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ffmpeg / libavformat / idroqdec.c @ b7effd4e

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/*
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 * id RoQ (.roq) File Demuxer
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 * Copyright (c) 2003 The ffmpeg Project
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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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/**
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 * @file
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 * id RoQ format file demuxer
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 * by Mike Melanson (melanson@pcisys.net)
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 * for more information on the .roq file format, visit:
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 *   http://www.csse.monash.edu.au/~timf/
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 */
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#define RoQ_MAGIC_NUMBER 0x1084
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#define RoQ_CHUNK_PREAMBLE_SIZE 8
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#define RoQ_AUDIO_SAMPLE_RATE 22050
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#define RoQ_CHUNKS_TO_SCAN 30
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#define RoQ_INFO           0x1001
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#define RoQ_QUAD_CODEBOOK  0x1002
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#define RoQ_QUAD_VQ        0x1011
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#define RoQ_SOUND_MONO     0x1020
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#define RoQ_SOUND_STEREO   0x1021
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typedef struct RoqDemuxContext {
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    int width;
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    int height;
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    int audio_channels;
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    int video_stream_index;
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    int audio_stream_index;
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    int64_t video_pts;
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    unsigned int audio_frame_count;
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} RoqDemuxContext;
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static int roq_probe(AVProbeData *p)
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{
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    if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
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        (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
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        return 0;
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    return AVPROBE_SCORE_MAX;
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}
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static int roq_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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{
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    RoqDemuxContext *roq = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int framerate;
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    AVStream *st;
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    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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    /* get the main header */
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    if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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        RoQ_CHUNK_PREAMBLE_SIZE)
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        return AVERROR(EIO);
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    framerate = AV_RL16(&preamble[6]);
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    /* init private context parameters */
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    roq->width = roq->height = roq->audio_channels = roq->video_pts =
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    roq->audio_frame_count = 0;
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    roq->audio_stream_index = -1;
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    av_set_pts_info(st, 63, 1, framerate);
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    roq->video_stream_index = st->index;
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_ROQ;
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    st->codec->codec_tag = 0;  /* no fourcc */
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    return 0;
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}
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static int roq_read_packet(AVFormatContext *s,
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                           AVPacket *pkt)
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{
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    RoqDemuxContext *roq = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int ret = 0;
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    unsigned int chunk_size;
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    unsigned int chunk_type;
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    unsigned int codebook_size;
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    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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    int packet_read = 0;
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    int64_t codebook_offset;
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    while (!packet_read) {
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        if (url_feof(s->pb))
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            return AVERROR(EIO);
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        /* get the next chunk preamble */
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        if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
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            RoQ_CHUNK_PREAMBLE_SIZE)
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            return AVERROR(EIO);
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        chunk_type = AV_RL16(&preamble[0]);
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        chunk_size = AV_RL32(&preamble[2]);
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        if(chunk_size > INT_MAX)
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            return AVERROR_INVALIDDATA;
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        switch (chunk_type) {
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        case RoQ_INFO:
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            if (!roq->width || !roq->height) {
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                AVStream *st = s->streams[roq->video_stream_index];
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                if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
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                    return AVERROR(EIO);
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                st->codec->width  = roq->width  = AV_RL16(preamble);
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                st->codec->height = roq->height = AV_RL16(preamble + 2);
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                break;
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            }
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            /* don't care about this chunk anymore */
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            url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
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            break;
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        case RoQ_QUAD_CODEBOOK:
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            /* packet needs to contain both this codebook and next VQ chunk */
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            codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
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            codebook_size = chunk_size;
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            url_fseek(pb, codebook_size, SEEK_CUR);
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            if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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                RoQ_CHUNK_PREAMBLE_SIZE)
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                return AVERROR(EIO);
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            chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
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                codebook_size;
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            /* rewind */
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            url_fseek(pb, codebook_offset, SEEK_SET);
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            /* load up the packet */
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            ret= av_get_packet(pb, pkt, chunk_size);
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            if (ret != chunk_size)
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                return AVERROR(EIO);
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            pkt->stream_index = roq->video_stream_index;
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            pkt->pts = roq->video_pts++;
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            packet_read = 1;
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            break;
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        case RoQ_SOUND_MONO:
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        case RoQ_SOUND_STEREO:
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            if (roq->audio_stream_index == -1) {
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                AVStream *st = av_new_stream(s, 1);
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                if (!st)
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                    return AVERROR(ENOMEM);
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                av_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
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                roq->audio_stream_index = st->index;
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                st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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                st->codec->codec_id = CODEC_ID_ROQ_DPCM;
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                st->codec->codec_tag = 0;  /* no tag */
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                st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
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                st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
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                st->codec->bits_per_coded_sample = 16;
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                st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
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                    st->codec->bits_per_coded_sample;
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                st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
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            }
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        case RoQ_QUAD_VQ:
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            /* load up the packet */
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            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
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                return AVERROR(EIO);
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            /* copy over preamble */
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            memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
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            if (chunk_type == RoQ_QUAD_VQ) {
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                pkt->stream_index = roq->video_stream_index;
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                pkt->pts = roq->video_pts++;
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            } else {
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                pkt->stream_index = roq->audio_stream_index;
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                pkt->pts = roq->audio_frame_count;
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                roq->audio_frame_count += (chunk_size / roq->audio_channels);
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            }
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            pkt->pos= url_ftell(pb);
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            ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
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                chunk_size);
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            if (ret != chunk_size)
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                ret = AVERROR(EIO);
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            packet_read = 1;
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            break;
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        default:
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            av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
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            return AVERROR_INVALIDDATA;
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            break;
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        }
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    }
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    return ret;
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}
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AVInputFormat ff_roq_demuxer = {
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    "RoQ",
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    NULL_IF_CONFIG_SMALL("id RoQ format"),
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    sizeof(RoqDemuxContext),
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    roq_probe,
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    roq_read_header,
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    roq_read_packet,
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};