static int mov_write_trailer(AVFormatContext *s) { MOVMuxContext *mov = s->priv_data; AVIOContext *pb = s->pb; int res = 0; int i; int64_t moov_pos; /* * Before actually writing the trailer, make sure that there are no * dangling subtitles, that need a terminating sample. */ for (i = 0; i < mov->nb_streams; i++) { MOVTrack *trk = &mov->tracks[i]; if (trk->enc->codec_id == AV_CODEC_ID_MOV_TEXT && !trk->last_sample_is_subtitle_end) { mov_write_subtitle_end_packet(s, i, trk->track_duration); trk->last_sample_is_subtitle_end = 1; } } // If there were no chapters when the header was written, but there // are chapters now, write them in the trailer. This only works // when we are not doing fragments. if (!mov->chapter_track && !(mov->flags & FF_MOV_FLAG_FRAGMENT)) { if (mov->mode & (MODE_MP4|MODE_MOV|MODE_IPOD) && s->nb_chapters) { mov->chapter_track = mov->nb_streams++; if ((res = mov_create_chapter_track(s, mov->chapter_track)) < 0) goto error; } } if (!(mov->flags & FF_MOV_FLAG_FRAGMENT)) { moov_pos = avio_tell(pb); /* Write size of mdat tag */ if (mov->mdat_size + 8 <= UINT32_MAX) { avio_seek(pb, mov->mdat_pos, SEEK_SET); avio_wb32(pb, mov->mdat_size + 8); } else { /* overwrite 'wide' placeholder atom */ avio_seek(pb, mov->mdat_pos - 8, SEEK_SET); /* special value: real atom size will be 64 bit value after * tag field */ avio_wb32(pb, 1); ffio_wfourcc(pb, "mdat"); avio_wb64(pb, mov->mdat_size + 16); } avio_seek(pb, mov->reserved_moov_size > 0 ? mov->reserved_moov_pos : moov_pos, SEEK_SET); if (mov->flags & FF_MOV_FLAG_FASTSTART) { av_log(s, AV_LOG_INFO, "Starting second pass: moving the moov atom to the beginning of the file\n"); res = shift_data(s); if (res == 0) { avio_seek(s->pb, mov->reserved_moov_pos, SEEK_SET); mov_write_moov_tag(pb, mov, s); } } else if (mov->reserved_moov_size > 0) { int64_t size; mov_write_moov_tag(pb, mov, s); size = mov->reserved_moov_size - (avio_tell(pb) - mov->reserved_moov_pos); if (size < 8){ av_log(s, AV_LOG_ERROR, "reserved_moov_size is too small, needed %"PRId64" additional\n", 8-size); return -1; } avio_wb32(pb, size); ffio_wfourcc(pb, "free"); for (i = 0; i < size; i++) avio_w8(pb, 0); avio_seek(pb, moov_pos, SEEK_SET); } else { mov_write_moov_tag(pb, mov, s); } } else { mov_flush_fragment(s); mov_write_mfra_tag(pb, mov); } for (i = 0; i < mov->nb_streams; i++) { if (mov->flags & FF_MOV_FLAG_FRAGMENT && mov->tracks[i].vc1_info.struct_offset && s->pb->seekable) { int64_t off = avio_tell(pb); uint8_t buf[7]; if (mov_write_dvc1_structs(&mov->tracks[i], buf) >= 0) { avio_seek(pb, mov->tracks[i].vc1_info.struct_offset, SEEK_SET); avio_write(pb, buf, 7); avio_seek(pb, off, SEEK_SET); } } } error: mov_free(s); return res; }
static int mov_write_trailer(AVFormatContext *s) { MOVMuxContext *mov = s->priv_data; AVIOContext *pb = s->pb; int res = 0; int i; int64_t moov_pos;   for (i = 0; i < mov->nb_streams; i++) { MOVTrack *trk = &mov->tracks[i]; if (trk->enc->codec_id == AV_CODEC_ID_MOV_TEXT && !trk->last_sample_is_subtitle_end) { mov_write_subtitle_end_packet(s, i, trk->track_duration); trk->last_sample_is_subtitle_end = 1; } }  