/* * Copyright (C) 2004 Michael Niedermayer * * 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 #include // #include #include #include #include #include #include #include #include #include #include #include #include "compat/libav.h" #include "config.h" #include "options/options.h" #include "common/msg.h" #include "common/av_opts.h" #include "common/av_common.h" #include "bstr/bstr.h" #include "stream/stream.h" #include "demux.h" #include "stheader.h" #include "options/m_option.h" #define INITIAL_PROBE_SIZE STREAM_BUFFER_SIZE #define PROBE_BUF_SIZE FFMIN(STREAM_MAX_BUFFER_SIZE, 2 * 1024 * 1024) #define OPT_BASE_STRUCT struct MPOpts // 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 const m_option_t lavfdopts_conf[] = { OPT_INTRANGE("probesize", lavfdopts.probesize, 0, 32, INT_MAX), OPT_STRING("format", lavfdopts.format, 0), OPT_FLOATRANGE("analyzeduration", lavfdopts.analyzeduration, 0, 0, 3600), OPT_INTRANGE("buffersize", lavfdopts.buffersize, 0, 1, 10 * 1024 * 1024, OPTDEF_INT(BIO_BUFFER_SIZE)), OPT_FLAG("allow-mimetype", lavfdopts.allow_mimetype, 0), OPT_INTRANGE("probescore", lavfdopts.probescore, 0, 0, 100), OPT_STRING("cryptokey", lavfdopts.cryptokey, 0), OPT_CHOICE("genpts-mode", lavfdopts.genptsmode, 0, ({"lavf", 1}, {"no", 0})), OPT_STRING("o", lavfdopts.avopt, 0), {NULL, NULL, 0, 0, 0, 0, NULL} }; #define MAX_PKT_QUEUE 50 typedef struct lavf_priv { char *filename; const struct format_hack *format_hack; AVInputFormat *avif; AVFormatContext *avfc; AVIOContext *pb; int64_t last_pts; struct sh_stream **streams; // NULL for unknown streams int num_streams; int cur_program; char *mime_type; } lavf_priv_t; struct format_hack { const char *ff_name; const char *mime_type; int probescore; float analyzeduration; bool max_probe; // use probescore only if max. probe size reached }; static const struct format_hack format_hacks[] = { // for webradios {"aac", "audio/aacp", 25, 0.5}, {"aac", "audio/aac", 25, 0.5}, {"mp3", "audio/mpeg", 25, 0.5}, // some mp3 files don't detect correctly {"mp3", NULL, 24, .max_probe = true}, {0} }; static const char *format_blacklist[] = { "tty", // Useless non-sense, sometimes breaks MLP2 subreader.c fallback 0 }; static int mp_read(void *opaque, uint8_t *buf, int size) { struct demuxer *demuxer = opaque; struct stream *stream = demuxer->stream; int ret; ret = stream_read(stream, buf, size); MP_DBG(demuxer, "%d=mp_read(%p, %p, %d), pos: %"PRId64", eof:%d\n", ret, stream, buf, size, stream_tell(stream), stream->eof); return ret; } static int64_t mp_seek(void *opaque, int64_t pos, int whence) { struct demuxer *demuxer = opaque; struct stream *stream = demuxer->stream; int64_t current_pos; MP_DBG(demuxer, "mp_seek(%p, %"PRId64", %d)\n", stream, pos, whence); if (whence == SEEK_CUR) pos += stream_tell(stream); else if (whence == SEEK_END && stream->end_pos > 0) pos += stream->end_pos; else if (whence == SEEK_SET) pos += stream->start_pos; else if (whence == AVSEEK_SIZE && stream->end_pos > 0) { stream_update_size(stream); return stream->end_pos - stream->start_pos; } else return -1; if (pos < 0) return -1; current_pos = stream_tell(stream); if (stream_seek(stream, pos) == 0) { stream_seek(stream, current_pos); return -1; } return pos - stream->start_pos; } static int64_t mp_read_seek(void *opaque, int stream_idx, int64_t ts, int flags) { struct demuxer *demuxer = opaque; struct stream *stream = demuxer->stream; struct lavf_priv *priv = demuxer->priv; AVStream *st = priv->avfc->streams[stream_idx]; double pts = (double)ts * st->time_base.num / st->time_base.den; int ret = stream_control(stream, STREAM_CTRL_SEEK_TO_TIME, &pts); if (ret < 0) ret = AVERROR(ENOSYS); return ret; } static void list_formats(struct demuxer *demuxer) { MP_INFO(demuxer, "Available lavf input formats:\n"); AVInputFormat *fmt = NULL; while ((fmt = av_iformat_next(fmt))) MP_INFO(demuxer, "%15s : %s\n", fmt->name, fmt->long_name); } static char *remove_prefix(char *s, const char **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 *prefixes[] = {"ffmpeg://", "lavf://", "avdevice://", "av://", NULL}; static int lavf_check_file(demuxer_t *demuxer, enum demux_check check) { struct MPOpts *opts = demuxer->opts; struct lavfdopts *lavfdopts = &opts->lavfdopts; struct stream *s = demuxer->stream; lavf_priv_t *priv; assert(!demuxer->priv); demuxer->priv = talloc_zero(NULL, lavf_priv_t); priv = demuxer->priv; priv->filename = s->url; if (!priv->filename) { priv->filename = "mp:unknown"; MP_WARN(demuxer, "Stream url is not set!\n"); } priv->filename = remove_prefix(priv->filename, prefixes); char *avdevice_format = NULL; if (s->type == STREAMTYPE_AVDEVICE) { // 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 = demuxer->stream->mime_type; if (!lavfdopts->allow_mimetype || !mime_type) mime_type = ""; 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; } priv->avif = av_find_input_format(format); if (!priv->avif) { MP_FATAL(demuxer, "Unknown lavf format %s\n", format); return -1; } MP_INFO(demuxer, "Forced lavf %s demuxer\n", priv->avif->long_name); goto success; } // 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. int min_probe = AVPROBE_SCORE_MAX/4 + 1; if (lavfdopts->probescore) min_probe = lavfdopts->probescore; AVProbeData avpd = { // Disable file-extension matching with normal checks .filename = check <= DEMUX_CHECK_REQUEST ? priv->filename : "", .buf_size = 0, .buf = av_mallocz(PROBE_BUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE), }; bool final_probe = false; do { 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; int score = 0; 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.\n", priv->avif->name, score, avpd.buf_size); priv->format_hack = NULL; for (int n = 0; format_hacks[n].ff_name; n++) { const struct format_hack *entry = &format_hacks[n]; if (strcmp(entry->ff_name, priv->avif->name) != 0) continue; if (entry->mime_type && strcasecmp(entry->mime_type, mime_type) != 0) continue; priv->format_hack = entry; break; } if (score >= min_probe) break; if (priv->format_hack) { if (score >= priv->format_hack->probescore && (!priv->format_hack->max_probe || final_probe)) break; } } priv->avif = NULL; priv->format_hack = NULL; } while (!final_probe); av_free(avpd.buf); if (priv->avif && !format) { for (int n = 0; format_blacklist[n]; n++) { if (strcmp(format_blacklist[n], priv->avif->name) == 0) { MP_VERBOSE(demuxer, "Format blacklisted.\n"); priv->avif = NULL; break; } } } if (!priv->avif) { MP_VERBOSE(demuxer, "No format found, try lowering probescore or forcing the format.\n"); return -1; } success: demuxer->filetype = priv->avif->long_name; if (!demuxer->filetype) demuxer->filetype = priv->avif->name; return 0; } static bool matches_avinputformat_name(struct lavf_priv *priv, const char *name) { // At least mp4 has name="mov,mp4,m4a,3gp,3g2,mj2", so we split the name // on "," in general. 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 uint8_t char2int(char c) { if (c >= '0' && c <= '9') return c - '0'; if (c >= 'a' && c <= 'f') return c - 'a' + 10; if (c >= 'A' && c <= 'F') return c - 'A' + 10; return 0; } static void parse_cryptokey(AVFormatContext *avfc, const char *str) { int len = strlen(str) / 2; uint8_t *key = av_mallocz(len); int i; avfc->keylen = len; avfc->key = key; for (i = 0; i < len; i++, str += 2) *key++ = (char2int(str[0]) << 4) | char2int(str[1]); } 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]; AVStream *st = priv->avfc->streams[n]; bool selected = stream && demuxer_stream_is_selected(demuxer, stream) && !stream->attached_picture; st->discard = selected ? AVDISCARD_DEFAULT : AVDISCARD_ALL; } } static void handle_stream(demuxer_t *demuxer, int i) { lavf_priv_t *priv = demuxer->priv; AVFormatContext *avfc = priv->avfc; AVStream *st = avfc->streams[i]; AVCodecContext *codec = st->codec; struct sh_stream *sh = NULL; switch (codec->codec_type) { case AVMEDIA_TYPE_AUDIO: { sh = new_sh_stream(demuxer, STREAM_AUDIO); if (!sh) break; sh_audio_t *sh_audio = sh->audio; sh->format = codec->codec_tag; // probably unneeded mp_chmap_from_channels(&sh_audio->channels, codec->channels); if (codec->channel_layout) mp_chmap_from_lavc(&sh_audio->channels, codec->channel_layout); sh_audio->samplerate = codec->sample_rate; sh_audio->i_bps = codec->bit_rate / 8; break; } case AVMEDIA_TYPE_VIDEO: { sh = new_sh_stream(demuxer, STREAM_VIDEO); if (!sh) break; sh_video_t *sh_video = sh->video; if (st->disposition & AV_DISPOSITION_ATTACHED_PIC) { sh->attached_picture = new_demux_packet_from(st->attached_pic.data, st->attached_pic.size); sh->attached_picture->pts = 0; talloc_steal(sh, sh->attached_picture); sh->attached_picture->keyframe = true; } sh->format = codec->codec_tag; sh_video->disp_w = codec->width; sh_video->disp_h = codec->height; /* Try to make up some frame rate value, even if it's not reliable. * FPS information is needed to support subtitle formats which base * timing on frame numbers. * Libavformat seems to report no "reliable" FPS value for AVI files, * while they are typically constant enough FPS that the value this * heuristic makes up works with subtitles in practice. */ double fps; if (st->avg_frame_rate.num) fps = av_q2d(st->avg_frame_rate); else fps = 1.0 / FFMAX(av_q2d(st->time_base), av_q2d(st->codec->time_base) * st->codec->ticks_per_frame); sh_video->fps = fps; if (st->sample_aspect_ratio.num) sh_video->aspect = codec->width * st->sample_aspect_ratio.num / (float)(codec->height * st->sample_aspect_ratio.den); else sh_video->aspect = codec->width * codec->sample_aspect_ratio.num / (float)(codec->height * codec->sample_aspect_ratio.den); sh_video->i_bps = codec->bit_rate / 8; // This also applies to vfw-muxed mkv, but we can't detect these easily. sh_video->avi_dts = matches_avinputformat_name(priv, "avi"); MP_DBG(demuxer, "aspect= %d*%d/(%d*%d)\n", codec->width, codec->sample_aspect_ratio.num, codec->height, codec->sample_aspect_ratio.den); break; } case AVMEDIA_TYPE_SUBTITLE: { sh_sub_t *sh_sub; sh = new_sh_stream(demuxer, STREAM_SUB); if (!sh) break; sh_sub = sh->sub; if (codec->extradata_size) { sh_sub->extradata = talloc_size(sh, codec->extradata_size); memcpy(sh_sub->extradata, codec->extradata, codec->extradata_size); sh_sub->extradata_len = codec->extradata_size; } sh_sub->w = codec->width; sh_sub->h = codec->height; 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_sub->frame_based = av_q2d(av_inv_q(codec->time_base)); } else { // Older libavformat versions. If the FPS matches the microdvd // reader's default, assume it uses frame based timing. if (codec->time_base.num == 125 && codec->time_base.den == 2997) sh_sub->frame_based = 23.976; } } break; } case AVMEDIA_TYPE_ATTACHMENT: { AVDictionaryEntry *ftag = av_dict_get(st->metadata, "filename", NULL, 0); char *filename = ftag ? ftag->value : NULL; if (st->codec->codec_id == AV_CODEC_ID_TTF) demuxer_add_attachment(demuxer, bstr0(filename), bstr0("application/x-truetype-font"), (struct bstr){codec->extradata, codec->extradata_size}); break; } default: ; } assert(priv->num_streams == i); // directly mapped MP_TARRAY_APPEND(priv, priv->streams, priv->num_streams, sh); if (sh) { sh->codec = mp_codec_from_av_codec_id(codec->codec_id); sh->lav_headers = codec; if (st->disposition & AV_DISPOSITION_DEFAULT) sh->default_track = 1; if (matches_avinputformat_name(priv, "mpeg") || matches_avinputformat_name(priv, "mpegts")) 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); AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0); if (lang && lang->value) sh->lang = talloc_strdup(sh, lang->value); } 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_stream(demuxer, priv->num_streams); } static void add_metadata(struct mp_tags *tags, AVDictionary *metadata) { AVDictionaryEntry *t = NULL; while ((t = av_dict_get(metadata, "", t, AV_DICT_IGNORE_SUFFIX))) mp_tags_set_str(tags, t->key, t->value); } static void update_metadata(demuxer_t *demuxer, AVPacket *pkt) { #if HAVE_AVCODEC_METADATA_UPDATE_SIDE_DATA int md_size; const uint8_t *md; md = av_packet_get_side_data(pkt, AV_PKT_DATA_METADATA_UPDATE, &md_size); if (md) { AVDictionary *dict = NULL; av_packet_unpack_dictionary(md, md_size, &dict); if (dict) { mp_tags_clear(demuxer->metadata); add_metadata(demuxer->metadata, dict); av_dict_free(&dict); } } #endif } static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check) { struct MPOpts *opts = demuxer->opts; struct lavfdopts *lavfdopts = &opts->lavfdopts; AVFormatContext *avfc; AVDictionaryEntry *t = NULL; float analyze_duration = 0; int i; if (lavf_check_file(demuxer, check) < 0) return -1; lavf_priv_t *priv = demuxer->priv; if (!priv) return -1; avfc = avformat_alloc_context(); if (lavfdopts->cryptokey) parse_cryptokey(avfc, lavfdopts->cryptokey); if (lavfdopts->genptsmode) avfc->flags |= AVFMT_FLAG_GENPTS; if (opts->index_mode == 0) avfc->flags |= AVFMT_FLAG_IGNIDX; #if LIBAVFORMAT_VERSION_MICRO >= 100 /* Keep side data as side data instead of mashing it into the packet * stream. * Note: Libav doesn't have this horrible insanity. */ av_opt_set(avfc, "fflags", "+keepside", 0); #endif if (lavfdopts->probesize) { if (av_opt_set_int(avfc, "probesize", lavfdopts->probesize, 0) < 0) MP_ERR(demuxer, "demux_lavf, couldn't set option probesize to %u\n", lavfdopts->probesize); } if (priv->format_hack && 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); } if (lavfdopts->avopt) { if (parse_avopts(avfc, lavfdopts->avopt) < 0) { MP_ERR(demuxer, "Your options /%s/ look like gibberish to me pal\n", lavfdopts->avopt); return -1; } } if ((priv->avif->flags & AVFMT_NOFILE) || demuxer->stream->type == STREAMTYPE_AVDEVICE) { // 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; } AVDictionary *dopts = NULL; if (matches_avinputformat_name(priv, "rtsp")) { const char *transport = NULL; switch (opts->network_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); } if (avformat_open_input(&avfc, priv->filename, priv->avif, &dopts) < 0) { MP_ERR(demuxer, "LAVF_header: avformat_open_input() failed\n"); av_dict_free(&dopts); return -1; } t = NULL; while ((t = av_dict_get(dopts, "", t, AV_DICT_IGNORE_SUFFIX))) { MP_VERBOSE(demuxer, "[lavf] Could not set demux option %s=%s\n", t->key, t->value); } av_dict_free(&dopts); priv->avfc = avfc; if (avformat_find_stream_info(avfc, NULL) < 0) { MP_ERR(demuxer, "LAVF_header: av_find_stream_info() failed\n"); return -1; } MP_VERBOSE(demuxer, "demux_lavf: avformat_find_stream_info() " "finished after %"PRId64" bytes.\n", stream_tell(demuxer->stream)); for (i = 0; i < avfc->nb_chapters; i++) { AVChapter *c = avfc->chapters[i]; uint64_t start = av_rescale_q(c->start, c->time_base, (AVRational){1, 1000000000}); uint64_t end = av_rescale_q(c->end, c->time_base, (AVRational){1, 1000000000}); t = av_dict_get(c->metadata, "title", NULL, 0); int index = demuxer_add_chapter(demuxer, t ? bstr0(t->value) : bstr0(""), start, end, i); add_metadata(demuxer->chapters[index].metadata, c->metadata); } add_new_streams(demuxer); add_metadata(demuxer->metadata, avfc->metadata); // Often useful with OGG audio-only files, which have metadata in the audio // track metadata instead of the main metadata. if (demuxer->num_streams == 1) { for (int n = 0; n < priv->num_streams; n++) { if (priv->streams[n]) add_metadata(demuxer->metadata, avfc->streams[n]->metadata); } } if (avfc->nb_programs) { int p; for (p = 0; p < avfc->nb_programs; p++) { AVProgram *program = avfc->programs[p]; t = av_dict_get(program->metadata, "title", NULL, 0); MP_INFO(demuxer, "LAVF: Program %d %s\n", program->id, t ? t->value : ""); MP_VERBOSE(demuxer, "PROGRAM_ID=%d\n", program->id); } } MP_VERBOSE(demuxer, "LAVF: build %d\n", LIBAVFORMAT_BUILD); demuxer->ts_resets_possible = priv->avif->flags & AVFMT_TS_DISCONT; return 0; } static void destroy_avpacket(void *pkt) { av_free_packet(pkt); } static int demux_lavf_fill_buffer(demuxer_t *demux) { lavf_priv_t *priv = demux->priv; demux_packet_t *dp; MP_DBG(demux, "demux_lavf_fill_buffer()\n"); AVPacket *pkt = talloc(NULL, AVPacket); if (av_read_frame(priv->avfc, pkt) < 0) { talloc_free(pkt); return 0; // eof } talloc_set_destructor(pkt, destroy_avpacket); add_new_streams(demux); update_metadata(demux, pkt); assert(pkt->stream_index >= 0 && pkt->stream_index < priv->num_streams); struct sh_stream *stream = priv->streams[pkt->stream_index]; AVStream *st = priv->avfc->streams[pkt->stream_index]; if (!demuxer_stream_is_selected(demux, stream)) { talloc_free(pkt); return 1; // don't signal EOF if skipping a packet } // If the packet has pointers to temporary fields that could be // overwritten/freed by next av_read_frame(), copy them to persistent // allocations so we can safely queue the packet for any length of time. if (av_dup_packet(pkt) < 0) abort(); dp = new_demux_packet_fromdata(pkt->data, pkt->size); dp->avpacket = talloc_steal(dp, pkt); if (pkt->pts != AV_NOPTS_VALUE) dp->pts = pkt->pts * av_q2d(st->time_base); if (pkt->dts != AV_NOPTS_VALUE) dp->dts = pkt->dts * av_q2d(st->time_base); dp->duration = pkt->duration * av_q2d(st->time_base); if (pkt->convergence_duration > 0) dp->duration = pkt->convergence_duration * av_q2d(st->time_base); dp->pos = pkt->pos; dp->keyframe = pkt->flags & AV_PKT_FLAG_KEY; // Use only one stream for stream_pts, otherwise PTS might be jumpy. if (stream->type == STREAM_VIDEO) { double pts; if (stream_control(demux->stream, STREAM_CTRL_GET_CURRENT_TIME, &pts) > 0) dp->stream_pts = pts; } if (dp->pts != MP_NOPTS_VALUE) { priv->last_pts = dp->pts * AV_TIME_BASE; } else if (dp->dts != MP_NOPTS_VALUE) { priv->last_pts = dp->dts * AV_TIME_BASE; } demuxer_add_packet(demux, stream, dp); return 1; } static void demux_seek_lavf(demuxer_t *demuxer, float rel_seek_secs, int flags) { lavf_priv_t *priv = demuxer->priv; int avsflags = 0; MP_DBG(demuxer, "demux_seek_lavf(%p, %f, %d)\n", demuxer, rel_seek_secs, flags); if (flags & SEEK_ABSOLUTE) priv->last_pts = 0; else if (rel_seek_secs < 0) avsflags = AVSEEK_FLAG_BACKWARD; if (flags & SEEK_FORWARD) avsflags = 0; else if (flags & SEEK_BACKWARD) avsflags = AVSEEK_FLAG_BACKWARD; if (flags & SEEK_FACTOR) { struct stream *s = demuxer->stream; if (s->end_pos > 0 && demuxer->ts_resets_possible && !(priv->avif->flags & AVFMT_NO_BYTE_SEEK)) { avsflags |= AVSEEK_FLAG_BYTE; priv->last_pts = (s->end_pos - s->start_pos) * rel_seek_secs; } else if (priv->avfc->duration != 0 && priv->avfc->duration != AV_NOPTS_VALUE) { priv->last_pts = rel_seek_secs * priv->avfc->duration; } } else { priv->last_pts += rel_seek_secs * AV_TIME_BASE; } if (!priv->avfc->iformat->read_seek2) { // Normal seeking. int r = av_seek_frame(priv->avfc, -1, priv->last_pts, 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; av_seek_frame(priv->avfc, -1, priv->last_pts, avsflags); } } else { // av_seek_frame() won't work. Use "new" seeking API. We don't use this // API by default, because there are some major issues. // Set max_ts==ts, so that demuxing starts from an earlier position in // the worst case. // To make this horrible situation even worse, some lavf demuxers have // broken timebase handling (everything that uses // ff_subtitles_queue_seek()), and always uses the stream timebase. So // we use the timebase and stream index of the first enabled stream // (i.e. a stream which can participate in seeking). int stream_index = -1; AVRational time_base = {1, AV_TIME_BASE}; for (int n = 0; n < priv->num_streams; n++) { struct sh_stream *stream = priv->streams[n]; AVStream *st = priv->avfc->streams[n]; if (stream && st->discard != AVDISCARD_ALL) { stream_index = n; time_base = st->time_base; break; } } int64_t pts = priv->last_pts; if (pts != AV_NOPTS_VALUE) pts = pts / (double)AV_TIME_BASE * av_q2d(av_inv_q(time_base)); int r = avformat_seek_file(priv->avfc, stream_index, INT64_MIN, pts, pts, avsflags); // Similar issue as in the normal seeking codepath. if (r < 0) { avformat_seek_file(priv->avfc, stream_index, INT64_MIN, pts, INT64_MAX, avsflags); } } } static int demux_lavf_control(demuxer_t *demuxer, int cmd, void *arg) { lavf_priv_t *priv = demuxer->priv; switch (cmd) { case DEMUXER_CTRL_GET_TIME_LENGTH: if (priv->avfc->duration == 0 || priv->avfc->duration == AV_NOPTS_VALUE) return DEMUXER_CTRL_DONTKNOW; *((double *)arg) = (double)priv->avfc->duration / AV_TIME_BASE; return DEMUXER_CTRL_OK; case DEMUXER_CTRL_GET_START_TIME: *((double *)arg) = priv->avfc->start_time == AV_NOPTS_VALUE ? 0 : (double)priv->avfc->start_time / AV_TIME_BASE; return DEMUXER_CTRL_OK; case DEMUXER_CTRL_SWITCHED_TRACKS: { select_tracks(demuxer, 0); return DEMUXER_CTRL_OK; } case DEMUXER_CTRL_IDENTIFY_PROGRAM: { demux_program_t *prog = arg; AVProgram *program; int p, i; int start; add_new_streams(demuxer); prog->vid = prog->aid = prog->sid = -2; if (priv->avfc->nb_programs < 1) return DEMUXER_CTRL_DONTKNOW; if (prog->progid == -1) { p = 0; while (p < priv->avfc->nb_programs && priv->avfc->programs[p]->id != priv->cur_program) p++; p = (p + 1) % priv->avfc->nb_programs; } else { for (i = 0; i < priv->avfc->nb_programs; i++) if (priv->avfc->programs[i]->id == prog->progid) break; if (i == priv->avfc->nb_programs) return DEMUXER_CTRL_DONTKNOW; p = i; } start = p; redo: prog->vid = prog->aid = prog->sid = -2; program = priv->avfc->programs[p]; for (i = 0; i < program->nb_stream_indexes; i++) { struct sh_stream *stream = priv->streams[program->stream_index[i]]; if (stream) { switch (stream->type) { case STREAM_VIDEO: if (prog->vid == -2) prog->vid = stream->demuxer_id; break; case STREAM_AUDIO: if (prog->aid == -2) prog->aid = stream->demuxer_id; break; case STREAM_SUB: if (prog->sid == -2) prog->sid = stream->demuxer_id; break; } } } if (prog->progid == -1 && prog->vid == -2 && prog->aid == -2) { p = (p + 1) % priv->avfc->nb_programs; if (p == start) return DEMUXER_CTRL_DONTKNOW; goto redo; } priv->cur_program = prog->progid = program->id; return DEMUXER_CTRL_OK; } case DEMUXER_CTRL_RESYNC: /* NOTE: * * We actually want to call ff_read_frame_flush() here, but it is * internal. * * This function call seems to do the same for now. * * Once ff_read_frame_flush() is exported in some way, change this to * call the new API instead of relying on av_seek_frame() to do this * for us. */ stream_drop_buffers(demuxer->stream); avio_flush(priv->avfc->pb); av_seek_frame(priv->avfc, 0, stream_tell(demuxer->stream), AVSEEK_FLAG_BYTE); avio_flush(priv->avfc->pb); return DEMUXER_CTRL_OK; default: return DEMUXER_CTRL_NOTIMPL; } } static void demux_close_lavf(demuxer_t *demuxer) { lavf_priv_t *priv = demuxer->priv; if (priv) { if (priv->avfc) { av_freep(&priv->avfc->key); avformat_close_input(&priv->avfc); } if (priv->pb) av_freep(&priv->pb->buffer); av_freep(&priv->pb); talloc_free(priv); demuxer->priv = NULL; } } const demuxer_desc_t demuxer_desc_lavf = { .name = "lavf", .desc = "libavformat", .fill_buffer = demux_lavf_fill_buffer, .open = demux_open_lavf, .close = demux_close_lavf, .seek = demux_seek_lavf, .control = demux_lavf_control, };