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00035 #include "libavutil/intreadwrite.h"
00036 #include "libavutil/mathematics.h"
00037 #include "avformat.h"
00038 #include "internal.h"
00039
00040 #define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr, palette
00041
00042 #define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
00043 #define RLV2_TAG MKBETAG('R', 'L', 'V', '2')
00044 #define RLV3_TAG MKBETAG('R', 'L', 'V', '3')
00045
00046 typedef struct Rl2DemuxContext {
00047 unsigned int index_pos[2];
00048 } Rl2DemuxContext;
00049
00050
00056 static int rl2_probe(AVProbeData *p)
00057 {
00058
00059 if(AV_RB32(&p->buf[0]) != FORM_TAG)
00060 return 0;
00061
00062 if(AV_RB32(&p->buf[8]) != RLV2_TAG &&
00063 AV_RB32(&p->buf[8]) != RLV3_TAG)
00064 return 0;
00065
00066 return AVPROBE_SCORE_MAX;
00067 }
00068
00075 static av_cold int rl2_read_header(AVFormatContext *s,
00076 AVFormatParameters *ap)
00077 {
00078 AVIOContext *pb = s->pb;
00079 AVStream *st;
00080 unsigned int frame_count;
00081 unsigned int audio_frame_counter = 0;
00082 unsigned int video_frame_counter = 0;
00083 unsigned int back_size;
00084 unsigned short sound_rate;
00085 unsigned short rate;
00086 unsigned short channels;
00087 unsigned short def_sound_size;
00088 unsigned int signature;
00089 unsigned int pts_den = 11025;
00090 unsigned int pts_num = 1103;
00091 unsigned int* chunk_offset = NULL;
00092 int* chunk_size = NULL;
00093 int* audio_size = NULL;
00094 int i;
00095 int ret = 0;
00096
00097 avio_skip(pb,4);
00098 back_size = avio_rl32(pb);
00099 signature = avio_rb32(pb);
00100 avio_skip(pb, 4);
00101 frame_count = avio_rl32(pb);
00102
00103
00104 if(back_size > INT_MAX/2 || frame_count > INT_MAX / sizeof(uint32_t))
00105 return AVERROR_INVALIDDATA;
00106
00107 avio_skip(pb, 2);
00108 sound_rate = avio_rl16(pb);
00109 rate = avio_rl16(pb);
00110 channels = avio_rl16(pb);
00111 def_sound_size = avio_rl16(pb);
00112
00114 st = avformat_new_stream(s, NULL);
00115 if(!st)
00116 return AVERROR(ENOMEM);
00117
00118 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00119 st->codec->codec_id = CODEC_ID_RL2;
00120 st->codec->codec_tag = 0;
00121 st->codec->width = 320;
00122 st->codec->height = 200;
00123
00125 st->codec->extradata_size = EXTRADATA1_SIZE;
00126
00127 if(signature == RLV3_TAG && back_size > 0)
00128 st->codec->extradata_size += back_size;
00129
00130 st->codec->extradata = av_mallocz(st->codec->extradata_size +
00131 FF_INPUT_BUFFER_PADDING_SIZE);
00132 if(!st->codec->extradata)
00133 return AVERROR(ENOMEM);
00134
00135 if(avio_read(pb,st->codec->extradata,st->codec->extradata_size) !=
00136 st->codec->extradata_size)
00137 return AVERROR(EIO);
00138
00140 if(sound_rate){
00141 pts_num = def_sound_size;
00142 pts_den = rate;
00143
00144 st = avformat_new_stream(s, NULL);
00145 if (!st)
00146 return AVERROR(ENOMEM);
00147 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00148 st->codec->codec_id = CODEC_ID_PCM_U8;
00149 st->codec->codec_tag = 1;
00150 st->codec->channels = channels;
00151 st->codec->bits_per_coded_sample = 8;
00152 st->codec->sample_rate = rate;
00153 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00154 st->codec->bits_per_coded_sample;
00155 st->codec->block_align = st->codec->channels *
00156 st->codec->bits_per_coded_sample / 8;
00157 avpriv_set_pts_info(st,32,1,rate);
00158 }
00159
00160 avpriv_set_pts_info(s->streams[0], 32, pts_num, pts_den);
00161
00162 chunk_size = av_malloc(frame_count * sizeof(uint32_t));
00163 audio_size = av_malloc(frame_count * sizeof(uint32_t));
00164 chunk_offset = av_malloc(frame_count * sizeof(uint32_t));
00165
00166 if(!chunk_size || !audio_size || !chunk_offset){
00167 av_free(chunk_size);
00168 av_free(audio_size);
00169 av_free(chunk_offset);
00170 return AVERROR(ENOMEM);
00171 }
00172
00174 for(i=0; i < frame_count;i++)
00175 chunk_size[i] = avio_rl32(pb);
00176 for(i=0; i < frame_count;i++)
00177 chunk_offset[i] = avio_rl32(pb);
00178 for(i=0; i < frame_count;i++)
00179 audio_size[i] = avio_rl32(pb) & 0xFFFF;
00180
00182 for(i=0;i<frame_count;i++){
00183 if(chunk_size[i] < 0 || audio_size[i] > chunk_size[i]){
00184 ret = AVERROR_INVALIDDATA;
00185 break;
00186 }
00187
00188 if(sound_rate && audio_size[i]){
00189 av_add_index_entry(s->streams[1], chunk_offset[i],
00190 audio_frame_counter,audio_size[i], 0, AVINDEX_KEYFRAME);
00191 audio_frame_counter += audio_size[i] / channels;
00192 }
00193 av_add_index_entry(s->streams[0], chunk_offset[i] + audio_size[i],
00194 video_frame_counter,chunk_size[i]-audio_size[i],0,AVINDEX_KEYFRAME);
00195 ++video_frame_counter;
00196 }
00197
00198
00199 av_free(chunk_size);
00200 av_free(audio_size);
00201 av_free(chunk_offset);
00202
00203 return ret;
00204 }
00205
00212 static int rl2_read_packet(AVFormatContext *s,
00213 AVPacket *pkt)
00214 {
00215 Rl2DemuxContext *rl2 = s->priv_data;
00216 AVIOContext *pb = s->pb;
00217 AVIndexEntry *sample = NULL;
00218 int i;
00219 int ret = 0;
00220 int stream_id = -1;
00221 int64_t pos = INT64_MAX;
00222
00224 for(i=0; i<s->nb_streams; i++){
00225 if(rl2->index_pos[i] < s->streams[i]->nb_index_entries
00226 && s->streams[i]->index_entries[ rl2->index_pos[i] ].pos < pos){
00227 sample = &s->streams[i]->index_entries[ rl2->index_pos[i] ];
00228 pos= sample->pos;
00229 stream_id= i;
00230 }
00231 }
00232
00233 if(stream_id == -1)
00234 return AVERROR(EIO);
00235
00236 ++rl2->index_pos[stream_id];
00237
00239 avio_seek(pb, sample->pos, SEEK_SET);
00240
00242 ret = av_get_packet(pb, pkt, sample->size);
00243 if(ret != sample->size){
00244 av_free_packet(pkt);
00245 return AVERROR(EIO);
00246 }
00247
00248 pkt->stream_index = stream_id;
00249 pkt->pts = sample->timestamp;
00250
00251 return ret;
00252 }
00253
00262 static int rl2_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00263 {
00264 AVStream *st = s->streams[stream_index];
00265 Rl2DemuxContext *rl2 = s->priv_data;
00266 int i;
00267 int index = av_index_search_timestamp(st, timestamp, flags);
00268 if(index < 0)
00269 return -1;
00270
00271 rl2->index_pos[stream_index] = index;
00272 timestamp = st->index_entries[index].timestamp;
00273
00274 for(i=0; i < s->nb_streams; i++){
00275 AVStream *st2 = s->streams[i];
00276 index = av_index_search_timestamp(st2,
00277 av_rescale_q(timestamp, st->time_base, st2->time_base),
00278 flags | AVSEEK_FLAG_BACKWARD);
00279
00280 if(index < 0)
00281 index = 0;
00282
00283 rl2->index_pos[i] = index;
00284 }
00285
00286 return 0;
00287 }
00288
00289 AVInputFormat ff_rl2_demuxer = {
00290 .name = "rl2",
00291 .long_name = NULL_IF_CONFIG_SMALL("RL2 format"),
00292 .priv_data_size = sizeof(Rl2DemuxContext),
00293 .read_probe = rl2_probe,
00294 .read_header = rl2_read_header,
00295 .read_packet = rl2_read_packet,
00296 .read_seek = rl2_read_seek,
00297 };
00298