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00030 #include "libavutil/intreadwrite.h"
00031 #include "libavutil/intfloat.h"
00032 #include "avformat.h"
00033 #include "internal.h"
00034
00035 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
00036 #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
00037 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
00038 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
00039 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
00040 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
00041 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
00042 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
00043 #define std__TAG MKTAG('s', 't', 'd', '_')
00044 #define name_TAG MKTAG('n', 'a', 'm', 'e')
00045 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
00046 #define strk_TAG MKTAG('s', 't', 'r', 'k')
00047 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
00048 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
00049 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
00050 #define ifr2_TAG MKTAG('i', 'f', 'r', '2')
00051 #define pfr2_TAG MKTAG('p', 'f', 'r', '2')
00052 #define cfr2_TAG MKTAG('c', 'f', 'r', '2')
00053 #define snd__TAG MKTAG('s', 'n', 'd', '_')
00054
00055 #define vtrk_SIZE 0x44
00056 #define strk_SIZE 0x28
00057
00058 #define GET_LIST_HEADER() \
00059 fourcc_tag = avio_rl32(pb); \
00060 size = avio_rl32(pb); \
00061 if (fourcc_tag != LIST_TAG) \
00062 return AVERROR_INVALIDDATA; \
00063 fourcc_tag = avio_rl32(pb);
00064
00065 typedef struct AudioTrack {
00066 int sample_rate;
00067 int bits;
00068 int channels;
00069 int stream_index;
00070 int adpcm;
00071 int64_t audio_pts;
00072 } AudioTrack;
00073
00074 typedef struct FourxmDemuxContext {
00075 int width;
00076 int height;
00077 int video_stream_index;
00078 int track_count;
00079 AudioTrack *tracks;
00080
00081 int64_t video_pts;
00082 float fps;
00083 } FourxmDemuxContext;
00084
00085 static int fourxm_probe(AVProbeData *p)
00086 {
00087 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
00088 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
00089 return 0;
00090
00091 return AVPROBE_SCORE_MAX;
00092 }
00093
00094 static int fourxm_read_header(AVFormatContext *s,
00095 AVFormatParameters *ap)
00096 {
00097 AVIOContext *pb = s->pb;
00098 unsigned int fourcc_tag;
00099 unsigned int size;
00100 int header_size;
00101 FourxmDemuxContext *fourxm = s->priv_data;
00102 unsigned char *header;
00103 int i, ret;
00104 AVStream *st;
00105
00106 fourxm->track_count = 0;
00107 fourxm->tracks = NULL;
00108 fourxm->fps = 1.0;
00109
00110
00111 avio_skip(pb, 12);
00112
00113
00114 GET_LIST_HEADER();
00115 header_size = size - 4;
00116 if (fourcc_tag != HEAD_TAG || header_size < 0)
00117 return AVERROR_INVALIDDATA;
00118
00119
00120 header = av_malloc(header_size);
00121 if (!header)
00122 return AVERROR(ENOMEM);
00123 if (avio_read(pb, header, header_size) != header_size){
00124 av_free(header);
00125 return AVERROR(EIO);
00126 }
00127
00128
00129 for (i = 0; i < header_size - 8; i++) {
00130 fourcc_tag = AV_RL32(&header[i]);
00131 size = AV_RL32(&header[i + 4]);
00132 if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
00133 av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
00134 return AVERROR_INVALIDDATA;
00135 }
00136
00137 if (fourcc_tag == std__TAG) {
00138 fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
00139 } else if (fourcc_tag == vtrk_TAG) {
00140
00141 if (size != vtrk_SIZE) {
00142 ret= AVERROR_INVALIDDATA;
00143 goto fail;
00144 }
00145 fourxm->width = AV_RL32(&header[i + 36]);
00146 fourxm->height = AV_RL32(&header[i + 40]);
00147
00148
00149 st = avformat_new_stream(s, NULL);
00150 if (!st){
00151 ret= AVERROR(ENOMEM);
00152 goto fail;
00153 }
00154 avpriv_set_pts_info(st, 60, 1, fourxm->fps);
00155
00156 fourxm->video_stream_index = st->index;
00157
00158 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00159 st->codec->codec_id = CODEC_ID_4XM;
00160 st->codec->extradata_size = 4;
00161 st->codec->extradata = av_malloc(4);
00162 AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
00163 st->codec->width = fourxm->width;
00164 st->codec->height = fourxm->height;
00165
00166 i += 8 + size;
00167 } else if (fourcc_tag == strk_TAG) {
00168 int current_track;
00169
00170 if (size != strk_SIZE) {
00171 ret= AVERROR_INVALIDDATA;
00172 goto fail;
00173 }
00174 current_track = AV_RL32(&header[i + 8]);
00175 if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
00176 av_log(s, AV_LOG_ERROR, "current_track too large\n");
00177 ret= -1;
00178 goto fail;
00179 }
00180 if (current_track + 1 > fourxm->track_count) {
00181 fourxm->tracks = av_realloc_f(fourxm->tracks,
00182 sizeof(AudioTrack),
00183 current_track + 1);
00184 if (!fourxm->tracks) {
00185 ret = AVERROR(ENOMEM);
00186 goto fail;
00187 }
00188 memset(&fourxm->tracks[fourxm->track_count], 0,
00189 sizeof(AudioTrack) * (current_track + 1 - fourxm->track_count));
00190 fourxm->track_count = current_track + 1;
00191 }
00192 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
00193 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
00194 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
00195 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
00196 fourxm->tracks[current_track].audio_pts = 0;
00197 if( fourxm->tracks[current_track].channels <= 0
00198 || fourxm->tracks[current_track].sample_rate <= 0
00199 || fourxm->tracks[current_track].bits < 0){
00200 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
00201 ret= -1;
00202 goto fail;
00203 }
00204 i += 8 + size;
00205
00206
00207 st = avformat_new_stream(s, NULL);
00208 if (!st){
00209 ret= AVERROR(ENOMEM);
00210 goto fail;
00211 }
00212
00213 st->id = current_track;
00214 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
00215
00216 fourxm->tracks[current_track].stream_index = st->index;
00217
00218 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00219 st->codec->codec_tag = 0;
00220 st->codec->channels = fourxm->tracks[current_track].channels;
00221 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
00222 st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
00223 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00224 st->codec->bits_per_coded_sample;
00225 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
00226 if (fourxm->tracks[current_track].adpcm){
00227 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
00228 }else if (st->codec->bits_per_coded_sample == 8){
00229 st->codec->codec_id = CODEC_ID_PCM_U8;
00230 }else
00231 st->codec->codec_id = CODEC_ID_PCM_S16LE;
00232 }
00233 }
00234
00235
00236 GET_LIST_HEADER();
00237 if (fourcc_tag != MOVI_TAG){
00238 ret= AVERROR_INVALIDDATA;
00239 goto fail;
00240 }
00241
00242 av_free(header);
00243
00244 fourxm->video_pts = -1;
00245
00246 return 0;
00247 fail:
00248 av_freep(&fourxm->tracks);
00249 av_free(header);
00250 return ret;
00251 }
00252
00253 static int fourxm_read_packet(AVFormatContext *s,
00254 AVPacket *pkt)
00255 {
00256 FourxmDemuxContext *fourxm = s->priv_data;
00257 AVIOContext *pb = s->pb;
00258 unsigned int fourcc_tag;
00259 unsigned int size;
00260 int ret = 0;
00261 unsigned int track_number;
00262 int packet_read = 0;
00263 unsigned char header[8];
00264 int audio_frame_count;
00265
00266 while (!packet_read) {
00267
00268 if ((ret = avio_read(s->pb, header, 8)) < 0)
00269 return ret;
00270 fourcc_tag = AV_RL32(&header[0]);
00271 size = AV_RL32(&header[4]);
00272 if (url_feof(pb))
00273 return AVERROR(EIO);
00274 switch (fourcc_tag) {
00275
00276 case LIST_TAG:
00277
00278 fourxm->video_pts ++;
00279
00280
00281 avio_rl32(pb);
00282 break;
00283
00284 case ifrm_TAG:
00285 case pfrm_TAG:
00286 case cfrm_TAG:
00287 case ifr2_TAG:
00288 case pfr2_TAG:
00289 case cfr2_TAG:
00290
00291
00292 if (size + 8 < size || av_new_packet(pkt, size + 8))
00293 return AVERROR(EIO);
00294 pkt->stream_index = fourxm->video_stream_index;
00295 pkt->pts = fourxm->video_pts;
00296 pkt->pos = avio_tell(s->pb);
00297 memcpy(pkt->data, header, 8);
00298 ret = avio_read(s->pb, &pkt->data[8], size);
00299
00300 if (ret < 0){
00301 av_free_packet(pkt);
00302 }else
00303 packet_read = 1;
00304 break;
00305
00306 case snd__TAG:
00307 track_number = avio_rl32(pb);
00308 avio_skip(pb, 4);
00309 size-=8;
00310
00311 if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels>0) {
00312 ret= av_get_packet(s->pb, pkt, size);
00313 if(ret<0)
00314 return AVERROR(EIO);
00315 pkt->stream_index =
00316 fourxm->tracks[track_number].stream_index;
00317 pkt->pts = fourxm->tracks[track_number].audio_pts;
00318 packet_read = 1;
00319
00320
00321 audio_frame_count = size;
00322 if (fourxm->tracks[track_number].adpcm)
00323 audio_frame_count -=
00324 2 * (fourxm->tracks[track_number].channels);
00325 audio_frame_count /=
00326 fourxm->tracks[track_number].channels;
00327 if (fourxm->tracks[track_number].adpcm){
00328 audio_frame_count *= 2;
00329 }else
00330 audio_frame_count /=
00331 (fourxm->tracks[track_number].bits / 8);
00332 fourxm->tracks[track_number].audio_pts += audio_frame_count;
00333
00334 } else {
00335 avio_skip(pb, size);
00336 }
00337 break;
00338
00339 default:
00340 avio_skip(pb, size);
00341 break;
00342 }
00343 }
00344 return ret;
00345 }
00346
00347 static int fourxm_read_close(AVFormatContext *s)
00348 {
00349 FourxmDemuxContext *fourxm = s->priv_data;
00350
00351 av_freep(&fourxm->tracks);
00352
00353 return 0;
00354 }
00355
00356 AVInputFormat ff_fourxm_demuxer = {
00357 .name = "4xm",
00358 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies format"),
00359 .priv_data_size = sizeof(FourxmDemuxContext),
00360 .read_probe = fourxm_probe,
00361 .read_header = fourxm_read_header,
00362 .read_packet = fourxm_read_packet,
00363 .read_close = fourxm_read_close,
00364 };