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https://github.com/FFmpeg/FFmpeg.git
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add ff_parse_mpeg2_descriptor; make MPEG2 descriptor parsing routines available to other modules.
Originally committed as revision 26125 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross
parent
0af1671e53
commit
cc9038e95c
@ -893,16 +893,101 @@ static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
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return 0;
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}
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int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
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const uint8_t **pp, const uint8_t *desc_list_end,
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int mp4_dec_config_descr_len, int mp4_es_id, int pid,
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uint8_t *mp4_dec_config_descr)
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{
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const uint8_t *desc_end;
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int desc_len, desc_tag;
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char language[4];
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desc_tag = get8(pp, desc_list_end);
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if (desc_tag < 0)
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return -1;
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desc_len = get8(pp, desc_list_end);
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if (desc_len < 0)
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return -1;
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desc_end = *pp + desc_len;
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if (desc_end > desc_list_end)
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return -1;
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dprintf(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
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if (st->codec->codec_id == CODEC_ID_NONE &&
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stream_type == STREAM_TYPE_PRIVATE_DATA)
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mpegts_find_stream_type(st, desc_tag, DESC_types);
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switch(desc_tag) {
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case 0x1F: /* FMC descriptor */
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get16(pp, desc_end);
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if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
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mp4_dec_config_descr_len && mp4_es_id == pid) {
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ByteIOContext pb;
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init_put_byte(&pb, mp4_dec_config_descr,
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mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
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ff_mp4_read_dec_config_descr(fc, st, &pb);
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if (st->codec->codec_id == CODEC_ID_AAC &&
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st->codec->extradata_size > 0)
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st->need_parsing = 0;
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}
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break;
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case 0x56: /* DVB teletext descriptor */
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language[0] = get8(pp, desc_end);
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language[1] = get8(pp, desc_end);
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language[2] = get8(pp, desc_end);
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language[3] = 0;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x59: /* subtitling descriptor */
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language[0] = get8(pp, desc_end);
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language[1] = get8(pp, desc_end);
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language[2] = get8(pp, desc_end);
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language[3] = 0;
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get8(pp, desc_end);
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if (st->codec->extradata) {
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if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
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av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
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} else {
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st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
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if (st->codec->extradata) {
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st->codec->extradata_size = 4;
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memcpy(st->codec->extradata, *pp, 4);
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}
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}
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*pp += 4;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x0a: /* ISO 639 language descriptor */
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language[0] = get8(pp, desc_end);
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language[1] = get8(pp, desc_end);
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language[2] = get8(pp, desc_end);
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language[3] = 0;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x05: /* registration descriptor */
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st->codec->codec_tag = bytestream_get_le32(pp);
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dprintf(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
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if (st->codec->codec_id == CODEC_ID_NONE &&
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stream_type == STREAM_TYPE_PRIVATE_DATA)
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mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
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break;
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default:
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break;
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}
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*pp = desc_end;
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return 0;
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}
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static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
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{
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MpegTSContext *ts = filter->u.section_filter.opaque;
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SectionHeader h1, *h = &h1;
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PESContext *pes;
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AVStream *st;
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const uint8_t *p, *p_end, *desc_list_end, *desc_end;
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const uint8_t *p, *p_end, *desc_list_end;
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int program_info_length, pcr_pid, pid, stream_type;
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int desc_list_len, desc_len, desc_tag;
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char language[4];
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int desc_list_len;
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uint32_t prog_reg_desc = 0; /* registration descriptor */
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uint8_t *mp4_dec_config_descr = NULL;
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int mp4_dec_config_descr_len = 0;
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@ -1005,81 +1090,9 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
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if (desc_list_end > p_end)
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break;
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for(;;) {
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desc_tag = get8(&p, desc_list_end);
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if (desc_tag < 0)
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if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
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mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
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break;
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desc_len = get8(&p, desc_list_end);
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if (desc_len < 0)
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break;
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desc_end = p + desc_len;
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if (desc_end > desc_list_end)
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break;
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dprintf(ts->stream, "tag: 0x%02x len=%d\n",
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desc_tag, desc_len);
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if (st->codec->codec_id == CODEC_ID_NONE &&
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stream_type == STREAM_TYPE_PRIVATE_DATA)
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mpegts_find_stream_type(st, desc_tag, DESC_types);
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switch(desc_tag) {
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case 0x1F: /* FMC descriptor */
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get16(&p, desc_end);
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if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
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mp4_dec_config_descr_len && mp4_es_id == pid) {
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ByteIOContext pb;
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init_put_byte(&pb, mp4_dec_config_descr,
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mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
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ff_mp4_read_dec_config_descr(ts->stream, st, &pb);
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if (st->codec->codec_id == CODEC_ID_AAC &&
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st->codec->extradata_size > 0)
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st->need_parsing = 0;
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}
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break;
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case 0x56: /* DVB teletext descriptor */
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language[0] = get8(&p, desc_end);
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language[1] = get8(&p, desc_end);
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language[2] = get8(&p, desc_end);
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language[3] = 0;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x59: /* subtitling descriptor */
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language[0] = get8(&p, desc_end);
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language[1] = get8(&p, desc_end);
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language[2] = get8(&p, desc_end);
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language[3] = 0;
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get8(&p, desc_end);
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if (st->codec->extradata) {
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if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, p, 4))
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av_log_ask_for_sample(ts->stream, "DVB sub with multiple IDs\n");
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} else {
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st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
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if (st->codec->extradata) {
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st->codec->extradata_size = 4;
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memcpy(st->codec->extradata, p, 4);
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}
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}
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p += 4;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x0a: /* ISO 639 language descriptor */
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language[0] = get8(&p, desc_end);
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language[1] = get8(&p, desc_end);
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language[2] = get8(&p, desc_end);
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language[3] = 0;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x05: /* registration descriptor */
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st->codec->codec_tag = bytestream_get_le32(&p);
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dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
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if (st->codec->codec_id == CODEC_ID_NONE &&
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stream_type == STREAM_TYPE_PRIVATE_DATA)
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mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
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break;
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default:
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break;
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}
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p = desc_end;
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if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
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ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
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@ -63,4 +63,22 @@ int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
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const uint8_t *buf, int len);
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void ff_mpegts_parse_close(MpegTSContext *ts);
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/**
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* Parse an MPEG-2 descriptor
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* @param[in] fc Format context (used for logging only)
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* @param st Stream
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* @param stream_type STREAM_TYPE_xxx
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* @param pp Descriptor buffer pointer
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* @param desc_list_end End of buffer
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* @param mp4_dec_config_descr_len Length of 'mp4_dec_config_descr', or zero if not present
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* @param mp4_es_id
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* @param pid
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* @param mp4_dec_config_descr
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* @return <0 to stop processing
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*/
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int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
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const uint8_t **pp, const uint8_t *desc_list_end,
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int mp4_dec_config_descr_len, int mp4_es_id, int pid,
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uint8_t *mp4_dec_config_descr);
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#endif /* AVFORMAT_MPEGTS_H */
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