static void set_waveformat(WAVEFORMATEXTENSIBLE *wformat,
int format, WORD valid_bits,
DWORD samplerate, struct mp_chmap *channels)
{
wformat->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
wformat->Format.nChannels = channels->num;
wformat->Format.nSamplesPerSec = samplerate;
wformat->Format.wBitsPerSample = af_fmt_to_bytes(format) * 8;
wformat->Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
wformat->SubFormat = *format_to_subtype(format);
wformat->Samples.wValidBitsPerSample =
valid_bits ? valid_bits : wformat->Format.wBitsPerSample;
wformat->dwChannelMask = mp_chmap_to_waveext(channels);
update_waveformat_datarate(wformat);
}
static int init(struct ao *ao)
{
float position[3] = {0, 0, 0};
float direction[6] = {0, 0, -1, 0, 1, 0};
ALCdevice *dev = NULL;
ALCcontext *ctx = NULL;
ALCint freq = 0;
ALCint attribs[] = {ALC_FREQUENCY, ao->samplerate, 0, 0};
int i;
struct priv *p = ao->priv;
if (ao_data) {
MP_FATAL(ao, "Not reentrant!\n");
return -1;
}
ao_data = ao;
struct mp_chmap_sel sel = {0};
for (i = 0; speaker_pos[i].id != -1; i++)
mp_chmap_sel_add_speaker(&sel, speaker_pos[i].id);
if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
goto err_out;
struct speaker speakers[MAX_CHANS];
for (i = 0; i < ao->channels.num; i++) {
speakers[i].id = -1;
for (int n = 0; speaker_pos[n].id >= 0; n++) {
if (speaker_pos[n].id == ao->channels.speaker[i])
speakers[i] = speaker_pos[n];
}
if (speakers[i].id < 0) {
MP_FATAL(ao, "Unknown channel layout\n");
goto err_out;
}
}
char *dev_name = ao->device;
dev = alcOpenDevice(dev_name && dev_name[0] ? dev_name : NULL);
if (!dev) {
MP_FATAL(ao, "could not open device\n");
goto err_out;
}
ctx = alcCreateContext(dev, attribs);
alcMakeContextCurrent(ctx);
alListenerfv(AL_POSITION, position);
alListenerfv(AL_ORIENTATION, direction);
alGenSources(ao->channels.num, sources);
for (i = 0; i < ao->channels.num; i++) {
cur_buf[i] = 0;
unqueue_buf[i] = 0;
alGenBuffers(NUM_BUF, buffers[i]);
alSourcefv(sources[i], AL_POSITION, speakers[i].pos);
alSource3f(sources[i], AL_VELOCITY, 0, 0, 0);
}
alcGetIntegerv(dev, ALC_FREQUENCY, 1, &freq);
if (alcGetError(dev) == ALC_NO_ERROR && freq)
ao->samplerate = freq;
p->al_format = AL_FALSE;
int try_formats[AF_FORMAT_COUNT];
af_get_best_sample_formats(ao->format, try_formats);
for (int n = 0; try_formats[n]; n++) {
p->al_format = get_al_format(try_formats[n]);
if (p->al_format != AL_FALSE) {
ao->format = try_formats[n];
break;
}
}
if (p->al_format == AL_FALSE) {
MP_FATAL(ao, "Can't find appropriate sample format.\n");
uninit(ao);
goto err_out;
}
p->chunk_size = CHUNK_SAMPLES * af_fmt_to_bytes(ao->format);
return 0;
err_out:
ao_data = NULL;
return -1;
}
// open & setup audio device
static int init(struct ao *ao)
{
struct priv *ac = talloc_zero(ao, struct priv);
AVCodec *codec;
ao->priv = ac;
if (!encode_lavc_available(ao->encode_lavc_ctx)) {
MP_ERR(ao, "the option --o (output file) must be specified\n");
return -1;
}
pthread_mutex_lock(&ao->encode_lavc_ctx->lock);
if (encode_lavc_alloc_stream(ao->encode_lavc_ctx,
AVMEDIA_TYPE_AUDIO,
&ac->stream, &ac->codec) < 0) {
MP_ERR(ao, "could not get a new audio stream\n");
goto fail;
}
codec = ao->encode_lavc_ctx->ac;
int samplerate = af_select_best_samplerate(ao->samplerate,
codec->supported_samplerates);
if (samplerate > 0)
ao->samplerate = samplerate;
// TODO: Remove this redundancy with encode_lavc_alloc_stream also
// setting the time base.
// Using codec->time_bvase is deprecated, but needed for older lavf.
ac->stream->time_base.num = 1;
ac->stream->time_base.den = ao->samplerate;
ac->codec->time_base.num = 1;
ac->codec->time_base.den = ao->samplerate;
ac->codec->sample_rate = ao->samplerate;
struct mp_chmap_sel sel = {0};
mp_chmap_sel_add_any(&sel);
if (!ao_chmap_sel_adjust2(ao, &sel, &ao->channels, false))
goto fail;
mp_chmap_reorder_to_lavc(&ao->channels);
ac->codec->channels = ao->channels.num;
ac->codec->channel_layout = mp_chmap_to_lavc(&ao->channels);
ac->codec->sample_fmt = AV_SAMPLE_FMT_NONE;
select_format(ao, codec);
ac->sample_size = af_fmt_to_bytes(ao->format);
ac->codec->sample_fmt = af_to_avformat(ao->format);
ac->codec->bits_per_raw_sample = ac->sample_size * 8;
if (encode_lavc_open_codec(ao->encode_lavc_ctx, ac->codec) < 0)
goto fail;
ac->pcmhack = 0;
if (ac->codec->frame_size <= 1)
ac->pcmhack = av_get_bits_per_sample(ac->codec->codec_id) / 8;
if (ac->pcmhack)
ac->aframesize = 16384; // "enough"
else
ac->aframesize = ac->codec->frame_size;
// enough frames for at least 0.25 seconds
ac->framecount = ceil(ao->samplerate * 0.25 / ac->aframesize);
// but at least one!
ac->framecount = FFMAX(ac->framecount, 1);
ac->savepts = AV_NOPTS_VALUE;
ac->lastpts = AV_NOPTS_VALUE;
ao->untimed = true;
if (ao->channels.num > AV_NUM_DATA_POINTERS)
goto fail;
pthread_mutex_unlock(&ao->encode_lavc_ctx->lock);
return 0;
fail:
pthread_mutex_unlock(&ao->encode_lavc_ctx->lock);
ac->shutdown = true;
return -1;
}
