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mpv/demux/demux.c

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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 <unistd.h>
#include <pthread.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "config.h"
#include "options/options.h"
#include "talloc.h"
#include "common/msg.h"
#include "common/global.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "mf.h"
#include "audio/format.h"
// Demuxer list
extern const struct demuxer_desc demuxer_desc_edl;
extern const struct demuxer_desc demuxer_desc_cue;
extern const demuxer_desc_t demuxer_desc_rawaudio;
extern const demuxer_desc_t demuxer_desc_rawvideo;
extern const demuxer_desc_t demuxer_desc_tv;
extern const demuxer_desc_t demuxer_desc_mf;
extern const demuxer_desc_t demuxer_desc_matroska;
extern const demuxer_desc_t demuxer_desc_lavf;
extern const demuxer_desc_t demuxer_desc_libass;
extern const demuxer_desc_t demuxer_desc_subreader;
extern const demuxer_desc_t demuxer_desc_playlist;
extern const demuxer_desc_t demuxer_desc_disc;
/* Please do not add any new demuxers here. If you want to implement a new
* demuxer, add it to libavformat, except for wrappers around external
* libraries and demuxers requiring binary support. */
const demuxer_desc_t *const demuxer_list[] = {
&demuxer_desc_disc,
&demuxer_desc_edl,
&demuxer_desc_cue,
&demuxer_desc_rawaudio,
&demuxer_desc_rawvideo,
#if HAVE_TV
&demuxer_desc_tv,
#endif
#if HAVE_LIBASS
&demuxer_desc_libass,
#endif
&demuxer_desc_matroska,
&demuxer_desc_lavf,
&demuxer_desc_mf,
&demuxer_desc_playlist,
// Pretty aggressive, so should be last.
&demuxer_desc_subreader,
NULL
};
struct demux_internal {
struct mp_log *log;
// The demuxer runs potentially in another thread, so we keep two demuxer
// structs; the real demuxer can access the shadow struct only.
// Since demuxer and user threads both don't use locks, a third demuxer
// struct d_buffer is used to copy data between them in a synchronized way.
struct demuxer *d_thread; // accessed by demuxer impl. (producer)
struct demuxer *d_user; // accessed by player (consumer)
struct demuxer *d_buffer; // protected by lock; used to sync d_user/thread
// The lock protects the packet queues (struct demux_stream), d_buffer,
// and some minor fields like thread_paused.
pthread_mutex_t lock;
pthread_cond_t wakeup;
pthread_t thread;
// -- All the following fields are protected by lock.
bool thread_paused;
int thread_request_pause; // counter, if >0, make demuxer thread pause
bool thread_terminate;
bool threading;
void (*wakeup_cb)(void *ctx);
void *wakeup_cb_ctx;
bool warned_queue_overflow;
bool last_eof; // last actual global EOF status
bool eof; // whether we're in EOF state (reset for retry)
bool autoselect;
double min_secs;
int min_packs;
int min_bytes;
bool tracks_switched; // thread needs to inform demuxer of this
bool seeking; // there's a seek queued
int seek_flags; // flags for next seek (if seeking==true)
double seek_pts;
// Cached state.
double time_length;
struct mp_tags *stream_metadata;
int64_t stream_size;
int64_t stream_cache_size;
int64_t stream_cache_fill;
int stream_cache_idle;
};
struct demux_stream {
struct demux_internal *in;
enum stream_type type;
// all fields are protected by in->lock
bool selected; // user wants packets from this stream
bool active; // try to keep at least 1 packet queued
bool eof; // end of demuxed stream? (true if all buffer empty)
size_t packs; // number of packets in buffer
size_t bytes; // total bytes of packets in buffer
double base_ts; // timestamp of the last packet returned to decoder
double last_ts; // timestamp of the last packet added to queue
struct demux_packet *head;
struct demux_packet *tail;
};
static void demuxer_sort_chapters(demuxer_t *demuxer);
static void *demux_thread(void *pctx);
static void update_cache(struct demux_internal *in);
// called locked
static void ds_flush(struct demux_stream *ds)
{
demux_packet_t *dp = ds->head;
while (dp) {
demux_packet_t *dn = dp->next;
free_demux_packet(dp);
dp = dn;
}
ds->head = ds->tail = NULL;
ds->packs = 0;
ds->bytes = 0;
ds->last_ts = ds->base_ts = MP_NOPTS_VALUE;
ds->eof = false;
ds->active = false;
}
struct sh_stream *new_sh_stream(demuxer_t *demuxer, enum stream_type type)
{
assert(demuxer == demuxer->in->d_thread);
if (demuxer->num_streams > MAX_SH_STREAMS) {
MP_WARN(demuxer, "Too many streams.\n");
return NULL;
}
int demuxer_id = 0;
for (int n = 0; n < demuxer->num_streams; n++) {
if (demuxer->streams[n]->type == type)
demuxer_id++;
}
struct sh_stream *sh = talloc_ptrtype(demuxer, sh);
*sh = (struct sh_stream) {
.type = type,
.index = demuxer->num_streams,
.demuxer_id = demuxer_id, // may be overwritten by demuxer
.ds = talloc(sh, struct demux_stream),
};
*sh->ds = (struct demux_stream) {
.in = demuxer->in,
.type = sh->type,
.selected = demuxer->in->autoselect,
};
MP_TARRAY_APPEND(demuxer, demuxer->streams, demuxer->num_streams, sh);
switch (sh->type) {
case STREAM_VIDEO: sh->video = talloc_zero(demuxer, struct sh_video); break;
case STREAM_AUDIO: sh->audio = talloc_zero(demuxer, struct sh_audio); break;
case STREAM_SUB: sh->sub = talloc_zero(demuxer, struct sh_sub); break;
}
return sh;
}
void free_demuxer(demuxer_t *demuxer)
{
if (!demuxer)
return;
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
demux_stop_thread(demuxer);
if (demuxer->desc->close)
demuxer->desc->close(in->d_thread);
for (int n = 0; n < demuxer->num_streams; n++)
ds_flush(demuxer->streams[n]->ds);
pthread_mutex_destroy(&in->lock);
pthread_cond_destroy(&in->wakeup);
talloc_free(demuxer);
}
// Start the demuxer thread, which reads ahead packets on its own.
void demux_start_thread(struct demuxer *demuxer)
{
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
if (!in->threading) {
in->threading = true;
if (pthread_create(&in->thread, NULL, demux_thread, in))
in->threading = false;
}
}
void demux_stop_thread(struct demuxer *demuxer)
{
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
if (in->threading) {
pthread_mutex_lock(&in->lock);
in->thread_terminate = true;
pthread_cond_signal(&in->wakeup);
pthread_mutex_unlock(&in->lock);
pthread_join(in->thread, NULL);
in->threading = false;
in->thread_terminate = false;
}
}
// The demuxer thread will call cb(ctx) if there's a new packet, or EOF is reached.
void demux_set_wakeup_cb(struct demuxer *demuxer, void (*cb)(void *ctx), void *ctx)
{
struct demux_internal *in = demuxer->in;
pthread_mutex_lock(&in->lock);
in->wakeup_cb = cb;
in->wakeup_cb_ctx = ctx;
pthread_mutex_unlock(&in->lock);
}
const char *stream_type_name(enum stream_type type)
{
switch (type) {
case STREAM_VIDEO: return "video";
case STREAM_AUDIO: return "audio";
case STREAM_SUB: return "sub";
default: return "unknown";
}
}
// Returns the same value as demuxer->fill_buffer: 1 ok, 0 EOF/not selected.
int demux_add_packet(struct sh_stream *stream, demux_packet_t *dp)
{
struct demux_stream *ds = stream ? stream->ds : NULL;
if (!dp || !ds) {
talloc_free(dp);
return 0;
}
struct demux_internal *in = ds->in;
pthread_mutex_lock(&in->lock);
if (!ds->selected || in->seeking) {
pthread_mutex_unlock(&in->lock);
talloc_free(dp);
return 0;
}
dp->stream = stream->index;
dp->next = NULL;
ds->packs++;
ds->bytes += dp->len;
if (ds->tail) {
// next packet in stream
ds->tail->next = dp;
ds->tail = dp;
} else {
// first packet in stream
ds->head = ds->tail = dp;
}
// obviously not true anymore
ds->eof = false;
in->last_eof = in->eof = false;
// For video, PTS determination is not trivial, but for other media types
// distinguishing PTS and DTS is not useful.
if (stream->type != STREAM_VIDEO && dp->pts == MP_NOPTS_VALUE)
dp->pts = dp->dts;
double ts = dp->dts == MP_NOPTS_VALUE ? dp->pts : dp->dts;
if (ts != MP_NOPTS_VALUE && (ts > ds->last_ts || ts + 10 < ds->last_ts))
ds->last_ts = ts;
if (ds->base_ts == MP_NOPTS_VALUE)
ds->base_ts = ds->last_ts;
MP_DBG(in, "append packet to %s: size=%d pts=%f dts=%f pos=%"PRIi64" "
"[num=%zd size=%zd]\n", stream_type_name(stream->type),
dp->len, dp->pts, dp->dts, dp->pos, ds->packs, ds->bytes);
if (ds->in->wakeup_cb && !ds->head->next)
ds->in->wakeup_cb(ds->in->wakeup_cb_ctx);
pthread_cond_signal(&in->wakeup);
pthread_mutex_unlock(&in->lock);
return 1;
}
// Returns true if there was "progress" (lock was released temporarily).
static bool read_packet(struct demux_internal *in)
{
in->eof = false;
// Check if we need to read a new packet. We do this if all queues are below
// the minimum, or if a stream explicitly needs new packets. Also includes
// safe-guards against packet queue overflow.
bool active = false, read_more = false;
size_t packs = 0, bytes = 0;
for (int n = 0; n < in->d_buffer->num_streams; n++) {
struct demux_stream *ds = in->d_buffer->streams[n]->ds;
active |= ds->active;
read_more |= ds->active && !ds->head;
packs += ds->packs;
bytes += ds->bytes;
if (ds->active && ds->last_ts != MP_NOPTS_VALUE && in->min_secs > 0)
read_more |= ds->last_ts - ds->base_ts < in->min_secs;
}
MP_DBG(in, "packets=%zd, bytes=%zd, active=%d, more=%d\n",
packs, bytes, active, read_more);
if (packs >= MAX_PACKS || bytes >= MAX_PACK_BYTES) {
if (!in->warned_queue_overflow) {
in->warned_queue_overflow = true;
MP_ERR(in, "Too many packets in the demuxer packet queues:\n");
for (int n = 0; n < in->d_buffer->num_streams; n++) {
struct demux_stream *ds = in->d_buffer->streams[n]->ds;
if (ds->selected) {
MP_ERR(in, " %s/%d: %zd packets, %zd bytes\n",
stream_type_name(ds->type), n, ds->packs, ds->bytes);
}
}
}
for (int n = 0; n < in->d_buffer->num_streams; n++) {
struct demux_stream *ds = in->d_buffer->streams[n]->ds;
ds->eof |= !ds->head;
}
pthread_cond_signal(&in->wakeup);
return false;
}
if (packs < in->min_packs && bytes < in->min_bytes)
read_more |= active;
if (!read_more)
return false;
// Actually read a packet. Drop the lock while doing so, because waiting
// for disk or network I/O can take time.
pthread_mutex_unlock(&in->lock);
struct demuxer *demux = in->d_thread;
bool eof = !demux->desc->fill_buffer || demux->desc->fill_buffer(demux) <= 0;
pthread_mutex_lock(&in->lock);
update_cache(in);
if (eof) {
for (int n = 0; n < in->d_buffer->num_streams; n++) {
struct demux_stream *ds = in->d_buffer->streams[n]->ds;
ds->eof = true;
ds->active = false;
}
// If we had EOF previously, then don't wakeup (avoids wakeup loop)
if (!in->last_eof) {
if (in->wakeup_cb)
in->wakeup_cb(in->wakeup_cb_ctx);
pthread_cond_signal(&in->wakeup);
MP_VERBOSE(in, "EOF reached.\n");
}
}
in->eof = in->last_eof = eof;
return true;
}
// must be called locked; may temporarily unlock
static void ds_get_packets(struct demux_stream *ds)
{
const char *t = stream_type_name(ds->type);
struct demux_internal *in = ds->in;
MP_DBG(in, "reading packet for %s\n", t);
in->eof = false; // force retry
ds->eof = false;
while (ds->selected && !ds->head && !ds->eof) {
ds->active = true;
// Note: the following code marks EOF if it can't continue
if (in->threading) {
MP_VERBOSE(in, "waiting for demux thread (%s)\n", t);
pthread_cond_signal(&in->wakeup);
pthread_cond_wait(&in->wakeup, &in->lock);
} else {
read_packet(in);
}
}
}
static void execute_trackswitch(struct demux_internal *in)
{
in->tracks_switched = false;
pthread_mutex_unlock(&in->lock);
if (in->d_thread->desc->control)
in->d_thread->desc->control(in->d_thread, DEMUXER_CTRL_SWITCHED_TRACKS, 0);
pthread_mutex_lock(&in->lock);
}
static void execute_seek(struct demux_internal *in)
{
int flags = in->seek_flags;
double pts = in->seek_pts;
in->seeking = false;
pthread_mutex_unlock(&in->lock);
if (in->d_thread->desc->seek)
in->d_thread->desc->seek(in->d_thread, pts, flags);
pthread_mutex_lock(&in->lock);
}
static void *demux_thread(void *pctx)
{
struct demux_internal *in = pctx;
pthread_mutex_lock(&in->lock);
while (!in->thread_terminate) {
in->thread_paused = in->thread_request_pause > 0;
if (in->thread_paused) {
pthread_cond_signal(&in->wakeup);
pthread_cond_wait(&in->wakeup, &in->lock);
continue;
}
if (in->tracks_switched) {
execute_trackswitch(in);
continue;
}
if (in->seeking) {
execute_seek(in);
continue;
}
if (!in->eof) {
if (read_packet(in))
continue; // read_packet unlocked, so recheck conditions
}
update_cache(in);
pthread_cond_signal(&in->wakeup);
pthread_cond_wait(&in->wakeup, &in->lock);
}
pthread_mutex_unlock(&in->lock);
return NULL;
}
static struct demux_packet *dequeue_packet(struct demux_stream *ds)
{
if (!ds->head)
return NULL;
struct demux_packet *pkt = ds->head;
ds->head = pkt->next;
pkt->next = NULL;
if (!ds->head)
ds->tail = NULL;
ds->bytes -= pkt->len;
ds->packs--;
double ts = pkt->dts == MP_NOPTS_VALUE ? pkt->pts : pkt->dts;
if (ts != MP_NOPTS_VALUE)
ds->base_ts = ts;
// This implies this function is actually called from "the" user thread.
if (pkt && pkt->pos >= 0)
ds->in->d_user->filepos = pkt->pos;
return pkt;
}
// Read a packet from the given stream. The returned packet belongs to the
// caller, who has to free it with talloc_free(). Might block. Returns NULL
// on EOF.
struct demux_packet *demux_read_packet(struct sh_stream *sh)
{
struct demux_stream *ds = sh ? sh->ds : NULL;
struct demux_packet *pkt = NULL;
if (ds) {
pthread_mutex_lock(&ds->in->lock);
ds_get_packets(ds);
pkt = dequeue_packet(ds);
pthread_cond_signal(&ds->in->wakeup); // possibly read more
pthread_mutex_unlock(&ds->in->lock);
}
return pkt;
}
// Poll the demuxer queue, and if there's a packet, return it. Otherwise, just
// make the demuxer thread read packets for this stream, and if there's at
// least one packet, call the wakeup callback.
// Unlike demux_read_packet(), this always enables readahead (which means you
// must not use it on interleaved subtitle streams).
// Returns:
// < 0: EOF was reached, *out_pkt=NULL
// == 0: no new packet yet, but maybe later, *out_pkt=NULL
// > 0: new packet read, *out_pkt is set
int demux_read_packet_async(struct sh_stream *sh, struct demux_packet **out_pkt)
{
struct demux_stream *ds = sh ? sh->ds : NULL;
int r = -1;
*out_pkt = NULL;
if (ds) {
if (ds->in->threading) {
pthread_mutex_lock(&ds->in->lock);
*out_pkt = dequeue_packet(ds);
r = *out_pkt ? 1 : (ds->eof ? -1 : 0);
ds->active = ds->selected; // enable readahead
ds->in->eof = false; // force retry
pthread_cond_signal(&ds->in->wakeup); // possibly read more
pthread_mutex_unlock(&ds->in->lock);
} else {
*out_pkt = demux_read_packet(sh);
r = *out_pkt ? 1 : -1;
}
}
return r;
}
// Return the pts of the next packet that demux_read_packet() would return.
// Might block. Sometimes used to force a packet read, without removing any
// packets from the queue.
double demux_get_next_pts(struct sh_stream *sh)
{
double res = MP_NOPTS_VALUE;
if (sh) {
pthread_mutex_lock(&sh->ds->in->lock);
ds_get_packets(sh->ds);
if (sh->ds->head)
res = sh->ds->head->pts;
pthread_mutex_unlock(&sh->ds->in->lock);
}
return res;
}
// Return whether a packet is queued. Never blocks, never forces any reads.
bool demux_has_packet(struct sh_stream *sh)
{
bool has_packet = false;
if (sh) {
pthread_mutex_lock(&sh->ds->in->lock);
has_packet = sh->ds->head;
pthread_mutex_unlock(&sh->ds->in->lock);
}
return has_packet;
}
// Read and return any packet we find.
struct demux_packet *demux_read_any_packet(struct demuxer *demuxer)
{
assert(!demuxer->in->threading); // doesn't work with threading
bool read_more = true;
while (read_more) {
for (int n = 0; n < demuxer->num_streams; n++) {
struct sh_stream *sh = demuxer->streams[n];
sh->ds->active = sh->ds->selected; // force read_packet() to read
struct demux_packet *pkt = dequeue_packet(sh->ds);
if (pkt)
return pkt;
}
// retry after calling this
pthread_mutex_lock(&demuxer->in->lock);
read_more = read_packet(demuxer->in);
read_more &= !demuxer->in->eof;
pthread_mutex_unlock(&demuxer->in->lock);
}
return NULL;
}
// ====================================================================
void demuxer_help(struct mp_log *log)
{
int i;
mp_info(log, "Available demuxers:\n");
mp_info(log, " demuxer: info:\n");
for (i = 0; demuxer_list[i]; i++) {
mp_info(log, "%10s %s\n",
demuxer_list[i]->name, demuxer_list[i]->desc);
}
}
static const char *d_level(enum demux_check level)
{
switch (level) {
case DEMUX_CHECK_FORCE: return "force";
case DEMUX_CHECK_UNSAFE: return "unsafe";
case DEMUX_CHECK_REQUEST:return "request";
case DEMUX_CHECK_NORMAL: return "normal";
}
abort();
}
static int decode_float(char *str, float *out)
{
char *rest;
float dec_val;
dec_val = strtod(str, &rest);
if (!rest || (rest == str) || !isfinite(dec_val))
return -1;
*out = dec_val;
return 0;
}
static int decode_gain(demuxer_t *demuxer, const char *tag, float *out)
{
char *tag_val = NULL;
float dec_val;
tag_val = mp_tags_get_str(demuxer->metadata, tag);
if (!tag_val) {
mp_msg(demuxer->log, MSGL_V, "Replaygain tags not found\n");
return -1;
}
if (decode_float(tag_val, &dec_val)) {
mp_msg(demuxer->log, MSGL_ERR, "Invalid replaygain value\n");
return -1;
}
*out = dec_val;
return 0;
}
static int decode_peak(demuxer_t *demuxer, const char *tag, float *out)
{
char *tag_val = NULL;
float dec_val;
*out = 1.0;
tag_val = mp_tags_get_str(demuxer->metadata, tag);
if (!tag_val)
return 0;
if (decode_float(tag_val, &dec_val))
return 0;
if (dec_val == 0.0)
return 0;
*out = dec_val;
return 0;
}
static void demux_export_replaygain(demuxer_t *demuxer)
{
float tg, tp, ag, ap;
if (!decode_gain(demuxer, "REPLAYGAIN_TRACK_GAIN", &tg) &&
!decode_peak(demuxer, "REPLAYGAIN_TRACK_PEAK", &tp) &&
!decode_gain(demuxer, "REPLAYGAIN_ALBUM_GAIN", &ag) &&
!decode_peak(demuxer, "REPLAYGAIN_ALBUM_PEAK", &ap))
{
struct replaygain_data *rgain = talloc_ptrtype(demuxer, rgain);
rgain->track_gain = tg;
rgain->track_peak = tp;
rgain->album_gain = ag;
rgain->album_peak = ap;
for (int n = 0; n < demuxer->num_streams; n++) {
struct sh_stream *sh = demuxer->streams[n];
if (sh->audio && !sh->audio->replaygain_data)
sh->audio->replaygain_data = rgain;
}
}
}
// Copy all fields from src to dst, depending on event flags.
static void demux_copy(struct demuxer *dst, struct demuxer *src)
{
if (src->events & DEMUX_EVENT_INIT) {
// Note that we do as shallow copies as possible. We expect the date
// that is not-copied (only referenced) to be immutable.
// This implies e.g. that no chapters are added after initialization.
dst->chapters = src->chapters;
dst->num_chapters = src->num_chapters;
dst->editions = src->editions;
dst->num_editions = src->num_editions;
dst->edition = src->edition;
dst->attachments = src->attachments;
dst->num_attachments = src->num_attachments;
dst->matroska_data = src->matroska_data;
dst->file_contents = src->file_contents;
dst->playlist = src->playlist;
dst->seekable = src->seekable;
dst->filetype = src->filetype;
dst->ts_resets_possible = src->ts_resets_possible;
dst->start_time = src->start_time;
}
if (src->events & DEMUX_EVENT_STREAMS) {
// The stream structs themselves are immutable.
for (int n = dst->num_streams; n < src->num_streams; n++)
MP_TARRAY_APPEND(dst, dst->streams, dst->num_streams, src->streams[n]);
}
if (src->events & DEMUX_EVENT_METADATA) {
talloc_free(dst->metadata);
dst->metadata = mp_tags_dup(dst, src->metadata);
}
dst->events |= src->events;
src->events = 0;
}
// This is called by demuxer implementations if certain parameters change
// at runtime.
// events is one of DEMUX_EVENT_*
// The code will copy the fields references by the events to the user-thread.
void demux_changed(demuxer_t *demuxer, int events)
{
assert(demuxer == demuxer->in->d_thread); // call from demuxer impl. only
struct demux_internal *in = demuxer->in;
demuxer->events |= events;
pthread_mutex_lock(&in->lock);
update_cache(in);
if (demuxer->events & DEMUX_EVENT_INIT)
demuxer_sort_chapters(demuxer);
if (demuxer->events & (DEMUX_EVENT_METADATA | DEMUX_EVENT_STREAMS))
demux_export_replaygain(demuxer);
demux_copy(in->d_buffer, demuxer);
pthread_mutex_unlock(&in->lock);
}
// Called by the user thread (i.e. player) to update metadata and other things
// from the demuxer thread.
void demux_update(demuxer_t *demuxer)
{
assert(demuxer == demuxer->in->d_user);
struct demux_internal *in = demuxer->in;
pthread_mutex_lock(&in->lock);
if (!in->threading)
update_cache(in);
demux_copy(demuxer, in->d_buffer);
if (in->stream_metadata && (demuxer->events & DEMUX_EVENT_METADATA))
mp_tags_merge(demuxer->metadata, in->stream_metadata);
pthread_mutex_unlock(&in->lock);
}
static struct demuxer *open_given_type(struct mpv_global *global,
struct mp_log *log,
const struct demuxer_desc *desc,
struct stream *stream,
struct demuxer_params *params,
enum demux_check check)
{
struct demuxer *demuxer = talloc_ptrtype(NULL, demuxer);
*demuxer = (struct demuxer) {
.desc = desc,
.type = desc->type,
.stream = stream,
.seekable = stream->seekable,
.filepos = -1,
.opts = global->opts,
.global = global,
.log = mp_log_new(demuxer, log, desc->name),
.glog = log,
.filename = talloc_strdup(demuxer, stream->url),
.events = DEMUX_EVENT_ALL,
};
demuxer->seekable = stream->seekable;
if (demuxer->stream->uncached_stream &&
!demuxer->stream->uncached_stream->seekable)
demuxer->seekable = false;
struct demux_internal *in = demuxer->in = talloc_ptrtype(demuxer, in);
*in = (struct demux_internal){
.log = demuxer->log,
.d_thread = talloc(demuxer, struct demuxer),
.d_buffer = talloc(demuxer, struct demuxer),
.d_user = demuxer,
.min_secs = demuxer->opts->demuxer_min_secs,
.min_packs = demuxer->opts->demuxer_min_packs,
.min_bytes = demuxer->opts->demuxer_min_bytes,
};
pthread_mutex_init(&in->lock, NULL);
pthread_cond_init(&in->wakeup, NULL);
*in->d_thread = *demuxer;
*in->d_buffer = *demuxer;
in->d_thread->metadata = talloc_zero(in->d_thread, struct mp_tags);
in->d_user->metadata = talloc_zero(in->d_user, struct mp_tags);
in->d_buffer->metadata = talloc_zero(in->d_buffer, struct mp_tags);
int64_t start_pos = stream_tell(stream);
mp_verbose(log, "Trying demuxer: %s (force-level: %s)\n",
desc->name, d_level(check));
in->d_thread->params = params; // temporary during open()
int ret = demuxer->desc->open(in->d_thread, check);
if (ret >= 0) {
in->d_thread->params = NULL;
if (in->d_thread->filetype)
mp_verbose(log, "Detected file format: %s (%s)\n",
in->d_thread->filetype, desc->desc);
else
mp_verbose(log, "Detected file format: %s\n", desc->desc);
// Pretend we can seek if we can't seek, but there's a cache.
if (!in->d_thread->seekable && stream->uncached_stream) {
mp_warn(log,
"File is not seekable, but there's a cache: enabling seeking.\n");
in->d_thread->seekable = true;
}
demux_changed(in->d_thread, DEMUX_EVENT_ALL);
demux_update(demuxer);
return demuxer;
}
free_demuxer(demuxer);
stream_seek(stream, start_pos);
return NULL;
}
static const int d_normal[] = {DEMUX_CHECK_NORMAL, DEMUX_CHECK_UNSAFE, -1};
static const int d_request[] = {DEMUX_CHECK_REQUEST, -1};
static const int d_force[] = {DEMUX_CHECK_FORCE, -1};
struct demuxer *demux_open(struct stream *stream, char *force_format,
struct demuxer_params *params,
struct mpv_global *global)
{
const int *check_levels = d_normal;
const struct demuxer_desc *check_desc = NULL;
struct mp_log *log = mp_log_new(NULL, global->log, "!demux");
struct demuxer *demuxer = NULL;
if (!force_format)
force_format = stream->demuxer;
if (force_format && force_format[0]) {
check_levels = d_request;
if (force_format[0] == '+') {
force_format += 1;
check_levels = d_force;
}
for (int n = 0; demuxer_list[n]; n++) {
if (strcmp(demuxer_list[n]->name, force_format) == 0)
check_desc = demuxer_list[n];
}
if (!check_desc) {
mp_err(log, "Demuxer %s does not exist.\n", force_format);
goto done;
}
}
// Peek this much data to avoid that stream_read() run by some demuxers
// or stream filters will flush previous peeked data.
stream_peek(stream, STREAM_BUFFER_SIZE);
// Test demuxers from first to last, one pass for each check_levels[] entry
for (int pass = 0; check_levels[pass] != -1; pass++) {
enum demux_check level = check_levels[pass];
for (int n = 0; demuxer_list[n]; n++) {
const struct demuxer_desc *desc = demuxer_list[n];
if (!check_desc || desc == check_desc) {
demuxer = open_given_type(global, log, desc, stream, params, level);
if (demuxer) {
talloc_steal(demuxer, log);
log = NULL;
goto done;
}
}
}
}
done:
talloc_free(log);
return demuxer;
}
static void flush_locked(demuxer_t *demuxer)
{
for (int n = 0; n < demuxer->num_streams; n++)
ds_flush(demuxer->streams[n]->ds);
demuxer->in->warned_queue_overflow = false;
demuxer->in->eof = false;
demuxer->in->last_eof = false;
}
// clear the packet queues
void demux_flush(demuxer_t *demuxer)
{
pthread_mutex_lock(&demuxer->in->lock);
flush_locked(demuxer);
pthread_mutex_unlock(&demuxer->in->lock);
}
int demux_seek(demuxer_t *demuxer, float rel_seek_secs, int flags)
{
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
if (!demuxer->seekable) {
MP_WARN(demuxer, "Cannot seek in this file.\n");
return 0;
}
if (rel_seek_secs == MP_NOPTS_VALUE && (flags & SEEK_ABSOLUTE))
return 0;
pthread_mutex_lock(&in->lock);
flush_locked(demuxer);
in->seeking = true;
in->seek_flags = flags;
in->seek_pts = rel_seek_secs;
if (!in->threading)
execute_seek(in);
pthread_cond_signal(&in->wakeup);
pthread_mutex_unlock(&in->lock);
return 1;
}
char *demux_info_get(demuxer_t *demuxer, const char *opt)
{
return mp_tags_get_str(demuxer->metadata, opt);
}
struct sh_stream *demuxer_stream_by_demuxer_id(struct demuxer *d,
enum stream_type t, int id)
{
for (int n = 0; n < d->num_streams; n++) {
struct sh_stream *s = d->streams[n];
if (s->type == t && s->demuxer_id == id)
return d->streams[n];
}
return NULL;
}
void demuxer_switch_track(struct demuxer *demuxer, enum stream_type type,
struct sh_stream *stream)
{
assert(!stream || stream->type == type);
for (int n = 0; n < demuxer->num_streams; n++) {
struct sh_stream *cur = demuxer->streams[n];
if (cur->type == type)
demuxer_select_track(demuxer, cur, cur == stream);
}
}
void demuxer_select_track(struct demuxer *demuxer, struct sh_stream *stream,
bool selected)
{
// don't flush buffers if stream is already selected / unselected
pthread_mutex_lock(&demuxer->in->lock);
bool update = false;
if (stream->ds->selected != selected) {
stream->ds->selected = selected;
stream->ds->active = false;
ds_flush(stream->ds);
update = true;
}
pthread_mutex_unlock(&demuxer->in->lock);
if (update)
demux_control(demuxer, DEMUXER_CTRL_SWITCHED_TRACKS, NULL);
}
void demux_set_stream_autoselect(struct demuxer *demuxer, bool autoselect)
{
assert(!demuxer->in->threading); // laziness
demuxer->in->autoselect = autoselect;
}
bool demux_stream_is_selected(struct sh_stream *stream)
{
if (!stream)
return false;
bool r = false;
pthread_mutex_lock(&stream->ds->in->lock);
r = stream->ds->selected;
pthread_mutex_unlock(&stream->ds->in->lock);
return r;
}
int demuxer_add_attachment(demuxer_t *demuxer, struct bstr name,
struct bstr type, struct bstr data)
{
if (!(demuxer->num_attachments % 32))
demuxer->attachments = talloc_realloc(demuxer, demuxer->attachments,
struct demux_attachment,
demuxer->num_attachments + 32);
struct demux_attachment *att =
demuxer->attachments + demuxer->num_attachments;
att->name = talloc_strndup(demuxer->attachments, name.start, name.len);
att->type = talloc_strndup(demuxer->attachments, type.start, type.len);
att->data = talloc_size(demuxer->attachments, data.len);
memcpy(att->data, data.start, data.len);
att->data_size = data.len;
return demuxer->num_attachments++;
}
static int chapter_compare(const void *p1, const void *p2)
{
struct demux_chapter *c1 = (void *)p1;
struct demux_chapter *c2 = (void *)p2;
if (c1->start > c2->start)
return 1;
else if (c1->start < c2->start)
return -1;
return c1->original_index > c2->original_index ? 1 :-1; // never equal
}
static void demuxer_sort_chapters(demuxer_t *demuxer)
{
qsort(demuxer->chapters, demuxer->num_chapters,
sizeof(struct demux_chapter), chapter_compare);
}
int demuxer_add_chapter(demuxer_t *demuxer, struct bstr name,
uint64_t start, uint64_t end, uint64_t demuxer_id)
{
struct demux_chapter new = {
.original_index = demuxer->num_chapters,
.start = start,
.end = end,
.name = name.len ? bstrdup0(demuxer, name) : NULL,
.metadata = talloc_zero(demuxer, struct mp_tags),
.demuxer_id = demuxer_id,
};
mp_tags_set_bstr(new.metadata, bstr0("TITLE"), name);
MP_TARRAY_APPEND(demuxer, demuxer->chapters, demuxer->num_chapters, new);
return demuxer->num_chapters - 1;
}
double demuxer_get_time_length(struct demuxer *demuxer)
{
double len;
if (demux_control(demuxer, DEMUXER_CTRL_GET_TIME_LENGTH, &len) > 0)
return len;
return -1;
}
// must be called locked
static void update_cache(struct demux_internal *in)
{
struct demuxer *demuxer = in->d_thread;
struct stream *stream = demuxer->stream;
in->time_length = -1;
if (demuxer->desc->control) {
demuxer->desc->control(demuxer, DEMUXER_CTRL_GET_TIME_LENGTH,
&in->time_length);
}
struct mp_tags *s_meta = NULL;
stream_control(stream, STREAM_CTRL_GET_METADATA, &s_meta);
if (s_meta) {
talloc_free(in->stream_metadata);
in->stream_metadata = talloc_steal(in, s_meta);
in->d_buffer->events |= DEMUX_EVENT_METADATA;
}
in->stream_size = -1;
stream_control(stream, STREAM_CTRL_GET_SIZE, &in->stream_size);
in->stream_cache_size = -1;
stream_control(stream, STREAM_CTRL_GET_CACHE_SIZE, &in->stream_cache_size);
in->stream_cache_fill = -1;
stream_control(stream, STREAM_CTRL_GET_CACHE_FILL, &in->stream_cache_fill);
in->stream_cache_idle = -1;
stream_control(stream, STREAM_CTRL_GET_CACHE_IDLE, &in->stream_cache_idle);
}
// must be called locked
static int cached_stream_control(struct demux_internal *in, int cmd, void *arg)
{
switch (cmd) {
case STREAM_CTRL_GET_CACHE_SIZE:
if (in->stream_cache_size < 0)
return STREAM_UNSUPPORTED;
*(int64_t *)arg = in->stream_cache_size;
return STREAM_OK;
case STREAM_CTRL_GET_CACHE_FILL:
if (in->stream_cache_fill < 0)
return STREAM_UNSUPPORTED;
*(int64_t *)arg = in->stream_cache_fill;
return STREAM_OK;
case STREAM_CTRL_GET_CACHE_IDLE:
if (in->stream_cache_idle < 0)
return STREAM_UNSUPPORTED;
*(int *)arg = in->stream_cache_idle;
return STREAM_OK;
case STREAM_CTRL_GET_SIZE:
if (in->stream_size < 0)
return STREAM_UNSUPPORTED;
*(int64_t *)arg = in->stream_size;
return STREAM_OK;
}
return STREAM_ERROR;
}
// must be called locked
static int cached_demux_control(struct demux_internal *in, int cmd, void *arg)
{
switch (cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (in->time_length < 0)
return DEMUXER_CTRL_NOTIMPL;
*(double *)arg = in->time_length;
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_STREAM_CTRL: {
struct demux_ctrl_stream_ctrl *c = arg;
int r = cached_stream_control(in, c->ctrl, c->arg);
if (r == STREAM_ERROR)
break;
c->res = r;
return DEMUXER_CTRL_OK;
}
case DEMUXER_CTRL_SWITCHED_TRACKS:
in->tracks_switched = true;
return DEMUXER_CTRL_OK;
}
return DEMUXER_CTRL_DONTKNOW;
}
int demux_control(demuxer_t *demuxer, int cmd, void *arg)
{
struct demux_internal *in = demuxer->in;
if (in->threading) {
pthread_mutex_lock(&in->lock);
pthread_cond_signal(&in->wakeup);
int cr = cached_demux_control(in, cmd, arg);
pthread_mutex_unlock(&in->lock);
if (cr != DEMUXER_CTRL_DONTKNOW)
return cr;
}
int r = DEMUXER_CTRL_NOTIMPL;
demux_pause(demuxer);
if (cmd == DEMUXER_CTRL_STREAM_CTRL) {
struct demux_ctrl_stream_ctrl *c = arg;
if (in->threading)
MP_VERBOSE(demuxer, "blocking for STREAM_CTRL %d\n", c->ctrl);
c->res = stream_control(demuxer->stream, c->ctrl, c->arg);
if (c->res != STREAM_UNSUPPORTED)
r = DEMUXER_CTRL_OK;
}
if (r != DEMUXER_CTRL_OK) {
if (in->threading)
MP_VERBOSE(demuxer, "blocking for DEMUXER_CTRL %d\n", cmd);
if (demuxer->desc->control)
r = demuxer->desc->control(demuxer->in->d_thread, cmd, arg);
}
demux_unpause(demuxer);
return r;
}
int demux_stream_control(demuxer_t *demuxer, int ctrl, void *arg)
{
struct demux_ctrl_stream_ctrl c = {ctrl, arg, STREAM_UNSUPPORTED};
demux_control(demuxer, DEMUXER_CTRL_STREAM_CTRL, &c);
return c.res;
}
// Make the demuxer thread stop doing anything.
// demux_unpause() wakes up the thread again.
// Can be nested with other calls, but trying to read packets may deadlock.
void demux_pause(demuxer_t *demuxer)
{
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
if (!in->threading)
return;
MP_VERBOSE(in, "pause demux thread\n");
pthread_mutex_lock(&in->lock);
in->thread_request_pause++;
pthread_cond_signal(&in->wakeup);
while (!in->thread_paused)
pthread_cond_wait(&in->wakeup, &in->lock);
pthread_mutex_unlock(&in->lock);
}
void demux_unpause(demuxer_t *demuxer)
{
struct demux_internal *in = demuxer->in;
assert(demuxer == in->d_user);
if (!in->threading)
return;
pthread_mutex_lock(&in->lock);
assert(in->thread_request_pause > 0);
in->thread_request_pause--;
pthread_cond_signal(&in->wakeup);
pthread_mutex_unlock(&in->lock);
}
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