3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define Y4M_MAGIC "YUV4MPEG2"
24 #define Y4M_FRAME_MAGIC "FRAME"
25 #define Y4M_LINE_MAX 256
27 struct frame_attributes {
32 static int yuv4_generate_header(AVFormatContext *s, char* buf)
36 int raten, rated, aspectn, aspectd, n;
38 const 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 #ifdef CONFIG_YUV4MPEGPIPE_MUXER
175 AVOutputFormat yuv4mpegpipe_muxer = {
177 "YUV4MPEG pipe format",
186 .flags = AVFMT_RAWPICTURE,
190 /* Header size increased to allow room for optional flags */
191 #define MAX_YUV4_HEADER 80
192 #define MAX_FRAME_HEADER 80
194 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
196 char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option
197 char *tokstart,*tokend,*header_end;
199 ByteIOContext *pb = &s->pb;
200 int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
201 enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
203 struct frame_attributes *s1 = s->priv_data;
205 for (i=0; i<MAX_YUV4_HEADER; i++) {
206 header[i] = get_byte(pb);
207 if (header[i] == '\n') {
208 header[i+1] = 0x20; // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
213 if (i == MAX_YUV4_HEADER) return -1;
214 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
216 s1->interlaced_frame = 0;
217 s1->top_field_first = 0;
218 header_end = &header[i+1]; // Include space
219 for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
220 if (*tokstart==0x20) continue;
221 switch (*tokstart++) {
222 case 'W': // Width. Required.
223 width = strtol(tokstart, &tokend, 10);
226 case 'H': // Height. Required.
227 height = strtol(tokstart, &tokend, 10);
230 case 'C': // Color space
231 if (strncmp("420jpeg",tokstart,7)==0)
232 pix_fmt = PIX_FMT_YUV420P;
233 else if (strncmp("420mpeg2",tokstart,8)==0)
234 pix_fmt = PIX_FMT_YUV420P;
235 else if (strncmp("420paldv", tokstart, 8)==0)
236 pix_fmt = PIX_FMT_YUV420P;
237 else if (strncmp("411", tokstart, 3)==0)
238 pix_fmt = PIX_FMT_YUV411P;
239 else if (strncmp("422", tokstart, 3)==0)
240 pix_fmt = PIX_FMT_YUV422P;
241 else if (strncmp("444alpha", tokstart, 8)==0) {
242 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
244 } else if (strncmp("444", tokstart, 3)==0)
245 pix_fmt = PIX_FMT_YUV444P;
246 else if (strncmp("mono",tokstart, 4)==0) {
247 pix_fmt = PIX_FMT_GRAY8;
249 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
252 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
254 case 'I': // Interlace type
255 switch (*tokstart++){
259 s1->interlaced_frame=0;
262 s1->interlaced_frame=1;
263 s1->top_field_first=1;
266 s1->interlaced_frame=1;
267 s1->top_field_first=0;
270 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
273 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
277 case 'F': // Frame rate
278 sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
279 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
281 case 'A': // Pixel aspect
282 sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
283 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
285 case 'X': // Vendor extensions
286 if (strncmp("YSCSS=",tokstart,6)==0) {
287 // Older nonstandard pixel format representation
289 if (strncmp("420JPEG",tokstart,7)==0)
290 alt_pix_fmt=PIX_FMT_YUV420P;
291 else if (strncmp("420MPEG2",tokstart,8)==0)
292 alt_pix_fmt=PIX_FMT_YUV420P;
293 else if (strncmp("420PALDV",tokstart,8)==0)
294 alt_pix_fmt=PIX_FMT_YUV420P;
295 else if (strncmp("411",tokstart,3)==0)
296 alt_pix_fmt=PIX_FMT_YUV411P;
297 else if (strncmp("422",tokstart,3)==0)
298 alt_pix_fmt=PIX_FMT_YUV422P;
299 else if (strncmp("444",tokstart,3)==0)
300 alt_pix_fmt=PIX_FMT_YUV444P;
302 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
307 if ((width == -1) || (height == -1)) {
308 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
312 if (pix_fmt == PIX_FMT_NONE) {
313 if (alt_pix_fmt == PIX_FMT_NONE)
314 pix_fmt = PIX_FMT_YUV420P;
316 pix_fmt = alt_pix_fmt;
319 if (raten == 0 && rated == 0) {
320 // Frame rate unknown
325 if (aspectn == 0 && aspectd == 0) {
326 // Pixel aspect unknown
330 st = av_new_stream(s, 0);
332 st->codec->width = width;
333 st->codec->height = height;
334 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
335 av_set_pts_info(st, 64, rated, raten);
336 st->codec->pix_fmt = pix_fmt;
337 st->codec->codec_type = CODEC_TYPE_VIDEO;
338 st->codec->codec_id = CODEC_ID_RAWVIDEO;
339 st->codec->sample_aspect_ratio= (AVRational){aspectn, aspectd};
344 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
347 char header[MAX_FRAME_HEADER+1];
348 int packet_size, width, height;
349 AVStream *st = s->streams[0];
350 struct frame_attributes *s1 = s->priv_data;
352 for (i=0; i<MAX_FRAME_HEADER; i++) {
353 header[i] = get_byte(&s->pb);
354 if (header[i] == '\n') {
359 if (i == MAX_FRAME_HEADER) return -1;
360 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
362 width = st->codec->width;
363 height = st->codec->height;
365 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
369 if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
372 if (s->streams[0]->codec->coded_frame) {
373 s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
374 s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
377 pkt->stream_index = 0;
381 static int yuv4_read_close(AVFormatContext *s)
386 static int yuv4_probe(AVProbeData *pd)
388 /* check file header */
389 if (pd->buf_size <= sizeof(Y4M_MAGIC))
391 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
392 return AVPROBE_SCORE_MAX;
397 #ifdef CONFIG_YUV4MPEGPIPE_DEMUXER
398 AVInputFormat yuv4mpegpipe_demuxer = {
400 "YUV4MPEG pipe format",
401 sizeof(struct frame_attributes),