| /* |
| * Ogg bitstream support |
| * Luca Barbato <lu_zero@gentoo.org> |
| * Based on tcvp implementation |
| */ |
| |
| /* |
| Copyright (C) 2005 Michael Ahlberg, Måns Rullgård |
| |
| Permission is hereby granted, free of charge, to any person |
| obtaining a copy of this software and associated documentation |
| files (the "Software"), to deal in the Software without |
| restriction, including without limitation the rights to use, copy, |
| modify, merge, publish, distribute, sublicense, and/or sell copies |
| of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <stdio.h> |
| #include "libavutil/avassert.h" |
| #include "libavutil/intreadwrite.h" |
| #include "oggdec.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "vorbiscomment.h" |
| |
| #define MAX_PAGE_SIZE 65307 |
| #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE |
| |
| static const struct ogg_codec * const ogg_codecs[] = { |
| &ff_skeleton_codec, |
| &ff_daala_codec, |
| &ff_dirac_codec, |
| &ff_speex_codec, |
| &ff_vorbis_codec, |
| &ff_theora_codec, |
| &ff_flac_codec, |
| &ff_celt_codec, |
| &ff_opus_codec, |
| &ff_vp8_codec, |
| &ff_old_dirac_codec, |
| &ff_old_flac_codec, |
| &ff_ogm_video_codec, |
| &ff_ogm_audio_codec, |
| &ff_ogm_text_codec, |
| &ff_ogm_old_codec, |
| NULL |
| }; |
| |
| static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts); |
| static int ogg_new_stream(AVFormatContext *s, uint32_t serial); |
| static int ogg_restore(AVFormatContext *s, int discard); |
| |
| //FIXME We could avoid some structure duplication |
| static int ogg_save(AVFormatContext *s) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_state *ost = |
| av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams)); |
| int i; |
| int ret = 0; |
| |
| if (!ost) |
| return AVERROR(ENOMEM); |
| |
| ost->pos = avio_tell(s->pb); |
| ost->curidx = ogg->curidx; |
| ost->next = ogg->state; |
| ost->nstreams = ogg->nstreams; |
| memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams)); |
| |
| for (i = 0; i < ogg->nstreams; i++) { |
| struct ogg_stream *os = ogg->streams + i; |
| os->buf = av_mallocz(os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (os->buf) |
| memcpy(os->buf, ost->streams[i].buf, os->bufpos); |
| else |
| ret = AVERROR(ENOMEM); |
| os->new_metadata = NULL; |
| os->new_metadata_size = 0; |
| } |
| |
| ogg->state = ost; |
| |
| if (ret < 0) |
| ogg_restore(s, 0); |
| |
| return ret; |
| } |
| |
| static int ogg_restore(AVFormatContext *s, int discard) |
| { |
| struct ogg *ogg = s->priv_data; |
| AVIOContext *bc = s->pb; |
| struct ogg_state *ost = ogg->state; |
| int i, err; |
| |
| if (!ost) |
| return 0; |
| |
| ogg->state = ost->next; |
| |
| if (!discard) { |
| |
| for (i = 0; i < ogg->nstreams; i++) |
| av_freep(&ogg->streams[i].buf); |
| |
| avio_seek(bc, ost->pos, SEEK_SET); |
| ogg->page_pos = -1; |
| ogg->curidx = ost->curidx; |
| ogg->nstreams = ost->nstreams; |
| if ((err = av_reallocp_array(&ogg->streams, ogg->nstreams, |
| sizeof(*ogg->streams))) < 0) { |
| ogg->nstreams = 0; |
| return err; |
| } else |
| memcpy(ogg->streams, ost->streams, |
| ost->nstreams * sizeof(*ogg->streams)); |
| } |
| |
| av_free(ost); |
| |
| return 0; |
| } |
| |
| static int ogg_reset(AVFormatContext *s) |
| { |
| struct ogg *ogg = s->priv_data; |
| int i; |
| int64_t start_pos = avio_tell(s->pb); |
| |
| for (i = 0; i < ogg->nstreams; i++) { |
| struct ogg_stream *os = ogg->streams + i; |
| os->bufpos = 0; |
| os->pstart = 0; |
| os->psize = 0; |
| os->granule = -1; |
| os->lastpts = AV_NOPTS_VALUE; |
| os->lastdts = AV_NOPTS_VALUE; |
| os->sync_pos = -1; |
| os->page_pos = 0; |
| os->nsegs = 0; |
| os->segp = 0; |
| os->incomplete = 0; |
| os->got_data = 0; |
| if (start_pos <= s->internal->data_offset) { |
| os->lastpts = 0; |
| } |
| os->end_trimming = 0; |
| av_freep(&os->new_metadata); |
| os->new_metadata_size = 0; |
| } |
| |
| ogg->page_pos = -1; |
| ogg->curidx = -1; |
| |
| return 0; |
| } |
| |
| static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size) |
| { |
| int i; |
| |
| for (i = 0; ogg_codecs[i]; i++) |
| if (size >= ogg_codecs[i]->magicsize && |
| !memcmp(buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize)) |
| return ogg_codecs[i]; |
| |
| return NULL; |
| } |
| |
| /** |
| * Replace the current stream with a new one. This is a typical webradio |
| * situation where a new audio stream spawn (identified with a new serial) and |
| * must replace the previous one (track switch). |
| */ |
| static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, int nsegs) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os; |
| const struct ogg_codec *codec; |
| int i = 0; |
| |
| if (s->pb->seekable) { |
| uint8_t magic[8]; |
| int64_t pos = avio_tell(s->pb); |
| avio_skip(s->pb, nsegs); |
| avio_read(s->pb, magic, sizeof(magic)); |
| avio_seek(s->pb, pos, SEEK_SET); |
| codec = ogg_find_codec(magic, sizeof(magic)); |
| if (!codec) { |
| av_log(s, AV_LOG_ERROR, "Cannot identify new stream\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| for (i = 0; i < ogg->nstreams; i++) { |
| if (ogg->streams[i].codec == codec) |
| break; |
| } |
| if (i >= ogg->nstreams) |
| return ogg_new_stream(s, serial); |
| } else if (ogg->nstreams != 1) { |
| avpriv_report_missing_feature(s, "Changing stream parameters in multistream ogg"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| os = &ogg->streams[i]; |
| |
| os->serial = serial; |
| return i; |
| |
| #if 0 |
| buf = os->buf; |
| bufsize = os->bufsize; |
| codec = os->codec; |
| |
| if (!ogg->state || ogg->state->streams[i].private != os->private) |
| av_freep(&ogg->streams[i].private); |
| |
| /* Set Ogg stream settings similar to what is done in ogg_new_stream(). We |
| * also re-use the ogg_stream allocated buffer */ |
| memset(os, 0, sizeof(*os)); |
| os->serial = serial; |
| os->bufsize = bufsize; |
| os->buf = buf; |
| os->header = -1; |
| os->codec = codec; |
| |
| return i; |
| #endif |
| } |
| |
| static int ogg_new_stream(AVFormatContext *s, uint32_t serial) |
| { |
| struct ogg *ogg = s->priv_data; |
| int idx = ogg->nstreams; |
| AVStream *st; |
| struct ogg_stream *os; |
| size_t size; |
| |
| if (ogg->state) { |
| av_log(s, AV_LOG_ERROR, "New streams are not supposed to be added " |
| "in between Ogg context save/restore operations.\n"); |
| return AVERROR_BUG; |
| } |
| |
| /* Allocate and init a new Ogg Stream */ |
| if (av_size_mult(ogg->nstreams + 1, sizeof(*ogg->streams), &size) < 0 || |
| !(os = av_realloc(ogg->streams, size))) |
| return AVERROR(ENOMEM); |
| ogg->streams = os; |
| os = ogg->streams + idx; |
| memset(os, 0, sizeof(*os)); |
| os->serial = serial; |
| os->bufsize = DECODER_BUFFER_SIZE; |
| os->buf = av_malloc(os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE); |
| os->header = -1; |
| os->start_granule = OGG_NOGRANULE_VALUE; |
| if (!os->buf) |
| return AVERROR(ENOMEM); |
| |
| /* Create the associated AVStream */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| av_freep(&os->buf); |
| return AVERROR(ENOMEM); |
| } |
| st->id = idx; |
| avpriv_set_pts_info(st, 64, 1, 1000000); |
| |
| ogg->nstreams++; |
| return idx; |
| } |
| |
| static int ogg_new_buf(struct ogg *ogg, int idx) |
| { |
| struct ogg_stream *os = ogg->streams + idx; |
| uint8_t *nb = av_malloc(os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE); |
| int size = os->bufpos - os->pstart; |
| |
| if (!nb) |
| return AVERROR(ENOMEM); |
| |
| if (os->buf) { |
| memcpy(nb, os->buf + os->pstart, size); |
| av_free(os->buf); |
| } |
| |
| os->buf = nb; |
| os->bufpos = size; |
| os->pstart = 0; |
| |
| return 0; |
| } |
| |
| static int data_packets_seen(const struct ogg *ogg) |
| { |
| int i; |
| |
| for (i = 0; i < ogg->nstreams; i++) |
| if (ogg->streams[i].got_data) |
| return 1; |
| return 0; |
| } |
| |
| static int ogg_read_page(AVFormatContext *s, int *sid) |
| { |
| AVIOContext *bc = s->pb; |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os; |
| int ret, i = 0; |
| int flags, nsegs; |
| uint64_t gp; |
| uint32_t serial; |
| int size, idx; |
| uint8_t sync[4]; |
| int sp = 0; |
| |
| ret = avio_read(bc, sync, 4); |
| if (ret < 4) |
| return ret < 0 ? ret : AVERROR_EOF; |
| |
| do { |
| int c; |
| |
| if (sync[sp & 3] == 'O' && |
| sync[(sp + 1) & 3] == 'g' && |
| sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S') |
| break; |
| |
| if(!i && bc->seekable && ogg->page_pos > 0) { |
| memset(sync, 0, 4); |
| avio_seek(bc, ogg->page_pos+4, SEEK_SET); |
| ogg->page_pos = -1; |
| } |
| |
| c = avio_r8(bc); |
| |
| if (avio_feof(bc)) |
| return AVERROR_EOF; |
| |
| sync[sp++ & 3] = c; |
| } while (i++ < MAX_PAGE_SIZE); |
| |
| if (i >= MAX_PAGE_SIZE) { |
| av_log(s, AV_LOG_INFO, "cannot find sync word\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (avio_r8(bc) != 0) { /* version */ |
| av_log (s, AV_LOG_ERROR, "ogg page, unsupported version\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| flags = avio_r8(bc); |
| gp = avio_rl64(bc); |
| serial = avio_rl32(bc); |
| avio_skip(bc, 8); /* seq, crc */ |
| nsegs = avio_r8(bc); |
| |
| idx = ogg_find_stream(ogg, serial); |
| if (idx < 0) { |
| if (data_packets_seen(ogg)) |
| idx = ogg_replace_stream(s, serial, nsegs); |
| else |
| idx = ogg_new_stream(s, serial); |
| |
| if (idx < 0) { |
| av_log(s, AV_LOG_ERROR, "failed to create or replace stream\n"); |
| return idx; |
| } |
| } |
| |
| os = ogg->streams + idx; |
| ogg->page_pos = |
| os->page_pos = avio_tell(bc) - 27; |
| |
| if (os->psize > 0) { |
| ret = ogg_new_buf(ogg, idx); |
| if (ret < 0) |
| return ret; |
| } |
| |
| ret = avio_read(bc, os->segments, nsegs); |
| if (ret < nsegs) |
| return ret < 0 ? ret : AVERROR_EOF; |
| |
| os->nsegs = nsegs; |
| os->segp = 0; |
| |
| size = 0; |
| for (i = 0; i < nsegs; i++) |
| size += os->segments[i]; |
| |
| if (!(flags & OGG_FLAG_BOS)) |
| os->got_data = 1; |
| |
| if (flags & OGG_FLAG_CONT || os->incomplete) { |
| if (!os->psize) { |
| // If this is the very first segment we started |
| // playback in the middle of a continuation packet. |
| // Discard it since we missed the start of it. |
| while (os->segp < os->nsegs) { |
| int seg = os->segments[os->segp++]; |
| os->pstart += seg; |
| if (seg < 255) |
| break; |
| } |
| os->sync_pos = os->page_pos; |
| } |
| } else { |
| os->psize = 0; |
| os->sync_pos = os->page_pos; |
| } |
| |
| if (os->bufsize - os->bufpos < size) { |
| uint8_t *nb = av_malloc((os->bufsize *= 2) + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!nb) |
| return AVERROR(ENOMEM); |
| memcpy(nb, os->buf, os->bufpos); |
| av_free(os->buf); |
| os->buf = nb; |
| } |
| |
| ret = avio_read(bc, os->buf + os->bufpos, size); |
| if (ret < size) |
| return ret < 0 ? ret : AVERROR_EOF; |
| |
| os->bufpos += size; |
| os->granule = gp; |
| os->flags = flags; |
| |
| memset(os->buf + os->bufpos, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| if (sid) |
| *sid = idx; |
| |
| return 0; |
| } |
| |
| /** |
| * @brief find the next Ogg packet |
| * @param *sid is set to the stream for the packet or -1 if there is |
| * no matching stream, in that case assume all other return |
| * values to be uninitialized. |
| * @return negative value on error or EOF. |
| */ |
| static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, |
| int64_t *fpos) |
| { |
| struct ogg *ogg = s->priv_data; |
| int idx, i, ret; |
| struct ogg_stream *os; |
| int complete = 0; |
| int segp = 0, psize = 0; |
| |
| av_log(s, AV_LOG_TRACE, "ogg_packet: curidx=%i\n", ogg->curidx); |
| if (sid) |
| *sid = -1; |
| |
| do { |
| idx = ogg->curidx; |
| |
| while (idx < 0) { |
| ret = ogg_read_page(s, &idx); |
| if (ret < 0) |
| return ret; |
| } |
| |
| os = ogg->streams + idx; |
| |
| av_log(s, AV_LOG_TRACE, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n", |
| idx, os->pstart, os->psize, os->segp, os->nsegs); |
| |
| if (!os->codec) { |
| if (os->header < 0) { |
| os->codec = ogg_find_codec(os->buf, os->bufpos); |
| if (!os->codec) { |
| av_log(s, AV_LOG_WARNING, "Codec not found\n"); |
| os->header = 0; |
| return 0; |
| } |
| } else { |
| return 0; |
| } |
| } |
| |
| segp = os->segp; |
| psize = os->psize; |
| |
| while (os->segp < os->nsegs) { |
| int ss = os->segments[os->segp++]; |
| os->psize += ss; |
| if (ss < 255) { |
| complete = 1; |
| break; |
| } |
| } |
| |
| if (!complete && os->segp == os->nsegs) { |
| ogg->curidx = -1; |
| // Do not set incomplete for empty packets. |
| // Together with the code in ogg_read_page |
| // that discards all continuation of empty packets |
| // we would get an infinite loop. |
| os->incomplete = !!os->psize; |
| } |
| } while (!complete); |
| |
| |
| if (os->granule == -1) |
| av_log(s, AV_LOG_WARNING, |
| "Page at %"PRId64" is missing granule\n", |
| os->page_pos); |
| |
| ogg->curidx = idx; |
| os->incomplete = 0; |
| |
| if (os->header) { |
| os->header = os->codec->header(s, idx); |
| if (!os->header) { |
| os->segp = segp; |
| os->psize = psize; |
| |
| // We have reached the first non-header packet in this stream. |
| // Unfortunately more header packets may still follow for others, |
| // but if we continue with header parsing we may lose data packets. |
| ogg->headers = 1; |
| |
| // Update the header state for all streams and |
| // compute the data_offset. |
| if (!s->internal->data_offset) |
| s->internal->data_offset = os->sync_pos; |
| |
| for (i = 0; i < ogg->nstreams; i++) { |
| struct ogg_stream *cur_os = ogg->streams + i; |
| |
| // if we have a partial non-header packet, its start is |
| // obviously at or after the data start |
| if (cur_os->incomplete) |
| s->internal->data_offset = FFMIN(s->internal->data_offset, cur_os->sync_pos); |
| } |
| } else { |
| os->nb_header++; |
| os->pstart += os->psize; |
| os->psize = 0; |
| } |
| } else { |
| os->pflags = 0; |
| os->pduration = 0; |
| if (os->codec && os->codec->packet) |
| os->codec->packet(s, idx); |
| if (sid) |
| *sid = idx; |
| if (dstart) |
| *dstart = os->pstart; |
| if (dsize) |
| *dsize = os->psize; |
| if (fpos) |
| *fpos = os->sync_pos; |
| os->pstart += os->psize; |
| os->psize = 0; |
| if(os->pstart == os->bufpos) |
| os->bufpos = os->pstart = 0; |
| os->sync_pos = os->page_pos; |
| } |
| |
| // determine whether there are more complete packets in this page |
| // if not, the page's granule will apply to this packet |
| os->page_end = 1; |
| for (i = os->segp; i < os->nsegs; i++) |
| if (os->segments[i] < 255) { |
| os->page_end = 0; |
| break; |
| } |
| |
| if (os->segp == os->nsegs) |
| ogg->curidx = -1; |
| |
| return 0; |
| } |
| |
| static int ogg_get_length(AVFormatContext *s) |
| { |
| struct ogg *ogg = s->priv_data; |
| int i, ret; |
| int64_t size, end; |
| int streams_left=0; |
| |
| if (!s->pb->seekable) |
| return 0; |
| |
| // already set |
| if (s->duration != AV_NOPTS_VALUE) |
| return 0; |
| |
| size = avio_size(s->pb); |
| if (size < 0) |
| return 0; |
| end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0; |
| |
| ret = ogg_save(s); |
| if (ret < 0) |
| return ret; |
| avio_seek(s->pb, end, SEEK_SET); |
| ogg->page_pos = -1; |
| |
| while (!ogg_read_page(s, &i)) { |
| if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 && |
| ogg->streams[i].codec) { |
| s->streams[i]->duration = |
| ogg_gptopts(s, i, ogg->streams[i].granule, NULL); |
| if (s->streams[i]->start_time != AV_NOPTS_VALUE) { |
| s->streams[i]->duration -= s->streams[i]->start_time; |
| streams_left-= (ogg->streams[i].got_start==-1); |
| ogg->streams[i].got_start= 1; |
| } else if(!ogg->streams[i].got_start) { |
| ogg->streams[i].got_start= -1; |
| streams_left++; |
| } |
| } |
| } |
| |
| ogg_restore(s, 0); |
| |
| ret = ogg_save(s); |
| if (ret < 0) |
| return ret; |
| |
| avio_seek (s->pb, s->internal->data_offset, SEEK_SET); |
| ogg_reset(s); |
| while (streams_left > 0 && !ogg_packet(s, &i, NULL, NULL, NULL)) { |
| int64_t pts; |
| if (i < 0) continue; |
| pts = ogg_calc_pts(s, i, NULL); |
| if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) { |
| s->streams[i]->duration -= pts; |
| ogg->streams[i].got_start= 1; |
| streams_left--; |
| }else if(s->streams[i]->start_time != AV_NOPTS_VALUE && !ogg->streams[i].got_start) { |
| ogg->streams[i].got_start= 1; |
| streams_left--; |
| } |
| } |
| ogg_restore (s, 0); |
| |
| return 0; |
| } |
| |
| static int ogg_read_close(AVFormatContext *s) |
| { |
| struct ogg *ogg = s->priv_data; |
| int i; |
| |
| for (i = 0; i < ogg->nstreams; i++) { |
| av_freep(&ogg->streams[i].buf); |
| if (ogg->streams[i].codec && |
| ogg->streams[i].codec->cleanup) { |
| ogg->streams[i].codec->cleanup(s, i); |
| } |
| av_freep(&ogg->streams[i].private); |
| av_freep(&ogg->streams[i].new_metadata); |
| } |
| |
| ogg->nstreams = 0; |
| |
| av_freep(&ogg->streams); |
| return 0; |
| } |
| |
| static int ogg_read_header(AVFormatContext *s) |
| { |
| struct ogg *ogg = s->priv_data; |
| int ret, i; |
| |
| ogg->curidx = -1; |
| |
| //linear headers seek from start |
| do { |
| ret = ogg_packet(s, NULL, NULL, NULL, NULL); |
| if (ret < 0) { |
| ogg_read_close(s); |
| return ret; |
| } |
| } while (!ogg->headers); |
| av_log(s, AV_LOG_TRACE, "found headers\n"); |
| |
| for (i = 0; i < ogg->nstreams; i++) { |
| struct ogg_stream *os = ogg->streams + i; |
| |
| if (ogg->streams[i].header < 0) { |
| av_log(s, AV_LOG_ERROR, "Header parsing failed for stream %d\n", i); |
| ogg->streams[i].codec = NULL; |
| } else if (os->codec && os->nb_header < os->codec->nb_header) { |
| av_log(s, AV_LOG_WARNING, |
| "Headers mismatch for stream %d: " |
| "expected %d received %d.\n", |
| i, os->codec->nb_header, os->nb_header); |
| if (s->error_recognition & AV_EF_EXPLODE) |
| return AVERROR_INVALIDDATA; |
| } |
| if (os->start_granule != OGG_NOGRANULE_VALUE) |
| os->lastpts = s->streams[i]->start_time = |
| ogg_gptopts(s, i, os->start_granule, NULL); |
| } |
| |
| //linear granulepos seek from end |
| ret = ogg_get_length(s); |
| if (ret < 0) { |
| ogg_read_close(s); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + idx; |
| int64_t pts = AV_NOPTS_VALUE; |
| |
| if (dts) |
| *dts = AV_NOPTS_VALUE; |
| |
| if (os->lastpts != AV_NOPTS_VALUE) { |
| pts = os->lastpts; |
| os->lastpts = AV_NOPTS_VALUE; |
| } |
| if (os->lastdts != AV_NOPTS_VALUE) { |
| if (dts) |
| *dts = os->lastdts; |
| os->lastdts = AV_NOPTS_VALUE; |
| } |
| if (os->page_end) { |
| if (os->granule != -1LL) { |
| if (os->codec && os->codec->granule_is_start) |
| pts = ogg_gptopts(s, idx, os->granule, dts); |
| else |
| os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts); |
| os->granule = -1LL; |
| } |
| } |
| return pts; |
| } |
| |
| static void ogg_validate_keyframe(AVFormatContext *s, int idx, int pstart, int psize) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + idx; |
| int invalid = 0; |
| if (psize) { |
| switch (s->streams[idx]->codec->codec_id) { |
| case AV_CODEC_ID_THEORA: |
| invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 0x40); |
| break; |
| case AV_CODEC_ID_VP8: |
| invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 1); |
| } |
| if (invalid) { |
| os->pflags ^= AV_PKT_FLAG_KEY; |
| av_log(s, AV_LOG_WARNING, "Broken file, %skeyframe not correctly marked.\n", |
| (os->pflags & AV_PKT_FLAG_KEY) ? "" : "non-"); |
| } |
| } |
| } |
| |
| static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| struct ogg *ogg; |
| struct ogg_stream *os; |
| int idx, ret; |
| int pstart, psize; |
| int64_t fpos, pts, dts; |
| |
| if (s->io_repositioned) { |
| ogg_reset(s); |
| s->io_repositioned = 0; |
| } |
| |
| //Get an ogg packet |
| retry: |
| do { |
| ret = ogg_packet(s, &idx, &pstart, &psize, &fpos); |
| if (ret < 0) |
| return ret; |
| } while (idx < 0 || !s->streams[idx]); |
| |
| ogg = s->priv_data; |
| os = ogg->streams + idx; |
| |
| // pflags might not be set until after this |
| pts = ogg_calc_pts(s, idx, &dts); |
| ogg_validate_keyframe(s, idx, pstart, psize); |
| |
| if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY)) |
| goto retry; |
| os->keyframe_seek = 0; |
| |
| //Alloc a pkt |
| ret = av_new_packet(pkt, psize); |
| if (ret < 0) |
| return ret; |
| pkt->stream_index = idx; |
| memcpy(pkt->data, os->buf + pstart, psize); |
| |
| pkt->pts = pts; |
| pkt->dts = dts; |
| pkt->flags = os->pflags; |
| pkt->duration = os->pduration; |
| pkt->pos = fpos; |
| |
| if (os->end_trimming) { |
| uint8_t *side_data = av_packet_new_side_data(pkt, |
| AV_PKT_DATA_SKIP_SAMPLES, |
| 10); |
| if(!side_data) |
| goto fail; |
| AV_WL32(side_data + 4, os->end_trimming); |
| os->end_trimming = 0; |
| } |
| |
| if (os->new_metadata) { |
| uint8_t *side_data = av_packet_new_side_data(pkt, |
| AV_PKT_DATA_METADATA_UPDATE, |
| os->new_metadata_size); |
| if(!side_data) |
| goto fail; |
| |
| memcpy(side_data, os->new_metadata, os->new_metadata_size); |
| av_freep(&os->new_metadata); |
| os->new_metadata_size = 0; |
| } |
| |
| return psize; |
| fail: |
| av_packet_unref(pkt); |
| return AVERROR(ENOMEM); |
| } |
| |
| static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index, |
| int64_t *pos_arg, int64_t pos_limit) |
| { |
| struct ogg *ogg = s->priv_data; |
| AVIOContext *bc = s->pb; |
| int64_t pts = AV_NOPTS_VALUE; |
| int64_t keypos = -1; |
| int i; |
| int pstart, psize; |
| avio_seek(bc, *pos_arg, SEEK_SET); |
| ogg_reset(s); |
| |
| while ( avio_tell(bc) <= pos_limit |
| && !ogg_packet(s, &i, &pstart, &psize, pos_arg)) { |
| if (i == stream_index) { |
| struct ogg_stream *os = ogg->streams + stream_index; |
| // Do not trust the last timestamps of a ogm video |
| if ( (os->flags & OGG_FLAG_EOS) |
| && !(os->flags & OGG_FLAG_BOS) |
| && os->codec == &ff_ogm_video_codec) |
| continue; |
| pts = ogg_calc_pts(s, i, NULL); |
| ogg_validate_keyframe(s, i, pstart, psize); |
| if (os->pflags & AV_PKT_FLAG_KEY) { |
| keypos = *pos_arg; |
| } else if (os->keyframe_seek) { |
| // if we had a previous keyframe but no pts for it, |
| // return that keyframe with this pts value. |
| if (keypos >= 0) |
| *pos_arg = keypos; |
| else |
| pts = AV_NOPTS_VALUE; |
| } |
| } |
| if (pts != AV_NOPTS_VALUE) |
| break; |
| } |
| ogg_reset(s); |
| return pts; |
| } |
| |
| static int ogg_read_seek(AVFormatContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + stream_index; |
| int ret; |
| |
| av_assert0(stream_index < ogg->nstreams); |
| // Ensure everything is reset even when seeking via |
| // the generated index. |
| ogg_reset(s); |
| |
| // Try seeking to a keyframe first. If this fails (very possible), |
| // av_seek_frame will fall back to ignoring keyframes |
| if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO |
| && !(flags & AVSEEK_FLAG_ANY)) |
| os->keyframe_seek = 1; |
| |
| ret = ff_seek_frame_binary(s, stream_index, timestamp, flags); |
| ogg_reset(s); |
| os = ogg->streams + stream_index; |
| if (ret < 0) |
| os->keyframe_seek = 0; |
| return ret; |
| } |
| |
| static int ogg_probe(AVProbeData *p) |
| { |
| if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7) |
| return AVPROBE_SCORE_MAX; |
| return 0; |
| } |
| |
| AVInputFormat ff_ogg_demuxer = { |
| .name = "ogg", |
| .long_name = NULL_IF_CONFIG_SMALL("Ogg"), |
| .priv_data_size = sizeof(struct ogg), |
| .read_probe = ogg_probe, |
| .read_header = ogg_read_header, |
| .read_packet = ogg_read_packet, |
| .read_close = ogg_read_close, |
| .read_seek = ogg_read_seek, |
| .read_timestamp = ogg_read_timestamp, |
| .extensions = "ogg", |
| .flags = AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT | AVFMT_NOBINSEARCH, |
| }; |
