static int pva_read_packet(AVFormatContext *s, AVPacket *pkt) { ByteIOContext *pb = s->pb; PVAContext *pvactx = s->priv_data; int ret, syncword, streamid, reserved, flags, length, pts_flag; int64_t pva_pts = AV_NOPTS_VALUE; recover: syncword = get_be16(pb); streamid = get_byte(pb); get_byte(pb); /* counter not used */ reserved = get_byte(pb); flags = get_byte(pb); length = get_be16(pb); pts_flag = flags & 0x10; if (syncword != PVA_MAGIC) { av_log(s, AV_LOG_ERROR, "invalid syncword\n"); return AVERROR(EIO); } if (streamid != PVA_VIDEO_PAYLOAD && streamid != PVA_AUDIO_PAYLOAD) { av_log(s, AV_LOG_ERROR, "invalid streamid\n"); return AVERROR(EIO); } if (reserved != 0x55) { av_log(s, AV_LOG_WARNING, "expected reserved byte to be 0x55\n"); } if (length > PVA_MAX_PAYLOAD_LENGTH) { av_log(s, AV_LOG_ERROR, "invalid payload length %u\n", length); return AVERROR(EIO); } if (streamid == PVA_VIDEO_PAYLOAD && pts_flag) { pva_pts = get_be32(pb); length -= 4; } else if (streamid == PVA_AUDIO_PAYLOAD) { /* PVA Audio Packets either start with a signaled PES packet or * are a continuation of the previous PES packet. New PES packets * always start at the beginning of a PVA Packet, never somewhere in * the middle. */ if (!pvactx->continue_pes) { int pes_signal, pes_header_data_length, pes_packet_length, pes_flags; unsigned char pes_header_data[256]; pes_signal = get_be24(pb); get_byte(pb); pes_packet_length = get_be16(pb); pes_flags = get_be16(pb); pes_header_data_length = get_byte(pb); if (pes_signal != 1) { av_log(s, AV_LOG_WARNING, "expected signaled PES packet, " "trying to recover\n"); url_fskip(pb, length - 9); goto recover; } get_buffer(pb, pes_header_data, pes_header_data_length); length -= 9 + pes_header_data_length; pes_packet_length -= 3 + pes_header_data_length; pvactx->continue_pes = pes_packet_length; if (pes_flags & 0x80 && (pes_header_data[0] & 0xf0) == 0x20) pva_pts = ff_parse_pes_pts(pes_header_data); } pvactx->continue_pes -= length; if (pvactx->continue_pes < 0) { av_log(s, AV_LOG_WARNING, "audio data corruption\n"); pvactx->continue_pes = 0; } } if ((ret = av_get_packet(pb, pkt, length)) <= 0) return AVERROR(EIO); pkt->stream_index = streamid - 1; if (pva_pts != AV_NOPTS_VALUE) pkt->pts = pva_pts; return ret; }