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 {
30 static int yuv4_generate_header(AVFormatContext *s, char* buf)
34 int raten, rated, aspectn, aspectd, n;
36 const char *colorspace = "";
39 width = st->codec->width;
40 height = st->codec->height;
42 av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
44 aspectn = st->codec->sample_aspect_ratio.num;
45 aspectd = st->codec->sample_aspect_ratio.den;
47 if ( aspectn == 0 && aspectd == 1 ) aspectd = 0; // 0:0 means unknown
49 inter = 'p'; /* progressive is the default */
50 if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
51 inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
54 switch(st->codec->pix_fmt) {
56 colorspace = " Cmono";
59 colorspace = " C411 XYSCSS=411";
62 colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
65 colorspace = " C422 XYSCSS=422";
68 colorspace = " C444 XYSCSS=444";
72 /* construct stream header, if this is the first frame */
73 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
85 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
87 AVStream *st = s->streams[pkt->stream_index];
88 ByteIOContext *pb = &s->pb;
90 int* first_pkt = s->priv_data;
91 int width, height, h_chroma_shift, v_chroma_shift;
93 char buf2[Y4M_LINE_MAX+1];
95 uint8_t *ptr, *ptr1, *ptr2;
97 picture = (AVPicture *)pkt->data;
99 /* for the first packet we have to output the header as well */
102 if (yuv4_generate_header(s, buf2) < 0) {
103 av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
106 put_buffer(pb, buf2, strlen(buf2));
110 /* construct frame header */
112 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
113 put_buffer(pb, buf1, strlen(buf1));
115 width = st->codec->width;
116 height = st->codec->height;
118 ptr = picture->data[0];
119 for(i=0;i<height;i++) {
120 put_buffer(pb, ptr, width);
121 ptr += picture->linesize[0];
124 if (st->codec->pix_fmt != PIX_FMT_GRAY8){
125 // Adjust for smaller Cb and Cr planes
126 avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
127 width >>= h_chroma_shift;
128 height >>= v_chroma_shift;
130 ptr1 = picture->data[1];
131 ptr2 = picture->data[2];
132 for(i=0;i<height;i++) { /* Cb */
133 put_buffer(pb, ptr1, width);
134 ptr1 += picture->linesize[1];
136 for(i=0;i<height;i++) { /* Cr */
137 put_buffer(pb, ptr2, width);
138 ptr2 += picture->linesize[2];
141 put_flush_packet(pb);
145 static int yuv4_write_header(AVFormatContext *s)
147 int* first_pkt = s->priv_data;
149 if (s->nb_streams != 1)
152 if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
153 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
155 else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
156 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
157 (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
158 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
159 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");
167 static int yuv4_write_trailer(AVFormatContext *s)
172 #ifdef CONFIG_YUV4MPEGPIPE_MUXER
173 AVOutputFormat yuv4mpegpipe_muxer = {
175 "YUV4MPEG pipe format",
184 .flags = AVFMT_RAWPICTURE,
188 /* Header size increased to allow room for optional flags */
189 #define MAX_YUV4_HEADER 80
190 #define MAX_FRAME_HEADER 80
192 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
194 char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option
195 char *tokstart,*tokend,*header_end;
197 ByteIOContext *pb = &s->pb;
198 int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
199 enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
201 struct frame_attributes *s1 = s->priv_data;
203 for (i=0; i<MAX_YUV4_HEADER; i++) {
204 header[i] = get_byte(pb);
205 if (header[i] == '\n') {
206 header[i+1] = 0x20; // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
211 if (i == MAX_YUV4_HEADER) return -1;
212 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
214 s1->interlaced_frame = 0;
215 s1->top_field_first = 0;
216 header_end = &header[i+1]; // Include space
217 for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
218 if (*tokstart==0x20) continue;
219 switch (*tokstart++) {
220 case 'W': // Width. Required.
221 width = strtol(tokstart, &tokend, 10);
224 case 'H': // Height. Required.
225 height = strtol(tokstart, &tokend, 10);
228 case 'C': // Color space
229 if (strncmp("420jpeg",tokstart,7)==0)
230 pix_fmt = PIX_FMT_YUV420P;
231 else if (strncmp("420mpeg2",tokstart,8)==0)
232 pix_fmt = PIX_FMT_YUV420P;
233 else if (strncmp("420paldv", tokstart, 8)==0)
234 pix_fmt = PIX_FMT_YUV420P;
235 else if (strncmp("411", tokstart, 3)==0)
236 pix_fmt = PIX_FMT_YUV411P;
237 else if (strncmp("422", tokstart, 3)==0)
238 pix_fmt = PIX_FMT_YUV422P;
239 else if (strncmp("444alpha", tokstart, 8)==0) {
240 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
242 } else if (strncmp("444", tokstart, 3)==0)
243 pix_fmt = PIX_FMT_YUV444P;
244 else if (strncmp("mono",tokstart, 4)==0) {
245 pix_fmt = PIX_FMT_GRAY8;
247 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
250 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
252 case 'I': // Interlace type
253 switch (*tokstart++){
257 s1->interlaced_frame=0;
260 s1->interlaced_frame=1;
261 s1->top_field_first=1;
264 s1->interlaced_frame=1;
265 s1->top_field_first=0;
268 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
271 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
275 case 'F': // Frame rate
276 sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
277 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
279 case 'A': // Pixel aspect
280 sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
281 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
283 case 'X': // Vendor extensions
284 if (strncmp("YSCSS=",tokstart,6)==0) {
285 // Older nonstandard pixel format representation
287 if (strncmp("420JPEG",tokstart,7)==0)
288 alt_pix_fmt=PIX_FMT_YUV420P;
289 else if (strncmp("420MPEG2",tokstart,8)==0)
290 alt_pix_fmt=PIX_FMT_YUV420P;
291 else if (strncmp("420PALDV",tokstart,8)==0)
292 alt_pix_fmt=PIX_FMT_YUV420P;
293 else if (strncmp("411",tokstart,3)==0)
294 alt_pix_fmt=PIX_FMT_YUV411P;
295 else if (strncmp("422",tokstart,3)==0)
296 alt_pix_fmt=PIX_FMT_YUV422P;
297 else if (strncmp("444",tokstart,3)==0)
298 alt_pix_fmt=PIX_FMT_YUV444P;
300 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
305 if ((width == -1) || (height == -1)) {
306 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
310 if (pix_fmt == PIX_FMT_NONE) {
311 if (alt_pix_fmt == PIX_FMT_NONE)
312 pix_fmt = PIX_FMT_YUV420P;
314 pix_fmt = alt_pix_fmt;
317 if (raten == 0 && rated == 0) {
318 // Frame rate unknown
323 if (aspectn == 0 && aspectd == 0) {
324 // Pixel aspect unknown
328 st = av_new_stream(s, 0);
330 st->codec->width = width;
331 st->codec->height = height;
332 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
333 av_set_pts_info(st, 64, rated, raten);
334 st->codec->pix_fmt = pix_fmt;
335 st->codec->codec_type = CODEC_TYPE_VIDEO;
336 st->codec->codec_id = CODEC_ID_RAWVIDEO;
337 st->codec->sample_aspect_ratio= (AVRational){aspectn, aspectd};
342 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
345 char header[MAX_FRAME_HEADER+1];
346 int packet_size, width, height;
347 AVStream *st = s->streams[0];
348 struct frame_attributes *s1 = s->priv_data;
350 for (i=0; i<MAX_FRAME_HEADER; i++) {
351 header[i] = get_byte(&s->pb);
352 if (header[i] == '\n') {
357 if (i == MAX_FRAME_HEADER) return -1;
358 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
360 width = st->codec->width;
361 height = st->codec->height;
363 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
367 if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
370 if (s->streams[0]->codec->coded_frame) {
371 s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
372 s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
375 pkt->stream_index = 0;
379 static int yuv4_read_close(AVFormatContext *s)
384 static int yuv4_probe(AVProbeData *pd)
386 /* check file header */
387 if (pd->buf_size <= sizeof(Y4M_MAGIC))
389 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
390 return AVPROBE_SCORE_MAX;
395 #ifdef CONFIG_YUV4MPEGPIPE_DEMUXER
396 AVInputFormat yuv4mpegpipe_demuxer = {
398 "YUV4MPEG pipe format",
399 sizeof(struct frame_attributes),