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00030 #include "libavutil/intreadwrite.h"
00031 #include "avformat.h"
00032 #include "internal.h"
00033
00034 #define RoQ_MAGIC_NUMBER 0x1084
00035 #define RoQ_CHUNK_PREAMBLE_SIZE 8
00036 #define RoQ_AUDIO_SAMPLE_RATE 22050
00037 #define RoQ_CHUNKS_TO_SCAN 30
00038
00039 #define RoQ_INFO 0x1001
00040 #define RoQ_QUAD_CODEBOOK 0x1002
00041 #define RoQ_QUAD_VQ 0x1011
00042 #define RoQ_SOUND_MONO 0x1020
00043 #define RoQ_SOUND_STEREO 0x1021
00044
00045 typedef struct RoqDemuxContext {
00046
00047 int frame_rate;
00048 int width;
00049 int height;
00050 int audio_channels;
00051
00052 int video_stream_index;
00053 int audio_stream_index;
00054
00055 int64_t video_pts;
00056 unsigned int audio_frame_count;
00057
00058 } RoqDemuxContext;
00059
00060 static int roq_probe(AVProbeData *p)
00061 {
00062 if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
00063 (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
00064 return 0;
00065
00066 return AVPROBE_SCORE_MAX;
00067 }
00068
00069 static int roq_read_header(AVFormatContext *s,
00070 AVFormatParameters *ap)
00071 {
00072 RoqDemuxContext *roq = s->priv_data;
00073 AVIOContext *pb = s->pb;
00074 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
00075
00076
00077 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
00078 RoQ_CHUNK_PREAMBLE_SIZE)
00079 return AVERROR(EIO);
00080 roq->frame_rate = AV_RL16(&preamble[6]);
00081
00082
00083 roq->width = roq->height = roq->audio_channels = roq->video_pts =
00084 roq->audio_frame_count = 0;
00085 roq->audio_stream_index = -1;
00086 roq->video_stream_index = -1;
00087
00088 s->ctx_flags |= AVFMTCTX_NOHEADER;
00089
00090 return 0;
00091 }
00092
00093 static int roq_read_packet(AVFormatContext *s,
00094 AVPacket *pkt)
00095 {
00096 RoqDemuxContext *roq = s->priv_data;
00097 AVIOContext *pb = s->pb;
00098 int ret = 0;
00099 unsigned int chunk_size;
00100 unsigned int chunk_type;
00101 unsigned int codebook_size;
00102 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
00103 int packet_read = 0;
00104 int64_t codebook_offset;
00105
00106 while (!packet_read) {
00107
00108 if (s->pb->eof_reached)
00109 return AVERROR(EIO);
00110
00111
00112 if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
00113 RoQ_CHUNK_PREAMBLE_SIZE)
00114 return AVERROR(EIO);
00115
00116 chunk_type = AV_RL16(&preamble[0]);
00117 chunk_size = AV_RL32(&preamble[2]);
00118 if(chunk_size > INT_MAX)
00119 return AVERROR_INVALIDDATA;
00120
00121 switch (chunk_type) {
00122
00123 case RoQ_INFO:
00124 if (roq->video_stream_index == -1) {
00125 AVStream *st = avformat_new_stream(s, NULL);
00126 if (!st)
00127 return AVERROR(ENOMEM);
00128 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
00129 roq->video_stream_index = st->index;
00130 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00131 st->codec->codec_id = CODEC_ID_ROQ;
00132 st->codec->codec_tag = 0;
00133
00134 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
00135 return AVERROR(EIO);
00136 st->codec->width = roq->width = AV_RL16(preamble);
00137 st->codec->height = roq->height = AV_RL16(preamble + 2);
00138 break;
00139 }
00140
00141 avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
00142 break;
00143
00144 case RoQ_QUAD_CODEBOOK:
00145
00146 codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
00147 codebook_size = chunk_size;
00148 avio_skip(pb, codebook_size);
00149 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
00150 RoQ_CHUNK_PREAMBLE_SIZE)
00151 return AVERROR(EIO);
00152 chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
00153 codebook_size;
00154
00155
00156 avio_seek(pb, codebook_offset, SEEK_SET);
00157
00158
00159 ret= av_get_packet(pb, pkt, chunk_size);
00160 if (ret != chunk_size)
00161 return AVERROR(EIO);
00162 pkt->stream_index = roq->video_stream_index;
00163 pkt->pts = roq->video_pts++;
00164
00165 packet_read = 1;
00166 break;
00167
00168 case RoQ_SOUND_MONO:
00169 case RoQ_SOUND_STEREO:
00170 if (roq->audio_stream_index == -1) {
00171 AVStream *st = avformat_new_stream(s, NULL);
00172 if (!st)
00173 return AVERROR(ENOMEM);
00174 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
00175 roq->audio_stream_index = st->index;
00176 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00177 st->codec->codec_id = CODEC_ID_ROQ_DPCM;
00178 st->codec->codec_tag = 0;
00179 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
00180 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
00181 st->codec->bits_per_coded_sample = 16;
00182 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00183 st->codec->bits_per_coded_sample;
00184 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
00185 }
00186 case RoQ_QUAD_VQ:
00187
00188 if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
00189 return AVERROR(EIO);
00190
00191 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
00192
00193 if (chunk_type == RoQ_QUAD_VQ) {
00194 pkt->stream_index = roq->video_stream_index;
00195 pkt->pts = roq->video_pts++;
00196 } else {
00197 pkt->stream_index = roq->audio_stream_index;
00198 pkt->pts = roq->audio_frame_count;
00199 roq->audio_frame_count += (chunk_size / roq->audio_channels);
00200 }
00201
00202 pkt->pos= avio_tell(pb);
00203 ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
00204 chunk_size);
00205 if (ret != chunk_size)
00206 ret = AVERROR(EIO);
00207
00208 packet_read = 1;
00209 break;
00210
00211 default:
00212 av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
00213 return AVERROR_INVALIDDATA;
00214 }
00215 }
00216
00217 return ret;
00218 }
00219
00220 AVInputFormat ff_roq_demuxer = {
00221 .name = "RoQ",
00222 .long_name = NULL_IF_CONFIG_SMALL("id RoQ format"),
00223 .priv_data_size = sizeof(RoqDemuxContext),
00224 .read_probe = roq_probe,
00225 .read_header = roq_read_header,
00226 .read_packet = roq_read_packet,
00227 };