static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt) { AvsFormat *avs = s->priv_data; int ret, size; size = avio_tell(s->pb); ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size); size = avio_tell(s->pb) - size; avs->remaining_audio_size -= size; if (ret == AVERROR(EIO)) return 0; /* this indicate EOS */ if (ret < 0) return ret; pkt->stream_index = avs->st_audio->index; pkt->flags |= AV_PKT_FLAG_KEY; return size; }
static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) { return ff_voc_get_packet(s, pkt, s->streams[0], 0); }
static int read_packet(AVFormatContext *s, AVPacket *pkt) { AVIOContext *pb = s->pb; C93DemuxContext *c93 = s->priv_data; C93BlockRecord *br = &c93->block_records[c93->current_block]; int datasize; int ret, i; if (c93->next_pkt_is_audio) { c93->current_frame++; c93->next_pkt_is_audio = 0; datasize = avio_rl16(pb); if (datasize > 42) { if (!c93->audio) { c93->audio = avformat_new_stream(s, NULL); if (!c93->audio) return AVERROR(ENOMEM); c93->audio->codec->codec_type = AVMEDIA_TYPE_AUDIO; } avio_skip(pb, 26); /* VOC header */ ret = ff_voc_get_packet(s, pkt, c93->audio, datasize - 26); if (ret > 0) { pkt->stream_index = 1; pkt->flags |= AV_PKT_FLAG_KEY; return ret; } } } if (c93->current_frame >= br->frames) { if (c93->current_block >= 511 || !br[1].length) return AVERROR(EIO); br++; c93->current_block++; c93->current_frame = 0; } if (c93->current_frame == 0) { avio_seek(pb, br->index * 2048, SEEK_SET); for (i = 0; i < 32; i++) { c93->frame_offsets[i] = avio_rl32(pb); } } avio_seek(pb,br->index * 2048 + c93->frame_offsets[c93->current_frame], SEEK_SET); datasize = avio_rl16(pb); /* video frame size */ ret = av_new_packet(pkt, datasize + 768 + 1); if (ret < 0) return ret; pkt->data[0] = 0; pkt->size = datasize + 1; ret = avio_read(pb, pkt->data + 1, datasize); if (ret < datasize) { ret = AVERROR(EIO); goto fail; } datasize = avio_rl16(pb); /* palette size */ if (datasize) { if (datasize != 768) { av_log(s, AV_LOG_ERROR, "invalid palette size %u\n", datasize); ret = AVERROR_INVALIDDATA; goto fail; } pkt->data[0] |= C93_HAS_PALETTE; ret = avio_read(pb, pkt->data + pkt->size, datasize); if (ret < datasize) { ret = AVERROR(EIO); goto fail; } pkt->size += 768; } pkt->stream_index = 0; c93->next_pkt_is_audio = 1; /* only the first frame is guaranteed to not reference previous frames */ if (c93->current_block == 0 && c93->current_frame == 0) { pkt->flags |= AV_PKT_FLAG_KEY; pkt->data[0] |= C93_FIRST_FRAME; } return 0; fail: av_free_packet(pkt); return ret; }