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mpv/libao2/audio_out.c
Uoti Urpala c8b3088c18 audio: move ready-for-ao data buffer from decoder to AO 
Move the buffer storing audio data ready to be fed to the audio output
driver from the audio decoder object to the AO object. This will help
encoding code deal with end of input, and may also be useful to
improve other general gapless audio behavior (as AOs which do not
accept chunks smaller than a certain size may keep them in the buffer
while the decoder changes).

Less data may be dropped now when changing audio filters or switching
timeline parts.
2011-07-02 09:22:32 +03:00

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/*
* 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 <string.h>
#include <assert.h>
#include "talloc.h"
#include "config.h"
#include "audio_out.h"
#include "mp_msg.h"
// there are some globals:
struct ao *global_ao;
char *ao_subdevice = NULL;
extern const struct ao_driver audio_out_oss;
extern const struct ao_driver audio_out_coreaudio;
extern const struct ao_driver audio_out_arts;
extern const struct ao_driver audio_out_rsound;
extern const struct ao_driver audio_out_esd;
extern const struct ao_driver audio_out_pulse;
extern const struct ao_driver audio_out_jack;
extern const struct ao_driver audio_out_openal;
extern const struct ao_driver audio_out_null;
extern const struct ao_driver audio_out_alsa5;
extern const struct ao_driver audio_out_alsa;
extern const struct ao_driver audio_out_nas;
extern const struct ao_driver audio_out_sdl;
extern const struct ao_driver audio_out_sun;
extern const struct ao_driver audio_out_sgi;
extern const struct ao_driver audio_out_win32;
extern const struct ao_driver audio_out_dsound;
extern const struct ao_driver audio_out_kai;
extern const struct ao_driver audio_out_dart;
extern const struct ao_driver audio_out_ivtv;
extern const struct ao_driver audio_out_v4l2;
extern const struct ao_driver audio_out_mpegpes;
extern const struct ao_driver audio_out_pcm;
extern const struct ao_driver audio_out_pss;
static const struct ao_driver * const audio_out_drivers[] = {
// native:
#ifdef CONFIG_DIRECTX
&audio_out_dsound,
#endif
#ifdef CONFIG_WIN32WAVEOUT
&audio_out_win32,
#endif
#ifdef CONFIG_KAI
&audio_out_kai,
#endif
#ifdef CONFIG_DART
&audio_out_dart,
#endif
#ifdef CONFIG_COREAUDIO
&audio_out_coreaudio,
#endif
#ifdef CONFIG_OSS_AUDIO
&audio_out_oss,
#endif
#ifdef CONFIG_ALSA
&audio_out_alsa,
#endif
#ifdef CONFIG_ALSA5
&audio_out_alsa5,
#endif
#ifdef CONFIG_SGI_AUDIO
&audio_out_sgi,
#endif
#ifdef CONFIG_SUN_AUDIO
&audio_out_sun,
#endif
// wrappers:
#ifdef CONFIG_ARTS
&audio_out_arts,
#endif
#ifdef CONFIG_ESD
&audio_out_esd,
#endif
#ifdef CONFIG_PULSE
&audio_out_pulse,
#endif
#ifdef CONFIG_JACK
&audio_out_jack,
#endif
#ifdef CONFIG_NAS
&audio_out_nas,
#endif
#ifdef CONFIG_SDL
&audio_out_sdl,
#endif
#ifdef CONFIG_OPENAL
&audio_out_openal,
#endif
&audio_out_mpegpes,
#ifdef CONFIG_IVTV
&audio_out_ivtv,
#endif
#ifdef CONFIG_V4L2_DECODER
&audio_out_v4l2,
#endif
&audio_out_null,
// should not be auto-selected:
&audio_out_pcm,
#ifdef CONFIG_RSOUND
&audio_out_rsound,
#endif
NULL
};
void list_audio_out(void)
{
int i=0;
mp_tmsg(MSGT_AO, MSGL_INFO, "Available audio output drivers:\n");
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_OUTPUTS\n");
while (audio_out_drivers[i]) {
const ao_info_t *info = audio_out_drivers[i++]->info;
mp_msg(MSGT_GLOBAL, MSGL_INFO, "\t%s\t%s\n", info->short_name,
info->name);
}
mp_msg(MSGT_GLOBAL, MSGL_INFO,"\n");
}
struct ao *ao_create(void)
{
struct ao *r = talloc(NULL, struct ao);
*r = (struct ao){.outburst = OUTBURST, .buffersize = -1};
return r;
}
void ao_init(struct ao *ao, char **ao_list)
{
/* Caller adding child blocks is not supported as we may call
* talloc_free_children() to clean up after failed open attempts.
*/
assert(talloc_total_blocks(ao) == 1);
struct ao backup = *ao;
if (!ao_list)
goto try_defaults;
// first try the preferred drivers, with their optional subdevice param:
while (*ao_list) {
char *ao_name = *ao_list;
if (!*ao_name)
goto try_defaults; // empty entry means try defaults
int ao_len;
char *params = strchr(ao_name, ':');
if (params) {
ao_len = params - ao_name;
params++;
} else
ao_len = strlen(ao_name);
mp_tmsg(MSGT_AO, MSGL_V,
"Trying preferred audio driver '%.*s', options '%s'\n",
ao_len, ao_name, params ? params : "[none]");
const struct ao_driver *audio_out = NULL;
for (int i = 0; audio_out_drivers[i]; i++) {
audio_out = audio_out_drivers[i];
if (!strncmp(audio_out->info->short_name, ao_name, ao_len))
break;
audio_out = NULL;
}
if (audio_out) {
// name matches, try it
ao->driver = audio_out;
if (audio_out->init(ao, params) >= 0) {
ao->driver = audio_out;
ao->initialized = true;
return;
}
mp_tmsg(MSGT_AO, MSGL_WARN,
"Failed to initialize audio driver '%s'\n", ao_name);
talloc_free_children(ao);
*ao = backup;
} else
mp_tmsg(MSGT_AO, MSGL_WARN, "No such audio driver '%.*s'\n",
ao_len, ao_name);
++ao_list;
}
return;
try_defaults:
mp_tmsg(MSGT_AO, MSGL_V, "Trying every known audio driver...\n");
// now try the rest...
for (int i = 0; audio_out_drivers[i]; i++) {
const struct ao_driver *audio_out = audio_out_drivers[i];
ao->driver = audio_out;
if (audio_out->init(ao, NULL) >= 0) {
ao->initialized = true;
ao->driver = audio_out;
return;
}
talloc_free_children(ao);
*ao = backup;
}
return;
}
void ao_uninit(struct ao *ao, bool cut_audio)
{
assert(ao->buffer.len >= ao->buffer_playable_size);
ao->buffer.len = ao->buffer_playable_size;
if (ao->initialized)
ao->driver->uninit(ao, cut_audio);
if (!cut_audio && ao->buffer.len)
mp_msg(MSGT_AO, MSGL_WARN, "Audio output truncated at end.\n");
talloc_free(ao);
}
int ao_play(struct ao *ao, void *data, int len, int flags)
{
return ao->driver->play(ao, data, len, flags);
}
int ao_control(struct ao *ao, int cmd, void *arg)
{
if (ao->driver->control)
return ao->driver->control(ao, cmd, arg);
return CONTROL_UNKNOWN;
}
double ao_get_delay(struct ao *ao)
{
if (!ao->driver->get_delay) {
assert(ao->untimed);
return 0;
}
return ao->driver->get_delay(ao);
}
int ao_get_space(struct ao *ao)
{
return ao->driver->get_space(ao);
}
void ao_reset(struct ao *ao)
{
ao->buffer.len = 0;
ao->buffer_playable_size = 0;
if (ao->driver->reset)
ao->driver->reset(ao);
}
void ao_pause(struct ao *ao)
{
if (ao->driver->pause)
ao->driver->pause(ao);
}
void ao_resume(struct ao *ao)
{
if (ao->driver->resume)
ao->driver->resume(ao);
}
int old_ao_init(struct ao *ao, char *params)
{
assert(!global_ao);
global_ao = ao;
ao_subdevice = params ? talloc_strdup(ao, params) : NULL;
if (ao->driver->old_functions->init(ao->samplerate, ao->channels,
ao->format, 0) == 0) {
global_ao = NULL;
return -1;
}
return 0;
}
void old_ao_uninit(struct ao *ao, bool cut_audio)
{
ao->driver->old_functions->uninit(cut_audio);
global_ao = NULL;
}
int old_ao_play(struct ao *ao, void *data, int len, int flags)
{
return ao->driver->old_functions->play(data, len, flags);
}
int old_ao_control(struct ao *ao, int cmd, void *arg)
{
return ao->driver->old_functions->control(cmd, arg);
}
float old_ao_get_delay(struct ao *ao)
{
return ao->driver->old_functions->get_delay();
}
int old_ao_get_space(struct ao *ao)
{
return ao->driver->old_functions->get_space();
}
void old_ao_reset(struct ao *ao)
{
ao->driver->old_functions->reset();
}
void old_ao_pause(struct ao *ao)
{
ao->driver->old_functions->pause();
}
void old_ao_resume(struct ao *ao)
{
ao->driver->old_functions->resume();
}
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