Revision 3feb44a9

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libavformat/Makefile
113 113
                                            riff.o
114 114
OBJS-$(CONFIG_OGG_MUXER)                 += oggenc.o
115 115
OBJS-$(CONFIG_PSP_MUXER)                 += movenc.o riff.o isom.o
116
OBJS-$(CONFIG_PVA_DEMUXER)               += pva.o
116 117
OBJS-$(CONFIG_RAWVIDEO_DEMUXER)          += raw.o
117 118
OBJS-$(CONFIG_RAWVIDEO_MUXER)            += raw.o
118 119
OBJS-$(CONFIG_REDIR_DEMUXER)             += rtsp.o
libavformat/allformats.c
129 129
    REGISTER_MUXDEMUX (PCM_U16LE, pcm_u16le);
130 130
    REGISTER_MUXDEMUX (PCM_U8,    pcm_u8);
131 131
    REGISTER_MUXER    (PSP, psp);
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    REGISTER_DEMUXER  (PVA, pva);
132 133
    REGISTER_MUXDEMUX (RAWVIDEO, rawvideo);
133 134
    REGISTER_MUXDEMUX (RM, rm);
134 135
    REGISTER_MUXDEMUX (ROQ, roq);
libavformat/pva.c
1
/*
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 * TechnoTrend PVA (.pva) demuxer
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 * Copyright (c) 2007, 2008 Ivo van Poorten
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
23

  
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#define PVA_MAX_PAYLOAD_LENGTH  0x17f8
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#define PVA_VIDEO_PAYLOAD       0x01
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#define PVA_AUDIO_PAYLOAD       0x02
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#define PVA_MAGIC               (('A' << 8) + 'V')
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typedef struct {
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    int continue_pes;
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} PVAContext;
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static int pva_probe(AVProbeData * pd) {
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    unsigned char *buf = pd->buf;
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    if (AV_RB16(buf) == PVA_MAGIC && buf[2] && buf[2] < 3 && buf[4] == 0x55)
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        return AVPROBE_SCORE_MAX / 2;
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    return 0;
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}
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static int pva_read_header(AVFormatContext *s, AVFormatParameters *ap) {
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    AVStream *st;
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    if (!(st = av_new_stream(s, 0)))
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = CODEC_TYPE_VIDEO;
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    st->codec->codec_id   = CODEC_ID_MPEG2VIDEO;
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    st->need_parsing      = AVSTREAM_PARSE_FULL;
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    av_set_pts_info(st, 32, 1, 90000);
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    if (!(st = av_new_stream(s, 1)))
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = CODEC_TYPE_AUDIO;
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    st->codec->codec_id   = CODEC_ID_MP3;
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    st->need_parsing      = AVSTREAM_PARSE_HEADERS;
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    av_set_pts_info(st, 33, 1, 90000);
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    /* the parameters will be extracted from the compressed bitstream */
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    return 0;
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}
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static int pva_read_packet(AVFormatContext *s, AVPacket *pkt) {
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    ByteIOContext *pb = s->pb;
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    PVAContext *pvactx = s->priv_data;
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    int ret, syncword, streamid, reserved, flags, length, pts_flag;
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    long long pva_pts = 0;
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    syncword = get_be16(pb);
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    streamid = get_byte(pb);
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    get_byte(pb);               /* counter not used */
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    reserved = get_byte(pb);
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    flags    = get_byte(pb);
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    length   = get_be16(pb);
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    pts_flag  = (flags & 0x10) >> 4;
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    if (syncword != PVA_MAGIC) {
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        av_log(s, AV_LOG_ERROR, "invalid syncword\n");
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        return AVERROR(EIO);
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    }
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    if (reserved != 0x55) {
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        av_log(s, AV_LOG_WARNING, "expected reserved byte to be 0x55\n");
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    }
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    if (length > PVA_MAX_PAYLOAD_LENGTH) {
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        av_log(s, AV_LOG_ERROR, "invalid payload length %u\n", length);
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        return AVERROR(EIO);
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    }
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    if (streamid == PVA_VIDEO_PAYLOAD && pts_flag) {
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        pva_pts = get_be32(pb);
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        length -= 4;
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    } else if (streamid == PVA_AUDIO_PAYLOAD) {
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        /* PVA Audio Packets either start with a signaled PES packet or
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         * are a continuation of the previous PES packet. New PES packets
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         * always start at the beginning of a PVA Packet, never somewhere in
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         * the middle. */
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        if (!pvactx->continue_pes) {
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            int pes_signal, pes_header_data_length, pes_packet_length,
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                pes_flags;
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            unsigned char pes_header_data[256];
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            pes_signal             = get_be24(pb);
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            get_byte(pb);
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            pes_packet_length      = get_be16(pb);
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            pes_flags              = get_be16(pb);
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            pes_header_data_length = get_byte(pb);
108

  
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            if (pes_signal != 1) {
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                av_log(s, AV_LOG_ERROR, "expected signaled PES packet\n");
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                return AVERROR(EIO);
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            }
113

  
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            get_buffer(pb, pes_header_data, pes_header_data_length);
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            length -= 9 + pes_header_data_length;
116

  
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            pes_packet_length -= 3 + pes_header_data_length;
118

  
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            pvactx->continue_pes = pes_packet_length;
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            if (pes_flags & 0x80 && (pes_header_data[0] & 0xf0) == 0x20) {
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                pva_pts  = ((long long) *pes_header_data & 0x0e) << 29;
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                pva_pts += (AV_RB16(pes_header_data+1) >> 1) << 15;
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                pva_pts +=  AV_RB16(pes_header_data+3) >> 1;
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            }
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        }
127

  
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        pvactx->continue_pes -= length;
129

  
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        if (pvactx->continue_pes < 0) {
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            av_log(s, AV_LOG_WARNING, "audio data corruption\n");
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            pvactx->continue_pes = 0;
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        }
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    }
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    if ((ret = av_get_packet(pb, pkt, length)) <= 0)
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        return AVERROR(EIO);
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    pkt->stream_index = streamid - 1;
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    if (pva_pts)
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        pkt->pts = pva_pts;
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    return ret;
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}
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AVInputFormat pva_demuxer = {
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    "pva",
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    "pva file and stream format",
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    sizeof(PVAContext),
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    pva_probe,
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    pva_read_header,
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    pva_read_packet,
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};

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