static int read_gab2_sub(AVStream *st, AVPacket *pkt) { if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) { uint8_t desc[256]; int score = AVPROBE_SCORE_MAX / 2, ret; AVIStream *ast = st->priv_data; AVInputFormat *sub_demuxer; AVRational time_base; AVIOContext *pb = avio_alloc_context( pkt->data + 7, pkt->size - 7, 0, NULL, NULL, NULL, NULL); AVProbeData pd; unsigned int desc_len = avio_rl32(pb); if (desc_len > pb->buf_end - pb->buf_ptr) goto error; ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); avio_skip(pb, desc_len - ret); if (*desc) av_dict_set(&st->metadata, "title", desc, 0); avio_rl16(pb); /* flags? */ avio_rl32(pb); /* data size */ pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr }; if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score))) goto error; if (!(ast->sub_ctx = avformat_alloc_context())) goto error; ast->sub_ctx->pb = pb; if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { ff_read_packet(ast->sub_ctx, &ast->sub_pkt); *st->codec = *ast->sub_ctx->streams[0]->codec; ast->sub_ctx->streams[0]->codec->extradata = NULL; time_base = ast->sub_ctx->streams[0]->time_base; avpriv_set_pts_info(st, 64, time_base.num, time_base.den); } ast->sub_buffer = pkt->data; memset(pkt, 0, sizeof(*pkt)); return 1; error: av_freep(&pb); } return 0; }