// fmt carries the input format. Change it to the best next-possible format
// the encoder likely accepts.
static void select_encode_format(AVCodecContext *c, struct mp_audio *fmt)
{
int formats[AF_FORMAT_COUNT];
af_get_best_sample_formats(fmt->format, formats);
for (int n = 0; formats[n]; n++) {
const enum AVSampleFormat *lf = c->codec->sample_fmts;
for (int i = 0; lf && lf[i] != AV_SAMPLE_FMT_NONE; i++) {
int mpfmt = af_from_avformat(lf[i]);
if (mpfmt && mpfmt == formats[n]) {
mp_audio_set_format(fmt, mpfmt);
goto done_fmt;
}
}
}
done_fmt: ;
int rate =
af_select_best_samplerate(fmt->rate, c->codec->supported_samplerates);
if (rate > 0)
fmt->rate = rate;
struct mp_chmap_sel sel = {0};
const uint64_t *lch = c->codec->channel_layouts;
for (int n = 0; lch && lch[n]; n++) {
struct mp_chmap chmap = {0};
mp_chmap_from_lavc(&chmap, lch[n]);
mp_chmap_sel_add_map(&sel, &chmap);
}
struct mp_chmap res = fmt->channels;
mp_chmap_sel_adjust(&sel, &res);
if (!mp_chmap_is_empty(&res))
mp_audio_set_channels(fmt, &res);
}
static void select_format(struct ao *ao, AVCodec *codec)
{
int formats[AF_FORMAT_COUNT];
af_get_best_sample_formats(ao->format, formats);
for (int n = 0; formats[n]; n++) {
if (supports_format(codec, formats[n])) {
ao->format = formats[n];
break;
}
}
}
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;
}
