/*

  * id RoQ (.roq) File Demuxer

  * Copyright (c) 2003 The FFmpeg project

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg 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 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg 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 FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */
 
 /**

  * @file

  * 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 "libavutil/channel_layout.h"

 #include "libavutil/intreadwrite.h"

 #include "avformat.h"

 #include "internal.h"

 #include "avio_internal.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   0x1021
 
 typedef struct RoqDemuxContext {
 

     int frame_rate;

     int width;
     int height;
     int audio_channels;
 
     int video_stream_index;
     int audio_stream_index;
 
     int64_t video_pts;
     unsigned int audio_frame_count;
 
 } RoqDemuxContext;
 

 static int roq_probe(const AVProbeData *p)

 {

     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))

         return 0;
 
     return AVPROBE_SCORE_MAX;
 }
 

 static int roq_read_header(AVFormatContext *s)

 {
     RoqDemuxContext *roq = s->priv_data;

     AVIOContext *pb = s->pb;

     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
 
     /* get the main header */

     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=

         RoQ_CHUNK_PREAMBLE_SIZE)

         return AVERROR(EIO);

     roq->frame_rate = AV_RL16(&preamble[6]);

 
     /* init private context parameters */

     roq->width = roq->height = roq->audio_channels = roq->video_pts =

     roq->audio_frame_count = 0;

     roq->audio_stream_index = -1;

     roq->video_stream_index = -1;

     s->ctx_flags |= AVFMTCTX_NOHEADER;

 
     return 0;
 }
 
 static int roq_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     RoqDemuxContext *roq = s->priv_data;

     AVIOContext *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;

     int64_t codebook_offset;

 
     while (!packet_read) {
 

         if (avio_feof(s->pb))

             return AVERROR(EIO);

 
         /* get the next chunk preamble */

         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=

             RoQ_CHUNK_PREAMBLE_SIZE)

             return AVERROR(EIO);

         chunk_type = AV_RL16(&preamble[0]);
         chunk_size = AV_RL32(&preamble[2]);

         if(chunk_size > INT_MAX)
             return AVERROR_INVALIDDATA;

         chunk_size = ffio_limit(pb, chunk_size);
 

         switch (chunk_type) {
 
         case RoQ_INFO:

             if (roq->video_stream_index == -1) {
                 AVStream *st = avformat_new_stream(s, NULL);
                 if (!st)
                     return AVERROR(ENOMEM);
                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
                 roq->video_stream_index = st->index;

                 st->codecpar->codec_type   = AVMEDIA_TYPE_VIDEO;
                 st->codecpar->codec_id     = AV_CODEC_ID_ROQ;
                 st->codecpar->codec_tag    = 0;  /* no fourcc */

                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)

                     return AVERROR(EIO);

                 st->codecpar->width  = roq->width  = AV_RL16(preamble);
                 st->codecpar->height = roq->height = AV_RL16(preamble + 2);

                 break;
             }

             /* don't care about this chunk anymore */

             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);

             break;
 
         case RoQ_QUAD_CODEBOOK:

             if (roq->video_stream_index < 0)
                 return AVERROR_INVALIDDATA;

             /* packet needs to contain both this codebook and next VQ chunk */

             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;

             codebook_size = chunk_size;

             avio_skip(pb, codebook_size);

             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=

                 RoQ_CHUNK_PREAMBLE_SIZE)

                 return AVERROR(EIO);

             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +

                 codebook_size;
 

             if (chunk_size > INT_MAX)
                 return AVERROR_INVALIDDATA;
 

             /* rewind */

             avio_seek(pb, codebook_offset, SEEK_SET);

 
             /* load up the packet */

             ret= av_get_packet(pb, pkt, chunk_size);
             if (ret != chunk_size)

                 return AVERROR(EIO);

             pkt->stream_index = roq->video_stream_index;

             pkt->pts = roq->video_pts++;

 
             packet_read = 1;
             break;
 
         case RoQ_SOUND_MONO:
         case RoQ_SOUND_STEREO:

             if (roq->audio_stream_index == -1) {

                 AVStream *st = avformat_new_stream(s, NULL);

                 if (!st)
                     return AVERROR(ENOMEM);

                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);

                 roq->audio_stream_index = st->index;

                 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
                 st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM;
                 st->codecpar->codec_tag = 0;  /* no tag */

                 if (chunk_type == RoQ_SOUND_STEREO) {

                     st->codecpar->channels       = 2;
                     st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;

                 } else {

                     st->codecpar->channels       = 1;
                     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

                 }

                 roq->audio_channels    = st->codecpar->channels;
                 st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
                 st->codecpar->bits_per_coded_sample = 16;
                 st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
                     st->codecpar->bits_per_coded_sample;
                 st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;

             }

         case RoQ_QUAD_VQ:

             if (chunk_type == RoQ_QUAD_VQ) {
                 if (roq->video_stream_index < 0)
                     return AVERROR_INVALIDDATA;
             }
 

             /* load up the packet */

             ret = av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE);
             if (ret < 0)
                 return ret;

             /* 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++;

             } else {
                 pkt->stream_index = roq->audio_stream_index;
                 pkt->pts = roq->audio_frame_count;
                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
             }
 

             pkt->pos= avio_tell(pb);

             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,

                 chunk_size);

             if (ret != chunk_size) {

                 return AVERROR(EIO);

             }

 
             packet_read = 1;
             break;
 
         default:

             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);

             return AVERROR_INVALIDDATA;
         }
     }
 
     return ret;
 }
 

 AVInputFormat ff_roq_demuxer = {

     .name           = "roq",

     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ"),

     .priv_data_size = sizeof(RoqDemuxContext),
     .read_probe     = roq_probe,
     .read_header    = roq_read_header,
     .read_packet    = roq_read_packet,

 };