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mpv/player/audio.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdbool.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <assert.h>
#include "config.h"
#include "mpv_talloc.h"
#include "common/msg.h"
#include "common/encode.h"
#include "options/options.h"
#include "common/common.h"
#include "osdep/timer.h"
#include "audio/mixer.h"
#include "audio/audio.h"
#include "audio/audio_buffer.h"
#include "audio/decode/dec_audio.h"
#include "audio/filter/af.h"
#include "audio/out/ao.h"
#include "demux/demux.h"
#include "video/decode/dec_video.h"
#include "core.h"
#include "command.h"
enum {
AD_OK = 0,
AD_ERR = -1,
AD_EOF = -2,
AD_NEW_FMT = -3,
AD_WAIT = -4,
AD_NO_PROGRESS = -5,
};
// Use pitch correction only for speed adjustments by the user, not minor sync
// correction ones.
static int get_speed_method(struct MPContext *mpctx)
{
return mpctx->opts->pitch_correction && mpctx->opts->playback_speed != 1.0
? AF_CONTROL_SET_PLAYBACK_SPEED : AF_CONTROL_SET_PLAYBACK_SPEED_RESAMPLE;
}
// Try to reuse the existing filters to change playback speed. If it works,
// return true; if filter recreation is needed, return false.
static bool update_speed_filters(struct MPContext *mpctx)
{
struct af_stream *afs = mpctx->ao_chain->af;
double speed = mpctx->audio_speed;
if (afs->initialized < 1)
return false;
// Make sure only exactly one filter changes speed; resetting them all
// and setting 1 filter is the easiest way to achieve this.
af_control_all(afs, AF_CONTROL_SET_PLAYBACK_SPEED, &(double){1});
af_control_all(afs, AF_CONTROL_SET_PLAYBACK_SPEED_RESAMPLE, &(double){1});
if (speed == 1.0)
return !af_find_by_label(afs, "playback-speed");
// Compatibility: if the user uses --af=scaletempo, always use this
// filter to change speed. Don't insert a second filter (any) either.
if (!af_find_by_label(afs, "playback-speed") &&
af_control_any_rev(afs, AF_CONTROL_SET_PLAYBACK_SPEED, &speed))
return true;
return !!af_control_any_rev(afs, get_speed_method(mpctx), &speed);
}
// Update speed, and insert/remove filters if necessary.
static void recreate_speed_filters(struct MPContext *mpctx)
{
struct af_stream *afs = mpctx->ao_chain->af;
if (update_speed_filters(mpctx))
return;
if (af_remove_by_label(afs, "playback-speed") < 0)
goto fail;
if (mpctx->audio_speed == 1.0)
return;
int method = get_speed_method(mpctx);
char *filter = method == AF_CONTROL_SET_PLAYBACK_SPEED
? "scaletempo" : "lavrresample";
if (!af_add(afs, filter, "playback-speed", NULL))
goto fail;
if (!update_speed_filters(mpctx))
goto fail;
return;
fail:
mpctx->opts->playback_speed = 1.0;
mpctx->speed_factor_a = 1.0;
mpctx->audio_speed = 1.0;
mp_notify(mpctx, MP_EVENT_CHANGE_ALL, NULL);
}
static int recreate_audio_filters(struct MPContext *mpctx)
{
assert(mpctx->ao_chain);
struct af_stream *afs = mpctx->ao_chain->af;
if (afs->initialized < 1 && af_init(afs) < 0)
goto fail;
recreate_speed_filters(mpctx);
if (afs->initialized < 1 && af_init(afs) < 0)
goto fail;
mixer_reinit_audio(mpctx->mixer, mpctx->ao, afs);
mp_notify(mpctx, MPV_EVENT_AUDIO_RECONFIG, NULL);
return 0;
fail:
MP_ERR(mpctx, "Couldn't find matching filter/ao format!\n");
return -1;
}
int reinit_audio_filters(struct MPContext *mpctx)
{
struct ao_chain *ao_c = mpctx->ao_chain;
if (!ao_c)
return 0;
double delay = 0;
if (ao_c->af->initialized > 0)
delay = af_calc_delay(ao_c->af);
af_uninit(ao_c->af);
if (recreate_audio_filters(mpctx) < 0)
return -1;
// Only force refresh if the amount of dropped buffered data is going to
// cause "issues" for the A/V sync logic.
if (mpctx->audio_status == STATUS_PLAYING &&
mpctx->playback_pts != MP_NOPTS_VALUE && delay > 0.2)
{
queue_seek(mpctx, MPSEEK_ABSOLUTE, mpctx->playback_pts,
MPSEEK_EXACT, true);
}
return 1;
}
// Call this if opts->playback_speed or mpctx->speed_factor_* change.
void update_playback_speed(struct MPContext *mpctx)
{
mpctx->audio_speed = mpctx->opts->playback_speed * mpctx->speed_factor_a;
mpctx->video_speed = mpctx->opts->playback_speed * mpctx->speed_factor_v;
if (!mpctx->ao_chain || mpctx->ao_chain->af->initialized < 1)
return;
if (!update_speed_filters(mpctx))
recreate_audio_filters(mpctx);
}
static void ao_chain_reset_state(struct ao_chain *ao_c)
{
ao_c->pts = MP_NOPTS_VALUE;
ao_c->pts_reset = false;
talloc_free(ao_c->input_frame);
ao_c->input_frame = NULL;
af_seek_reset(ao_c->af);
mp_audio_buffer_clear(ao_c->ao_buffer);
if (ao_c->audio_src)
audio_reset_decoding(ao_c->audio_src);
}
void reset_audio_state(struct MPContext *mpctx)
{
if (mpctx->ao_chain)
ao_chain_reset_state(mpctx->ao_chain);
mpctx->audio_status = mpctx->ao_chain ? STATUS_SYNCING : STATUS_EOF;
mpctx->delay = 0;
mpctx->audio_drop_throttle = 0;
mpctx->audio_stat_start = 0;
}
void uninit_audio_out(struct MPContext *mpctx)
{
if (mpctx->ao) {
// Note: with gapless_audio, stop_play is not correctly set
if (mpctx->opts->gapless_audio || mpctx->stop_play == AT_END_OF_FILE)
ao_drain(mpctx->ao);
mixer_uninit_audio(mpctx->mixer);
ao_uninit(mpctx->ao);
mp_notify(mpctx, MPV_EVENT_AUDIO_RECONFIG, NULL);
}
mpctx->ao = NULL;
talloc_free(mpctx->ao_decoder_fmt);
mpctx->ao_decoder_fmt = NULL;
}
static void ao_chain_uninit(struct ao_chain *ao_c)
{
struct track *track = ao_c->track;
if (track) {
assert(track->ao_c == ao_c);
track->ao_c = NULL;
assert(track->d_audio == ao_c->audio_src);
track->d_audio = NULL;
audio_uninit(ao_c->audio_src);
}
if (ao_c->filter_src)
lavfi_set_connected(ao_c->filter_src, false);
af_destroy(ao_c->af);
talloc_free(ao_c->input_frame);
talloc_free(ao_c->ao_buffer);
talloc_free(ao_c);
}
void uninit_audio_chain(struct MPContext *mpctx)
{
if (mpctx->ao_chain) {
mixer_uninit_audio(mpctx->mixer);
ao_chain_uninit(mpctx->ao_chain);
mpctx->ao_chain = NULL;
mpctx->audio_status = STATUS_EOF;
mp_notify(mpctx, MPV_EVENT_AUDIO_RECONFIG, NULL);
}
}
static void reinit_audio_filters_and_output(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct ao_chain *ao_c = mpctx->ao_chain;
assert(ao_c);
struct track *track = ao_c->track;
struct af_stream *afs = ao_c->af;
if (ao_c->input_frame)
mp_audio_copy_config(&ao_c->input_format, ao_c->input_frame);
struct mp_audio in_format = ao_c->input_format;
if (!mp_audio_config_valid(&in_format)) {
// We don't know the audio format yet - so configure it later as we're
// resyncing. fill_audio_buffers() will call this function again.
mpctx->sleeptime = 0;
return;
}
// Weak gapless audio: drain AO on decoder format changes
if (mpctx->ao_decoder_fmt && mpctx->ao && opts->gapless_audio < 0 &&
!mp_audio_config_equals(mpctx->ao_decoder_fmt, &in_format))
{
uninit_audio_out(mpctx);
}
if (mpctx->ao && mp_audio_config_equals(&in_format, &afs->input))
return;
afs->output = (struct mp_audio){0};
if (mpctx->ao) {
ao_get_format(mpctx->ao, &afs->output);
} else if (af_fmt_is_pcm(in_format.format)) {
afs->output.rate = opts->force_srate;
mp_audio_set_format(&afs->output, opts->audio_output_format);
mp_audio_set_channels(&afs->output, &opts->audio_output_channels);
}
// filter input format: same as codec's output format:
afs->input = in_format;
// Determine what the filter chain outputs. recreate_audio_filters() also
// needs this for testing whether playback speed is changed by resampling
// or using a special filter.
if (af_init(afs) < 0) {
MP_ERR(mpctx, "Error at audio filter chain pre-init!\n");
goto init_error;
}
if (!mpctx->ao) {
bool spdif_fallback = af_fmt_is_spdif(afs->output.format) &&
ao_c->spdif_passthrough;
bool ao_null_fallback = opts->ao_null_fallback && !spdif_fallback;
mp_chmap_remove_useless_channels(&afs->output.channels,
&opts->audio_output_channels);
mp_audio_set_channels(&afs->output, &afs->output.channels);
mpctx->ao = ao_init_best(mpctx->global, ao_null_fallback, mpctx->input,
mpctx->encode_lavc_ctx, afs->output.rate,
afs->output.format, afs->output.channels);
ao_c->ao = mpctx->ao;
struct mp_audio fmt = {0};
if (mpctx->ao)
ao_get_format(mpctx->ao, &fmt);
// Verify passthrough format was not changed.
if (mpctx->ao && af_fmt_is_spdif(afs->output.format)) {
if (!mp_audio_config_equals(&afs->output, &fmt)) {
MP_ERR(mpctx, "Passthrough format unsupported.\n");
ao_uninit(mpctx->ao);
mpctx->ao = NULL;
ao_c->ao = NULL;
}
}
if (!mpctx->ao) {
// If spdif was used, try to fallback to PCM.
if (spdif_fallback && ao_c->audio_src) {
MP_VERBOSE(mpctx, "Falling back to PCM output.\n");
ao_c->spdif_passthrough = false;
ao_c->spdif_failed = true;
ao_c->audio_src->try_spdif = false;
if (!audio_init_best_codec(ao_c->audio_src))
goto init_error;
reset_audio_state(mpctx);
ao_c->input_format = (struct mp_audio){0};
mpctx->sleeptime = 0; // reinit with new format next time
return;
}
MP_ERR(mpctx, "Could not open/initialize audio device -> no sound.\n");
mpctx->error_playing = MPV_ERROR_AO_INIT_FAILED;
goto init_error;
}
mp_audio_buffer_reinit(ao_c->ao_buffer, &fmt);
afs->output = fmt;
if (!mp_audio_config_equals(&afs->output, &afs->filter_output))
afs->initialized = 0;
mpctx->ao_decoder_fmt = talloc(NULL, struct mp_audio);
*mpctx->ao_decoder_fmt = in_format;
MP_INFO(mpctx, "AO: [%s] %s\n", ao_get_name(mpctx->ao),
mp_audio_config_to_str(&fmt));
MP_VERBOSE(mpctx, "AO: Description: %s\n", ao_get_description(mpctx->ao));
update_window_title(mpctx, true);
}
if (recreate_audio_filters(mpctx) < 0)
goto init_error;
update_playback_speed(mpctx);
mp_notify(mpctx, MPV_EVENT_AUDIO_RECONFIG, NULL);
return;
init_error:
uninit_audio_chain(mpctx);
uninit_audio_out(mpctx);
error_on_track(mpctx, track);
}
int init_audio_decoder(struct MPContext *mpctx, struct track *track)
{
assert(!track->d_audio);
if (!track->stream)
goto init_error;
track->d_audio = talloc_zero(NULL, struct dec_audio);
struct dec_audio *d_audio = track->d_audio;
d_audio->log = mp_log_new(d_audio, mpctx->log, "!ad");
d_audio->global = mpctx->global;
d_audio->opts = mpctx->opts;
d_audio->header = track->stream;
d_audio->codec = track->stream->codec;
d_audio->try_spdif = true;
if (!audio_init_best_codec(d_audio))
goto init_error;
return 1;
init_error:
if (track->sink)
lavfi_set_connected(track->sink, false);
track->sink = NULL;
audio_uninit(track->d_audio);
track->d_audio = NULL;
error_on_track(mpctx, track);
return 0;
}
void reinit_audio_chain(struct MPContext *mpctx)
{
reinit_audio_chain_src(mpctx, NULL);
}
void reinit_audio_chain_src(struct MPContext *mpctx, struct lavfi_pad *src)
{
struct track *track = NULL;
struct sh_stream *sh = NULL;
if (!src) {
track = mpctx->current_track[0][STREAM_AUDIO];
if (!track)
return;
sh = track->stream;
if (!sh) {
uninit_audio_out(mpctx);
goto no_audio;
}
}
assert(!mpctx->ao_chain);
mp_notify(mpctx, MPV_EVENT_AUDIO_RECONFIG, NULL);
struct ao_chain *ao_c = talloc_zero(NULL, struct ao_chain);
mpctx->ao_chain = ao_c;
ao_c->log = mpctx->log;
ao_c->af = af_new(mpctx->global);
if (sh)
ao_c->af->replaygain_data = sh->codec->replaygain_data;
ao_c->spdif_passthrough = true;
ao_c->pts = MP_NOPTS_VALUE;
ao_c->ao_buffer = mp_audio_buffer_create(NULL);
ao_c->ao = mpctx->ao;
ao_c->filter_src = src;
if (!ao_c->filter_src) {
ao_c->track = track;
track->ao_c = ao_c;
if (!init_audio_decoder(mpctx, track))
goto init_error;
ao_c->audio_src = track->d_audio;
}
reset_audio_state(mpctx);
if (mpctx->ao) {
struct mp_audio fmt;
ao_get_format(mpctx->ao, &fmt);
mp_audio_buffer_reinit(ao_c->ao_buffer, &fmt);
}
mpctx->sleeptime = 0;
return;
init_error:
uninit_audio_chain(mpctx);
uninit_audio_out(mpctx);
no_audio:
error_on_track(mpctx, track);
}
// Return pts value corresponding to the end point of audio written to the
// ao so far.
double written_audio_pts(struct MPContext *mpctx)
{
struct ao_chain *ao_c = mpctx->ao_chain;
if (!ao_c)
return MP_NOPTS_VALUE;
struct mp_audio in_format = ao_c->input_format;
if (!mp_audio_config_valid(&in_format) || ao_c->af->initialized < 1)
return MP_NOPTS_VALUE;
// first calculate the end pts of audio that has been output by decoder
double a_pts = ao_c->pts;
if (a_pts == MP_NOPTS_VALUE)
return MP_NOPTS_VALUE;
// Data buffered in audio filters, measured in seconds of "missing" output
double buffered_output = af_calc_delay(ao_c->af);
// Data that was ready for ao but was buffered because ao didn't fully
// accept everything to internal buffers yet
buffered_output += mp_audio_buffer_seconds(ao_c->ao_buffer);
// Filters divide audio length by audio_speed, so multiply by it
// to get the length in original units without speedup or slowdown
a_pts -= buffered_output * mpctx->audio_speed;
return a_pts;
}
// Return pts value corresponding to currently playing audio.
double playing_audio_pts(struct MPContext *mpctx)
{
double pts = written_audio_pts(mpctx);
if (pts == MP_NOPTS_VALUE || !mpctx->ao)
return pts;
return pts - mpctx->audio_speed * ao_get_delay(mpctx->ao);
}
static int write_to_ao(struct MPContext *mpctx, struct mp_audio *data, int flags)
{
if (mpctx->paused)
return 0;
struct ao *ao = mpctx->ao;
struct mp_audio out_format;
ao_get_format(ao, &out_format);
#if HAVE_ENCODING
encode_lavc_set_audio_pts(mpctx->encode_lavc_ctx, playing_audio_pts(mpctx));
#endif
if (data->samples == 0)
return 0;
double real_samplerate = out_format.rate / mpctx->audio_speed;
int played = ao_play(mpctx->ao, data->planes, data->samples, flags);
assert(played <= data->samples);
if (played > 0) {
mpctx->shown_aframes += played;
mpctx->delay += played / real_samplerate;
mpctx->written_audio += played / (double)out_format.rate;
return played;
}
return 0;
}
static void dump_audio_stats(struct MPContext *mpctx)
{
if (!mp_msg_test(mpctx->log, MSGL_STATS))
return;
if (mpctx->audio_status != STATUS_PLAYING || !mpctx->ao || mpctx->paused) {
mpctx->audio_stat_start = 0;
return;
}
double delay = ao_get_delay(mpctx->ao);
if (!mpctx->audio_stat_start) {
mpctx->audio_stat_start = mp_time_us();
mpctx->written_audio = delay;
}
double current_audio = mpctx->written_audio - delay;
double current_time = (mp_time_us() - mpctx->audio_stat_start) / 1e6;
MP_STATS(mpctx, "value %f ao-dev", current_audio - current_time);
}
// Return the number of samples that must be skipped or prepended to reach the
// target audio pts after a seek (for A/V sync or hr-seek).
// Return value (*skip):
// >0: skip this many samples
// =0: don't do anything
// <0: prepend this many samples of silence
// Returns false if PTS is not known yet.
static bool get_sync_samples(struct MPContext *mpctx, int *skip)
{
struct MPOpts *opts = mpctx->opts;
*skip = 0;
if (mpctx->audio_status != STATUS_SYNCING)
return true;
struct mp_audio out_format = {0};
ao_get_format(mpctx->ao, &out_format);
double play_samplerate = out_format.rate / mpctx->audio_speed;
if (!opts->initial_audio_sync) {
mpctx->audio_status = STATUS_FILLING;
return true;
}
double written_pts = written_audio_pts(mpctx);
if (written_pts == MP_NOPTS_VALUE &&
!mp_audio_buffer_samples(mpctx->ao_chain->ao_buffer))
return false; // no audio read yet
bool sync_to_video = mpctx->vo_chain && !mpctx->vo_chain->is_coverart &&
mpctx->video_status != STATUS_EOF;
double sync_pts = MP_NOPTS_VALUE;
if (sync_to_video) {
if (mpctx->video_status < STATUS_READY)
return false; // wait until we know a video PTS
if (mpctx->video_pts != MP_NOPTS_VALUE)
sync_pts = mpctx->video_pts - opts->audio_delay;
} else if (mpctx->hrseek_active) {
sync_pts = mpctx->hrseek_pts;
}
if (sync_pts == MP_NOPTS_VALUE) {
mpctx->audio_status = STATUS_FILLING;
return true; // syncing disabled
}
double ptsdiff = written_pts - sync_pts;
// Missing timestamp, or PTS reset, or just broken.
if (written_pts == MP_NOPTS_VALUE) {
MP_WARN(mpctx, "Failed audio resync.\n");
mpctx->audio_status = STATUS_FILLING;
return true;
}
ptsdiff = MPCLAMP(ptsdiff, -3600, 3600);
int align = af_format_sample_alignment(out_format.format);
*skip = (int)(-ptsdiff * play_samplerate) / align * align;
return true;
}
static bool copy_output(struct af_stream *afs, struct mp_audio_buffer *outbuf,
int minsamples, bool eof)
{
while (mp_audio_buffer_samples(outbuf) < minsamples) {
if (af_output_frame(afs, eof) < 0)
return true; // error, stop doing stuff
struct mp_audio *mpa = af_read_output_frame(afs);
if (!mpa)
return false; // out of data
mp_audio_buffer_append(outbuf, mpa);
talloc_free(mpa);
}
return true;
}
static int decode_new_frame(struct ao_chain *ao_c)
{
if (ao_c->input_frame)
return AD_OK;
int res = DATA_EOF;
if (ao_c->filter_src) {
res = lavfi_request_frame_a(ao_c->filter_src, &ao_c->input_frame);
} else if (ao_c->audio_src) {
audio_work(ao_c->audio_src);
res = audio_get_frame(ao_c->audio_src, &ao_c->input_frame);
}
switch (res) {
case DATA_OK: return AD_OK;
case DATA_WAIT: return AD_WAIT;
case DATA_AGAIN: return AD_NO_PROGRESS;
case DATA_EOF: return AD_EOF;
default: abort();
}
}
/* Try to get at least minsamples decoded+filtered samples in outbuf
* (total length including possible existing data).
* Return 0 on success, or negative AD_* error code.
* In the former case outbuf has at least minsamples buffered on return.
* In case of EOF/error it might or might not be. */
static int filter_audio(struct ao_chain *ao_c, struct mp_audio_buffer *outbuf,
int minsamples)
{
struct af_stream *afs = ao_c->af;
if (afs->initialized < 1)
return AD_ERR;
MP_STATS(ao_c, "start audio");
int res;
while (1) {
res = 0;
if (copy_output(afs, outbuf, minsamples, false))
break;
res = decode_new_frame(ao_c);
if (res == AD_NO_PROGRESS)
break;
if (res < 0) {
// drain filters first (especially for true EOF case)
copy_output(afs, outbuf, minsamples, true);
break;
}
// On format change, make sure to drain the filter chain.
if (!mp_audio_config_equals(&afs->input, ao_c->input_frame)) {
copy_output(afs, outbuf, minsamples, true);
res = AD_NEW_FMT;
break;
}
struct mp_audio *mpa = ao_c->input_frame;
ao_c->input_frame = NULL;
if (mpa->pts == MP_NOPTS_VALUE) {
ao_c->pts = MP_NOPTS_VALUE;
} else {
// Attempt to detect jumps in PTS. Even for the lowest sample rates
// and with worst container rounded timestamp, this should be a
// margin more than enough.
double desync = fabs(mpa->pts - ao_c->pts);
if (ao_c->pts != MP_NOPTS_VALUE && desync > 0.1) {
MP_WARN(ao_c, "Invalid audio PTS: %f -> %f\n",
ao_c->pts, mpa->pts);
if (desync >= 5)
ao_c->pts_reset = true;
}
ao_c->pts = mpa->pts + mpa->samples / (double)mpa->rate;
}
if (af_filter_frame(afs, mpa) < 0)
return AD_ERR;
}
MP_STATS(ao_c, "end audio");
return res;
}
void fill_audio_out_buffers(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct ao_chain *ao_c = mpctx->ao_chain;
dump_audio_stats(mpctx);
if (mpctx->ao && ao_query_and_reset_events(mpctx->ao, AO_EVENT_RELOAD)) {
ao_reset(mpctx->ao);
uninit_audio_out(mpctx);
if (ao_c) {
struct dec_audio *d_audio = ao_c->audio_src;
if (d_audio && ao_c->spdif_failed) {
ao_c->spdif_failed = false;
d_audio->try_spdif = true;
if (!audio_init_best_codec(d_audio)) {
MP_ERR(mpctx, "Error reinitializing audio.\n");
error_on_track(mpctx, ao_c->track);
return;
}
}
mpctx->audio_status = STATUS_SYNCING;
}
}
if (!ao_c)
return;
if (ao_c->af->initialized < 1 || !mpctx->ao) {
// Probe the initial audio format. Returns AD_OK (and does nothing) if
// the format is already known.
int r = decode_new_frame(mpctx->ao_chain);
if (r == AD_WAIT)
return; // continue later when new data is available
if (r == AD_EOF) {
mpctx->audio_status = STATUS_EOF;
return;
}
reinit_audio_filters_and_output(mpctx);
mpctx->sleeptime = 0;
return; // try again next iteration
}
if (mpctx->vo_chain && ao_c->pts_reset) {
MP_VERBOSE(mpctx, "Reset playback due to audio timestamp reset.\n");
reset_playback_state(mpctx);
mpctx->sleeptime = 0;
return;
}
struct mp_audio out_format = {0};
ao_get_format(mpctx->ao, &out_format);
double play_samplerate = out_format.rate / mpctx->audio_speed;
int align = af_format_sample_alignment(out_format.format);
// If audio is infinitely fast, somehow try keeping approximate A/V sync.
if (mpctx->audio_status == STATUS_PLAYING && ao_untimed(mpctx->ao) &&
mpctx->video_status != STATUS_EOF && mpctx->delay > 0)
return;
int playsize = ao_get_space(mpctx->ao);
int skip = 0;
bool sync_known = get_sync_samples(mpctx, &skip);
if (skip > 0) {
playsize = MPMIN(skip + 1, MPMAX(playsize, 2500)); // buffer extra data
} else if (skip < 0) {
playsize = MPMAX(1, playsize + skip); // silence will be prepended
}
int skip_duplicate = 0; // >0: skip, <0: duplicate
double drop_limit =
(opts->sync_max_audio_change + opts->sync_max_video_change) / 100;
if (mpctx->display_sync_active && opts->video_sync == VS_DISP_ADROP &&
fabs(mpctx->last_av_difference) >= opts->sync_audio_drop_size &&
mpctx->audio_drop_throttle < drop_limit &&
mpctx->audio_status == STATUS_PLAYING)
{
int samples = ceil(opts->sync_audio_drop_size * play_samplerate);
samples = (samples + align / 2) / align * align;
skip_duplicate = mpctx->last_av_difference >= 0 ? -samples : samples;
playsize = MPMAX(playsize, samples);
mpctx->audio_drop_throttle += 1 - drop_limit - samples / play_samplerate;
}
playsize = playsize / align * align;
int status = AD_OK;
bool working = false;
if (playsize > mp_audio_buffer_samples(ao_c->ao_buffer)) {
status = filter_audio(mpctx->ao_chain, ao_c->ao_buffer, playsize);
if (status == AD_WAIT)
return;
if (status == AD_NO_PROGRESS) {
mpctx->sleeptime = 0;
return;
}
if (status == AD_NEW_FMT) {
/* The format change isn't handled too gracefully. A more precise
* implementation would require draining buffered old-format audio
* while displaying video, then doing the output format switch.
*/
if (mpctx->opts->gapless_audio < 1)
uninit_audio_out(mpctx);
reinit_audio_filters_and_output(mpctx);
mpctx->sleeptime = 0;
return; // retry on next iteration
}
if (status == AD_ERR)
mpctx->sleeptime = 0;
working = true;
}
// If EOF was reached before, but now something can be decoded, try to
// restart audio properly. This helps with video files where audio starts
// later. Retrying is needed to get the correct sync PTS.
if (mpctx->audio_status >= STATUS_DRAINING && status == AD_OK) {
mpctx->audio_status = STATUS_SYNCING;
return; // retry on next iteration
}
bool end_sync = false;
if (skip >= 0) {
int max = mp_audio_buffer_samples(ao_c->ao_buffer);
mp_audio_buffer_skip(ao_c->ao_buffer, MPMIN(skip, max));
// If something is left, we definitely reached the target time.
end_sync |= sync_known && skip < max;
working |= skip > 0;
} else if (skip < 0) {
if (-skip > playsize) { // heuristic against making the buffer too large
ao_reset(mpctx->ao); // some AOs repeat data on underflow
mpctx->audio_status = STATUS_DRAINING;
mpctx->delay = 0;
return;
}
mp_audio_buffer_prepend_silence(ao_c->ao_buffer, -skip);
end_sync = true;
}
if (skip_duplicate) {
int max = mp_audio_buffer_samples(ao_c->ao_buffer);
if (abs(skip_duplicate) > max)
skip_duplicate = skip_duplicate >= 0 ? max : -max;
mpctx->last_av_difference += skip_duplicate / play_samplerate;
if (skip_duplicate >= 0) {
mp_audio_buffer_skip(ao_c->ao_buffer, skip_duplicate);
MP_STATS(mpctx, "drop-audio");
} else {
mp_audio_buffer_duplicate(ao_c->ao_buffer, -skip_duplicate);
MP_STATS(mpctx, "duplicate-audio");
}
MP_VERBOSE(mpctx, "audio skip_duplicate=%d\n", skip_duplicate);
}
if (mpctx->audio_status == STATUS_SYNCING) {
if (end_sync)
mpctx->audio_status = STATUS_FILLING;
if (status != AD_OK && !mp_audio_buffer_samples(ao_c->ao_buffer))
mpctx->audio_status = STATUS_EOF;
if (working || end_sync)
mpctx->sleeptime = 0;
return; // continue on next iteration
}
assert(mpctx->audio_status >= STATUS_FILLING);
// We already have as much data as the audio device wants, and can start
// writing it any time.
if (mpctx->audio_status == STATUS_FILLING)
mpctx->audio_status = STATUS_READY;
// Even if we're done decoding and syncing, let video start first - this is
// required, because sending audio to the AO already starts playback.
if (mpctx->audio_status == STATUS_READY) {
if (mpctx->vo_chain && !mpctx->vo_chain->is_coverart &&
mpctx->video_status <= STATUS_READY)
return;
MP_VERBOSE(mpctx, "starting audio playback\n");
}
bool audio_eof = status == AD_EOF;
bool partial_fill = false;
int playflags = 0;
double endpts = get_play_end_pts(mpctx);
if (endpts != MP_NOPTS_VALUE) {
double samples = (endpts - written_audio_pts(mpctx) - opts->audio_delay)
* play_samplerate;
if (playsize > samples) {
playsize = MPMAX((int)samples / align * align, 0);
audio_eof = true;
partial_fill = true;
}
}
if (playsize > mp_audio_buffer_samples(ao_c->ao_buffer)) {
playsize = mp_audio_buffer_samples(ao_c->ao_buffer);
partial_fill = true;
}
audio_eof &= partial_fill;
// With gapless audio, delay this to ao_uninit. There must be only
// 1 final chunk, and that is handled when calling ao_uninit().
if (audio_eof && !opts->gapless_audio)
playflags |= AOPLAY_FINAL_CHUNK;
struct mp_audio data;
mp_audio_buffer_peek(ao_c->ao_buffer, &data);
if (audio_eof || data.samples >= align)
data.samples = data.samples / align * align;
data.samples = MPMIN(data.samples, mpctx->paused ? 0 : playsize);
int played = write_to_ao(mpctx, &data, playflags);
assert(played >= 0 && played <= data.samples);
mp_audio_buffer_skip(ao_c->ao_buffer, played);
mpctx->audio_drop_throttle =
MPMAX(0, mpctx->audio_drop_throttle - played / play_samplerate);
dump_audio_stats(mpctx);
mpctx->audio_status = STATUS_PLAYING;
if (audio_eof && !playsize) {
mpctx->audio_status = STATUS_DRAINING;
// Wait until the AO has played all queued data. In the gapless case,
// we trigger EOF immediately, and let it play asynchronously.
if (ao_eof_reached(mpctx->ao) || opts->gapless_audio)
mpctx->audio_status = STATUS_EOF;
}
}
// Drop data queued for output, or which the AO is currently outputting.
void clear_audio_output_buffers(struct MPContext *mpctx)
{
if (mpctx->ao)
ao_reset(mpctx->ao);
}
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