static int tta_read_header(AVFormatContext *s) { TTAContext *c = s->priv_data; AVStream *st; int i, channels, bps, samplerate; uint64_t framepos, start_offset; uint32_t datalen; if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) ff_id3v1_read(s); start_offset = avio_tell(s->pb); if (avio_rl32(s->pb) != AV_RL32("TTA1")) return -1; // not tta file avio_skip(s->pb, 2); // FIXME: flags channels = avio_rl16(s->pb); bps = avio_rl16(s->pb); samplerate = avio_rl32(s->pb); if(samplerate <= 0 || samplerate > 1000000){ av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); return -1; } datalen = avio_rl32(s->pb); if (!datalen) { av_log(s, AV_LOG_ERROR, "invalid datalen\n"); return AVERROR_INVALIDDATA; } avio_skip(s->pb, 4); // header crc c->frame_size = samplerate * 256 / 245; c->last_frame_size = datalen % c->frame_size; if (!c->last_frame_size) c->last_frame_size = c->frame_size; c->totalframes = datalen / c->frame_size + (c->last_frame_size < c->frame_size); c->currentframe = 0; if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){ av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes); return -1; } st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, samplerate); st->start_time = 0; st->duration = datalen; framepos = avio_tell(s->pb) + 4*c->totalframes + 4; for (i = 0; i < c->totalframes; i++) { uint32_t size = avio_rl32(s->pb); av_add_index_entry(st, framepos, i * c->frame_size, size, 0, AVINDEX_KEYFRAME); framepos += size; } avio_skip(s->pb, 4); // seektable crc st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = AV_CODEC_ID_TTA; st->codec->channels = channels; st->codec->sample_rate = samplerate; st->codec->bits_per_coded_sample = bps; st->codec->extradata_size = avio_tell(s->pb) - start_offset; if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ //this check is redundant as avio_read should fail av_log(s, AV_LOG_ERROR, "extradata_size too large\n"); return -1; } st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) { st->codec->extradata_size = 0; return AVERROR(ENOMEM); } avio_seek(s->pb, start_offset, SEEK_SET); avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); return 0; }