static av_cold int audio_read_header(AVFormatContext *s1,
AVFormatParameters *ap)
{
AlsaData *s = s1->priv_data;
AVStream *st;
int ret;
enum CodecID codec_id;
snd_pcm_sw_params_t *sw_params;
st = av_new_stream(s1, 0);
if (!st) {
av_log(s1, AV_LOG_ERROR, "Cannot add stream\n");
return AVERROR(ENOMEM);
}
codec_id = s1->audio_codec_id;
ret = ff_alsa_open(s1, SND_PCM_STREAM_CAPTURE, &s->sample_rate, s->channels,
&codec_id);
if (ret < 0) {
return AVERROR(EIO);
}
if (snd_pcm_type(s->h) != SND_PCM_TYPE_HW)
av_log(s1, AV_LOG_WARNING,
"capture with some ALSA plugins, especially dsnoop, "
"may hang.\n");
ret = snd_pcm_sw_params_malloc(&sw_params);
if (ret < 0) {
av_log(s1, AV_LOG_ERROR, "cannot allocate software parameters structure (%s)\n",
snd_strerror(ret));
goto fail;
}
snd_pcm_sw_params_current(s->h, sw_params);
snd_pcm_sw_params_set_tstamp_mode(s->h, sw_params, SND_PCM_TSTAMP_ENABLE);
ret = snd_pcm_sw_params(s->h, sw_params);
snd_pcm_sw_params_free(sw_params);
if (ret < 0) {
av_log(s1, AV_LOG_ERROR, "cannot install ALSA software parameters (%s)\n",
snd_strerror(ret));
goto fail;
}
/* take real parameters */
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = codec_id;
st->codec->sample_rate = s->sample_rate;
st->codec->channels = s->channels;
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
return 0;
fail:
snd_pcm_close(s->h);
return AVERROR(EIO);
}
bool ALSAWriter::processParams(bool *paramsCorrected)
{
const unsigned chn = getParam("chn").toUInt();
const unsigned rate = getParam("rate").toUInt();
const bool resetAudio = channels != chn || sample_rate != rate;
channels = chn;
sample_rate = rate;
if (resetAudio || err)
{
snd_pcm_hw_params_t *params;
snd_pcm_hw_params_alloca(¶ms);
close();
QString chosenDevName = devName;
if (autoFindMultichannelDevice && channels > 2)
{
bool mustAutoFind = true, forceStereo = false;
if (!snd_pcm_open(&snd, chosenDevName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0))
{
if (snd_pcm_type(snd) == SND_PCM_TYPE_HW)
{
unsigned max_chn = 0;
snd_pcm_hw_params_any(snd, params);
mustAutoFind = snd_pcm_hw_params_get_channels_max(params, &max_chn) || max_chn < channels;
}
#ifdef HAVE_CHMAP
else if (paramsCorrected)
{
snd_pcm_chmap_query_t **chmaps = snd_pcm_query_chmaps(snd);
if (chmaps)
snd_pcm_free_chmaps(chmaps);
else
forceStereo = true;
}
#endif
snd_pcm_close(snd);
snd = NULL;
}
if (mustAutoFind)
{
QString newDevName;
if (channels <= 4)
newDevName = "surround40";
else if (channels <= 6)
newDevName = "surround51";
else
newDevName = "surround71";
if (!newDevName.isEmpty() && newDevName != chosenDevName)
{
if (ALSACommon::getDevices().first.contains(newDevName))
chosenDevName = newDevName;
else if (forceStereo)
{
channels = 2;
*paramsCorrected = true;
}
}
}
}
if (!chosenDevName.isEmpty())
{
bool sndOpen = !snd_pcm_open(&snd, chosenDevName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0);
if (devName != chosenDevName)
{
if (sndOpen)
QMPlay2Core.logInfo("ALSA :: " + devName + "\" -> \"" + chosenDevName + "\"");
else
{
sndOpen = !snd_pcm_open(&snd, devName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0);
QMPlay2Core.logInfo("ALSA :: " + tr("Cannot open") + " \"" + chosenDevName + "\", " + tr("back to") + " \"" + devName + "\"");
}
}
if (sndOpen)
{
snd_pcm_hw_params_any(snd, params);
snd_pcm_format_t fmt = SND_PCM_FORMAT_UNKNOWN;
if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S32))
{
fmt = SND_PCM_FORMAT_S32;
sample_size = 4;
}
else if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S16))
{
fmt = SND_PCM_FORMAT_S16;
sample_size = 2;
}
else if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S8))
{
fmt = SND_PCM_FORMAT_S8;
sample_size = 1;
}
unsigned delay_us = round(delay * 1000000.0);
if (fmt != SND_PCM_FORMAT_UNKNOWN && set_snd_pcm_hw_params(snd, params, fmt, channels, sample_rate, delay_us))
{
bool err2 = false;
if (channels != chn || sample_rate != rate)
{
if (paramsCorrected)
*paramsCorrected = true;
else
err2 = true;
}
if (!err2)
{
err2 = snd_pcm_hw_params(snd, params);
if (err2 && paramsCorrected) //jakiś błąd, próba zmiany sample_rate
{
snd_pcm_hw_params_any(snd, params);
err2 = snd_pcm_hw_params_set_rate_resample(snd, params, false) || !set_snd_pcm_hw_params(snd, params, fmt, channels, sample_rate, delay_us) || snd_pcm_hw_params(snd, params);
if (!err2)
*paramsCorrected = true;
}
if (!err2)
{
modParam("delay", delay_us / 1000000.0);
if (paramsCorrected && *paramsCorrected)
{
modParam("chn", channels);
modParam("rate", sample_rate);
}
canPause = snd_pcm_hw_params_can_pause(params) && snd_pcm_hw_params_can_resume(params);
mustSwapChn = channels == 6 || channels == 8;
#ifdef HAVE_CHMAP
if (mustSwapChn)
{
snd_pcm_chmap_query_t **chmaps = snd_pcm_query_chmaps(snd);
if (chmaps)
{
for (int i = 0; chmaps[i]; ++i)
{
if (chmaps[i]->map.channels >= channels)
{
for (uint j = 0; j < channels; ++j)
{
mustSwapChn &= chmaps[i]->map.pos[j] == j + SND_CHMAP_FL;
if (!mustSwapChn)
break;
}
break;
}
}
snd_pcm_free_chmaps(chmaps);
}
}
#endif
return true;
}
}
}
}
}
err = true;
QMPlay2Core.logError("ALSA :: " + tr("Cannot open audio output stream"));
}
return readyWrite();
}
/**
* Allocate the memory-mapped buffer for direct sound, and set up the
* callback.
*/
static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
{
snd_pcm_t *pcm = pdbi->pcm;
snd_pcm_format_t format;
snd_pcm_uframes_t frames, ofs, avail, psize, boundary;
unsigned int channels, bits_per_sample, bits_per_frame;
int err, mmap_mode;
const snd_pcm_channel_area_t *areas;
snd_pcm_hw_params_t *hw_params = pdbi->hw_params;
snd_pcm_sw_params_t *sw_params = pdbi->sw_params;
void *buf;
mmap_mode = snd_pcm_type(pcm);
if (mmap_mode == SND_PCM_TYPE_HW)
TRACE("mmap'd buffer is a direct hardware buffer.\n");
else if (mmap_mode == SND_PCM_TYPE_DMIX)
TRACE("mmap'd buffer is an ALSA dmix buffer\n");
else
TRACE("mmap'd buffer is an ALSA type %d buffer\n", mmap_mode);
err = snd_pcm_hw_params_get_period_size(hw_params, &psize, NULL);
err = snd_pcm_hw_params_get_format(hw_params, &format);
err = snd_pcm_hw_params_get_buffer_size(hw_params, &frames);
err = snd_pcm_hw_params_get_channels(hw_params, &channels);
bits_per_sample = snd_pcm_format_physical_width(format);
bits_per_frame = bits_per_sample * channels;
if (TRACE_ON(dsalsa))
ALSA_TraceParameters(hw_params, NULL, FALSE);
TRACE("format=%s frames=%ld channels=%d bits_per_sample=%d bits_per_frame=%d\n",
snd_pcm_format_name(format), frames, channels, bits_per_sample, bits_per_frame);
pdbi->mmap_buflen_frames = frames;
pdbi->mmap_buflen_bytes = snd_pcm_frames_to_bytes( pcm, frames );
snd_pcm_sw_params_current(pcm, sw_params);
snd_pcm_sw_params_set_start_threshold(pcm, sw_params, 0);
snd_pcm_sw_params_get_boundary(sw_params, &boundary);
snd_pcm_sw_params_set_stop_threshold(pcm, sw_params, boundary);
snd_pcm_sw_params_set_silence_threshold(pcm, sw_params, boundary);
snd_pcm_sw_params_set_silence_size(pcm, sw_params, 0);
snd_pcm_sw_params_set_avail_min(pcm, sw_params, 0);
err = snd_pcm_sw_params(pcm, sw_params);
avail = snd_pcm_avail_update(pcm);
if ((snd_pcm_sframes_t)avail < 0)
{
ERR("No buffer is available: %s.\n", snd_strerror(avail));
return DSERR_GENERIC;
}
if (!pdbi->mmap)
{
buf = pdbi->mmap_buffer = HeapAlloc(GetProcessHeap(), 0, pdbi->mmap_buflen_bytes);
if (!buf)
return DSERR_OUTOFMEMORY;
snd_pcm_format_set_silence(format, buf, pdbi->mmap_buflen_frames);
pdbi->mmap_pos = 0;
}
else
{
err = snd_pcm_mmap_begin(pcm, &areas, &ofs, &avail);
if ( err < 0 )
{
ERR("Can't map sound device for direct access: %s/%d\n", snd_strerror(err), err);
return DSERR_GENERIC;
}
snd_pcm_format_set_silence(format, areas->addr, pdbi->mmap_buflen_frames);
pdbi->mmap_pos = ofs + snd_pcm_mmap_commit(pcm, ofs, 0);
pdbi->mmap_buffer = areas->addr;
}
TRACE("created mmap buffer of %ld frames (%d bytes) at %p\n",
frames, pdbi->mmap_buflen_bytes, pdbi->mmap_buffer);
return DS_OK;
}
int main(int argc, char *argv[])
{
const char *device_name = "hw";
snd_pcm_t *pcm;
snd_pcm_hw_params_t *hw_params;
unsigned int i;
unsigned int min, max;
int any_rate;
int err;
if (argc > 1)
device_name = argv[1];
err = snd_pcm_open(&pcm, device_name, SND_PCM_STREAM_CAPTURE,
SND_PCM_NONBLOCK);
if (err < 0) {
fprintf(stderr, "cannot open device '%s': %s\n", device_name,
snd_strerror(err));
return 1;
}
snd_pcm_hw_params_alloca(&hw_params);
err = snd_pcm_hw_params_any(pcm, hw_params);
if (err < 0) {
fprintf(stderr, "cannot get hardware parameters: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
printf("Device: %s (type: %s)\n", device_name,
snd_pcm_type_name(snd_pcm_type(pcm)));
printf("Access types:");
for (i = 0; i < ARRAY_SIZE(accesses); ++i) {
if (!snd_pcm_hw_params_test_access(pcm, hw_params, accesses[i]))
printf(" %s", snd_pcm_access_name(accesses[i]));
}
putchar('\n');
printf("Formats:");
for (i = 0; i < ARRAY_SIZE(formats); ++i) {
if (!snd_pcm_hw_params_test_format(pcm, hw_params, formats[i]))
printf(" %s", snd_pcm_format_name(formats[i]));
}
putchar('\n');
err = snd_pcm_hw_params_get_channels_min(hw_params, &min);
if (err < 0) {
fprintf(stderr, "cannot get minimum channels count: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
err = snd_pcm_hw_params_get_channels_max(hw_params, &max);
if (err < 0) {
fprintf(stderr, "cannot get maximum channels count: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
printf("Channels:");
for (i = min; i <= max; ++i) {
if (!snd_pcm_hw_params_test_channels(pcm, hw_params, i))
printf(" %u", i);
}
putchar('\n');
err = snd_pcm_hw_params_get_rate_min(hw_params, &min, NULL);
if (err < 0) {
fprintf(stderr, "cannot get minimum rate: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
err = snd_pcm_hw_params_get_rate_max(hw_params, &max, NULL);
if (err < 0) {
fprintf(stderr, "cannot get maximum rate: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
printf("Sample rates:");
if (min == max)
printf(" %u", min);
else if (!snd_pcm_hw_params_test_rate(pcm, hw_params, min + 1, 0))
printf(" %u-%u", min, max);
else {
any_rate = 0;
for (i = 0; i < ARRAY_SIZE(rates); ++i) {
if (!snd_pcm_hw_params_test_rate(pcm, hw_params,
rates[i], 0)) {
any_rate = 1;
printf(" %u", rates[i]);
}
}
if (!any_rate)
printf(" %u-%u", min, max);
}
putchar('\n');
err = snd_pcm_hw_params_get_period_time_min(hw_params, &min, NULL);
if (err < 0) {
fprintf(stderr, "cannot get minimum period time: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
err = snd_pcm_hw_params_get_period_time_max(hw_params, &max, NULL);
if (err < 0) {
fprintf(stderr, "cannot get maximum period time: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
printf("Interrupt interval: %u-%u us\n", min, max);
err = snd_pcm_hw_params_get_buffer_time_min(hw_params, &min, NULL);
if (err < 0) {
fprintf(stderr, "cannot get minimum buffer time: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
err = snd_pcm_hw_params_get_buffer_time_max(hw_params, &max, NULL);
if (err < 0) {
fprintf(stderr, "cannot get maximum buffer time: %s\n",
snd_strerror(err));
snd_pcm_close(pcm);
return 1;
}
printf("Buffer size: %u-%u us\n", min, max);
snd_pcm_close(pcm);
return 0;
}
