yading@11: /*
yading@11:  * id RoQ (.roq) File Demuxer
yading@11:  * Copyright (c) 2003 The ffmpeg Project
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * id RoQ format file demuxer
yading@11:  * by Mike Melanson (melanson@pcisys.net)
yading@11:  * for more information on the .roq file format, visit:
yading@11:  *   http://www.csse.monash.edu.au/~timf/
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "avio_internal.h"
yading@11: 
yading@11: #define RoQ_MAGIC_NUMBER 0x1084
yading@11: #define RoQ_CHUNK_PREAMBLE_SIZE 8
yading@11: #define RoQ_AUDIO_SAMPLE_RATE 22050
yading@11: #define RoQ_CHUNKS_TO_SCAN 30
yading@11: 
yading@11: #define RoQ_INFO           0x1001
yading@11: #define RoQ_QUAD_CODEBOOK  0x1002
yading@11: #define RoQ_QUAD_VQ        0x1011
yading@11: #define RoQ_SOUND_MONO     0x1020
yading@11: #define RoQ_SOUND_STEREO   0x1021
yading@11: 
yading@11: typedef struct RoqDemuxContext {
yading@11: 
yading@11:     int frame_rate;
yading@11:     int width;
yading@11:     int height;
yading@11:     int audio_channels;
yading@11: 
yading@11:     int video_stream_index;
yading@11:     int audio_stream_index;
yading@11: 
yading@11:     int64_t video_pts;
yading@11:     unsigned int audio_frame_count;
yading@11: 
yading@11: } RoqDemuxContext;
yading@11: 
yading@11: static int roq_probe(AVProbeData *p)
yading@11: {
yading@11:     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
yading@11:         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
yading@11:         return 0;
yading@11: 
yading@11:     return AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: static int roq_read_header(AVFormatContext *s)
yading@11: {
yading@11:     RoqDemuxContext *roq = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
yading@11: 
yading@11:     /* get the main header */
yading@11:     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
yading@11:         RoQ_CHUNK_PREAMBLE_SIZE)
yading@11:         return AVERROR(EIO);
yading@11:     roq->frame_rate = AV_RL16(&preamble[6]);
yading@11: 
yading@11:     /* init private context parameters */
yading@11:     roq->width = roq->height = roq->audio_channels = roq->video_pts =
yading@11:     roq->audio_frame_count = 0;
yading@11:     roq->audio_stream_index = -1;
yading@11:     roq->video_stream_index = -1;
yading@11: 
yading@11:     s->ctx_flags |= AVFMTCTX_NOHEADER;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int roq_read_packet(AVFormatContext *s,
yading@11:                            AVPacket *pkt)
yading@11: {
yading@11:     RoqDemuxContext *roq = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int ret = 0;
yading@11:     unsigned int chunk_size;
yading@11:     unsigned int chunk_type;
yading@11:     unsigned int codebook_size;
yading@11:     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
yading@11:     int packet_read = 0;
yading@11:     int64_t codebook_offset;
yading@11: 
yading@11:     while (!packet_read) {
yading@11: 
yading@11:         if (url_feof(s->pb))
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         /* get the next chunk preamble */
yading@11:         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
yading@11:             RoQ_CHUNK_PREAMBLE_SIZE)
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         chunk_type = AV_RL16(&preamble[0]);
yading@11:         chunk_size = AV_RL32(&preamble[2]);
yading@11:         if(chunk_size > INT_MAX)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         chunk_size = ffio_limit(pb, chunk_size);
yading@11: 
yading@11:         switch (chunk_type) {
yading@11: 
yading@11:         case RoQ_INFO:
yading@11:             if (roq->video_stream_index == -1) {
yading@11:                 AVStream *st = avformat_new_stream(s, NULL);
yading@11:                 if (!st)
yading@11:                     return AVERROR(ENOMEM);
yading@11:                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
yading@11:                 roq->video_stream_index = st->index;
yading@11:                 st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
yading@11:                 st->codec->codec_id     = AV_CODEC_ID_ROQ;
yading@11:                 st->codec->codec_tag    = 0;  /* no fourcc */
yading@11: 
yading@11:                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
yading@11:                     return AVERROR(EIO);
yading@11:                 st->codec->width  = roq->width  = AV_RL16(preamble);
yading@11:                 st->codec->height = roq->height = AV_RL16(preamble + 2);
yading@11:                 break;
yading@11:             }
yading@11:             /* don't care about this chunk anymore */
yading@11:             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
yading@11:             break;
yading@11: 
yading@11:         case RoQ_QUAD_CODEBOOK:
yading@11:             /* packet needs to contain both this codebook and next VQ chunk */
yading@11:             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
yading@11:             codebook_size = chunk_size;
yading@11:             avio_skip(pb, codebook_size);
yading@11:             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
yading@11:                 RoQ_CHUNK_PREAMBLE_SIZE)
yading@11:                 return AVERROR(EIO);
yading@11:             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
yading@11:                 codebook_size;
yading@11: 
yading@11:             /* rewind */
yading@11:             avio_seek(pb, codebook_offset, SEEK_SET);
yading@11: 
yading@11:             /* load up the packet */
yading@11:             ret= av_get_packet(pb, pkt, chunk_size);
yading@11:             if (ret != chunk_size)
yading@11:                 return AVERROR(EIO);
yading@11:             pkt->stream_index = roq->video_stream_index;
yading@11:             pkt->pts = roq->video_pts++;
yading@11: 
yading@11:             packet_read = 1;
yading@11:             break;
yading@11: 
yading@11:         case RoQ_SOUND_MONO:
yading@11:         case RoQ_SOUND_STEREO:
yading@11:             if (roq->audio_stream_index == -1) {
yading@11:                 AVStream *st = avformat_new_stream(s, NULL);
yading@11:                 if (!st)
yading@11:                     return AVERROR(ENOMEM);
yading@11:                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
yading@11:                 roq->audio_stream_index = st->index;
yading@11:                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:                 st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
yading@11:                 st->codec->codec_tag = 0;  /* no tag */
yading@11:                 if (chunk_type == RoQ_SOUND_STEREO) {
yading@11:                     st->codec->channels       = 2;
yading@11:                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:                 } else {
yading@11:                     st->codec->channels       = 1;
yading@11:                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:                 }
yading@11:                 roq->audio_channels    = st->codec->channels;
yading@11:                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
yading@11:                 st->codec->bits_per_coded_sample = 16;
yading@11:                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
yading@11:                     st->codec->bits_per_coded_sample;
yading@11:                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
yading@11:             }
yading@11:         case RoQ_QUAD_VQ:
yading@11:             /* load up the packet */
yading@11:             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
yading@11:                 return AVERROR(EIO);
yading@11:             /* copy over preamble */
yading@11:             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
yading@11: 
yading@11:             if (chunk_type == RoQ_QUAD_VQ) {
yading@11:                 pkt->stream_index = roq->video_stream_index;
yading@11:                 pkt->pts = roq->video_pts++;
yading@11:             } else {
yading@11:                 pkt->stream_index = roq->audio_stream_index;
yading@11:                 pkt->pts = roq->audio_frame_count;
yading@11:                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
yading@11:             }
yading@11: 
yading@11:             pkt->pos= avio_tell(pb);
yading@11:             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
yading@11:                 chunk_size);
yading@11:             if (ret != chunk_size)
yading@11:                 ret = AVERROR(EIO);
yading@11: 
yading@11:             packet_read = 1;
yading@11:             break;
yading@11: 
yading@11:         default:
yading@11:             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_roq_demuxer = {
yading@11:     .name           = "roq",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ"),
yading@11:     .priv_data_size = sizeof(RoqDemuxContext),
yading@11:     .read_probe     = roq_probe,
yading@11:     .read_header    = roq_read_header,
yading@11:     .read_packet    = roq_read_packet,
yading@11: };