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00030 #include <time.h>
00031 #include "avformat.h"
00032 #include "dvdata.h"
00033 #include "dv.h"
00034
00035 struct DVDemuxContext {
00036 const DVprofile* sys;
00037 AVFormatContext* fctx;
00038 AVStream* vst;
00039 AVStream* ast[2];
00040 AVPacket audio_pkt[2];
00041 uint8_t audio_buf[2][8192];
00042 int ach;
00043 int frames;
00044 uint64_t abytes;
00045 };
00046
00047 static inline uint16_t dv_audio_12to16(uint16_t sample)
00048 {
00049 uint16_t shift, result;
00050
00051 sample = (sample < 0x800) ? sample : sample | 0xf000;
00052 shift = (sample & 0xf00) >> 8;
00053
00054 if (shift < 0x2 || shift > 0xd) {
00055 result = sample;
00056 } else if (shift < 0x8) {
00057 shift--;
00058 result = (sample - (256 * shift)) << shift;
00059 } else {
00060 shift = 0xe - shift;
00061 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
00062 }
00063
00064 return result;
00065 }
00066
00067
00068
00069
00070
00071
00072 static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
00073 {
00074 int offs;
00075
00076 switch (t) {
00077 case dv_audio_source:
00078 offs = (80*6 + 80*16*3 + 3);
00079 break;
00080 case dv_audio_control:
00081 offs = (80*6 + 80*16*4 + 3);
00082 break;
00083 case dv_video_control:
00084 offs = (80*5 + 48 + 5);
00085 break;
00086 default:
00087 return NULL;
00088 }
00089
00090 return (frame[offs] == t ? &frame[offs] : NULL);
00091 }
00092
00093
00094
00095
00096
00097
00098
00099
00100
00101 static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
00102 const DVprofile *sys)
00103 {
00104 int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
00105 uint16_t lc, rc;
00106 const uint8_t* as_pack;
00107
00108 as_pack = dv_extract_pack(frame, dv_audio_source);
00109 if (!as_pack)
00110 return 0;
00111
00112 smpls = as_pack[1] & 0x3f;
00113 freq = (as_pack[4] >> 3) & 0x07;
00114 quant = as_pack[4] & 0x07;
00115
00116 if (quant > 1)
00117 return -1;
00118
00119 size = (sys->audio_min_samples[freq] + smpls) * 4;
00120 half_ch = sys->difseg_size/2;
00121
00122
00123 for (chan = 0; chan < sys->n_difchan; chan++) {
00124
00125 for (i = 0; i < sys->difseg_size; i++) {
00126 frame += 6 * 80;
00127 if (quant == 1 && i == half_ch) {
00128
00129 if (!pcm2)
00130 break;
00131 else
00132 pcm = pcm2;
00133 }
00134
00135
00136 for (j = 0; j < 9; j++) {
00137 for (d = 8; d < 80; d += 2) {
00138 if (quant == 0) {
00139 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
00140 if (of*2 >= size)
00141 continue;
00142
00143 pcm[of*2] = frame[d+1];
00144 pcm[of*2+1] = frame[d];
00145 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
00146 pcm[of*2+1] = 0;
00147 } else {
00148 lc = ((uint16_t)frame[d] << 4) |
00149 ((uint16_t)frame[d+2] >> 4);
00150 rc = ((uint16_t)frame[d+1] << 4) |
00151 ((uint16_t)frame[d+2] & 0x0f);
00152 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
00153 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
00154
00155 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
00156 if (of*2 >= size)
00157 continue;
00158
00159 pcm[of*2] = lc & 0xff;
00160 pcm[of*2+1] = lc >> 8;
00161 of = sys->audio_shuffle[i%half_ch+half_ch][j] +
00162 (d - 8)/3 * sys->audio_stride;
00163 pcm[of*2] = rc & 0xff;
00164 pcm[of*2+1] = rc >> 8;
00165 ++d;
00166 }
00167 }
00168
00169 frame += 16 * 80;
00170 }
00171 }
00172
00173
00174 if(!pcm2)
00175 break;
00176 pcm = pcm2;
00177 }
00178
00179 return size;
00180 }
00181
00182 static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
00183 {
00184 const uint8_t* as_pack;
00185 int freq, stype, smpls, quant, i, ach;
00186
00187 as_pack = dv_extract_pack(frame, dv_audio_source);
00188 if (!as_pack || !c->sys) {
00189 c->ach = 0;
00190 return 0;
00191 }
00192
00193 smpls = as_pack[1] & 0x3f;
00194 freq = (as_pack[4] >> 3) & 0x07;
00195 stype = (as_pack[3] & 0x1f);
00196 quant = as_pack[4] & 0x07;
00197
00198
00199 ach = (stype == 2 || (quant && (freq == 2))) ? 2 : 1;
00200
00201
00202 for (i=0; i<ach; i++) {
00203 if (!c->ast[i]) {
00204 c->ast[i] = av_new_stream(c->fctx, 0);
00205 if (!c->ast[i])
00206 break;
00207 av_set_pts_info(c->ast[i], 64, 1, 30000);
00208 c->ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
00209 c->ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
00210
00211 av_init_packet(&c->audio_pkt[i]);
00212 c->audio_pkt[i].size = 0;
00213 c->audio_pkt[i].data = c->audio_buf[i];
00214 c->audio_pkt[i].stream_index = c->ast[i]->index;
00215 c->audio_pkt[i].flags |= PKT_FLAG_KEY;
00216 }
00217 c->ast[i]->codec->sample_rate = dv_audio_frequency[freq];
00218 c->ast[i]->codec->channels = 2;
00219 c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
00220 c->ast[i]->start_time = 0;
00221 }
00222 c->ach = i;
00223
00224 return (c->sys->audio_min_samples[freq] + smpls) * 4; ;
00225 }
00226
00227 static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
00228 {
00229 const uint8_t* vsc_pack;
00230 AVCodecContext* avctx;
00231 int apt, is16_9;
00232 int size = 0;
00233
00234 if (c->sys) {
00235 avctx = c->vst->codec;
00236
00237 av_set_pts_info(c->vst, 64, c->sys->frame_rate_base, c->sys->frame_rate);
00238 avctx->time_base= (AVRational){c->sys->frame_rate_base, c->sys->frame_rate};
00239 if(!avctx->width){
00240 avctx->width = c->sys->width;
00241 avctx->height = c->sys->height;
00242 }
00243 avctx->pix_fmt = c->sys->pix_fmt;
00244
00245
00246 vsc_pack = dv_extract_pack(frame, dv_video_control);
00247 apt = frame[4] & 0x07;
00248 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
00249 (!apt && (vsc_pack[2] & 0x07) == 0x07)));
00250 avctx->sample_aspect_ratio = c->sys->sar[is16_9];
00251 avctx->bit_rate = av_rescale(c->sys->frame_size * 8,
00252 c->sys->frame_rate,
00253 c->sys->frame_rate_base);
00254 size = c->sys->frame_size;
00255 }
00256 return size;
00257 }
00258
00259
00260
00261
00262
00263 DVDemuxContext* dv_init_demux(AVFormatContext *s)
00264 {
00265 DVDemuxContext *c;
00266
00267 c = av_mallocz(sizeof(DVDemuxContext));
00268 if (!c)
00269 return NULL;
00270
00271 c->vst = av_new_stream(s, 0);
00272 if (!c->vst) {
00273 av_free(c);
00274 return NULL;
00275 }
00276
00277 c->sys = NULL;
00278 c->fctx = s;
00279 c->ast[0] = c->ast[1] = NULL;
00280 c->ach = 0;
00281 c->frames = 0;
00282 c->abytes = 0;
00283
00284 c->vst->codec->codec_type = CODEC_TYPE_VIDEO;
00285 c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
00286 c->vst->codec->bit_rate = 25000000;
00287 c->vst->start_time = 0;
00288
00289 return c;
00290 }
00291
00292 int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
00293 {
00294 int size = -1;
00295 int i;
00296
00297 for (i=0; i<c->ach; i++) {
00298 if (c->ast[i] && c->audio_pkt[i].size) {
00299 *pkt = c->audio_pkt[i];
00300 c->audio_pkt[i].size = 0;
00301 size = pkt->size;
00302 break;
00303 }
00304 }
00305
00306 return size;
00307 }
00308
00309 int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
00310 uint8_t* buf, int buf_size)
00311 {
00312 int size, i;
00313
00314 if (buf_size < DV_PROFILE_BYTES ||
00315 !(c->sys = dv_frame_profile(buf)) ||
00316 buf_size < c->sys->frame_size) {
00317 return -1;
00318 }
00319
00320
00321
00322 size = dv_extract_audio_info(c, buf);
00323 for (i=0; i<c->ach; i++) {
00324 c->audio_pkt[i].size = size;
00325 c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
00326 }
00327 dv_extract_audio(buf, c->audio_buf[0], c->audio_buf[1], c->sys);
00328 c->abytes += size;
00329
00330
00331 size = dv_extract_video_info(c, buf);
00332 av_init_packet(pkt);
00333 pkt->data = buf;
00334 pkt->size = size;
00335 pkt->flags |= PKT_FLAG_KEY;
00336 pkt->stream_index = c->vst->id;
00337 pkt->pts = c->frames;
00338
00339 c->frames++;
00340
00341 return size;
00342 }
00343
00344 static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
00345 int64_t timestamp, int flags)
00346 {
00347
00348 const DVprofile* sys = dv_codec_profile(c->vst->codec);
00349 int64_t offset;
00350 int64_t size = url_fsize(s->pb);
00351 int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;
00352
00353 offset = sys->frame_size * timestamp;
00354
00355 if (offset > max_offset) offset = max_offset;
00356 else if (offset < 0) offset = 0;
00357
00358 return offset;
00359 }
00360
00361 void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
00362 {
00363 c->frames= frame_offset;
00364 if (c->ach)
00365 c->abytes= av_rescale(c->frames,
00366 c->ast[0]->codec->bit_rate * (int64_t)c->sys->frame_rate_base,
00367 8*c->sys->frame_rate);
00368 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
00369 }
00370
00371
00372
00373
00374
00375 typedef struct RawDVContext {
00376 DVDemuxContext* dv_demux;
00377 uint8_t buf[DV_MAX_FRAME_SIZE];
00378 } RawDVContext;
00379
00380 static int dv_read_header(AVFormatContext *s,
00381 AVFormatParameters *ap)
00382 {
00383 RawDVContext *c = s->priv_data;
00384
00385 c->dv_demux = dv_init_demux(s);
00386 if (!c->dv_demux)
00387 return -1;
00388
00389 if (get_buffer(s->pb, c->buf, DV_PROFILE_BYTES) <= 0 ||
00390 url_fseek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0)
00391 return AVERROR(EIO);
00392
00393 c->dv_demux->sys = dv_frame_profile(c->buf);
00394 s->bit_rate = av_rescale(c->dv_demux->sys->frame_size * 8,
00395 c->dv_demux->sys->frame_rate,
00396 c->dv_demux->sys->frame_rate_base);
00397
00398 return 0;
00399 }
00400
00401
00402 static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
00403 {
00404 int size;
00405 RawDVContext *c = s->priv_data;
00406
00407 size = dv_get_packet(c->dv_demux, pkt);
00408
00409 if (size < 0) {
00410 size = c->dv_demux->sys->frame_size;
00411 if (get_buffer(s->pb, c->buf, size) <= 0)
00412 return AVERROR(EIO);
00413
00414 size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
00415 }
00416
00417 return size;
00418 }
00419
00420 static int dv_read_seek(AVFormatContext *s, int stream_index,
00421 int64_t timestamp, int flags)
00422 {
00423 RawDVContext *r = s->priv_data;
00424 DVDemuxContext *c = r->dv_demux;
00425 int64_t offset= dv_frame_offset(s, c, timestamp, flags);
00426
00427 dv_offset_reset(c, offset / c->sys->frame_size);
00428
00429 offset = url_fseek(s->pb, offset, SEEK_SET);
00430 return (offset < 0)?offset:0;
00431 }
00432
00433 static int dv_read_close(AVFormatContext *s)
00434 {
00435 RawDVContext *c = s->priv_data;
00436 av_free(c->dv_demux);
00437 return 0;
00438 }
00439
00440 #ifdef CONFIG_DV_DEMUXER
00441 AVInputFormat dv_demuxer = {
00442 "dv",
00443 "DV video format",
00444 sizeof(RawDVContext),
00445 NULL,
00446 dv_read_header,
00447 dv_read_packet,
00448 dv_read_close,
00449 dv_read_seek,
00450 .extensions = "dv,dif",
00451 };
00452 #endif