mpv/audio/decode/dec_audio.c

319 lines
10 KiB
C

/*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <libavutil/mem.h>
#include "demux/codec_tags.h"
#include "config.h"
#include "common/codecs.h"
#include "common/msg.h"
#include "misc/bstr.h"
#include "stream/stream.h"
#include "demux/demux.h"
#include "demux/stheader.h"
#include "dec_audio.h"
#include "ad.h"
#include "audio/format.h"
#include "audio/audio.h"
#include "audio/audio_buffer.h"
#include "audio/filter/af.h"
extern const struct ad_functions ad_mpg123;
extern const struct ad_functions ad_lavc;
extern const struct ad_functions ad_spdif;
static const struct ad_functions * const ad_drivers[] = {
&ad_lavc,
#if HAVE_MPG123
&ad_mpg123,
#endif
&ad_spdif,
NULL
};
// Drop audio buffer and reinit it (after format change)
// Returns whether the format was valid at all.
static bool reinit_audio_buffer(struct dec_audio *da)
{
if (!mp_audio_config_valid(&da->decoded)) {
MP_ERR(da, "Audio decoder did not specify audio "
"format, or requested an unsupported configuration!\n");
return false;
}
mp_audio_buffer_reinit(da->decode_buffer, &da->decoded);
return true;
}
static void uninit_decoder(struct dec_audio *d_audio)
{
if (d_audio->ad_driver) {
MP_VERBOSE(d_audio, "Uninit audio decoder.\n");
d_audio->ad_driver->uninit(d_audio);
}
d_audio->ad_driver = NULL;
talloc_free(d_audio->priv);
d_audio->priv = NULL;
}
static int init_audio_codec(struct dec_audio *d_audio, const char *decoder)
{
if (!d_audio->ad_driver->init(d_audio, decoder)) {
MP_VERBOSE(d_audio, "Audio decoder init failed.\n");
d_audio->ad_driver = NULL;
uninit_decoder(d_audio);
return 0;
}
d_audio->decode_buffer = mp_audio_buffer_create(NULL);
return 1;
}
struct mp_decoder_list *audio_decoder_list(void)
{
struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
for (int i = 0; ad_drivers[i] != NULL; i++)
ad_drivers[i]->add_decoders(list);
return list;
}
static struct mp_decoder_list *audio_select_decoders(const char *codec,
char *selection)
{
struct mp_decoder_list *list = audio_decoder_list();
struct mp_decoder_list *new = mp_select_decoders(list, codec, selection);
talloc_free(list);
return new;
}
static const struct ad_functions *find_driver(const char *name)
{
for (int i = 0; ad_drivers[i] != NULL; i++) {
if (strcmp(ad_drivers[i]->name, name) == 0)
return ad_drivers[i];
}
return NULL;
}
int audio_init_best_codec(struct dec_audio *d_audio, char *audio_decoders)
{
assert(!d_audio->ad_driver);
audio_reset_decoding(d_audio);
struct mp_decoder_entry *decoder = NULL;
struct mp_decoder_list *list =
audio_select_decoders(d_audio->header->codec, audio_decoders);
mp_print_decoders(d_audio->log, MSGL_V, "Codec list:", list);
for (int n = 0; n < list->num_entries; n++) {
struct mp_decoder_entry *sel = &list->entries[n];
const struct ad_functions *driver = find_driver(sel->family);
if (!driver)
continue;
MP_VERBOSE(d_audio, "Opening audio decoder %s:%s\n",
sel->family, sel->decoder);
d_audio->ad_driver = driver;
if (init_audio_codec(d_audio, sel->decoder)) {
decoder = sel;
break;
}
MP_WARN(d_audio, "Audio decoder init failed for "
"%s:%s\n", sel->family, sel->decoder);
}
if (d_audio->ad_driver) {
d_audio->decoder_desc =
talloc_asprintf(d_audio, "%s [%s:%s]", decoder->desc, decoder->family,
decoder->decoder);
MP_VERBOSE(d_audio, "Selected audio codec: %s\n", d_audio->decoder_desc);
} else {
MP_ERR(d_audio, "Failed to initialize an audio decoder for codec '%s'.\n",
d_audio->header->codec ? d_audio->header->codec : "<unknown>");
}
talloc_free(list);
return !!d_audio->ad_driver;
}
void audio_uninit(struct dec_audio *d_audio)
{
if (!d_audio)
return;
MP_VERBOSE(d_audio, "Uninit audio filters...\n");
af_destroy(d_audio->afilter);
uninit_decoder(d_audio);
talloc_free(d_audio->decode_buffer);
talloc_free(d_audio);
}
/* Decode packets until we know the audio format. Then reinit the buffer.
* Returns AD_OK on success, negative AD_* code otherwise.
* Also returns AD_OK if already initialized (and does nothing).
*/
int initial_audio_decode(struct dec_audio *da)
{
while (!mp_audio_config_valid(&da->decoded)) {
if (da->decoded.samples > 0)
return AD_ERR; // invalid format, rather than uninitialized
int ret = da->ad_driver->decode_packet(da);
if (ret < 0)
return ret;
}
if (mp_audio_buffer_samples(da->decode_buffer) > 0) // avoid accidental flush
return AD_OK;
return reinit_audio_buffer(da) ? AD_OK : AD_ERR;
}
// Filter len bytes of input, put result into outbuf.
static int filter_n_bytes(struct dec_audio *da, struct mp_audio_buffer *outbuf,
int len)
{
bool format_change = false;
int error = 0;
assert(len > 0); // would break EOF logic below
while (mp_audio_buffer_samples(da->decode_buffer) < len) {
// Check for a format change
struct mp_audio config;
mp_audio_buffer_get_format(da->decode_buffer, &config);
format_change = !mp_audio_config_equals(&da->decoded, &config);
if (format_change) {
error = AD_EOF; // drain remaining data left in the current buffer
break;
}
if (da->decoded.samples > 0) {
int copy = MPMIN(da->decoded.samples, len);
struct mp_audio append = da->decoded;
append.samples = copy;
mp_audio_buffer_append(da->decode_buffer, &append);
mp_audio_skip_samples(&da->decoded, copy);
da->pts_offset += copy;
continue;
}
error = da->ad_driver->decode_packet(da);
if (error < 0)
break;
}
if (error == AD_WAIT)
return error;
// Filter
struct mp_audio filter_data;
mp_audio_buffer_peek(da->decode_buffer, &filter_data);
filter_data.rate = da->afilter->input.rate; // due to playback speed change
len = MPMIN(filter_data.samples, len);
filter_data.samples = len;
bool eof = error == AD_EOF && filter_data.samples == 0;
if (af_filter(da->afilter, &filter_data, eof ? AF_FILTER_FLAG_EOF : 0) < 0)
return AD_ERR;
mp_audio_buffer_append(outbuf, &filter_data);
if (error == AD_EOF && filter_data.samples > 0)
error = 0; // don't end playback yet
// remove processed data from decoder buffer:
mp_audio_buffer_skip(da->decode_buffer, len);
// if format was changed, and all data was drained, execute the format change
if (format_change && eof) {
error = AD_NEW_FMT;
if (!reinit_audio_buffer(da))
error = AD_ERR; // switch to invalid format
}
return error;
}
/* 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. */
int audio_decode(struct dec_audio *d_audio, struct mp_audio_buffer *outbuf,
int minsamples)
{
if (d_audio->afilter->initialized < 1)
return AD_ERR;
// Indicates that a filter seems to be buffering large amounts of data
int huge_filter_buffer = 0;
/* Filter output size will be about filter_multiplier times input size.
* If some filter buffers audio in big blocks this might only hold
* as average over time. */
double filter_multiplier = af_calc_filter_multiplier(d_audio->afilter);
int prev_buffered = -1;
int res = 0;
MP_STATS(d_audio, "start audio");
while (res >= 0 && minsamples >= 0) {
int buffered = mp_audio_buffer_samples(outbuf);
if (minsamples < buffered || buffered == prev_buffered)
break;
prev_buffered = buffered;
int decsamples = (minsamples - buffered) / filter_multiplier;
// + some extra for possible filter buffering, and avoid 0
decsamples += 512;
if (huge_filter_buffer) {
/* Some filter must be doing significant buffering if the estimated
* input length didn't produce enough output from filters.
* Feed the filters 250 samples at a time until we have enough
* output. Very small amounts could make filtering inefficient while
* large amounts can make mpv demux the file unnecessarily far ahead
* to get audio data and buffer video frames in memory while doing
* so. However the performance impact of either is probably not too
* significant as long as the value is not completely insane. */
decsamples = 250;
}
/* if this iteration does not fill buffer, we must have lots
* of buffering in filters */
huge_filter_buffer = 1;
res = filter_n_bytes(d_audio, outbuf, decsamples);
}
MP_STATS(d_audio, "end audio");
return res;
}
void audio_reset_decoding(struct dec_audio *d_audio)
{
if (d_audio->ad_driver)
d_audio->ad_driver->control(d_audio, ADCTRL_RESET, NULL);
af_control_all(d_audio->afilter, AF_CONTROL_RESET, NULL);
d_audio->pts = MP_NOPTS_VALUE;
d_audio->pts_offset = 0;
if (d_audio->decode_buffer)
mp_audio_buffer_clear(d_audio->decode_buffer);
}