCM_FORMAT_UNKNOWN || snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0)
{
fmt = SND_PCM_FORMAT_UNKNOWN;
continue;
}
int fmtBits = CAEUtil::DataFormatToBits(i);
int bits = snd_pcm_hw_params_get_sbits(hw_params);
if (bits != fmtBits)
{
/* if we opened in 32bit and only have 24bits, pack into 24 */
if (fmtBits == 32 && bits == 24)
i = AE_FMT_S24NE4;
else
continue;
}
/* record that the format fell back to X */
format.m_dataFormat = i;
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Using data format %s", CAEUtil::DataFormatToStr(format.m_dataFormat));
break;
}
/* if we failed to find a valid output format */
if (fmt == SND_PCM_FORMAT_UNKNOWN)
{
CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Unable to find a suitable output format");
return false;
}
}
snd_pcm_uframes_t periodSize, bufferSize;
snd_pcm_hw_params_get_buffer_size_max(hw_params, &bufferSize);
snd_pcm_hw_params_get_period_size_max(hw_params, &periodSize, NULL);
/*
We want to make sure, that we have max 200 ms Buffer with
a periodSize of approx 50 ms. Choosing a higher bufferSize
will cause problems with menu sounds. Buffer will be increased
after those are fixed.
*/
periodSize = std::min(periodSize, (snd_pcm_uframes_t) sampleRate / 20);
bufferSize = std::min(bufferSize, (snd_pcm_uframes_t) sampleRate / 5);
/*
According to upstream we should set buffer size first - so make sure it is always at least
4x period size to not get underruns (some systems seem to have issues with only 2 periods)
*/
periodSize = std::min(periodSize, bufferSize / 4);
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: periodSize %lu, bufferSize %lu", periodSize, bufferSize);
snd_pcm_hw_params_t *hw_params_copy;
snd_pcm_hw_params_alloca(&hw_params_copy);
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // copy what we have and is already working
// Make sure to not initialize too large to not cause underruns
snd_pcm_uframes_t periodSizeMax = bufferSize / 3;
if(snd_pcm_hw_params_set_period_size_max(m_pcm, hw_params_copy, &periodSizeMax, NULL) != 0)
{
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: Failed to limit periodSize to %lu", periodSizeMax);
}
// first trying bufferSize, PeriodSize
// for more info see here:
// http://mailman.alsa-project.org/pipermail/alsa-devel/2009-September/021069.html
// the last three tries are done as within pulseaudio
// backup periodSize and bufferSize first. Restore them after every failed try
snd_pcm_uframes_t periodSizeTemp, bufferSizeTemp;
periodSizeTemp = periodSize;
bufferSizeTemp = bufferSize;
if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
bufferSize = bufferSizeTemp;
periodSize = periodSizeTemp;
// retry with PeriodSize, bufferSize
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
if (snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// try only periodSize
periodSize = periodSizeTemp;
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
if(snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// try only BufferSize
bufferSize = bufferSizeTemp;
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restory working copy
if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// set default that Alsa would choose
CLog::Log(LOGWARNING, "CAESinkAlsa::IntializeHW - Using default alsa values - set failed");
if (snd_pcm_hw_params(m_pcm, hw_params) != 0)
{
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Could not init a valid sink");
return false;
}
}
}
// reread values when alsa default was kept
snd_pcm_get_params(m_pcm, &bufferSize, &periodSize);
}
}
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Got: periodSize %lu, bufferSize %lu", periodSize, bufferSize);
/* set the format parameters */
format.m_sampleRate = sampleRate;
format.m_frames = periodSize;
format.m_frameSamples = periodSize * format.m_channelLayout.Count();
format.m_frameSize = snd_pcm_frames_to_bytes(m_pcm, 1);
m_bufferSize = (unsigned int)bufferSize;
m_timeout = std::ceil((double)(bufferSize * 1000) / (double)sampleRate);
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Setting timeout to %d ms", m_timeout);
return true;
}
static snd_pcm_t *alsa_open(char *dev, int rate, int channels)
{
snd_pcm_hw_params_t *hwp;
snd_pcm_sw_params_t *swp;
snd_pcm_t *h;
int r;
int dir;
snd_pcm_uframes_t period_size_min;
snd_pcm_uframes_t period_size_max;
snd_pcm_uframes_t buffer_size_min;
snd_pcm_uframes_t buffer_size_max;
snd_pcm_uframes_t period_size;
snd_pcm_uframes_t buffer_size;
if ((r = snd_pcm_open(&h, dev, SND_PCM_STREAM_PLAYBACK, 0) < 0))
return NULL;
hwp = alloca(snd_pcm_hw_params_sizeof());
memset(hwp, 0, snd_pcm_hw_params_sizeof());
snd_pcm_hw_params_any(h, hwp);
snd_pcm_hw_params_set_access(h, hwp, SND_PCM_ACCESS_RW_INTERLEAVED);
snd_pcm_hw_params_set_format(h, hwp, SND_PCM_FORMAT_S16_LE);
snd_pcm_hw_params_set_rate(h, hwp, rate, 0);
snd_pcm_hw_params_set_channels(h, hwp, channels);
/* Configurue period */
dir = 0;
snd_pcm_hw_params_get_period_size_min(hwp, &period_size_min, &dir);
dir = 0;
snd_pcm_hw_params_get_period_size_max(hwp, &period_size_max, &dir);
period_size = 1024;
dir = 0;
r = snd_pcm_hw_params_set_period_size_near(h, hwp, &period_size, &dir);
if (r < 0) {
fprintf(stderr, "audio: Unable to set period size %lu (%s)\n",
period_size, snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
dir = 0;
r = snd_pcm_hw_params_get_period_size(hwp, &period_size, &dir);
if (r < 0) {
fprintf(stderr, "audio: Unable to get period size (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
/* Configurue buffer size */
snd_pcm_hw_params_get_buffer_size_min(hwp, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hwp, &buffer_size_max);
buffer_size = period_size * 4;
dir = 0;
r = snd_pcm_hw_params_set_buffer_size_near(h, hwp, &buffer_size);
if (r < 0) {
fprintf(stderr, "audio: Unable to set buffer size %lu (%s)\n",
buffer_size, snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
r = snd_pcm_hw_params_get_buffer_size(hwp, &buffer_size);
if (r < 0) {
fprintf(stderr, "audio: Unable to get buffer size (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
/* write the hw params */
r = snd_pcm_hw_params(h, hwp);
if (r < 0) {
fprintf(stderr, "audio: Unable to configure hardware parameters (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
/*
* Software parameters
*/
swp = alloca(snd_pcm_sw_params_sizeof());
memset(hwp, 0, snd_pcm_sw_params_sizeof());
snd_pcm_sw_params_current(h, swp);
r = snd_pcm_sw_params_set_avail_min(h, swp, period_size);
if (r < 0) {
fprintf(stderr, "audio: Unable to configure wakeup threshold (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
snd_pcm_sw_params_set_start_threshold(h, swp, 0);
if (r < 0) {
fprintf(stderr, "audio: Unable to configure start threshold (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
r = snd_pcm_sw_params(h, swp);
if (r < 0) {
fprintf(stderr, "audio: Cannot set soft parameters (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
r = snd_pcm_prepare(h);
if (r < 0) {
fprintf(stderr, "audio: Cannot prepare audio for playback (%s)\n",
snd_strerror(r));
snd_pcm_close(h);
return NULL;
}
return h;
}
static void
check_period_sizes (alsa_driver *d)
{
/* Almost everything (luckily except sampling frequency) can affect period size: buffer size,
format, channel numbers... So we need to recheck it after at least one of the parameters is
changed -- mutab0r */
gint err;
guint address = PARAMS_TO_ADDRESS(d);
/* The procedure is time-consuming and may cause audio system lock. So be sure if we really
need it before starting... -- mutab0r */
if(d->bits == 0)
return;
if((address == d->address_old) && (d->buffer_size == d->bufsize_old))
return;
if(pcm_open_and_load_hwparams(d) < 0)
return;
if((err = snd_pcm_hw_params_set_format(d->soundfd, d->hwparams,
(d->bits - 8) ? d->signedness16 ? SND_PCM_FORMAT_S16 : SND_PCM_FORMAT_U16 :
d->signedness8 ? SND_PCM_FORMAT_S8 : SND_PCM_FORMAT_U8)) < 0) {
alsa_error(N_("Unable to set audio format"), err);
snd_pcm_close(d->soundfd);
return;
}
if((err = snd_pcm_hw_params_set_channels(d->soundfd, d->hwparams, d->stereo + 1)) < 0) {
alsa_error(N_("Unable to set channels number"), err);
snd_pcm_close(d->soundfd);
return;
}
if(snd_pcm_hw_params_set_buffer_size(d->soundfd, d->hwparams, 1 << d->buffer_size) < 0) {
/* Some soundcards report wrong maximal buffer size (maybe alsa bug). So we should try
to downscale its value before the reporting an error. The spinbutton still may display
the wrong number, but actually the correct value will be implemented.*/
while((--d->buffer_size) >= 8)
if(!snd_pcm_hw_params_set_buffer_size(d->soundfd, d->hwparams, 1 << d->buffer_size))
break;
if(d->buffer_size < 8) {
error_error(N_("Unable to set appropriate buffer size"));
snd_pcm_close(d->soundfd);
return;
}
}
snd_pcm_close(d->soundfd);
if ((err = snd_pcm_hw_params_get_period_size_min(d->hwparams, &(d->persizemin), 0)) < 0) {
alsa_error(N_("Unable to get minimal period size"), err);
return;
}
if ((err = snd_pcm_hw_params_get_period_size_max(d->hwparams, &(d->persizemax), 0)) < 0) {
alsa_error(N_("Unable to get maximal period size"), err);
return;
}
update_periods_range(d);
update_estimate(d);
d->address_old = address;
d->bufsize_old = d->buffer_size;
}
void info(char *dev_name, snd_pcm_stream_t stream) {
snd_pcm_hw_params_t *hw_params;
int err;
snd_pcm_t *handle;
unsigned int max;
unsigned int min;
unsigned int val;
unsigned int dir;
snd_pcm_uframes_t frames;
if ((err = snd_pcm_open (&handle, dev_name, stream, 0)) < 0) {
fprintf (stderr, "cannot open audio device %s (%s)\n",
dev_name,
snd_strerror (err));
return;
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_any (handle, hw_params)) < 0) {
fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_get_channels_max(hw_params, &max)) < 0) {
fprintf (stderr, "cannot (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max channels %d\n", max);
if ((err = snd_pcm_hw_params_get_channels_min(hw_params, &min)) < 0) {
fprintf (stderr, "cannot get channel info (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min channels %d\n", min);
/*
if ((err = snd_pcm_hw_params_get_sbits(hw_params)) < 0) {
fprintf (stderr, "cannot get bits info (%s)\n",
snd_strerror (err));
exit (1);
}
printf("bits %d\n", err);
*/
if ((err = snd_pcm_hw_params_get_rate_min(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get min rate (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min rate %d hz\n", val);
if ((err = snd_pcm_hw_params_get_rate_max(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get max rate (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max rate %d hz\n", val);
if ((err = snd_pcm_hw_params_get_period_time_min(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get min period time (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min period time %d usecs\n", val);
if ((err = snd_pcm_hw_params_get_period_time_max(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get max period time (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max period time %d usecs\n", val);
if ((err = snd_pcm_hw_params_get_period_size_min(hw_params, &frames, &dir)) < 0) {
fprintf (stderr, "cannot get min period size (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min period size in frames %d\n", frames);
if ((err = snd_pcm_hw_params_get_period_size_max(hw_params, &frames, &dir)) < 0) {
fprintf (stderr, "cannot get max period size (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max period size in frames %d\n", frames);
if ((err = snd_pcm_hw_params_get_periods_min(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get min periods (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min periods per buffer %d\n", val);
if ((err = snd_pcm_hw_params_get_periods_max(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get min periods (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max periods per buffer %d\n", val);
if ((err = snd_pcm_hw_params_get_buffer_time_min(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get min buffer time (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min buffer time %d usecs\n", val);
if ((err = snd_pcm_hw_params_get_buffer_time_max(hw_params, &val, &dir)) < 0) {
fprintf (stderr, "cannot get max buffer time (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max buffer time %d usecs\n", val);
if ((err = snd_pcm_hw_params_get_buffer_size_min(hw_params, &frames)) < 0) {
fprintf (stderr, "cannot get min buffer size (%s)\n",
snd_strerror (err));
exit (1);
}
printf("min buffer size in frames %d\n", frames);
if ((err = snd_pcm_hw_params_get_buffer_size_max(hw_params, &frames)) < 0) {
fprintf (stderr, "cannot get max buffer size (%s)\n",
snd_strerror (err));
exit (1);
}
printf("max buffer size in frames %d\n", frames);
}
/**************************************************************************
* ALSA_TraceParameters [internal]
*
* used to trace format changes, hw and sw parameters
*/
void ALSA_TraceParameters(snd_pcm_hw_params_t * hw_params, snd_pcm_sw_params_t * sw, int full)
{
int err;
snd_pcm_format_t format;
snd_pcm_access_t access;
#define X(x) ((x)? "true" : "false")
if (full)
TRACE("FLAGS: sampleres=%s overrng=%s pause=%s resume=%s syncstart=%s batch=%s block=%s double=%s "
"halfd=%s joint=%s\n",
X(snd_pcm_hw_params_can_mmap_sample_resolution(hw_params)),
X(snd_pcm_hw_params_can_overrange(hw_params)),
X(snd_pcm_hw_params_can_pause(hw_params)),
X(snd_pcm_hw_params_can_resume(hw_params)),
X(snd_pcm_hw_params_can_sync_start(hw_params)),
X(snd_pcm_hw_params_is_batch(hw_params)),
X(snd_pcm_hw_params_is_block_transfer(hw_params)),
X(snd_pcm_hw_params_is_double(hw_params)),
X(snd_pcm_hw_params_is_half_duplex(hw_params)),
X(snd_pcm_hw_params_is_joint_duplex(hw_params)));
#undef X
err = snd_pcm_hw_params_get_access(hw_params, &access);
if (err >= 0)
{
TRACE("access=%s\n", snd_pcm_access_name(access));
}
else
{
snd_pcm_access_mask_t * acmask;
acmask = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_access_mask_sizeof());
snd_pcm_hw_params_get_access_mask(hw_params, acmask);
for ( access = SND_PCM_ACCESS_MMAP_INTERLEAVED; access <= SND_PCM_ACCESS_LAST; access++)
if (snd_pcm_access_mask_test(acmask, access))
TRACE("access=%s\n", snd_pcm_access_name(access));
HeapFree( GetProcessHeap(), 0, acmask );
}
err = snd_pcm_hw_params_get_format(hw_params, &format);
if (err >= 0)
{
TRACE("format=%s\n", snd_pcm_format_name(format));
}
else
{
snd_pcm_format_mask_t * fmask;
fmask = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_format_mask_sizeof());
snd_pcm_hw_params_get_format_mask(hw_params, fmask);
for ( format = SND_PCM_FORMAT_S8; format <= SND_PCM_FORMAT_LAST ; format++)
if ( snd_pcm_format_mask_test(fmask, format) )
TRACE("format=%s\n", snd_pcm_format_name(format));
HeapFree( GetProcessHeap(), 0, fmask );
}
do {
int err=0;
unsigned int val=0;
err = snd_pcm_hw_params_get_channels(hw_params, &val);
if (err<0) {
unsigned int min = 0;
unsigned int max = 0;
err = snd_pcm_hw_params_get_channels_min(hw_params, &min),
err = snd_pcm_hw_params_get_channels_max(hw_params, &max);
TRACE("channels_min=%u, channels_min_max=%u\n", min, max);
} else {
TRACE("channels=%d\n", val);
}
} while(0);
do {
int err=0;
snd_pcm_uframes_t val=0;
err = snd_pcm_hw_params_get_buffer_size(hw_params, &val);
if (err<0) {
snd_pcm_uframes_t min = 0;
snd_pcm_uframes_t max = 0;
err = snd_pcm_hw_params_get_buffer_size_min(hw_params, &min),
err = snd_pcm_hw_params_get_buffer_size_max(hw_params, &max);
TRACE("buffer_size_min=%lu, buffer_size_min_max=%lu\n", min, max);
} else {
TRACE("buffer_size=%lu\n", val);
}
} while(0);
#define X(x) do { \
int err=0; \
int dir=0; \
unsigned int val=0; \
err = snd_pcm_hw_params_get_##x(hw_params,&val, &dir); \
if (err<0) { \
unsigned int min = 0; \
unsigned int max = 0; \
err = snd_pcm_hw_params_get_##x##_min(hw_params, &min, &dir); \
err = snd_pcm_hw_params_get_##x##_max(hw_params, &max, &dir); \
TRACE(#x "_min=%u " #x "_max=%u\n", min, max); \
} else \
TRACE(#x "=%d\n", val); \
} while(0)
X(rate);
X(buffer_time);
X(periods);
do {
int err=0;
int dir=0;
snd_pcm_uframes_t val=0;
err = snd_pcm_hw_params_get_period_size(hw_params, &val, &dir);
if (err<0) {
snd_pcm_uframes_t min = 0;
snd_pcm_uframes_t max = 0;
err = snd_pcm_hw_params_get_period_size_min(hw_params, &min, &dir),
err = snd_pcm_hw_params_get_period_size_max(hw_params, &max, &dir);
TRACE("period_size_min=%lu, period_size_min_max=%lu\n", min, max);
} else {
TRACE("period_size=%lu\n", val);
}
} while(0);
X(period_time);
#undef X
if (!sw)
return;
}
/**
* Set up the snd_pcm_t object which was opened by the caller. Set up
* the configured settings and the audio format.
*/
static bool
alsa_setup(struct alsa_data *ad, struct audio_format *audio_format,
GError **error)
{
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
unsigned int sample_rate = audio_format->sample_rate;
unsigned int channels = audio_format->channels;
snd_pcm_uframes_t alsa_buffer_size;
snd_pcm_uframes_t alsa_period_size;
int err;
const char *cmd = NULL;
int retry = MPD_ALSA_RETRY_NR;
unsigned int period_time, period_time_ro;
unsigned int buffer_time;
period_time_ro = period_time = ad->period_time;
configure_hw:
/* configure HW params */
snd_pcm_hw_params_alloca(&hwparams);
cmd = "snd_pcm_hw_params_any";
err = snd_pcm_hw_params_any(ad->pcm, hwparams);
if (err < 0)
goto error;
if (ad->use_mmap) {
err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
SND_PCM_ACCESS_MMAP_INTERLEAVED);
if (err < 0) {
g_warning("Cannot set mmap'ed mode on ALSA device \"%s\": %s\n",
alsa_device(ad), snd_strerror(-err));
g_warning("Falling back to direct write mode\n");
ad->use_mmap = false;
} else
ad->writei = snd_pcm_mmap_writei;
}
if (!ad->use_mmap) {
cmd = "snd_pcm_hw_params_set_access";
err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0)
goto error;
ad->writei = snd_pcm_writei;
}
err = alsa_output_setup_format(ad->pcm, hwparams, audio_format);
if (err < 0) {
g_set_error(error, alsa_output_quark(), err,
"ALSA device \"%s\" does not support format %s: %s",
alsa_device(ad),
sample_format_to_string(audio_format->format),
snd_strerror(-err));
return false;
}
err = snd_pcm_hw_params_set_channels_near(ad->pcm, hwparams,
&channels);
if (err < 0) {
g_set_error(error, alsa_output_quark(), err,
"ALSA device \"%s\" does not support %i channels: %s",
alsa_device(ad), (int)audio_format->channels,
snd_strerror(-err));
return false;
}
audio_format->channels = (int8_t)channels;
err = snd_pcm_hw_params_set_rate_near(ad->pcm, hwparams,
&sample_rate, NULL);
if (err < 0 || sample_rate == 0) {
g_set_error(error, alsa_output_quark(), err,
"ALSA device \"%s\" does not support %u Hz audio",
alsa_device(ad), audio_format->sample_rate);
return false;
}
audio_format->sample_rate = sample_rate;
snd_pcm_uframes_t buffer_size_min, buffer_size_max;
snd_pcm_hw_params_get_buffer_size_min(hwparams, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size_max);
unsigned buffer_time_min, buffer_time_max;
snd_pcm_hw_params_get_buffer_time_min(hwparams, &buffer_time_min, 0);
snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time_max, 0);
g_debug("buffer: size=%u..%u time=%u..%u",
(unsigned)buffer_size_min, (unsigned)buffer_size_max,
buffer_time_min, buffer_time_max);
snd_pcm_uframes_t period_size_min, period_size_max;
snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, 0);
snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, 0);
unsigned period_time_min, period_time_max;
snd_pcm_hw_params_get_period_time_min(hwparams, &period_time_min, 0);
snd_pcm_hw_params_get_period_time_max(hwparams, &period_time_max, 0);
g_debug("period: size=%u..%u time=%u..%u",
(unsigned)period_size_min, (unsigned)period_size_max,
period_time_min, period_time_max);
if (ad->buffer_time > 0) {
buffer_time = ad->buffer_time;
cmd = "snd_pcm_hw_params_set_buffer_time_near";
err = snd_pcm_hw_params_set_buffer_time_near(ad->pcm, hwparams,
&buffer_time, NULL);
if (err < 0)
goto error;
} else {
err = snd_pcm_hw_params_get_buffer_time(hwparams, &buffer_time,
NULL);
if (err < 0)
buffer_time = 0;
}
if (period_time_ro == 0 && buffer_time >= 10000) {
period_time_ro = period_time = buffer_time / 4;
g_debug("default period_time = buffer_time/4 = %u/4 = %u",
buffer_time, period_time);
}
if (period_time_ro > 0) {
period_time = period_time_ro;
cmd = "snd_pcm_hw_params_set_period_time_near";
err = snd_pcm_hw_params_set_period_time_near(ad->pcm, hwparams,
&period_time, NULL);
if (err < 0)
goto error;
}
cmd = "snd_pcm_hw_params";
err = snd_pcm_hw_params(ad->pcm, hwparams);
if (err == -EPIPE && --retry > 0 && period_time_ro > 0) {
period_time_ro = period_time_ro >> 1;
goto configure_hw;
} else if (err < 0)
bool AlsaLayer::alsa_set_params(snd_pcm_t *pcm_handle)
{
#define TRY(call, error) do { \
if (ALSA_CALL(call, error) < 0) \
return false; \
} while(0)
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
const unsigned SFL_ALSA_PERIOD_SIZE = 160;
const unsigned SFL_ALSA_NB_PERIOD = 8;
const unsigned SFL_ALSA_BUFFER_SIZE = SFL_ALSA_PERIOD_SIZE * SFL_ALSA_NB_PERIOD;
snd_pcm_uframes_t period_size = SFL_ALSA_PERIOD_SIZE;
snd_pcm_uframes_t buffer_size = SFL_ALSA_BUFFER_SIZE;
unsigned int periods = SFL_ALSA_NB_PERIOD;
snd_pcm_uframes_t period_size_min = 0;
snd_pcm_uframes_t period_size_max = 0;
snd_pcm_uframes_t buffer_size_min = 0;
snd_pcm_uframes_t buffer_size_max = 0;
#define HW pcm_handle, hwparams /* hardware parameters */
TRY(snd_pcm_hw_params_any(HW), "hwparams init");
TRY(snd_pcm_hw_params_set_access(HW, SND_PCM_ACCESS_RW_INTERLEAVED), "access type");
TRY(snd_pcm_hw_params_set_format(HW, SND_PCM_FORMAT_S16_LE), "sample format");
TRY(snd_pcm_hw_params_set_rate_resample(HW, 0), "hardware sample rate"); /* prevent software resampling */
TRY(snd_pcm_hw_params_set_rate_near(HW, &audioFormat_.sample_rate, nullptr), "sample rate");
// TODO: use snd_pcm_query_chmaps or similar to get hardware channel num
audioFormat_.nb_channels = 2;
TRY(snd_pcm_hw_params_set_channels_near(HW, &audioFormat_.nb_channels), "channel count");
snd_pcm_hw_params_get_buffer_size_min(hwparams, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size_max);
snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, nullptr);
snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, nullptr);
DEBUG("Buffer size range from %lu to %lu", buffer_size_min, buffer_size_max);
DEBUG("Period size range from %lu to %lu", period_size_min, period_size_max);
buffer_size = buffer_size > buffer_size_max ? buffer_size_max : buffer_size;
buffer_size = buffer_size < buffer_size_min ? buffer_size_min : buffer_size;
period_size = period_size > period_size_max ? period_size_max : period_size;
period_size = period_size < period_size_min ? period_size_min : period_size;
TRY(snd_pcm_hw_params_set_buffer_size_near(HW, &buffer_size), "Unable to set buffer size for playback");
TRY(snd_pcm_hw_params_set_period_size_near(HW, &period_size, nullptr), "Unable to set period size for playback");
TRY(snd_pcm_hw_params_set_periods_near(HW, &periods, nullptr), "Unable to set number of periods for playback");
TRY(snd_pcm_hw_params(HW), "hwparams");
snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
snd_pcm_hw_params_get_period_size(hwparams, &period_size, nullptr);
snd_pcm_hw_params_get_rate(hwparams, &audioFormat_.sample_rate, nullptr);
snd_pcm_hw_params_get_channels(hwparams, &audioFormat_.nb_channels);
DEBUG("Was set period_size = %lu", period_size);
DEBUG("Was set buffer_size = %lu", buffer_size);
if (2 * period_size > buffer_size) {
ERROR("buffer to small, could not use");
return false;
}
#undef HW
DEBUG("%s using format %s",
(snd_pcm_stream(pcm_handle) == SND_PCM_STREAM_PLAYBACK) ? "playback" : "capture",
audioFormat_.toString().c_str() );
snd_pcm_sw_params_t *swparams = NULL;
snd_pcm_sw_params_alloca(&swparams);
#define SW pcm_handle, swparams /* software parameters */
snd_pcm_sw_params_current(SW);
TRY(snd_pcm_sw_params_set_start_threshold(SW, period_size * 2), "start threshold");
TRY(snd_pcm_sw_params(SW), "sw parameters");
#undef SW
return true;
#undef TRY
}
