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mpv/demux/demux_lavf.c

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/*
* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <limits.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <assert.h>
#include "config.h"
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/avutil.h>
#include <libavutil/avstring.h>
#include <libavutil/mathematics.h>
#include <libavutil/replaygain.h>
#include <libavutil/display.h>
#include <libavutil/opt.h>
#include "common/msg.h"
#include "common/tags.h"
#include "common/av_common.h"
#include "misc/bstr.h"
#include "misc/charset_conv.h"
#include "misc/thread_tools.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "options/path.h"
#ifndef AV_DISPOSITION_TIMED_THUMBNAILS
#define AV_DISPOSITION_TIMED_THUMBNAILS 0
#endif
#ifndef AV_DISPOSITION_STILL_IMAGE
#define AV_DISPOSITION_STILL_IMAGE 0
#endif
#define INITIAL_PROBE_SIZE STREAM_BUFFER_SIZE
#define PROBE_BUF_SIZE (10 * 1024 * 1024)
// Should correspond to IO_BUFFER_SIZE in libavformat/aviobuf.c (not public)
// libavformat (almost) always reads data in blocks of this size.
#define BIO_BUFFER_SIZE 32768
#define OPT_BASE_STRUCT struct demux_lavf_opts
struct demux_lavf_opts {
int probesize;
int probeinfo;
int probescore;
float analyzeduration;
int buffersize;
int allow_mimetype;
char *format;
char **avopts;
int hacks;
char *sub_cp;
int rtsp_transport;
int linearize_ts;
};
const struct m_sub_options demux_lavf_conf = {
.opts = (const m_option_t[]) {
OPT_INTRANGE("demuxer-lavf-probesize", probesize, 0, 32, INT_MAX),
OPT_CHOICE("demuxer-lavf-probe-info", probeinfo, 0,
({"no", 0}, {"yes", 1}, {"auto", -1}, {"nostreams", -2})),
OPT_STRING("demuxer-lavf-format", format, 0),
OPT_FLOATRANGE("demuxer-lavf-analyzeduration", analyzeduration, 0,
0, 3600),
OPT_INTRANGE("demuxer-lavf-buffersize", buffersize, 0, 1,
10 * 1024 * 1024, OPTDEF_INT(BIO_BUFFER_SIZE)),
OPT_FLAG("demuxer-lavf-allow-mimetype", allow_mimetype, 0),
OPT_INTRANGE("demuxer-lavf-probescore", probescore, 0,
1, AVPROBE_SCORE_MAX),
OPT_FLAG("demuxer-lavf-hacks", hacks, 0),
OPT_KEYVALUELIST("demuxer-lavf-o", avopts, 0),
OPT_STRING("sub-codepage", sub_cp, 0),
OPT_CHOICE("rtsp-transport", rtsp_transport, 0,
({"lavf", 0},
{"udp", 1},
{"tcp", 2},
{"http", 3})),
OPT_CHOICE("demuxer-lavf-linearize-timestamps", linearize_ts, 0,
({"no", 0}, {"auto", -1}, {"yes", 1})),
{0}
},
.size = sizeof(struct demux_lavf_opts),
.defaults = &(const struct demux_lavf_opts){
.probeinfo = -1,
.allow_mimetype = 1,
.hacks = 1,
// AVPROBE_SCORE_MAX/4 + 1 is the "recommended" limit. Below that, the
// user is supposed to retry with larger probe sizes until a higher
// value is reached.
.probescore = AVPROBE_SCORE_MAX/4 + 1,
.sub_cp = "auto",
.rtsp_transport = 2,
.linearize_ts = -1,
},
};
struct format_hack {
const char *ff_name;
const char *mime_type;
int probescore;
float analyzeduration;
bool skipinfo : 1; // skip avformat_find_stream_info()
unsigned int if_flags; // additional AVInputFormat.flags flags
bool max_probe : 1; // use probescore only if max. probe size reached
bool ignore : 1; // blacklisted
bool no_stream : 1; // do not wrap struct stream as AVIOContext
bool use_stream_ids : 1; // export the native stream IDs
bool fully_read : 1; // set demuxer.fully_read flag
bool detect_charset : 1; // format is a small text file, possibly not UTF8
bool image_format : 1; // expected to contain exactly 1 frame
// Do not confuse player's position estimation (position is into external
// segment, with e.g. HLS, player knows about the playlist main file only).
bool clear_filepos : 1;
bool linearize_audio_ts : 1;// compensate timestamp resets (audio only)
bool fix_editlists : 1;
bool is_network : 1;
bool no_seek : 1;
bool no_pcm_seek : 1;
};
#define BLACKLIST(fmt) {fmt, .ignore = true}
#define TEXTSUB(fmt) {fmt, .fully_read = true, .detect_charset = true}
#define TEXTSUB_UTF8(fmt) {fmt, .fully_read = true}
static const struct format_hack format_hacks[] = {
// for webradios
{"aac", "audio/aacp", 25, 0.5},
{"aac", "audio/aac", 25, 0.5},
// some mp3 files don't detect correctly (usually id3v2 too large)
{"mp3", "audio/mpeg", 24, 0.5},
{"mp3", NULL, 24, .max_probe = true},
{"hls", .no_stream = true, .clear_filepos = true},
{"dash", .no_stream = true, .clear_filepos = true},
{"sdp", .clear_filepos = true, .is_network = true, .no_seek = true},
{"mpeg", .use_stream_ids = true},
{"mpegts", .use_stream_ids = true},
{"mp4", .skipinfo = true, .fix_editlists = true, .no_pcm_seek = true},
{"matroska", .skipinfo = true, .no_pcm_seek = true},
{"v4l2", .no_seek = true},
// In theory, such streams might contain timestamps, but virtually none do.
{"h264", .if_flags = AVFMT_NOTIMESTAMPS },
{"hevc", .if_flags = AVFMT_NOTIMESTAMPS },
// Some Ogg shoutcast streams are essentially concatenated OGG files. They
// reset timestamps, which causes all sorts of problems.
{"ogg", .linearize_audio_ts = true},
TEXTSUB("aqtitle"), TEXTSUB("jacosub"), TEXTSUB("microdvd"),
TEXTSUB("mpl2"), TEXTSUB("mpsub"), TEXTSUB("pjs"), TEXTSUB("realtext"),
TEXTSUB("sami"), TEXTSUB("srt"), TEXTSUB("stl"), TEXTSUB("subviewer"),
TEXTSUB("subviewer1"), TEXTSUB("vplayer"), TEXTSUB("ass"),
TEXTSUB_UTF8("webvtt"),
// Useless non-sense, sometimes breaks MLP2 subreader.c fallback
BLACKLIST("tty"),
// Let's open files with extremely generic extensions (.bin) with a
// demuxer that doesn't have a probe function! NO.
BLACKLIST("bin"),
// Useless, does not work with custom streams.
BLACKLIST("image2"),
// Image demuxers ("<name>_pipe" is detected explicitly)
{"image2pipe", .image_format = true},
{0}
};
struct nested_stream {
AVIOContext *id;
int64_t last_bytes;
};
struct stream_info {
struct sh_stream *sh;
double last_key_pts;
double highest_pts;
double ts_offset;
};
typedef struct lavf_priv {
struct stream *stream;
bool own_stream;
char *filename;
struct format_hack format_hack;
AVInputFormat *avif;
int avif_flags;
AVFormatContext *avfc;
AVIOContext *pb;
struct stream_info **streams; // NULL for unknown streams
int num_streams;
char *mime_type;
double seek_delay;
struct demux_lavf_opts *opts;
double mf_fps;
bool pcm_seek_hack_disabled;
AVStream *pcm_seek_hack;
int pcm_seek_hack_packet_size;
int linearize_ts;
bool any_ts_fixed;
// Proxying nested streams.
struct nested_stream *nested;
int num_nested;
int (*default_io_open)(struct AVFormatContext *s, AVIOContext **pb,
const char *url, int flags, AVDictionary **options);
void (*default_io_close)(struct AVFormatContext *s, AVIOContext *pb);
} lavf_priv_t;
static void update_read_stats(struct demuxer *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
for (int n = 0; n < priv->num_nested; n++) {
struct nested_stream *nest = &priv->nested[n];
// Note: accessing the bytes_read field is not allowed by FFmpeg's API.
// This is fully intentional - there is no other way to get this
// information (not even by custom I/O, because the connection reuse
// mechanism by the HLS demuxer would get disabled).
int64_t cur = nest->id->bytes_read;
int64_t new = cur - nest->last_bytes;
nest->last_bytes = cur;
demux_report_unbuffered_read_bytes(demuxer, new);
}
}
// At least mp4 has name="mov,mp4,m4a,3gp,3g2,mj2", so we split the name
// on "," in general.
static bool matches_avinputformat_name(struct lavf_priv *priv,
const char *name)
{
const char *avifname = priv->avif->name;
while (1) {
const char *next = strchr(avifname, ',');
if (!next)
return !strcmp(avifname, name);
int len = next - avifname;
if (len == strlen(name) && !memcmp(avifname, name, len))
return true;
avifname = next + 1;
}
}
static int mp_read(void *opaque, uint8_t *buf, int size)
{
struct demuxer *demuxer = opaque;
lavf_priv_t *priv = demuxer->priv;
struct stream *stream = priv->stream;
int ret = stream_read_partial(stream, buf, size);
MP_TRACE(demuxer, "%d=mp_read(%p, %p, %d), pos: %"PRId64", eof:%d\n",
ret, stream, buf, size, stream_tell(stream), stream->eof);
return ret ? ret : AVERROR_EOF;
}
static int64_t mp_seek(void *opaque, int64_t pos, int whence)
{
struct demuxer *demuxer = opaque;
lavf_priv_t *priv = demuxer->priv;
struct stream *stream = priv->stream;
MP_TRACE(demuxer, "mp_seek(%p, %"PRId64", %s)\n", stream, pos,
whence == SEEK_END ? "end" :
whence == SEEK_CUR ? "cur" :
whence == SEEK_SET ? "set" : "size");
if (whence == SEEK_END || whence == AVSEEK_SIZE) {
int64_t end = stream_get_size(stream);
if (end < 0)
return -1;
if (whence == AVSEEK_SIZE)
return end;
pos += end;
} else if (whence == SEEK_CUR) {
pos += stream_tell(stream);
} else if (whence != SEEK_SET) {
return -1;
}
if (pos < 0)
return -1;
int64_t current_pos = stream_tell(stream);
if (stream_seek(stream, pos) == 0) {
stream_seek(stream, current_pos);
return -1;
}
return pos;
}
static int64_t mp_read_seek(void *opaque, int stream_idx, int64_t ts, int flags)
{
struct demuxer *demuxer = opaque;
lavf_priv_t *priv = demuxer->priv;
struct stream *stream = priv->stream;
struct stream_avseek cmd = {
.stream_index = stream_idx,
.timestamp = ts,
.flags = flags,
};
if (stream_control(stream, STREAM_CTRL_AVSEEK, &cmd) == STREAM_OK) {
stream_drop_buffers(stream);
return 0;
}
return AVERROR(ENOSYS);
}
static void list_formats(struct demuxer *demuxer)
{
MP_INFO(demuxer, "Available lavf input formats:\n");
const AVInputFormat *fmt;
void *iter = NULL;
while ((fmt = av_demuxer_iterate(&iter)))
MP_INFO(demuxer, "%15s : %s\n", fmt->name, fmt->long_name);
}
static void convert_charset(struct demuxer *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
char *cp = priv->opts->sub_cp;
if (!cp || mp_charset_is_utf8(cp))
return;
bstr data = stream_read_complete(priv->stream, NULL, 128 * 1024 * 1024);
if (!data.start) {
MP_WARN(demuxer, "File too big (or error reading) - skip charset probing.\n");
return;
}
void *alloc = data.start;
cp = (char *)mp_charset_guess(priv, demuxer->log, data, cp, 0);
if (cp && !mp_charset_is_utf8(cp))
MP_INFO(demuxer, "Using subtitle charset: %s\n", cp);
// libavformat transparently converts UTF-16 to UTF-8
if (!mp_charset_is_utf16(cp) && !mp_charset_is_utf8(cp)) {
bstr conv = mp_iconv_to_utf8(demuxer->log, data, cp, MP_ICONV_VERBOSE);
if (conv.start && conv.start != data.start)
talloc_steal(alloc, conv.start);
if (conv.start)
data = conv;
}
if (data.start) {
priv->stream = stream_memory_open(demuxer->global, data.start, data.len);
priv->own_stream = true;
}
talloc_free(alloc);
}
static char *remove_prefix(char *s, const char *const *prefixes)
{
for (int n = 0; prefixes[n]; n++) {
int len = strlen(prefixes[n]);
if (strncmp(s, prefixes[n], len) == 0)
return s + len;
}
return s;
}
static const char *const prefixes[] =
{"ffmpeg://", "lavf://", "avdevice://", "av://", NULL};
static int lavf_check_file(demuxer_t *demuxer, enum demux_check check)
{
lavf_priv_t *priv = demuxer->priv;
struct demux_lavf_opts *lavfdopts = priv->opts;
struct stream *s = priv->stream;
priv->filename = remove_prefix(s->url, prefixes);
char *avdevice_format = NULL;
if (s->info && strcmp(s->info->name, "avdevice") == 0) {
// always require filename in the form "format:filename"
char *sep = strchr(priv->filename, ':');
if (!sep) {
MP_FATAL(demuxer, "Must specify filename in 'format:filename' form\n");
return -1;
}
avdevice_format = talloc_strndup(priv, priv->filename,
sep - priv->filename);
priv->filename = sep + 1;
}
char *mime_type = s->mime_type;
if (!lavfdopts->allow_mimetype || !mime_type)
mime_type = "";
AVInputFormat *forced_format = NULL;
const char *format = lavfdopts->format;
if (!format)
format = s->lavf_type;
if (!format)
format = avdevice_format;
if (format) {
if (strcmp(format, "help") == 0) {
list_formats(demuxer);
return -1;
}
forced_format = av_find_input_format(format);
if (!forced_format) {
MP_FATAL(demuxer, "Unknown lavf format %s\n", format);
return -1;
}
}
AVProbeData avpd = {
// Disable file-extension matching with normal checks
.filename = priv->filename,
.buf_size = 0,
.buf = av_mallocz(PROBE_BUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE),
};
if (!avpd.buf)
return -1;
bool final_probe = false;
do {
int score = 0;
if (forced_format) {
priv->avif = forced_format;
score = AVPROBE_SCORE_MAX;
} else {
int nsize = av_clip(avpd.buf_size * 2, INITIAL_PROBE_SIZE,
PROBE_BUF_SIZE);
bstr buf = stream_peek(s, nsize);
if (buf.len <= avpd.buf_size)
final_probe = true;
memcpy(avpd.buf, buf.start, buf.len);
avpd.buf_size = buf.len;
priv->avif = av_probe_input_format2(&avpd, avpd.buf_size > 0, &score);
}
if (priv->avif) {
MP_VERBOSE(demuxer, "Found '%s' at score=%d size=%d%s.\n",
priv->avif->name, score, avpd.buf_size,
forced_format ? " (forced)" : "");
for (int n = 0; lavfdopts->hacks && format_hacks[n].ff_name; n++) {
const struct format_hack *entry = &format_hacks[n];
if (!matches_avinputformat_name(priv, entry->ff_name))
continue;
if (entry->mime_type && strcasecmp(entry->mime_type, mime_type) != 0)
continue;
priv->format_hack = *entry;
break;
}
if (score >= lavfdopts->probescore)
break;
if (priv->format_hack.probescore &&
score >= priv->format_hack.probescore &&
(!priv->format_hack.max_probe || final_probe))
break;
}
priv->avif = NULL;
priv->format_hack = (struct format_hack){0};
} while (!final_probe);
av_free(avpd.buf);
if (priv->avif && !forced_format && priv->format_hack.ignore) {
MP_VERBOSE(demuxer, "Format blacklisted.\n");
priv->avif = NULL;
}
if (!priv->avif) {
MP_VERBOSE(demuxer, "No format found, try lowering probescore or forcing the format.\n");
return -1;
}
if (bstr_endswith0(bstr0(priv->avif->name), "_pipe")) {
MP_VERBOSE(demuxer, "Assuming this is an image format.\n");
priv->format_hack.image_format = true;
}
if (lavfdopts->hacks)
priv->avif_flags = priv->avif->flags | priv->format_hack.if_flags;
priv->linearize_ts = lavfdopts->linearize_ts;
if (priv->linearize_ts < 0 && !priv->format_hack.linearize_audio_ts)
priv->linearize_ts = 0;
demuxer->filetype = priv->avif->name;
if (priv->format_hack.detect_charset)
convert_charset(demuxer);
return 0;
}
static char *replace_idx_ext(void *ta_ctx, bstr f)
{
if (f.len < 4 || f.start[f.len - 4] != '.')
return NULL;
char *ext = bstr_endswith0(f, "IDX") ? "SUB" : "sub"; // match case
return talloc_asprintf(ta_ctx, "%.*s.%s", BSTR_P(bstr_splice(f, 0, -4)), ext);
}
static void guess_and_set_vobsub_name(struct demuxer *demuxer, AVDictionary **d)
{
lavf_priv_t *priv = demuxer->priv;
if (!matches_avinputformat_name(priv, "vobsub"))
return;
void *tmp = talloc_new(NULL);
bstr bfilename = bstr0(priv->filename);
char *subname = NULL;
if (mp_is_url(bfilename)) {
// It might be a http URL, which has additional parameters after the
// end of the actual file path.
bstr start, end;
if (bstr_split_tok(bfilename, "?", &start, &end)) {
subname = replace_idx_ext(tmp, start);
if (subname)
subname = talloc_asprintf(tmp, "%s?%.*s", subname, BSTR_P(end));
}
}
if (!subname)
subname = replace_idx_ext(tmp, bfilename);
if (!subname)
subname = talloc_asprintf(tmp, "%.*s.sub", BSTR_P(bfilename));
MP_VERBOSE(demuxer, "Assuming associated .sub file: %s\n", subname);
av_dict_set(d, "sub_name", subname, 0);
talloc_free(tmp);
}
static void select_tracks(struct demuxer *demuxer, int start)
{
lavf_priv_t *priv = demuxer->priv;
for (int n = start; n < priv->num_streams; n++) {
struct sh_stream *stream = priv->streams[n]->sh;
AVStream *st = priv->avfc->streams[n];
bool selected = stream && demux_stream_is_selected(stream) &&
!stream->attached_picture;
st->discard = selected ? AVDISCARD_DEFAULT : AVDISCARD_ALL;
}
}
static void export_replaygain(demuxer_t *demuxer, struct sh_stream *sh,
AVStream *st)
{
for (int i = 0; i < st->nb_side_data; i++) {
AVReplayGain *av_rgain;
struct replaygain_data *rgain;
AVPacketSideData *src_sd = &st->side_data[i];
if (src_sd->type != AV_PKT_DATA_REPLAYGAIN)
continue;
av_rgain = (AVReplayGain*)src_sd->data;
rgain = talloc_ptrtype(demuxer, rgain);
// Set values in *rgain, using track gain as a fallback for album gain
// if the latter is not present. This behavior matches that in
// demux/demux.c's decode_rgain; if you change this, please make
// equivalent changes there too.
if (av_rgain->track_gain != INT32_MIN && av_rgain->track_peak != 0.0) {
// Track gain is defined.
rgain->track_gain = av_rgain->track_gain / 100000.0f;
rgain->track_peak = av_rgain->track_peak / 100000.0f;
if (av_rgain->album_gain != INT32_MIN &&
av_rgain->album_peak != 0.0)
{
// Album gain is also defined.
rgain->album_gain = av_rgain->album_gain / 100000.0f;
rgain->album_peak = av_rgain->album_peak / 100000.0f;
} else {
// Album gain is undefined; fall back to track gain.
rgain->album_gain = rgain->track_gain;
rgain->album_peak = rgain->track_peak;
}
}
// This must be run only before the stream was added, otherwise there
// will be race conditions with accesses from the user thread.
assert(!sh->ds);
sh->codec->replaygain_data = rgain;
}
}
// Return a dictionary entry as (decimal) integer.
static int dict_get_decimal(AVDictionary *dict, const char *entry, int def)
{
AVDictionaryEntry *e = av_dict_get(dict, entry, NULL, 0);
if (e && e->value) {
char *end = NULL;
long int r = strtol(e->value, &end, 10);
if (end && !end[0] && r >= INT_MIN && r <= INT_MAX)
return r;
}
return def;
}
static void handle_new_stream(demuxer_t *demuxer, int i)
{
lavf_priv_t *priv = demuxer->priv;
AVFormatContext *avfc = priv->avfc;
AVStream *st = avfc->streams[i];
struct sh_stream *sh = NULL;
AVCodecParameters *codec = st->codecpar;
int lavc_delay = codec->initial_padding;
switch (codec->codec_type) {
case AVMEDIA_TYPE_AUDIO: {
sh = demux_alloc_sh_stream(STREAM_AUDIO);
// probably unneeded
mp_chmap_set_unknown(&sh->codec->channels, codec->channels);
if (codec->channel_layout)
mp_chmap_from_lavc(&sh->codec->channels, codec->channel_layout);
sh->codec->samplerate = codec->sample_rate;
sh->codec->bitrate = codec->bit_rate;
double delay = 0;
if (codec->sample_rate > 0)
delay = lavc_delay / (double)codec->sample_rate;
priv->seek_delay = MPMAX(priv->seek_delay, delay);
export_replaygain(demuxer, sh, st);
sh->seek_preroll = delay;
break;
}
case AVMEDIA_TYPE_VIDEO: {
sh = demux_alloc_sh_stream(STREAM_VIDEO);
if ((st->disposition & AV_DISPOSITION_ATTACHED_PIC) &&
!(st->disposition & AV_DISPOSITION_TIMED_THUMBNAILS))
{
sh->attached_picture =
new_demux_packet_from_avpacket(&st->attached_pic);
if (sh->attached_picture) {
sh->attached_picture->pts = 0;
talloc_steal(sh, sh->attached_picture);
sh->attached_picture->keyframe = true;
}
}
if (!sh->attached_picture) {
// A real video stream probably means it's a packet based format.
priv->pcm_seek_hack_disabled = true;
priv->pcm_seek_hack = NULL;
// Also, we don't want to do this shit for ogv videos.
if (priv->linearize_ts < 0)
priv->linearize_ts = 0;
}
sh->codec->disp_w = codec->width;
sh->codec->disp_h = codec->height;
if (st->avg_frame_rate.num)
sh->codec->fps = av_q2d(st->avg_frame_rate);
if (priv->format_hack.image_format)
sh->codec->fps = priv->mf_fps;
sh->codec->par_w = st->sample_aspect_ratio.num;
sh->codec->par_h = st->sample_aspect_ratio.den;
uint8_t *sd = av_stream_get_side_data(st, AV_PKT_DATA_DISPLAYMATRIX, NULL);
if (sd) {
double r = av_display_rotation_get((uint32_t *)sd);
if (!isnan(r))
sh->codec->rotate = (((int)(-r) % 360) + 360) % 360;
}
// This also applies to vfw-muxed mkv, but we can't detect these easily.
sh->codec->avi_dts = matches_avinputformat_name(priv, "avi");
break;
}
case AVMEDIA_TYPE_SUBTITLE: {
sh = demux_alloc_sh_stream(STREAM_SUB);
if (codec->extradata_size) {
sh->codec->extradata = talloc_size(sh, codec->extradata_size);
memcpy(sh->codec->extradata, codec->extradata, codec->extradata_size);
sh->codec->extradata_size = codec->extradata_size;
}
if (matches_avinputformat_name(priv, "microdvd")) {
AVRational r;
if (av_opt_get_q(avfc, "subfps", AV_OPT_SEARCH_CHILDREN, &r) >= 0) {
// File headers don't have a FPS set.
if (r.num < 1 || r.den < 1)
sh->codec->frame_based = 23.976; // default timebase
}
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT: {
AVDictionaryEntry *ftag = av_dict_get(st->metadata, "filename", NULL, 0);
char *filename = ftag ? ftag->value : NULL;
AVDictionaryEntry *mt = av_dict_get(st->metadata, "mimetype", NULL, 0);
char *mimetype = mt ? mt->value : NULL;
if (mimetype) {
demuxer_add_attachment(demuxer, filename, mimetype,
codec->extradata, codec->extradata_size);
}
break;
}
default: ;
}
struct stream_info *info = talloc_zero(priv, struct stream_info);
*info = (struct stream_info){
.sh = sh,
.last_key_pts = MP_NOPTS_VALUE,
.highest_pts = MP_NOPTS_VALUE,
};
assert(priv->num_streams == i); // directly mapped
MP_TARRAY_APPEND(priv, priv->streams, priv->num_streams, info);
if (sh) {
sh->ff_index = st->index;
sh->codec->codec = mp_codec_from_av_codec_id(codec->codec_id);
sh->codec->codec_tag = codec->codec_tag;
sh->codec->lav_codecpar = avcodec_parameters_alloc();
if (sh->codec->lav_codecpar)
avcodec_parameters_copy(sh->codec->lav_codecpar, codec);
sh->codec->native_tb_num = st->time_base.num;
sh->codec->native_tb_den = st->time_base.den;
if (st->disposition & AV_DISPOSITION_DEFAULT)
sh->default_track = true;
if (st->disposition & AV_DISPOSITION_FORCED)
sh->forced_track = true;
if (st->disposition & AV_DISPOSITION_DEPENDENT)
sh->dependent_track = true;
if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
sh->visual_impaired_track = true;
if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
sh->hearing_impaired_track = true;
if (st->disposition & AV_DISPOSITION_STILL_IMAGE)
sh->still_image = true;
if (priv->format_hack.use_stream_ids)
sh->demuxer_id = st->id;
AVDictionaryEntry *title = av_dict_get(st->metadata, "title", NULL, 0);
if (title && title->value)
sh->title = talloc_strdup(sh, title->value);
if (!sh->title && st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
sh->title = talloc_asprintf(sh, "visual impaired");
if (!sh->title && st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
sh->title = talloc_asprintf(sh, "hearing impaired");
AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
if (lang && lang->value && strcmp(lang->value, "und") != 0)
sh->lang = talloc_strdup(sh, lang->value);
sh->hls_bitrate = dict_get_decimal(st->metadata, "variant_bitrate", 0);
if (!sh->title && sh->hls_bitrate > 0)
sh->title = talloc_asprintf(sh, "bitrate %d", sh->hls_bitrate);
sh->missing_timestamps = !!(priv->avif_flags & AVFMT_NOTIMESTAMPS);
mp_tags_copy_from_av_dictionary(sh->tags, st->metadata);
demux_add_sh_stream(demuxer, sh);
// Unfortunately, there is no better way to detect PCM codecs, other
// than listing them all manually. (Or other "frameless" codecs. Or
// rather, codecs with frames so small libavformat will put multiple of
// them into a single packet, but not preserve these artificial packet
// boundaries on seeking.)
if (sh->codec->codec && strncmp(sh->codec->codec, "pcm_", 4) == 0 &&
codec->block_align && !priv->pcm_seek_hack_disabled &&
priv->opts->hacks && !priv->format_hack.no_pcm_seek &&
st->time_base.num == 1 && st->time_base.den == codec->sample_rate)
{
if (priv->pcm_seek_hack) {
// More than 1 audio stream => usually doesn't apply.
priv->pcm_seek_hack_disabled = true;
priv->pcm_seek_hack = NULL;
} else {
priv->pcm_seek_hack = st;
}
}
}
select_tracks(demuxer, i);
}
// Add any new streams that might have been added
static void add_new_streams(demuxer_t *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
while (priv->num_streams < priv->avfc->nb_streams)
handle_new_stream(demuxer, priv->num_streams);
}
static void update_metadata(demuxer_t *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
if (priv->avfc->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
mp_tags_copy_from_av_dictionary(demuxer->metadata, priv->avfc->metadata);
priv->avfc->event_flags = 0;
demux_metadata_changed(demuxer);
}
}
static int interrupt_cb(void *ctx)
{
struct demuxer *demuxer = ctx;
return mp_cancel_test(demuxer->cancel);
}
static int block_io_open(struct AVFormatContext *s, AVIOContext **pb,
const char *url, int flags, AVDictionary **options)
{
struct demuxer *demuxer = s->opaque;
MP_ERR(demuxer, "Not opening '%s' due to --access-references=no.\n", url);
return AVERROR(EACCES);
}
static int nested_io_open(struct AVFormatContext *s, AVIOContext **pb,
const char *url, int flags, AVDictionary **options)
{
struct demuxer *demuxer = s->opaque;
lavf_priv_t *priv = demuxer->priv;
int r = priv->default_io_open(s, pb, url, flags, options);
if (r >= 0) {
struct nested_stream nest = {
.id = *pb,
};
MP_TARRAY_APPEND(priv, priv->nested, priv->num_nested, nest);
}
return r;
}
static void nested_io_close(struct AVFormatContext *s, AVIOContext *pb)
{
struct demuxer *demuxer = s->opaque;
lavf_priv_t *priv = demuxer->priv;
for (int n = 0; n < priv->num_nested; n++) {
if (priv->nested[n].id == pb) {
MP_TARRAY_REMOVE_AT(priv->nested, priv->num_nested, n);
break;
}
}
priv->default_io_close(s, pb);
}
static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check)
{
AVFormatContext *avfc;
AVDictionaryEntry *t = NULL;
float analyze_duration = 0;
lavf_priv_t *priv = talloc_zero(NULL, lavf_priv_t);
demuxer->priv = priv;
priv->stream = demuxer->stream;
priv->opts = mp_get_config_group(priv, demuxer->global, &demux_lavf_conf);
struct demux_lavf_opts *lavfdopts = priv->opts;
int index_mode;
mp_read_option_raw(demuxer->global, "index", &m_option_type_choice,
&index_mode);
mp_read_option_raw(demuxer->global, "mf-fps", &m_option_type_double,
&priv->mf_fps);
if (lavf_check_file(demuxer, check) < 0)
return -1;
avfc = avformat_alloc_context();
if (!avfc)
return -1;
if (index_mode != 1)
avfc->flags |= AVFMT_FLAG_IGNIDX;
if (lavfdopts->probesize) {
if (av_opt_set_int(avfc, "probesize", lavfdopts->probesize, 0) < 0)
MP_ERR(demuxer, "couldn't set option probesize to %u\n",
lavfdopts->probesize);
}
if (priv->format_hack.analyzeduration)
analyze_duration = priv->format_hack.analyzeduration;
if (lavfdopts->analyzeduration)
analyze_duration = lavfdopts->analyzeduration;
if (analyze_duration > 0) {
if (av_opt_set_int(avfc, "analyzeduration",
analyze_duration * AV_TIME_BASE, 0) < 0)
MP_ERR(demuxer, "demux_lavf, couldn't set option "
"analyzeduration to %f\n", analyze_duration);
}
AVDictionary *dopts = NULL;
if ((priv->avif_flags & AVFMT_NOFILE) || priv->format_hack.no_stream) {
mp_setup_av_network_options(&dopts, demuxer->global, demuxer->log);
// This might be incorrect.
demuxer->seekable = true;
} else {
void *buffer = av_malloc(lavfdopts->buffersize);
if (!buffer)
return -1;
priv->pb = avio_alloc_context(buffer, lavfdopts->buffersize, 0,
demuxer, mp_read, NULL, mp_seek);
if (!priv->pb) {
av_free(buffer);
return -1;
}
priv->pb->read_seek = mp_read_seek;
priv->pb->seekable = demuxer->seekable ? AVIO_SEEKABLE_NORMAL : 0;
avfc->pb = priv->pb;
if (stream_control(priv->stream, STREAM_CTRL_HAS_AVSEEK, NULL) > 0)
demuxer->seekable = true;
demuxer->seekable |= priv->format_hack.fully_read;
}
if (matches_avinputformat_name(priv, "rtsp")) {
const char *transport = NULL;
switch (lavfdopts->rtsp_transport) {
case 1: transport = "udp"; break;
case 2: transport = "tcp"; break;
case 3: transport = "http"; break;
}
if (transport)
av_dict_set(&dopts, "rtsp_transport", transport, 0);
}
guess_and_set_vobsub_name(demuxer, &dopts);
if (priv->format_hack.fix_editlists)
av_dict_set(&dopts, "advanced_editlist", "0", 0);
avfc->interrupt_callback = (AVIOInterruptCB){
.callback = interrupt_cb,
.opaque = demuxer,
};
avfc->opaque = demuxer;
if (demuxer->access_references) {
priv->default_io_open = avfc->io_open;
priv->default_io_close = avfc->io_close;
avfc->io_open = nested_io_open;
avfc->io_close = nested_io_close;
} else {
avfc->io_open = block_io_open;
}
mp_set_avdict(&dopts, lavfdopts->avopts);
if (avformat_open_input(&avfc, priv->filename, priv->avif, &dopts) < 0) {
MP_ERR(demuxer, "avformat_open_input() failed\n");
av_dict_free(&dopts);
return -1;
}
mp_avdict_print_unset(demuxer->log, MSGL_V, dopts);
av_dict_free(&dopts);
priv->avfc = avfc;
bool probeinfo = lavfdopts->probeinfo != 0;
switch (lavfdopts->probeinfo) {
case -2: probeinfo = priv->avfc->nb_streams == 0; break;
case -1: probeinfo = !priv->format_hack.skipinfo; break;
}
if (demuxer->params && demuxer->params->skip_lavf_probing)
probeinfo = false;
if (probeinfo) {
if (avformat_find_stream_info(avfc, NULL) < 0) {
MP_ERR(demuxer, "av_find_stream_info() failed\n");
return -1;
}
MP_VERBOSE(demuxer, "avformat_find_stream_info() finished after %"PRId64
" bytes.\n", stream_tell(priv->stream));
}
for (int i = 0; i < avfc->nb_chapters; i++) {
AVChapter *c = avfc->chapters[i];
t = av_dict_get(c->metadata, "title", NULL, 0);
int index = demuxer_add_chapter(demuxer, t ? t->value : "",
c->start * av_q2d(c->time_base), i);
mp_tags_copy_from_av_dictionary(demuxer->chapters[index].metadata, c->metadata);
}
add_new_streams(demuxer);
mp_tags_copy_from_av_dictionary(demuxer->metadata, avfc->metadata);
demuxer->ts_resets_possible =
priv->avif_flags & (AVFMT_TS_DISCONT | AVFMT_NOTIMESTAMPS);
if (avfc->start_time != AV_NOPTS_VALUE)
demuxer->start_time = avfc->start_time / (double)AV_TIME_BASE;
demuxer->fully_read = priv->format_hack.fully_read;
#ifdef AVFMTCTX_UNSEEKABLE
if (avfc->ctx_flags & AVFMTCTX_UNSEEKABLE)
demuxer->seekable = false;
#endif
demuxer->is_network |= priv->format_hack.is_network;
demuxer->seekable &= !priv->format_hack.no_seek;
if (priv->avfc->duration > 0) {
demuxer->duration = (double)priv->avfc->duration / AV_TIME_BASE;
} else {
double total_duration = 0;
double av_duration = 0;
for (int n = 0; n < priv->avfc->nb_streams; n++) {
AVStream *st = priv->avfc->streams[n];
if (st->duration <= 0)
continue;
double f_duration = st->duration * av_q2d(st->time_base);
total_duration = MPMAX(total_duration, f_duration);
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO ||
st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
av_duration = MPMAX(av_duration, f_duration);
}
double duration = av_duration > 0 ? av_duration : total_duration;
if (duration > 0)
demuxer->duration = duration;
}
// In some cases, libavformat will export bogus bullshit timestamps anyway,
// such as with mjpeg.
if (priv->avif_flags & AVFMT_NOTIMESTAMPS) {
MP_WARN(demuxer,
"This format is marked by FFmpeg as having no timestamps!\n"
"FFmpeg will likely make up its own broken timestamps. For\n"
"video streams you can correct this with:\n"
" --no-correct-pts --fps=VALUE\n"
"with VALUE being the real framerate of the stream. You can\n"
"expect seeking and buffering estimation to be generally\n"
"broken as well.\n");
}
if (demuxer->fully_read) {
demux_close_stream(demuxer);
if (priv->own_stream)
free_stream(priv->stream);
priv->own_stream = false;
priv->stream = demuxer->stream;
}
return 0;
}
static bool demux_lavf_read_packet(struct demuxer *demux,
struct demux_packet **mp_pkt)
{
lavf_priv_t *priv = demux->priv;
AVPacket *pkt = &(AVPacket){0};
int r = av_read_frame(priv->avfc, pkt);
update_read_stats(demux);
if (r < 0) {
av_packet_unref(pkt);
if (r == AVERROR(EAGAIN))
return true;
if (r == AVERROR_EOF)
return false;
MP_WARN(demux, "error reading packet.\n");
return false;
}
add_new_streams(demux);
update_metadata(demux);
assert(pkt->stream_index >= 0 && pkt->stream_index < priv->num_streams);
struct stream_info *info = priv->streams[pkt->stream_index];
struct sh_stream *stream = info->sh;
AVStream *st = priv->avfc->streams[pkt->stream_index];
if (!demux_stream_is_selected(stream)) {
av_packet_unref(pkt);
return true; // don't signal EOF if skipping a packet
}
struct demux_packet *dp = new_demux_packet_from_avpacket(pkt);
if (!dp) {
av_packet_unref(pkt);
return true;
}
if (priv->pcm_seek_hack == st && !priv->pcm_seek_hack_packet_size)
priv->pcm_seek_hack_packet_size = pkt->size;
dp->pts = mp_pts_from_av(pkt->pts, &st->time_base);
dp->dts = mp_pts_from_av(pkt->dts, &st->time_base);
dp->duration = pkt->duration * av_q2d(st->time_base);
dp->pos = pkt->pos;
dp->keyframe = pkt->flags & AV_PKT_FLAG_KEY;
#if LIBAVFORMAT_VERSION_MICRO >= 100
if (pkt->flags & AV_PKT_FLAG_DISCARD)
MP_ERR(demux, "Edit lists are not correctly supported (FFmpeg issue).\n");
#endif
av_packet_unref(pkt);
if (priv->format_hack.clear_filepos)
dp->pos = -1;
dp->stream = stream->index;
if (priv->linearize_ts) {
dp->pts = MP_ADD_PTS(dp->pts, info->ts_offset);
dp->dts = MP_ADD_PTS(dp->dts, info->ts_offset);
double pts = MP_PTS_OR_DEF(dp->pts, dp->dts);
if (pts != MP_NOPTS_VALUE) {
if (dp->keyframe) {
if (pts < info->highest_pts) {
MP_WARN(demux, "Linearizing discontinuity: %f -> %f\n",
pts, info->highest_pts);
// Note: introduces a small discontinuity by a frame size.
double diff = info->highest_pts - pts;
dp->pts = MP_ADD_PTS(dp->pts, diff);
dp->dts = MP_ADD_PTS(dp->dts, diff);
pts += diff;
info->ts_offset += diff;
priv->any_ts_fixed = true;
}
info->last_key_pts = pts;
}
info->highest_pts = MP_PTS_MAX(info->highest_pts, pts);
}
}
if (st->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
st->event_flags = 0;
struct mp_tags *tags = talloc_zero(NULL, struct mp_tags);
mp_tags_copy_from_av_dictionary(tags, st->metadata);
double pts = MP_PTS_OR_DEF(dp->pts, dp->dts);
demux_stream_tags_changed(demux, stream, tags, pts);
}
*mp_pkt = dp;
return true;
}
static void demux_seek_lavf(demuxer_t *demuxer, double seek_pts, int flags)
{
lavf_priv_t *priv = demuxer->priv;
int avsflags = 0;
int64_t seek_pts_av = 0;
int seek_stream = -1;
if (priv->any_ts_fixed) {
// helpful message to piss of users
MP_WARN(demuxer, "Some timestamps returned by the demuxer were linearized. "
"A low level seek was requested; this won't work due to "
"restrictions in libavformat's API. You may have more "
"luck by enabling or enlarging the mpv cache.\n");
}
if (priv->linearize_ts < 0)
priv->linearize_ts = 0;
if (!(flags & SEEK_FORWARD))
avsflags = AVSEEK_FLAG_BACKWARD;
if (flags & SEEK_FACTOR) {
struct stream *s = priv->stream;
int64_t end = stream_get_size(s);
if (end > 0 && demuxer->ts_resets_possible &&
!(priv->avif_flags & AVFMT_NO_BYTE_SEEK))
{
avsflags |= AVSEEK_FLAG_BYTE;
seek_pts_av = end * seek_pts;
} else if (priv->avfc->duration != 0 &&
priv->avfc->duration != AV_NOPTS_VALUE)
{
seek_pts_av = seek_pts * priv->avfc->duration;
}
} else {
if (!(flags & SEEK_FORWARD))
seek_pts -= priv->seek_delay;
seek_pts_av = seek_pts * AV_TIME_BASE;
}
// Hack to make wav seeking "deterministic". Without this, features like
// backward playback won't work.
if (priv->pcm_seek_hack && !priv->pcm_seek_hack_packet_size) {
// This might for example be the initial seek. Fuck it up like the
// bullshit it is.
AVPacket pkt = {0};
if (av_read_frame(priv->avfc, &pkt) >= 0)
priv->pcm_seek_hack_packet_size = pkt.size;
av_packet_unref(&pkt);
add_new_streams(demuxer);
}
if (priv->pcm_seek_hack && priv->pcm_seek_hack_packet_size &&
!(avsflags & AVSEEK_FLAG_BYTE))
{
int samples = priv->pcm_seek_hack_packet_size /
priv->pcm_seek_hack->codecpar->block_align;
if (samples > 0) {
MP_VERBOSE(demuxer, "using bullshit libavformat PCM seek hack\n");
double pts = seek_pts_av / (double)AV_TIME_BASE;
seek_pts_av = pts / av_q2d(priv->pcm_seek_hack->time_base);
int64_t align = seek_pts_av % samples;
seek_pts_av -= align;
seek_stream = priv->pcm_seek_hack->index;
}
}
int r = av_seek_frame(priv->avfc, seek_stream, seek_pts_av, avsflags);
if (r < 0 && (avsflags & AVSEEK_FLAG_BACKWARD)) {
// When seeking before the beginning of the file, and seeking fails,
// try again without the backwards flag to make it seek to the
// beginning.
avsflags &= ~AVSEEK_FLAG_BACKWARD;
r = av_seek_frame(priv->avfc, seek_stream, seek_pts_av, avsflags);
}
if (r < 0) {
char buf[180];
av_strerror(r, buf, sizeof(buf));
MP_VERBOSE(demuxer, "Seek failed (%s)\n", buf);
}
update_read_stats(demuxer);
}
static void demux_lavf_switched_tracks(struct demuxer *demuxer)
{
select_tracks(demuxer, 0);
}
static void demux_close_lavf(demuxer_t *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
if (priv) {
// This will be a dangling pointer; but see below.
AVIOContext *leaking = priv->avfc ? priv->avfc->pb : NULL;
avformat_close_input(&priv->avfc);
// The ffmpeg garbage breaks its own API yet again: hls.c will call
// io_open on the main playlist, but never calls io_close. This happens
// to work out for us (since we don't really use custom I/O), but it's
// still weird. Compensate.
if (priv->num_nested == 1 && priv->nested[0].id == leaking)
priv->num_nested = 0;
if (priv->num_nested) {
MP_WARN(demuxer, "Leaking %d nested connections (FFmpeg bug).\n",
priv->num_nested);
}
if (priv->pb)
av_freep(&priv->pb->buffer);
av_freep(&priv->pb);
for (int n = 0; n < priv->num_streams; n++) {
struct stream_info *info = priv->streams[n];
if (info->sh)
avcodec_parameters_free(&info->sh->codec->lav_codecpar);
}
if (priv->own_stream)
free_stream(priv->stream);
talloc_free(priv);
demuxer->priv = NULL;
}
}
const demuxer_desc_t demuxer_desc_lavf = {
.name = "lavf",
.desc = "libavformat",
.read_packet = demux_lavf_read_packet,
.open = demux_open_lavf,
.close = demux_close_lavf,
.seek = demux_seek_lavf,
.switched_tracks = demux_lavf_switched_tracks,
};
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