ENOMEM is better, yes ...
[libav.git] / libavformat / yuv4mpeg.c
1 /*
2 * YUV4MPEG format
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21 #include "avformat.h"
22
23 #define Y4M_MAGIC "YUV4MPEG2"
24 #define Y4M_FRAME_MAGIC "FRAME"
25 #define Y4M_LINE_MAX 256
26
27 struct frame_attributes {
28 int interlaced_frame;
29 int top_field_first;
30 };
31
32 static int yuv4_generate_header(AVFormatContext *s, char* buf)
33 {
34 AVStream *st;
35 int width, height;
36 int raten, rated, aspectn, aspectd, n;
37 char inter;
38 const char *colorspace = "";
39
40 st = s->streams[0];
41 width = st->codec->width;
42 height = st->codec->height;
43
44 av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
45
46 aspectn = st->codec->sample_aspect_ratio.num;
47 aspectd = st->codec->sample_aspect_ratio.den;
48
49 if ( aspectn == 0 && aspectd == 1 ) aspectd = 0; // 0:0 means unknown
50
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';
54 }
55
56 switch(st->codec->pix_fmt) {
57 case PIX_FMT_GRAY8:
58 colorspace = " Cmono";
59 break;
60 case PIX_FMT_YUV411P:
61 colorspace = " C411 XYSCSS=411";
62 break;
63 case PIX_FMT_YUV420P:
64 colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
65 break;
66 case PIX_FMT_YUV422P:
67 colorspace = " C422 XYSCSS=422";
68 break;
69 case PIX_FMT_YUV444P:
70 colorspace = " C444 XYSCSS=444";
71 break;
72 }
73
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",
76 Y4M_MAGIC,
77 width,
78 height,
79 raten, rated,
80 inter,
81 aspectn, aspectd,
82 colorspace);
83
84 return n;
85 }
86
87 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
88 {
89 AVStream *st = s->streams[pkt->stream_index];
90 ByteIOContext *pb = s->pb;
91 AVPicture *picture;
92 int* first_pkt = s->priv_data;
93 int width, height, h_chroma_shift, v_chroma_shift;
94 int i, m;
95 char buf2[Y4M_LINE_MAX+1];
96 char buf1[20];
97 uint8_t *ptr, *ptr1, *ptr2;
98
99 picture = (AVPicture *)pkt->data;
100
101 /* for the first packet we have to output the header as well */
102 if (*first_pkt) {
103 *first_pkt = 0;
104 if (yuv4_generate_header(s, buf2) < 0) {
105 av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
106 return AVERROR(EIO);
107 } else {
108 put_buffer(pb, buf2, strlen(buf2));
109 }
110 }
111
112 /* construct frame header */
113
114 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
115 put_buffer(pb, buf1, strlen(buf1));
116
117 width = st->codec->width;
118 height = st->codec->height;
119
120 ptr = picture->data[0];
121 for(i=0;i<height;i++) {
122 put_buffer(pb, ptr, width);
123 ptr += picture->linesize[0];
124 }
125
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;
131
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];
137 }
138 for(i=0;i<height;i++) { /* Cr */
139 put_buffer(pb, ptr2, width);
140 ptr2 += picture->linesize[2];
141 }
142 }
143 put_flush_packet(pb);
144 return 0;
145 }
146
147 static int yuv4_write_header(AVFormatContext *s)
148 {
149 int* first_pkt = s->priv_data;
150
151 if (s->nb_streams != 1)
152 return AVERROR(EIO);
153
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");
156 }
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");
162 return AVERROR(EIO);
163 }
164
165 *first_pkt = 1;
166 return 0;
167 }
168
169 #ifdef CONFIG_YUV4MPEGPIPE_MUXER
170 AVOutputFormat yuv4mpegpipe_muxer = {
171 "yuv4mpegpipe",
172 "YUV4MPEG pipe format",
173 "",
174 "y4m",
175 sizeof(int),
176 CODEC_ID_NONE,
177 CODEC_ID_RAWVIDEO,
178 yuv4_write_header,
179 yuv4_write_packet,
180 .flags = AVFMT_RAWPICTURE,
181 };
182 #endif
183
184 /* Header size increased to allow room for optional flags */
185 #define MAX_YUV4_HEADER 80
186 #define MAX_FRAME_HEADER 80
187
188 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
189 {
190 char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option
191 char *tokstart,*tokend,*header_end;
192 int i;
193 ByteIOContext *pb = s->pb;
194 int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
195 enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
196 AVStream *st;
197 struct frame_attributes *s1 = s->priv_data;
198
199 for (i=0; i<MAX_YUV4_HEADER; i++) {
200 header[i] = get_byte(pb);
201 if (header[i] == '\n') {
202 header[i+1] = 0x20; // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
203 header[i+2] = 0;
204 break;
205 }
206 }
207 if (i == MAX_YUV4_HEADER) return -1;
208 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
209
210 s1->interlaced_frame = 0;
211 s1->top_field_first = 0;
212 header_end = &header[i+1]; // Include space
213 for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
214 if (*tokstart==0x20) continue;
215 switch (*tokstart++) {
216 case 'W': // Width. Required.
217 width = strtol(tokstart, &tokend, 10);
218 tokstart=tokend;
219 break;
220 case 'H': // Height. Required.
221 height = strtol(tokstart, &tokend, 10);
222 tokstart=tokend;
223 break;
224 case 'C': // Color space
225 if (strncmp("420jpeg",tokstart,7)==0)
226 pix_fmt = PIX_FMT_YUV420P;
227 else if (strncmp("420mpeg2",tokstart,8)==0)
228 pix_fmt = PIX_FMT_YUV420P;
229 else if (strncmp("420paldv", tokstart, 8)==0)
230 pix_fmt = PIX_FMT_YUV420P;
231 else if (strncmp("411", tokstart, 3)==0)
232 pix_fmt = PIX_FMT_YUV411P;
233 else if (strncmp("422", tokstart, 3)==0)
234 pix_fmt = PIX_FMT_YUV422P;
235 else if (strncmp("444alpha", tokstart, 8)==0) {
236 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
237 return -1;
238 } else if (strncmp("444", tokstart, 3)==0)
239 pix_fmt = PIX_FMT_YUV444P;
240 else if (strncmp("mono",tokstart, 4)==0) {
241 pix_fmt = PIX_FMT_GRAY8;
242 } else {
243 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
244 return -1;
245 }
246 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
247 break;
248 case 'I': // Interlace type
249 switch (*tokstart++){
250 case '?':
251 break;
252 case 'p':
253 s1->interlaced_frame=0;
254 break;
255 case 't':
256 s1->interlaced_frame=1;
257 s1->top_field_first=1;
258 break;
259 case 'b':
260 s1->interlaced_frame=1;
261 s1->top_field_first=0;
262 break;
263 case 'm':
264 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
265 return -1;
266 default:
267 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
268 return -1;
269 }
270 break;
271 case 'F': // Frame rate
272 sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
273 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
274 break;
275 case 'A': // Pixel aspect
276 sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
277 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
278 break;
279 case 'X': // Vendor extensions
280 if (strncmp("YSCSS=",tokstart,6)==0) {
281 // Older nonstandard pixel format representation
282 tokstart+=6;
283 if (strncmp("420JPEG",tokstart,7)==0)
284 alt_pix_fmt=PIX_FMT_YUV420P;
285 else if (strncmp("420MPEG2",tokstart,8)==0)
286 alt_pix_fmt=PIX_FMT_YUV420P;
287 else if (strncmp("420PALDV",tokstart,8)==0)
288 alt_pix_fmt=PIX_FMT_YUV420P;
289 else if (strncmp("411",tokstart,3)==0)
290 alt_pix_fmt=PIX_FMT_YUV411P;
291 else if (strncmp("422",tokstart,3)==0)
292 alt_pix_fmt=PIX_FMT_YUV422P;
293 else if (strncmp("444",tokstart,3)==0)
294 alt_pix_fmt=PIX_FMT_YUV444P;
295 }
296 while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
297 break;
298 }
299 }
300
301 if ((width == -1) || (height == -1)) {
302 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
303 return -1;
304 }
305
306 if (pix_fmt == PIX_FMT_NONE) {
307 if (alt_pix_fmt == PIX_FMT_NONE)
308 pix_fmt = PIX_FMT_YUV420P;
309 else
310 pix_fmt = alt_pix_fmt;
311 }
312
313 if (raten == 0 && rated == 0) {
314 // Frame rate unknown
315 raten = 25;
316 rated = 1;
317 }
318
319 if (aspectn == 0 && aspectd == 0) {
320 // Pixel aspect unknown
321 aspectd = 1;
322 }
323
324 st = av_new_stream(s, 0);
325 if(!st)
326 return AVERROR(ENOMEM);
327 st->codec->width = width;
328 st->codec->height = height;
329 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
330 av_set_pts_info(st, 64, rated, raten);
331 st->codec->pix_fmt = pix_fmt;
332 st->codec->codec_type = CODEC_TYPE_VIDEO;
333 st->codec->codec_id = CODEC_ID_RAWVIDEO;
334 st->codec->sample_aspect_ratio= (AVRational){aspectn, aspectd};
335
336 return 0;
337 }
338
339 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
340 {
341 int i;
342 char header[MAX_FRAME_HEADER+1];
343 int packet_size, width, height;
344 AVStream *st = s->streams[0];
345 struct frame_attributes *s1 = s->priv_data;
346
347 for (i=0; i<MAX_FRAME_HEADER; i++) {
348 header[i] = get_byte(s->pb);
349 if (header[i] == '\n') {
350 header[i+1] = 0;
351 break;
352 }
353 }
354 if (i == MAX_FRAME_HEADER) return -1;
355 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
356
357 width = st->codec->width;
358 height = st->codec->height;
359
360 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
361 if (packet_size < 0)
362 return -1;
363
364 if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
365 return AVERROR(EIO);
366
367 if (s->streams[0]->codec->coded_frame) {
368 s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
369 s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
370 }
371
372 pkt->stream_index = 0;
373 return 0;
374 }
375
376 static int yuv4_read_close(AVFormatContext *s)
377 {
378 return 0;
379 }
380
381 static int yuv4_probe(AVProbeData *pd)
382 {
383 /* check file header */
384 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
385 return AVPROBE_SCORE_MAX;
386 else
387 return 0;
388 }
389
390 #ifdef CONFIG_YUV4MPEGPIPE_DEMUXER
391 AVInputFormat yuv4mpegpipe_demuxer = {
392 "yuv4mpegpipe",
393 "YUV4MPEG pipe format",
394 sizeof(struct frame_attributes),
395 yuv4_probe,
396 yuv4_read_header,
397 yuv4_read_packet,
398 yuv4_read_close,
399 .extensions = "y4m"
400 };
401 #endif