3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #define Y4M_MAGIC "YUV4MPEG2"
22 #define Y4M_FRAME_MAGIC "FRAME"
23 #define Y4M_LINE_MAX 256
25 struct frame_attributes {
32 static int yuv4_generate_header(AVFormatContext *s, char* buf)
36 int raten, rated, aspectn, aspectd, n;
38 char *colorspace = "";
41 width = st->codec->width;
42 height = st->codec->height;
44 av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
46 aspectn = st->codec->sample_aspect_ratio.num;
47 aspectd = st->codec->sample_aspect_ratio.den;
49 if ( aspectn == 0 && aspectd == 1 ) aspectd = 0; // 0:0 means unknown
51 inter = 'p'; /* progressive is the default */
52 if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
53 inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
56 switch(st->codec->pix_fmt) {
58 colorspace = " Cmono";
61 colorspace = " C411 XYSCSS=411";
64 colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
67 colorspace = " C422 XYSCSS=422";
70 colorspace = " C444 XYSCSS=444";
74 /* construct stream header, if this is the first frame */
75 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
87 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
89 AVStream *st = s->streams[pkt->stream_index];
90 ByteIOContext *pb = &s->pb;
92 int* first_pkt = s->priv_data;
93 int width, height, h_chroma_shift, v_chroma_shift;
95 char buf2[Y4M_LINE_MAX+1];
97 uint8_t *ptr, *ptr1, *ptr2;
99 picture = (AVPicture *)pkt->data;
101 /* for the first packet we have to output the header as well */
104 if (yuv4_generate_header(s, buf2) < 0) {
105 av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
108 put_buffer(pb, buf2, strlen(buf2));
112 /* construct frame header */
114 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
115 put_buffer(pb, buf1, strlen(buf1));
117 width = st->codec->width;
118 height = st->codec->height;
120 ptr = picture->data[0];
121 for(i=0;i<height;i++) {
122 put_buffer(pb, ptr, width);
123 ptr += picture->linesize[0];
126 if (st->codec->pix_fmt != PIX_FMT_GRAY8){
127 // Adjust for smaller Cb and Cr planes
128 avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
129 width >>= h_chroma_shift;
130 height >>= v_chroma_shift;
132 ptr1 = picture->data[1];
133 ptr2 = picture->data[2];
134 for(i=0;i<height;i++) { /* Cb */
135 put_buffer(pb, ptr1, width);
136 ptr1 += picture->linesize[1];
138 for(i=0;i<height;i++) { /* Cr */
139 put_buffer(pb, ptr2, width);
140 ptr2 += picture->linesize[2];
143 put_flush_packet(pb);
147 static int yuv4_write_header(AVFormatContext *s)
149 int* first_pkt = s->priv_data;
151 if (s->nb_streams != 1)
154 if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
155 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
157 else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
158 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
159 (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
160 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
161 av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, yuv422p, yuv420p, yuv411p and gray pixel formats. Use -pix_fmt to select one.\n");
169 static int yuv4_write_trailer(AVFormatContext *s)
174 AVOutputFormat yuv4mpegpipe_oformat = {
176 "YUV4MPEG pipe format",
185 .flags = AVFMT_RAWPICTURE,
187 #endif //CONFIG_MUXERS
189 /* Header size increased to allow room for optional flags */
190 #define MAX_YUV4_HEADER 80
191 #define MAX_FRAME_HEADER 80
193 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
195 char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option
196 char *tokstart,*tokend,*header_end;
198 ByteIOContext *pb = &s->pb;
199 int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
200 enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
202 struct frame_attributes *s1 = s->priv_data;
204 for (i=0; i<MAX_YUV4_HEADER; i++) {
205 header[i] = get_byte(pb);
206 if (header[i] == '\n') {
207 header[i+1] = 0x20; // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
212 if (i == MAX_YUV4_HEADER) return -1;
213 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
215 s1->interlaced_frame = 0;
216 s1->top_field_first = 0;
217 header_end = &header[i+1]; // Include space
218 for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
219 if (*tokstart==0x20) continue;
220 switch (*tokstart++) {
221 case 'W': // Width. Required.
222 width = strtol(tokstart, &tokend, 10);
225 case 'H': // Height. Required.
226 height = strtol(tokstart, &tokend, 10);
229 case 'C': // Color space
230 if (strncmp("420jpeg",tokstart,7)==0)
231 pix_fmt = PIX_FMT_YUV420P;
232 else if (strncmp("420mpeg2",tokstart,8)==0)
233 pix_fmt = PIX_FMT_YUV420P;
234 else if (strncmp("420paldv", tokstart, 8)==0)
235 pix_fmt = PIX_FMT_YUV420P;
236 else if (strncmp("411", tokstart, 3)==0)
237 pix_fmt = PIX_FMT_YUV411P;
238 else if (strncmp("422", tokstart, 3)==0)
239 pix_fmt = PIX_FMT_YUV422P;
240 else if (strncmp("444alpha", tokstart, 8)==0) {
241 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
243 } else if (strncmp("444", tokstart, 3)==0)
244 pix_fmt = PIX_FMT_YUV444P;
245 else if (strncmp("mono",tokstart, 4)==0) {
246 pix_fmt = PIX_FMT_GRAY8;
248 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
251 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
253 case 'I': // Interlace type
254 switch (*tokstart++){
258 s1->interlaced_frame=0;
261 s1->interlaced_frame=1;
262 s1->top_field_first=1;
265 s1->interlaced_frame=1;
266 s1->top_field_first=0;
269 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
272 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
276 case 'F': // Frame rate
277 sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
278 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
280 case 'A': // Pixel aspect
281 sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
282 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
284 case 'X': // Vendor extensions
285 if (strncmp("YSCSS=",tokstart,6)==0) {
286 // Older nonstandard pixel format representation
288 if (strncmp("420JPEG",tokstart,7)==0)
289 alt_pix_fmt=PIX_FMT_YUV420P;
290 else if (strncmp("420MPEG2",tokstart,8)==0)
291 alt_pix_fmt=PIX_FMT_YUV420P;
292 else if (strncmp("420PALDV",tokstart,8)==0)
293 alt_pix_fmt=PIX_FMT_YUV420P;
294 else if (strncmp("411",tokstart,3)==0)
295 alt_pix_fmt=PIX_FMT_YUV411P;
296 else if (strncmp("422",tokstart,3)==0)
297 alt_pix_fmt=PIX_FMT_YUV422P;
298 else if (strncmp("444",tokstart,3)==0)
299 alt_pix_fmt=PIX_FMT_YUV444P;
301 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
306 if ((width == -1) || (height == -1)) {
307 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
311 if (pix_fmt == PIX_FMT_NONE) {
312 if (alt_pix_fmt == PIX_FMT_NONE)
313 pix_fmt = PIX_FMT_YUV420P;
315 pix_fmt = alt_pix_fmt;
318 if (raten == 0 && rated == 0) {
319 // Frame rate unknown
324 if (aspectn == 0 && aspectd == 0) {
325 // Pixel aspect unknown
329 st = av_new_stream(s, 0);
331 st->codec->width = width;
332 st->codec->height = height;
333 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
334 av_set_pts_info(st, 64, rated, raten);
335 st->codec->pix_fmt = pix_fmt;
336 st->codec->codec_type = CODEC_TYPE_VIDEO;
337 st->codec->codec_id = CODEC_ID_RAWVIDEO;
338 st->codec->sample_aspect_ratio= (AVRational){aspectn, aspectd};
343 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
346 char header[MAX_FRAME_HEADER+1];
347 int packet_size, width, height;
348 AVStream *st = s->streams[0];
349 struct frame_attributes *s1 = s->priv_data;
351 for (i=0; i<MAX_FRAME_HEADER; i++) {
352 header[i] = get_byte(&s->pb);
353 if (header[i] == '\n') {
358 if (i == MAX_FRAME_HEADER) return -1;
359 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
361 width = st->codec->width;
362 height = st->codec->height;
364 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
368 if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
371 if (s->streams[0]->codec->coded_frame) {
372 s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
373 s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
376 pkt->stream_index = 0;
380 static int yuv4_read_close(AVFormatContext *s)
385 static int yuv4_probe(AVProbeData *pd)
387 /* check file header */
388 if (pd->buf_size <= sizeof(Y4M_MAGIC))
390 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
391 return AVPROBE_SCORE_MAX;
396 AVInputFormat yuv4mpegpipe_iformat = {
398 "YUV4MPEG pipe format",
399 sizeof(struct frame_attributes),
407 int yuv4mpeg_init(void)
409 av_register_input_format(&yuv4mpegpipe_iformat);
411 av_register_output_format(&yuv4mpegpipe_oformat);
412 #endif //CONFIG_MUXERS