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mpv/player/misc.c
wm4 f9ba1a3ddf demux: remove weird tripple-buffering for the sh_stream list
The demuxer infrastructure was originally single-threaded. To make it
suitable for multithreading (specifically, demuxing and decoding on
separate threads), some sort of tripple-buffering was introduced. There
are separate "struct demuxer" allocations. The demuxer thread sets the
state on d_thread. If anything changes, the state is copied to d_buffer
(the copy is protected by a lock), and the decoder thread is notified.
Then the decoder thread copies the state from d_buffer to d_user (again
while holding a lock). This avoids the need for locking in the
demuxer/decoder code itself (only demux.c needs an internal, "invisible"
lock.)

Remove the streams/num_streams fields from this tripple-buffering
schema. Move them to the internal struct, and protect them with the
internal lock. Use accessors for read access outside of demux.c.

Other than replacing all field accesses with accessors, this separates
allocating and adding sh_streams. This is needed to avoid race
conditions. Before this change, this was awkwardly handled by first
initializing the sh_stream, and then sending a stream change event. Now
the stream is allocated, then initialized, and then declared as
immutable and added (at which point it becomes visible to the decoder
thread immediately).

This change is useful for PR #2626. And eventually, we should probably
get entirely of the tripple buffering, and this makes a nice first step.
2015-12-23 21:52:16 +01:00

317 lines
9.4 KiB
C

/*
* 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 <pthread.h>
#include <assert.h>
#include "config.h"
#include "talloc.h"
#include "osdep/io.h"
#include "osdep/timer.h"
#include "osdep/threads.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/m_property.h"
#include "options/m_config.h"
#include "common/common.h"
#include "common/global.h"
#include "common/encode.h"
#include "common/playlist.h"
#include "input/input.h"
#include "audio/out/ao.h"
#include "demux/demux.h"
#include "stream/stream.h"
#include "video/out/vo.h"
#include "core.h"
#include "command.h"
double get_relative_time(struct MPContext *mpctx)
{
int64_t new_time = mp_time_us();
int64_t delta = new_time - mpctx->last_time;
mpctx->last_time = new_time;
return delta * 0.000001;
}
double rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t)
{
double length = get_time_length(mpctx);
switch (t.type) {
case REL_TIME_ABSOLUTE:
return t.pos;
case REL_TIME_RELATIVE:
if (t.pos >= 0) {
return t.pos;
} else {
if (length >= 0)
return MPMAX(length + t.pos, 0.0);
}
break;
case REL_TIME_PERCENT:
if (length >= 0)
return length * (t.pos / 100.0);
break;
case REL_TIME_CHAPTER:
if (chapter_start_time(mpctx, t.pos) != MP_NOPTS_VALUE)
return chapter_start_time(mpctx, t.pos);
break;
}
return MP_NOPTS_VALUE;
}
double get_play_end_pts(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
double end = MP_NOPTS_VALUE;
if (opts->play_end.type) {
end = rel_time_to_abs(mpctx, opts->play_end);
} else if (opts->play_length.type) {
double start = rel_time_to_abs(mpctx, opts->play_start);
if (start == MP_NOPTS_VALUE)
start = 0;
double length = rel_time_to_abs(mpctx, opts->play_length);
if (length != MP_NOPTS_VALUE)
end = start + length;
}
if (opts->chapterrange[1] > 0) {
double cend = chapter_start_time(mpctx, opts->chapterrange[1]);
if (cend != MP_NOPTS_VALUE && (end == MP_NOPTS_VALUE || cend < end))
end = cend;
}
return end;
}
// Time used to seek external tracks to.
double get_main_demux_pts(struct MPContext *mpctx)
{
double main_new_pos = MP_NOPTS_VALUE;
if (mpctx->demuxer) {
for (int n = 0; n < demux_get_num_stream(mpctx->demuxer); n++) {
struct sh_stream *stream = demux_get_stream(mpctx->demuxer, n);
if (main_new_pos == MP_NOPTS_VALUE && stream->type != STREAM_SUB)
main_new_pos = demux_get_next_pts(stream);
}
}
return main_new_pos;
}
float mp_get_cache_percent(struct MPContext *mpctx)
{
if (mpctx->demuxer) {
int64_t size = -1;
int64_t fill = -1;
demux_stream_control(mpctx->demuxer, STREAM_CTRL_GET_CACHE_SIZE, &size);
demux_stream_control(mpctx->demuxer, STREAM_CTRL_GET_CACHE_FILL, &fill);
if (size > 0 && fill >= 0)
return fill / (size / 100.0);
}
return -1;
}
bool mp_get_cache_idle(struct MPContext *mpctx)
{
int idle = 0;
if (mpctx->demuxer)
demux_stream_control(mpctx->demuxer, STREAM_CTRL_GET_CACHE_IDLE, &idle);
return idle;
}
void update_vo_playback_state(struct MPContext *mpctx)
{
if (mpctx->video_out) {
struct voctrl_playback_state oldstate = mpctx->vo_playback_state;
struct voctrl_playback_state newstate = {
.playing = mpctx->playing,
.paused = mpctx->paused,
.percent_pos = get_percent_pos(mpctx),
};
if (oldstate.playing != newstate.playing ||
oldstate.paused != newstate.paused ||
oldstate.percent_pos != newstate.percent_pos) {
vo_control(mpctx->video_out,
VOCTRL_UPDATE_PLAYBACK_STATE, &newstate);
mpctx->vo_playback_state = newstate;
}
} else {
mpctx->vo_playback_state = (struct voctrl_playback_state){ 0 };
}
}
void update_window_title(struct MPContext *mpctx, bool force)
{
if (!mpctx->video_out && !mpctx->ao) {
talloc_free(mpctx->last_window_title);
mpctx->last_window_title = NULL;
return;
}
char *title = mp_property_expand_string(mpctx, mpctx->opts->wintitle);
if (!mpctx->last_window_title || force ||
strcmp(title, mpctx->last_window_title) != 0)
{
talloc_free(mpctx->last_window_title);
mpctx->last_window_title = talloc_steal(mpctx, title);
if (mpctx->video_out)
vo_control(mpctx->video_out, VOCTRL_UPDATE_WINDOW_TITLE, title);
if (mpctx->ao) {
ao_control(mpctx->ao, AOCONTROL_UPDATE_STREAM_TITLE, title);
}
} else {
talloc_free(title);
}
}
void error_on_track(struct MPContext *mpctx, struct track *track)
{
if (!track)
return;
mp_deselect_track(mpctx, track);
if (track) {
if (track->type == STREAM_AUDIO)
MP_INFO(mpctx, "Audio: no audio\n");
if (track->type == STREAM_VIDEO)
MP_INFO(mpctx, "Video: no video\n");
if (mpctx->opts->stop_playback_on_init_failure ||
(!mpctx->current_track[0][STREAM_AUDIO] &&
!mpctx->current_track[0][STREAM_VIDEO]))
{
if (!mpctx->stop_play)
mpctx->stop_play = PT_ERROR;
if (mpctx->error_playing >= 0)
mpctx->error_playing = MPV_ERROR_NOTHING_TO_PLAY;
}
mpctx->sleeptime = 0;
}
}
int stream_dump(struct MPContext *mpctx, const char *source_filename)
{
struct MPOpts *opts = mpctx->opts;
stream_t *stream = stream_open(source_filename, mpctx->global);
if (!stream)
return -1;
int64_t size = stream_get_size(stream);
stream_set_capture_file(stream, opts->stream_dump);
while (mpctx->stop_play == KEEP_PLAYING && !stream->eof) {
if (!opts->quiet && ((stream->pos / (1024 * 1024)) % 2) == 1) {
uint64_t pos = stream->pos;
MP_MSG(mpctx, MSGL_STATUS, "Dumping %lld/%lld...",
(long long int)pos, (long long int)size);
}
stream_fill_buffer(stream);
mp_process_input(mpctx);
}
free_stream(stream);
return 0;
}
void merge_playlist_files(struct playlist *pl)
{
if (!pl->first)
return;
char *edl = talloc_strdup(NULL, "edl://");
for (struct playlist_entry *e = pl->first; e; e = e->next) {
if (e != pl->first)
edl = talloc_strdup_append_buffer(edl, ";");
// Escape if needed
if (e->filename[strcspn(e->filename, "=%,;\n")] ||
bstr_strip(bstr0(e->filename)).len != strlen(e->filename))
{
// %length%
edl = talloc_asprintf_append_buffer(edl, "%%%zd%%", strlen(e->filename));
}
edl = talloc_strdup_append_buffer(edl, e->filename);
}
playlist_clear(pl);
playlist_add_file(pl, edl);
talloc_free(edl);
}
// Create a talloc'ed copy of mpctx->global. It contains a copy of the global
// option struct. It still just references some things though, like mp_log.
// The main purpose is letting threads access the option struct without the
// need for additional synchronization.
struct mpv_global *create_sub_global(struct MPContext *mpctx)
{
struct mpv_global *new = talloc_ptrtype(NULL, new);
struct m_config *new_config = m_config_dup(new, mpctx->mconfig);
*new = (struct mpv_global){
.log = mpctx->global->log,
.opts = new_config->optstruct,
};
return new;
}
struct wrapper_args {
struct MPContext *mpctx;
void (*thread_fn)(void *);
void *thread_arg;
pthread_mutex_t mutex;
bool done;
};
static void *thread_wrapper(void *pctx)
{
struct wrapper_args *args = pctx;
mpthread_set_name("opener");
args->thread_fn(args->thread_arg);
pthread_mutex_lock(&args->mutex);
args->done = true;
pthread_mutex_unlock(&args->mutex);
mp_input_wakeup(args->mpctx->input); // this interrupts mp_idle()
return NULL;
}
// Run the thread_fn in a new thread. Wait until the thread returns, but while
// waiting, process input and input commands.
int mpctx_run_reentrant(struct MPContext *mpctx, void (*thread_fn)(void *arg),
void *thread_arg)
{
struct wrapper_args args = {mpctx, thread_fn, thread_arg};
pthread_mutex_init(&args.mutex, NULL);
bool success = false;
pthread_t thread;
if (pthread_create(&thread, NULL, thread_wrapper, &args))
goto done;
while (!success) {
mp_idle(mpctx);
if (mpctx->stop_play)
mp_cancel_trigger(mpctx->playback_abort);
pthread_mutex_lock(&args.mutex);
success |= args.done;
pthread_mutex_unlock(&args.mutex);
}
pthread_join(thread, NULL);
done:
pthread_mutex_destroy(&args.mutex);
return success ? 0 : -1;
}