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00030 #include "libavutil/intreadwrite.h"
00031 #include "avformat.h"
00032
00033 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
00034 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
00035 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
00036 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
00037
00038 typedef struct {
00039 int stream;
00040 int64_t sample_offset;
00041 unsigned int sample_size;
00042 int64_t pts;
00043 int keyframe;
00044 } film_sample;
00045
00046 typedef struct FilmDemuxContext {
00047 int video_stream_index;
00048 int audio_stream_index;
00049
00050 enum CodecID audio_type;
00051 unsigned int audio_samplerate;
00052 unsigned int audio_bits;
00053 unsigned int audio_channels;
00054
00055 enum CodecID video_type;
00056 unsigned int sample_count;
00057 film_sample *sample_table;
00058 unsigned int current_sample;
00059
00060 unsigned int base_clock;
00061 unsigned int version;
00062
00063
00064 unsigned char *stereo_buffer;
00065 int stereo_buffer_size;
00066 } FilmDemuxContext;
00067
00068 static int film_probe(AVProbeData *p)
00069 {
00070 if (AV_RB32(&p->buf[0]) != FILM_TAG)
00071 return 0;
00072
00073 return AVPROBE_SCORE_MAX;
00074 }
00075
00076 static int film_read_header(AVFormatContext *s,
00077 AVFormatParameters *ap)
00078 {
00079 FilmDemuxContext *film = s->priv_data;
00080 ByteIOContext *pb = s->pb;
00081 AVStream *st;
00082 unsigned char scratch[256];
00083 int i;
00084 unsigned int data_offset;
00085 unsigned int audio_frame_counter;
00086
00087 film->sample_table = NULL;
00088 film->stereo_buffer = NULL;
00089 film->stereo_buffer_size = 0;
00090
00091
00092 if (get_buffer(pb, scratch, 16) != 16)
00093 return AVERROR(EIO);
00094 data_offset = AV_RB32(&scratch[4]);
00095 film->version = AV_RB32(&scratch[8]);
00096
00097
00098 if (film->version == 0) {
00099
00100 if (get_buffer(pb, scratch, 20) != 20)
00101 return AVERROR(EIO);
00102
00103 film->audio_type = CODEC_ID_PCM_S8;
00104 film->audio_samplerate = 22050;
00105 film->audio_channels = 1;
00106 film->audio_bits = 8;
00107 } else {
00108
00109 if (get_buffer(pb, scratch, 32) != 32)
00110 return AVERROR(EIO);
00111 film->audio_samplerate = AV_RB16(&scratch[24]);
00112 film->audio_channels = scratch[21];
00113 film->audio_bits = scratch[22];
00114 if (film->audio_bits == 8)
00115 film->audio_type = CODEC_ID_PCM_S8;
00116 else if (film->audio_bits == 16)
00117 film->audio_type = CODEC_ID_PCM_S16BE;
00118 else
00119 film->audio_type = CODEC_ID_NONE;
00120 }
00121
00122 if (AV_RB32(&scratch[0]) != FDSC_TAG)
00123 return AVERROR_INVALIDDATA;
00124
00125 if (AV_RB32(&scratch[8]) == CVID_TAG) {
00126 film->video_type = CODEC_ID_CINEPAK;
00127 } else
00128 film->video_type = CODEC_ID_NONE;
00129
00130
00131 if (film->video_type) {
00132 st = av_new_stream(s, 0);
00133 if (!st)
00134 return AVERROR(ENOMEM);
00135 film->video_stream_index = st->index;
00136 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00137 st->codec->codec_id = film->video_type;
00138 st->codec->codec_tag = 0;
00139 st->codec->width = AV_RB32(&scratch[16]);
00140 st->codec->height = AV_RB32(&scratch[12]);
00141 }
00142
00143 if (film->audio_type) {
00144 st = av_new_stream(s, 0);
00145 if (!st)
00146 return AVERROR(ENOMEM);
00147 film->audio_stream_index = st->index;
00148 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00149 st->codec->codec_id = film->audio_type;
00150 st->codec->codec_tag = 1;
00151 st->codec->channels = film->audio_channels;
00152 st->codec->bits_per_coded_sample = film->audio_bits;
00153 st->codec->sample_rate = film->audio_samplerate;
00154 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00155 st->codec->bits_per_coded_sample;
00156 st->codec->block_align = st->codec->channels *
00157 st->codec->bits_per_coded_sample / 8;
00158 }
00159
00160
00161 if (get_buffer(pb, scratch, 16) != 16)
00162 return AVERROR(EIO);
00163 if (AV_RB32(&scratch[0]) != STAB_TAG)
00164 return AVERROR_INVALIDDATA;
00165 film->base_clock = AV_RB32(&scratch[8]);
00166 film->sample_count = AV_RB32(&scratch[12]);
00167 if(film->sample_count >= UINT_MAX / sizeof(film_sample))
00168 return -1;
00169 film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));
00170
00171 for(i=0; i<s->nb_streams; i++)
00172 av_set_pts_info(s->streams[i], 33, 1, film->base_clock);
00173
00174 audio_frame_counter = 0;
00175 for (i = 0; i < film->sample_count; i++) {
00176
00177 if (get_buffer(pb, scratch, 16) != 16) {
00178 av_free(film->sample_table);
00179 return AVERROR(EIO);
00180 }
00181 film->sample_table[i].sample_offset =
00182 data_offset + AV_RB32(&scratch[0]);
00183 film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
00184 if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
00185 film->sample_table[i].stream = film->audio_stream_index;
00186 film->sample_table[i].pts = audio_frame_counter;
00187 film->sample_table[i].pts *= film->base_clock;
00188 film->sample_table[i].pts /= film->audio_samplerate;
00189
00190 audio_frame_counter += (film->sample_table[i].sample_size /
00191 (film->audio_channels * film->audio_bits / 8));
00192 } else {
00193 film->sample_table[i].stream = film->video_stream_index;
00194 film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
00195 film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
00196 }
00197 }
00198
00199 film->current_sample = 0;
00200
00201 return 0;
00202 }
00203
00204 static int film_read_packet(AVFormatContext *s,
00205 AVPacket *pkt)
00206 {
00207 FilmDemuxContext *film = s->priv_data;
00208 ByteIOContext *pb = s->pb;
00209 film_sample *sample;
00210 int ret = 0;
00211 int i;
00212 int left, right;
00213
00214 if (film->current_sample >= film->sample_count)
00215 return AVERROR(EIO);
00216
00217 sample = &film->sample_table[film->current_sample];
00218
00219
00220 url_fseek(pb, sample->sample_offset, SEEK_SET);
00221
00222
00223 if ((sample->stream == film->video_stream_index) &&
00224 (film->video_type == CODEC_ID_CINEPAK)) {
00225 pkt->pos= url_ftell(pb);
00226 if (av_new_packet(pkt, sample->sample_size))
00227 return AVERROR(ENOMEM);
00228 get_buffer(pb, pkt->data, sample->sample_size);
00229 } else if ((sample->stream == film->audio_stream_index) &&
00230 (film->audio_channels == 2)) {
00231
00232
00233 if (av_new_packet(pkt, sample->sample_size))
00234 return AVERROR(ENOMEM);
00235
00236
00237 if (sample->sample_size > film->stereo_buffer_size) {
00238 av_free(film->stereo_buffer);
00239 film->stereo_buffer_size = sample->sample_size;
00240 film->stereo_buffer = av_malloc(film->stereo_buffer_size);
00241 }
00242
00243 pkt->pos= url_ftell(pb);
00244 ret = get_buffer(pb, film->stereo_buffer, sample->sample_size);
00245 if (ret != sample->sample_size)
00246 ret = AVERROR(EIO);
00247
00248 left = 0;
00249 right = sample->sample_size / 2;
00250 for (i = 0; i < sample->sample_size; ) {
00251 if (film->audio_bits == 8) {
00252 pkt->data[i++] = film->stereo_buffer[left++];
00253 pkt->data[i++] = film->stereo_buffer[right++];
00254 } else {
00255 pkt->data[i++] = film->stereo_buffer[left++];
00256 pkt->data[i++] = film->stereo_buffer[left++];
00257 pkt->data[i++] = film->stereo_buffer[right++];
00258 pkt->data[i++] = film->stereo_buffer[right++];
00259 }
00260 }
00261 } else {
00262 ret= av_get_packet(pb, pkt, sample->sample_size);
00263 if (ret != sample->sample_size)
00264 ret = AVERROR(EIO);
00265 }
00266
00267 pkt->stream_index = sample->stream;
00268 pkt->pts = sample->pts;
00269
00270 film->current_sample++;
00271
00272 return ret;
00273 }
00274
00275 static int film_read_close(AVFormatContext *s)
00276 {
00277 FilmDemuxContext *film = s->priv_data;
00278
00279 av_free(film->sample_table);
00280 av_free(film->stereo_buffer);
00281
00282 return 0;
00283 }
00284
00285 AVInputFormat segafilm_demuxer = {
00286 "film_cpk",
00287 NULL_IF_CONFIG_SMALL("Sega FILM/CPK format"),
00288 sizeof(FilmDemuxContext),
00289 film_probe,
00290 film_read_header,
00291 film_read_packet,
00292 film_read_close,
00293 };