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00021 #include "avformat.h"
00022 #include "internal.h"
00023
00024 #define Y4M_MAGIC "YUV4MPEG2"
00025 #define Y4M_FRAME_MAGIC "FRAME"
00026 #define Y4M_LINE_MAX 256
00027
00028 struct frame_attributes {
00029 int interlaced_frame;
00030 int top_field_first;
00031 };
00032
00033 #if CONFIG_YUV4MPEGPIPE_MUXER
00034 static int yuv4_generate_header(AVFormatContext *s, char* buf)
00035 {
00036 AVStream *st;
00037 int width, height;
00038 int raten, rated, aspectn, aspectd, n;
00039 char inter;
00040 const char *colorspace = "";
00041
00042 st = s->streams[0];
00043 width = st->codec->width;
00044 height = st->codec->height;
00045
00046 av_reduce(&raten, &rated, st->codec->time_base.den,
00047 st->codec->time_base.num, (1UL << 31) - 1);
00048
00049 aspectn = st->sample_aspect_ratio.num;
00050 aspectd = st->sample_aspect_ratio.den;
00051
00052 if (aspectn == 0 && aspectd == 1)
00053 aspectd = 0;
00054
00055 inter = 'p';
00056 if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
00057 inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
00058
00059 switch (st->codec->pix_fmt) {
00060 case PIX_FMT_GRAY8:
00061 colorspace = " Cmono";
00062 break;
00063 case PIX_FMT_YUV411P:
00064 colorspace = " C411 XYSCSS=411";
00065 break;
00066 case PIX_FMT_YUV420P:
00067 switch (st->codec->chroma_sample_location) {
00068 case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
00069 case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
00070 default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
00071 }
00072 break;
00073 case PIX_FMT_YUV422P:
00074 colorspace = " C422 XYSCSS=422";
00075 break;
00076 case PIX_FMT_YUV444P:
00077 colorspace = " C444 XYSCSS=444";
00078 break;
00079 }
00080
00081
00082 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
00083 Y4M_MAGIC, width, height, raten, rated, inter,
00084 aspectn, aspectd, colorspace);
00085
00086 return n;
00087 }
00088
00089 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
00090 {
00091 AVStream *st = s->streams[pkt->stream_index];
00092 AVIOContext *pb = s->pb;
00093 AVPicture *picture;
00094 int* first_pkt = s->priv_data;
00095 int width, height, h_chroma_shift, v_chroma_shift;
00096 int i;
00097 char buf2[Y4M_LINE_MAX + 1];
00098 char buf1[20];
00099 uint8_t *ptr, *ptr1, *ptr2;
00100
00101 picture = (AVPicture *)pkt->data;
00102
00103
00104 if (*first_pkt) {
00105 *first_pkt = 0;
00106 if (yuv4_generate_header(s, buf2) < 0) {
00107 av_log(s, AV_LOG_ERROR,
00108 "Error. YUV4MPEG stream header write failed.\n");
00109 return AVERROR(EIO);
00110 } else {
00111 avio_write(pb, buf2, strlen(buf2));
00112 }
00113 }
00114
00115
00116
00117 snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
00118 avio_write(pb, buf1, strlen(buf1));
00119
00120 width = st->codec->width;
00121 height = st->codec->height;
00122
00123 ptr = picture->data[0];
00124 for (i = 0; i < height; i++) {
00125 avio_write(pb, ptr, width);
00126 ptr += picture->linesize[0];
00127 }
00128
00129 if (st->codec->pix_fmt != PIX_FMT_GRAY8) {
00130
00131 avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
00132 &v_chroma_shift);
00133 width >>= h_chroma_shift;
00134 height >>= v_chroma_shift;
00135
00136 ptr1 = picture->data[1];
00137 ptr2 = picture->data[2];
00138 for (i = 0; i < height; i++) {
00139 avio_write(pb, ptr1, width);
00140 ptr1 += picture->linesize[1];
00141 }
00142 for (i = 0; i < height; i++) {
00143 avio_write(pb, ptr2, width);
00144 ptr2 += picture->linesize[2];
00145 }
00146 }
00147 avio_flush(pb);
00148 return 0;
00149 }
00150
00151 static int yuv4_write_header(AVFormatContext *s)
00152 {
00153 int *first_pkt = s->priv_data;
00154
00155 if (s->nb_streams != 1)
00156 return AVERROR(EIO);
00157
00158 if (s->streams[0]->codec->codec_id != CODEC_ID_RAWVIDEO) {
00159 av_log(s, AV_LOG_ERROR,
00160 "A non-rawvideo stream was selected, but yuv4mpeg only handles rawvideo streams\n");
00161 return AVERROR(EINVAL);
00162 }
00163
00164 if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
00165 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
00166 "stream, some mjpegtools might not work.\n");
00167 } else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
00168 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
00169 (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
00170 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
00171 av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
00172 "yuv422p, yuv420p, yuv411p and gray pixel formats. "
00173 "Use -pix_fmt to select one.\n");
00174 return AVERROR(EIO);
00175 }
00176
00177 *first_pkt = 1;
00178 return 0;
00179 }
00180
00181 AVOutputFormat ff_yuv4mpegpipe_muxer = {
00182 .name = "yuv4mpegpipe",
00183 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00184 .extensions = "y4m",
00185 .priv_data_size = sizeof(int),
00186 .audio_codec = CODEC_ID_NONE,
00187 .video_codec = CODEC_ID_RAWVIDEO,
00188 .write_header = yuv4_write_header,
00189 .write_packet = yuv4_write_packet,
00190 .flags = AVFMT_RAWPICTURE,
00191 };
00192 #endif
00193
00194
00195 #define MAX_YUV4_HEADER 80
00196 #define MAX_FRAME_HEADER 80
00197
00198 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
00199 {
00200 char header[MAX_YUV4_HEADER + 10];
00201
00202 char *tokstart, *tokend, *header_end;
00203 int i;
00204 AVIOContext *pb = s->pb;
00205 int width = -1, height = -1, raten = 0,
00206 rated = 0, aspectn = 0, aspectd = 0;
00207 enum PixelFormat pix_fmt = PIX_FMT_NONE, alt_pix_fmt = PIX_FMT_NONE;
00208 enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
00209 AVStream *st;
00210 struct frame_attributes *s1 = s->priv_data;
00211
00212 for (i = 0; i < MAX_YUV4_HEADER; i++) {
00213 header[i] = avio_r8(pb);
00214 if (header[i] == '\n') {
00215 header[i + 1] = 0x20;
00216
00217 header[i + 2] = 0;
00218 break;
00219 }
00220 }
00221 if (i == MAX_YUV4_HEADER)
00222 return -1;
00223 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
00224 return -1;
00225
00226 s1->interlaced_frame = 0;
00227 s1->top_field_first = 0;
00228 header_end = &header[i + 1];
00229 for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
00230 tokstart < header_end; tokstart++) {
00231 if (*tokstart == 0x20)
00232 continue;
00233 switch (*tokstart++) {
00234 case 'W':
00235 width = strtol(tokstart, &tokend, 10);
00236 tokstart = tokend;
00237 break;
00238 case 'H':
00239 height = strtol(tokstart, &tokend, 10);
00240 tokstart = tokend;
00241 break;
00242 case 'C':
00243 if (strncmp("420jpeg", tokstart, 7) == 0) {
00244 pix_fmt = PIX_FMT_YUV420P;
00245 chroma_sample_location = AVCHROMA_LOC_CENTER;
00246 } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
00247 pix_fmt = PIX_FMT_YUV420P;
00248 chroma_sample_location = AVCHROMA_LOC_LEFT;
00249 } else if (strncmp("420paldv", tokstart, 8) == 0) {
00250 pix_fmt = PIX_FMT_YUV420P;
00251 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
00252 } else if (strncmp("411", tokstart, 3) == 0)
00253 pix_fmt = PIX_FMT_YUV411P;
00254 else if (strncmp("422", tokstart, 3) == 0)
00255 pix_fmt = PIX_FMT_YUV422P;
00256 else if (strncmp("444alpha", tokstart, 8) == 0 ) {
00257 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
00258 "YUV4MPEG stream.\n");
00259 return -1;
00260 } else if (strncmp("444", tokstart, 3) == 0)
00261 pix_fmt = PIX_FMT_YUV444P;
00262 else if (strncmp("mono", tokstart, 4) == 0) {
00263 pix_fmt = PIX_FMT_GRAY8;
00264 } else {
00265 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
00266 "pixel format.\n");
00267 return -1;
00268 }
00269 while (tokstart < header_end && *tokstart != 0x20)
00270 tokstart++;
00271 break;
00272 case 'I':
00273 switch (*tokstart++){
00274 case '?':
00275 break;
00276 case 'p':
00277 s1->interlaced_frame = 0;
00278 break;
00279 case 't':
00280 s1->interlaced_frame = 1;
00281 s1->top_field_first = 1;
00282 break;
00283 case 'b':
00284 s1->interlaced_frame = 1;
00285 s1->top_field_first = 0;
00286 break;
00287 case 'm':
00288 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
00289 "interlaced and non-interlaced frames.\n");
00290 return -1;
00291 default:
00292 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00293 return -1;
00294 }
00295 break;
00296 case 'F':
00297 sscanf(tokstart, "%d:%d", &raten, &rated);
00298 while (tokstart < header_end && *tokstart != 0x20)
00299 tokstart++;
00300 break;
00301 case 'A':
00302 sscanf(tokstart, "%d:%d", &aspectn, &aspectd);
00303 while (tokstart < header_end && *tokstart != 0x20)
00304 tokstart++;
00305 break;
00306 case 'X':
00307 if (strncmp("YSCSS=", tokstart, 6) == 0) {
00308
00309 tokstart += 6;
00310 if (strncmp("420JPEG", tokstart, 7) == 0)
00311 alt_pix_fmt = PIX_FMT_YUV420P;
00312 else if (strncmp("420MPEG2", tokstart, 8) == 0)
00313 alt_pix_fmt = PIX_FMT_YUV420P;
00314 else if (strncmp("420PALDV", tokstart, 8) == 0)
00315 alt_pix_fmt = PIX_FMT_YUV420P;
00316 else if (strncmp("411", tokstart, 3) == 0)
00317 alt_pix_fmt = PIX_FMT_YUV411P;
00318 else if (strncmp("422", tokstart, 3) == 0)
00319 alt_pix_fmt = PIX_FMT_YUV422P;
00320 else if (strncmp("444", tokstart, 3) == 0)
00321 alt_pix_fmt = PIX_FMT_YUV444P;
00322 }
00323 while (tokstart < header_end && *tokstart != 0x20)
00324 tokstart++;
00325 break;
00326 }
00327 }
00328
00329 if (width == -1 || height == -1) {
00330 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00331 return -1;
00332 }
00333
00334 if (pix_fmt == PIX_FMT_NONE) {
00335 if (alt_pix_fmt == PIX_FMT_NONE)
00336 pix_fmt = PIX_FMT_YUV420P;
00337 else
00338 pix_fmt = alt_pix_fmt;
00339 }
00340
00341 if (raten <= 0 || rated <= 0) {
00342
00343 raten = 25;
00344 rated = 1;
00345 }
00346
00347 if (aspectn == 0 && aspectd == 0) {
00348
00349 aspectd = 1;
00350 }
00351
00352 st = avformat_new_stream(s, NULL);
00353 if (!st)
00354 return AVERROR(ENOMEM);
00355 st->codec->width = width;
00356 st->codec->height = height;
00357 av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
00358 avpriv_set_pts_info(st, 64, rated, raten);
00359 st->codec->pix_fmt = pix_fmt;
00360 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00361 st->codec->codec_id = CODEC_ID_RAWVIDEO;
00362 st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
00363 st->codec->chroma_sample_location = chroma_sample_location;
00364
00365 return 0;
00366 }
00367
00368 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
00369 {
00370 int i;
00371 char header[MAX_FRAME_HEADER+1];
00372 int packet_size, width, height, ret;
00373 AVStream *st = s->streams[0];
00374 struct frame_attributes *s1 = s->priv_data;
00375
00376 for (i = 0; i < MAX_FRAME_HEADER; i++) {
00377 header[i] = avio_r8(s->pb);
00378 if (header[i] == '\n') {
00379 header[i + 1] = 0;
00380 break;
00381 }
00382 }
00383 if (s->pb->error)
00384 return s->pb->error;
00385 else if (s->pb->eof_reached)
00386 return AVERROR_EOF;
00387 else if (i == MAX_FRAME_HEADER)
00388 return AVERROR_INVALIDDATA;
00389
00390 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
00391 return AVERROR_INVALIDDATA;
00392
00393 width = st->codec->width;
00394 height = st->codec->height;
00395
00396 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
00397 if (packet_size < 0)
00398 return packet_size;
00399
00400 ret = av_get_packet(s->pb, pkt, packet_size);
00401 if (ret < 0)
00402 return ret;
00403 else if (ret != packet_size)
00404 return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
00405
00406 if (st->codec->coded_frame) {
00407 st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
00408 st->codec->coded_frame->top_field_first = s1->top_field_first;
00409 }
00410
00411 pkt->stream_index = 0;
00412 return 0;
00413 }
00414
00415 static int yuv4_probe(AVProbeData *pd)
00416 {
00417
00418 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
00419 return AVPROBE_SCORE_MAX;
00420 else
00421 return 0;
00422 }
00423
00424 #if CONFIG_YUV4MPEGPIPE_DEMUXER
00425 AVInputFormat ff_yuv4mpegpipe_demuxer = {
00426 .name = "yuv4mpegpipe",
00427 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00428 .priv_data_size = sizeof(struct frame_attributes),
00429 .read_probe = yuv4_probe,
00430 .read_header = yuv4_read_header,
00431 .read_packet = yuv4_read_packet,
00432 .extensions = "y4m"
00433 };
00434 #endif