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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->pix_fmt == PIX_FMT_YUV411P) {
00159 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
00160 "stream, some mjpegtools might not work.\n");
00161 } else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
00162 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
00163 (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
00164 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
00165 av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
00166 "yuv422p, yuv420p, yuv411p and gray pixel formats. "
00167 "Use -pix_fmt to select one.\n");
00168 return AVERROR(EIO);
00169 }
00170
00171 *first_pkt = 1;
00172 return 0;
00173 }
00174
00175 AVOutputFormat ff_yuv4mpegpipe_muxer = {
00176 .name = "yuv4mpegpipe",
00177 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00178 .mime_type = "",
00179 .extensions = "y4m",
00180 .priv_data_size = sizeof(int),
00181 .audio_codec = CODEC_ID_NONE,
00182 .video_codec = CODEC_ID_RAWVIDEO,
00183 .write_header = yuv4_write_header,
00184 .write_packet = yuv4_write_packet,
00185 .flags = AVFMT_RAWPICTURE,
00186 };
00187 #endif
00188
00189
00190 #define MAX_YUV4_HEADER 80
00191 #define MAX_FRAME_HEADER 80
00192
00193 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
00194 {
00195 char header[MAX_YUV4_HEADER + 10];
00196
00197 char *tokstart, *tokend, *header_end;
00198 int i;
00199 AVIOContext *pb = s->pb;
00200 int width = -1, height = -1, raten = 0,
00201 rated = 0, aspectn = 0, aspectd = 0;
00202 enum PixelFormat pix_fmt = PIX_FMT_NONE, alt_pix_fmt = PIX_FMT_NONE;
00203 enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
00204 AVStream *st;
00205 struct frame_attributes *s1 = s->priv_data;
00206
00207 for (i = 0; i < MAX_YUV4_HEADER; i++) {
00208 header[i] = avio_r8(pb);
00209 if (header[i] == '\n') {
00210 header[i + 1] = 0x20;
00211
00212 header[i + 2] = 0;
00213 break;
00214 }
00215 }
00216 if (i == MAX_YUV4_HEADER)
00217 return -1;
00218 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
00219 return -1;
00220
00221 s1->interlaced_frame = 0;
00222 s1->top_field_first = 0;
00223 header_end = &header[i + 1];
00224 for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
00225 tokstart < header_end; tokstart++) {
00226 if (*tokstart == 0x20)
00227 continue;
00228 switch (*tokstart++) {
00229 case 'W':
00230 width = strtol(tokstart, &tokend, 10);
00231 tokstart = tokend;
00232 break;
00233 case 'H':
00234 height = strtol(tokstart, &tokend, 10);
00235 tokstart = tokend;
00236 break;
00237 case 'C':
00238 if (strncmp("420jpeg", tokstart, 7) == 0) {
00239 pix_fmt = PIX_FMT_YUV420P;
00240 chroma_sample_location = AVCHROMA_LOC_CENTER;
00241 } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
00242 pix_fmt = PIX_FMT_YUV420P;
00243 chroma_sample_location = AVCHROMA_LOC_LEFT;
00244 } else if (strncmp("420paldv", tokstart, 8) == 0) {
00245 pix_fmt = PIX_FMT_YUV420P;
00246 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
00247 } else if (strncmp("411", tokstart, 3) == 0)
00248 pix_fmt = PIX_FMT_YUV411P;
00249 else if (strncmp("422", tokstart, 3) == 0)
00250 pix_fmt = PIX_FMT_YUV422P;
00251 else if (strncmp("444alpha", tokstart, 8) == 0 ) {
00252 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
00253 "YUV4MPEG stream.\n");
00254 return -1;
00255 } else if (strncmp("444", tokstart, 3) == 0)
00256 pix_fmt = PIX_FMT_YUV444P;
00257 else if (strncmp("mono", tokstart, 4) == 0) {
00258 pix_fmt = PIX_FMT_GRAY8;
00259 } else {
00260 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
00261 "pixel format.\n");
00262 return -1;
00263 }
00264 while (tokstart < header_end && *tokstart != 0x20)
00265 tokstart++;
00266 break;
00267 case 'I':
00268 switch (*tokstart++){
00269 case '?':
00270 break;
00271 case 'p':
00272 s1->interlaced_frame = 0;
00273 break;
00274 case 't':
00275 s1->interlaced_frame = 1;
00276 s1->top_field_first = 1;
00277 break;
00278 case 'b':
00279 s1->interlaced_frame = 1;
00280 s1->top_field_first = 0;
00281 break;
00282 case 'm':
00283 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
00284 "interlaced and non-interlaced frames.\n");
00285 return -1;
00286 default:
00287 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00288 return -1;
00289 }
00290 break;
00291 case 'F':
00292 sscanf(tokstart, "%d:%d", &raten, &rated);
00293 while (tokstart < header_end && *tokstart != 0x20)
00294 tokstart++;
00295 break;
00296 case 'A':
00297 sscanf(tokstart, "%d:%d", &aspectn, &aspectd);
00298 while (tokstart < header_end && *tokstart != 0x20)
00299 tokstart++;
00300 break;
00301 case 'X':
00302 if (strncmp("YSCSS=", tokstart, 6) == 0) {
00303
00304 tokstart += 6;
00305 if (strncmp("420JPEG", tokstart, 7) == 0)
00306 alt_pix_fmt = PIX_FMT_YUV420P;
00307 else if (strncmp("420MPEG2", tokstart, 8) == 0)
00308 alt_pix_fmt = PIX_FMT_YUV420P;
00309 else if (strncmp("420PALDV", tokstart, 8) == 0)
00310 alt_pix_fmt = PIX_FMT_YUV420P;
00311 else if (strncmp("411", tokstart, 3) == 0)
00312 alt_pix_fmt = PIX_FMT_YUV411P;
00313 else if (strncmp("422", tokstart, 3) == 0)
00314 alt_pix_fmt = PIX_FMT_YUV422P;
00315 else if (strncmp("444", tokstart, 3) == 0)
00316 alt_pix_fmt = PIX_FMT_YUV444P;
00317 }
00318 while (tokstart < header_end && *tokstart != 0x20)
00319 tokstart++;
00320 break;
00321 }
00322 }
00323
00324 if (width == -1 || height == -1) {
00325 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00326 return -1;
00327 }
00328
00329 if (pix_fmt == PIX_FMT_NONE) {
00330 if (alt_pix_fmt == PIX_FMT_NONE)
00331 pix_fmt = PIX_FMT_YUV420P;
00332 else
00333 pix_fmt = alt_pix_fmt;
00334 }
00335
00336 if (raten <= 0 || rated <= 0) {
00337
00338 raten = 25;
00339 rated = 1;
00340 }
00341
00342 if (aspectn == 0 && aspectd == 0) {
00343
00344 aspectd = 1;
00345 }
00346
00347 st = avformat_new_stream(s, NULL);
00348 if (!st)
00349 return AVERROR(ENOMEM);
00350 st->codec->width = width;
00351 st->codec->height = height;
00352 av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
00353 avpriv_set_pts_info(st, 64, rated, raten);
00354 st->codec->pix_fmt = pix_fmt;
00355 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00356 st->codec->codec_id = CODEC_ID_RAWVIDEO;
00357 st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
00358 st->codec->chroma_sample_location = chroma_sample_location;
00359
00360 return 0;
00361 }
00362
00363 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
00364 {
00365 int i;
00366 char header[MAX_FRAME_HEADER+1];
00367 int packet_size, width, height, ret;
00368 AVStream *st = s->streams[0];
00369 struct frame_attributes *s1 = s->priv_data;
00370
00371 for (i = 0; i < MAX_FRAME_HEADER; i++) {
00372 header[i] = avio_r8(s->pb);
00373 if (header[i] == '\n') {
00374 header[i + 1] = 0;
00375 break;
00376 }
00377 }
00378 if (s->pb->error)
00379 return s->pb->error;
00380 else if (s->pb->eof_reached)
00381 return AVERROR_EOF;
00382 else if (i == MAX_FRAME_HEADER)
00383 return AVERROR_INVALIDDATA;
00384
00385 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
00386 return AVERROR_INVALIDDATA;
00387
00388 width = st->codec->width;
00389 height = st->codec->height;
00390
00391 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
00392 if (packet_size < 0)
00393 return packet_size;
00394
00395 ret = av_get_packet(s->pb, pkt, packet_size);
00396 if (ret < 0)
00397 return ret;
00398 else if (ret != packet_size)
00399 return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
00400
00401 if (st->codec->coded_frame) {
00402 st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
00403 st->codec->coded_frame->top_field_first = s1->top_field_first;
00404 }
00405
00406 pkt->stream_index = 0;
00407 return 0;
00408 }
00409
00410 static int yuv4_probe(AVProbeData *pd)
00411 {
00412
00413 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
00414 return AVPROBE_SCORE_MAX;
00415 else
00416 return 0;
00417 }
00418
00419 #if CONFIG_YUV4MPEGPIPE_DEMUXER
00420 AVInputFormat ff_yuv4mpegpipe_demuxer = {
00421 .name = "yuv4mpegpipe",
00422 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00423 .priv_data_size = sizeof(struct frame_attributes),
00424 .read_probe = yuv4_probe,
00425 .read_header = yuv4_read_header,
00426 .read_packet = yuv4_read_packet,
00427 .extensions = "y4m"
00428 };
00429 #endif