/* * Id RoQ (.roq) File Demuxer * Copyright (c) 2003 The ffmpeg Project * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *//** * @file idroq.c * Id RoQ format file demuxer * by Mike Melanson (melanson@pcisys.net) * for more information on the .roq file format, visit: *   http://www.csse.monash.edu.au/~timf/ */#include "avformat.h"#define RoQ_MAGIC_NUMBER 0x1084#define RoQ_CHUNK_PREAMBLE_SIZE 8#define RoQ_AUDIO_SAMPLE_RATE 22050#define RoQ_CHUNKS_TO_SCAN 30#define RoQ_INFO           0x1001#define RoQ_QUAD_CODEBOOK  0x1002#define RoQ_QUAD_VQ        0x1011#define RoQ_SOUND_MONO     0x1020#define RoQ_SOUND_STEREO   0x1021typedef struct RoqDemuxContext {    int width;    int height;    int audio_channels;    int framerate;    int frame_pts_inc;    int video_stream_index;    int audio_stream_index;    int64_t video_pts;    unsigned int audio_frame_count;} RoqDemuxContext;static int roq_probe(AVProbeData *p){    if (p->buf_size < 6)        return 0;    if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||        (LE_32(&p->buf[2]) != 0xFFFFFFFF))        return 0;    return AVPROBE_SCORE_MAX;}static int roq_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    RoqDemuxContext *roq = s->priv_data;    ByteIOContext *pb = &s->pb;    AVStream *st;    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];    int i;    unsigned int chunk_size;    unsigned int chunk_type;    /* get the main header */    if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=         RoQ_CHUNK_PREAMBLE_SIZE)        return AVERROR_IO;    roq->framerate = LE_16(&preamble[6]);    roq->frame_pts_inc = 90000 / roq->framerate;    /* set the pts reference (1 pts = 1/90000) */    s->pts_num = 1;    s->pts_den = 90000;    /* init private context parameters */    roq->width = roq->height = roq->audio_channels = roq->video_pts =     roq->audio_frame_count = 0;    /* scan the first n chunks searching for A/V parameters */    for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {        if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=             RoQ_CHUNK_PREAMBLE_SIZE)            return AVERROR_IO;        chunk_type = LE_16(&preamble[0]);        chunk_size = LE_32(&preamble[2]);        switch (chunk_type) {        case RoQ_INFO:            /* fetch the width and height; reuse the preamble bytes */            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=                 RoQ_CHUNK_PREAMBLE_SIZE)                return AVERROR_IO;            roq->width = LE_16(&preamble[0]);            roq->height = LE_16(&preamble[2]);            break;        case RoQ_QUAD_CODEBOOK:        case RoQ_QUAD_VQ:            /* ignore during this scan */            url_fseek(pb, chunk_size, SEEK_CUR);            break;        case RoQ_SOUND_MONO:            roq->audio_channels = 1;            url_fseek(pb, chunk_size, SEEK_CUR);            break;        case RoQ_SOUND_STEREO:            roq->audio_channels = 2;            url_fseek(pb, chunk_size, SEEK_CUR);            break;        default:            av_log(s, AV_LOG_ERROR, " unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0]));            return AVERROR_INVALIDDATA;            break;        }        /* if all necessary parameters have been gathered, exit early */        if ((roq->width && roq->height) && roq->audio_channels)            break;    }    /* seek back to the first chunk */    url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);    /* initialize the decoders */    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    roq->video_stream_index = st->index;    st->codec.codec_type = CODEC_TYPE_VIDEO;    st->codec.codec_id = CODEC_ID_ROQ;    st->codec.codec_tag = 0;  /* no fourcc */    st->codec.width = roq->width;    st->codec.height = roq->height;    if (roq->audio_channels) {        st = av_new_stream(s, 0);        if (!st)            return AVERROR_NOMEM;        roq->audio_stream_index = st->index;        st->codec.codec_type = CODEC_TYPE_AUDIO;        st->codec.codec_id = CODEC_ID_ROQ_DPCM;        st->codec.codec_tag = 0;  /* no tag */        st->codec.channels = roq->audio_channels;        st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE;        st->codec.bits_per_sample = 16;        st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *            st->codec.bits_per_sample;        st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;    }    return 0;}static int roq_read_packet(AVFormatContext *s,                           AVPacket *pkt){    RoqDemuxContext *roq = s->priv_data;    ByteIOContext *pb = &s->pb;    int ret = 0;    unsigned int chunk_size;    unsigned int chunk_type;    unsigned int codebook_size;    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];    int packet_read = 0;    offset_t codebook_offset;    while (!packet_read) {        if (url_feof(&s->pb))            return -EIO;        /* get the next chunk preamble */        if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=             RoQ_CHUNK_PREAMBLE_SIZE)            return -EIO;        chunk_type = LE_16(&preamble[0]);        chunk_size = LE_32(&preamble[2]);        switch (chunk_type) {        case RoQ_INFO:            /* don't care about this chunk anymore */            url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);            break;        case RoQ_QUAD_CODEBOOK:            /* packet needs to contain both this codebook and next VQ chunk */            codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;            codebook_size = chunk_size;            url_fseek(pb, codebook_size, SEEK_CUR);            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=                 RoQ_CHUNK_PREAMBLE_SIZE)                return -EIO;            chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +                 codebook_size;            /* rewind */            url_fseek(pb, codebook_offset, SEEK_SET);            /* load up the packet */            if (av_new_packet(pkt, chunk_size))                return -EIO;            pkt->stream_index = roq->video_stream_index;            pkt->pts = roq->video_pts;            ret = get_buffer(pb, pkt->data, chunk_size);            if (ret != chunk_size)                ret = -EIO;            roq->video_pts += roq->frame_pts_inc;            packet_read = 1;            break;        case RoQ_SOUND_MONO:        case RoQ_SOUND_STEREO:        case RoQ_QUAD_VQ:            /* load up the packet */            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))                return -EIO;            /* copy over preamble */            memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);            if (chunk_type == RoQ_QUAD_VQ) {                pkt->stream_index = roq->video_stream_index;                pkt->pts = roq->video_pts;                roq->video_pts += roq->frame_pts_inc;            } else {                pkt->stream_index = roq->audio_stream_index;                pkt->pts = roq->audio_frame_count;                pkt->pts *= 90000;                pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;                roq->audio_frame_count += (chunk_size / roq->audio_channels);            }            ret = get_buffer(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,                chunk_size);            if (ret != chunk_size)                ret = -EIO;            packet_read = 1;            break;        default:            av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);            return AVERROR_INVALIDDATA;            break;        }    }    return ret;}static int roq_read_close(AVFormatContext *s){//    RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data;    return 0;}static AVInputFormat roq_iformat = {    "RoQ",    "Id RoQ format",    sizeof(RoqDemuxContext),    roq_probe,    roq_read_header,    roq_read_packet,    roq_read_close,};int roq_init(void){    av_register_input_format(&roq_iformat);    return 0;}