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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/pnm.c@ 10184

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ffmpeg: exported to OSE
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1/*
2 * PNM image format
3 * Copyright (c) 2002, 2003 Fabrice Bellard.
4 *
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.
9 *
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.
14 *
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
18 */
19#include "avcodec.h"
20#include "mpegvideo.h" //only for ParseContext
21
22typedef struct PNMContext {
23 uint8_t *bytestream;
24 uint8_t *bytestream_start;
25 uint8_t *bytestream_end;
26 AVFrame picture;
27} PNMContext;
28
29static inline int pnm_space(int c)
30{
31 return (c == ' ' || c == '\n' || c == '\r' || c == '\t');
32}
33
34static void pnm_get(PNMContext *sc, char *str, int buf_size)
35{
36 char *s;
37 int c;
38
39 /* skip spaces and comments */
40 for(;;) {
41 c = *sc->bytestream++;
42 if (c == '#') {
43 do {
44 c = *sc->bytestream++;
45 } while (c != '\n' && sc->bytestream < sc->bytestream_end);
46 } else if (!pnm_space(c)) {
47 break;
48 }
49 }
50
51 s = str;
52 while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
53 if ((s - str) < buf_size - 1)
54 *s++ = c;
55 c = *sc->bytestream++;
56 }
57 *s = '\0';
58}
59
60static int common_init(AVCodecContext *avctx){
61 PNMContext *s = avctx->priv_data;
62
63 avcodec_get_frame_defaults((AVFrame*)&s->picture);
64 avctx->coded_frame= (AVFrame*)&s->picture;
65
66 return 0;
67}
68
69static int pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
70 char buf1[32], tuple_type[32];
71 int h, w, depth, maxval;;
72
73 pnm_get(s, buf1, sizeof(buf1));
74 if (!strcmp(buf1, "P4")) {
75 avctx->pix_fmt = PIX_FMT_MONOWHITE;
76 } else if (!strcmp(buf1, "P5")) {
77 if (avctx->codec_id == CODEC_ID_PGMYUV)
78 avctx->pix_fmt = PIX_FMT_YUV420P;
79 else
80 avctx->pix_fmt = PIX_FMT_GRAY8;
81 } else if (!strcmp(buf1, "P6")) {
82 avctx->pix_fmt = PIX_FMT_RGB24;
83 } else if (!strcmp(buf1, "P7")) {
84 w = -1;
85 h = -1;
86 maxval = -1;
87 depth = -1;
88 tuple_type[0] = '\0';
89 for(;;) {
90 pnm_get(s, buf1, sizeof(buf1));
91 if (!strcmp(buf1, "WIDTH")) {
92 pnm_get(s, buf1, sizeof(buf1));
93 w = strtol(buf1, NULL, 10);
94 } else if (!strcmp(buf1, "HEIGHT")) {
95 pnm_get(s, buf1, sizeof(buf1));
96 h = strtol(buf1, NULL, 10);
97 } else if (!strcmp(buf1, "DEPTH")) {
98 pnm_get(s, buf1, sizeof(buf1));
99 depth = strtol(buf1, NULL, 10);
100 } else if (!strcmp(buf1, "MAXVAL")) {
101 pnm_get(s, buf1, sizeof(buf1));
102 maxval = strtol(buf1, NULL, 10);
103 } else if (!strcmp(buf1, "TUPLETYPE")) {
104 pnm_get(s, tuple_type, sizeof(tuple_type));
105 } else if (!strcmp(buf1, "ENDHDR")) {
106 break;
107 } else {
108 return -1;
109 }
110 }
111 /* check that all tags are present */
112 if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || avcodec_check_dimensions(avctx, w, h))
113 return -1;
114
115 avctx->width = w;
116 avctx->height = h;
117 if (depth == 1) {
118 if (maxval == 1)
119 avctx->pix_fmt = PIX_FMT_MONOWHITE;
120 else
121 avctx->pix_fmt = PIX_FMT_GRAY8;
122 } else if (depth == 3) {
123 avctx->pix_fmt = PIX_FMT_RGB24;
124 } else if (depth == 4) {
125 avctx->pix_fmt = PIX_FMT_RGBA32;
126 } else {
127 return -1;
128 }
129 return 0;
130 } else {
131 return -1;
132 }
133 pnm_get(s, buf1, sizeof(buf1));
134 avctx->width = atoi(buf1);
135 if (avctx->width <= 0)
136 return -1;
137 pnm_get(s, buf1, sizeof(buf1));
138 avctx->height = atoi(buf1);
139 if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
140 return -1;
141 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
142 pnm_get(s, buf1, sizeof(buf1));
143 }
144
145 /* more check if YUV420 */
146 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
147 if ((avctx->width & 1) != 0)
148 return -1;
149 h = (avctx->height * 2);
150 if ((h % 3) != 0)
151 return -1;
152 h /= 3;
153 avctx->height = h;
154 }
155 return 0;
156}
157
158static int pnm_decode_frame(AVCodecContext *avctx,
159 void *data, int *data_size,
160 uint8_t *buf, int buf_size)
161{
162 PNMContext * const s = avctx->priv_data;
163 AVFrame *picture = data;
164 AVFrame * const p= (AVFrame*)&s->picture;
165 int i, n, linesize, h;
166 unsigned char *ptr;
167
168 s->bytestream_start=
169 s->bytestream= buf;
170 s->bytestream_end= buf + buf_size;
171
172 if(pnm_decode_header(avctx, s) < 0)
173 return -1;
174
175 if(p->data[0])
176 avctx->release_buffer(avctx, p);
177
178 p->reference= 0;
179 if(avctx->get_buffer(avctx, p) < 0){
180 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
181 return -1;
182 }
183 p->pict_type= FF_I_TYPE;
184 p->key_frame= 1;
185
186 switch(avctx->pix_fmt) {
187 default:
188 return -1;
189 case PIX_FMT_RGB24:
190 n = avctx->width * 3;
191 goto do_read;
192 case PIX_FMT_GRAY8:
193 n = avctx->width;
194 goto do_read;
195 case PIX_FMT_MONOWHITE:
196 case PIX_FMT_MONOBLACK:
197 n = (avctx->width + 7) >> 3;
198 do_read:
199 ptr = p->data[0];
200 linesize = p->linesize[0];
201 if(s->bytestream + n*avctx->height > s->bytestream_end)
202 return -1;
203 for(i = 0; i < avctx->height; i++) {
204 memcpy(ptr, s->bytestream, n);
205 s->bytestream += n;
206 ptr += linesize;
207 }
208 break;
209 case PIX_FMT_YUV420P:
210 {
211 unsigned char *ptr1, *ptr2;
212
213 n = avctx->width;
214 ptr = p->data[0];
215 linesize = p->linesize[0];
216 if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
217 return -1;
218 for(i = 0; i < avctx->height; i++) {
219 memcpy(ptr, s->bytestream, n);
220 s->bytestream += n;
221 ptr += linesize;
222 }
223 ptr1 = p->data[1];
224 ptr2 = p->data[2];
225 n >>= 1;
226 h = avctx->height >> 1;
227 for(i = 0; i < h; i++) {
228 memcpy(ptr1, s->bytestream, n);
229 s->bytestream += n;
230 memcpy(ptr2, s->bytestream, n);
231 s->bytestream += n;
232 ptr1 += p->linesize[1];
233 ptr2 += p->linesize[2];
234 }
235 }
236 break;
237 case PIX_FMT_RGBA32:
238 ptr = p->data[0];
239 linesize = p->linesize[0];
240 if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
241 return -1;
242 for(i = 0; i < avctx->height; i++) {
243 int j, r, g, b, a;
244
245 for(j = 0;j < avctx->width; j++) {
246 r = *s->bytestream++;
247 g = *s->bytestream++;
248 b = *s->bytestream++;
249 a = *s->bytestream++;
250 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
251 }
252 ptr += linesize;
253 }
254 break;
255 }
256 *picture= *(AVFrame*)&s->picture;
257 *data_size = sizeof(AVPicture);
258
259 return s->bytestream - s->bytestream_start;
260}
261
262static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
263 PNMContext *s = avctx->priv_data;
264 AVFrame *pict = data;
265 AVFrame * const p= (AVFrame*)&s->picture;
266 int i, h, h1, c, n, linesize;
267 uint8_t *ptr, *ptr1, *ptr2;
268
269 if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
270 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
271 return -1;
272 }
273
274 *p = *pict;
275 p->pict_type= FF_I_TYPE;
276 p->key_frame= 1;
277
278 s->bytestream_start=
279 s->bytestream= outbuf;
280 s->bytestream_end= outbuf+buf_size;
281
282 h = avctx->height;
283 h1 = h;
284 switch(avctx->pix_fmt) {
285 case PIX_FMT_MONOWHITE:
286 c = '4';
287 n = (avctx->width + 7) >> 3;
288 break;
289 case PIX_FMT_GRAY8:
290 c = '5';
291 n = avctx->width;
292 break;
293 case PIX_FMT_RGB24:
294 c = '6';
295 n = avctx->width * 3;
296 break;
297 case PIX_FMT_YUV420P:
298 c = '5';
299 n = avctx->width;
300 h1 = (h * 3) / 2;
301 break;
302 default:
303 return -1;
304 }
305 snprintf(s->bytestream, s->bytestream_end - s->bytestream,
306 "P%c\n%d %d\n",
307 c, avctx->width, h1);
308 s->bytestream += strlen(s->bytestream);
309 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
310 snprintf(s->bytestream, s->bytestream_end - s->bytestream,
311 "%d\n", 255);
312 s->bytestream += strlen(s->bytestream);
313 }
314
315 ptr = p->data[0];
316 linesize = p->linesize[0];
317 for(i=0;i<h;i++) {
318 memcpy(s->bytestream, ptr, n);
319 s->bytestream += n;
320 ptr += linesize;
321 }
322
323 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
324 h >>= 1;
325 n >>= 1;
326 ptr1 = p->data[1];
327 ptr2 = p->data[2];
328 for(i=0;i<h;i++) {
329 memcpy(s->bytestream, ptr1, n);
330 s->bytestream += n;
331 memcpy(s->bytestream, ptr2, n);
332 s->bytestream += n;
333 ptr1 += p->linesize[1];
334 ptr2 += p->linesize[2];
335 }
336 }
337 return s->bytestream - s->bytestream_start;
338}
339
340static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
341 PNMContext *s = avctx->priv_data;
342 AVFrame *pict = data;
343 AVFrame * const p= (AVFrame*)&s->picture;
344 int i, h, w, n, linesize, depth, maxval;
345 const char *tuple_type;
346 uint8_t *ptr;
347
348 if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
349 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
350 return -1;
351 }
352
353 *p = *pict;
354 p->pict_type= FF_I_TYPE;
355 p->key_frame= 1;
356
357 s->bytestream_start=
358 s->bytestream= outbuf;
359 s->bytestream_end= outbuf+buf_size;
360
361 h = avctx->height;
362 w = avctx->width;
363 switch(avctx->pix_fmt) {
364 case PIX_FMT_MONOWHITE:
365 n = (w + 7) >> 3;
366 depth = 1;
367 maxval = 1;
368 tuple_type = "BLACKANDWHITE";
369 break;
370 case PIX_FMT_GRAY8:
371 n = w;
372 depth = 1;
373 maxval = 255;
374 tuple_type = "GRAYSCALE";
375 break;
376 case PIX_FMT_RGB24:
377 n = w * 3;
378 depth = 3;
379 maxval = 255;
380 tuple_type = "RGB";
381 break;
382 case PIX_FMT_RGBA32:
383 n = w * 4;
384 depth = 4;
385 maxval = 255;
386 tuple_type = "RGB_ALPHA";
387 break;
388 default:
389 return -1;
390 }
391 snprintf(s->bytestream, s->bytestream_end - s->bytestream,
392 "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
393 w, h, depth, maxval, tuple_type);
394 s->bytestream += strlen(s->bytestream);
395
396 ptr = p->data[0];
397 linesize = p->linesize[0];
398
399 if (avctx->pix_fmt == PIX_FMT_RGBA32) {
400 int j;
401 unsigned int v;
402
403 for(i=0;i<h;i++) {
404 for(j=0;j<w;j++) {
405 v = ((uint32_t *)ptr)[j];
406 *s->bytestream++ = v >> 16;
407 *s->bytestream++ = v >> 8;
408 *s->bytestream++ = v;
409 *s->bytestream++ = v >> 24;
410 }
411 ptr += linesize;
412 }
413 } else {
414 for(i=0;i<h;i++) {
415 memcpy(s->bytestream, ptr, n);
416 s->bytestream += n;
417 ptr += linesize;
418 }
419 }
420 return s->bytestream - s->bytestream_start;
421}
422
423#if 0
424static int pnm_probe(AVProbeData *pd)
425{
426 const char *p = pd->buf;
427 if (pd->buf_size >= 8 &&
428 p[0] == 'P' &&
429 p[1] >= '4' && p[1] <= '6' &&
430 pnm_space(p[2]) )
431 return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
432 else
433 return 0;
434}
435
436static int pgmyuv_probe(AVProbeData *pd)
437{
438 if (match_ext(pd->filename, "pgmyuv"))
439 return AVPROBE_SCORE_MAX;
440 else
441 return 0;
442}
443
444static int pam_probe(AVProbeData *pd)
445{
446 const char *p = pd->buf;
447 if (pd->buf_size >= 8 &&
448 p[0] == 'P' &&
449 p[1] == '7' &&
450 p[2] == '\n')
451 return AVPROBE_SCORE_MAX;
452 else
453 return 0;
454}
455#endif
456
457#ifdef CONFIG_PNM_PARSER
458static int pnm_parse(AVCodecParserContext *s,
459 AVCodecContext *avctx,
460 uint8_t **poutbuf, int *poutbuf_size,
461 const uint8_t *buf, int buf_size)
462{
463 ParseContext *pc = s->priv_data;
464 PNMContext pnmctx;
465 int next;
466
467 for(; pc->overread>0; pc->overread--){
468 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
469 }
470retry:
471 if(pc->index){
472 pnmctx.bytestream_start=
473 pnmctx.bytestream= pc->buffer;
474 pnmctx.bytestream_end= pc->buffer + pc->index;
475 }else{
476 pnmctx.bytestream_start=
477 pnmctx.bytestream= (uint8_t *) buf; /* casts avoid warnings */
478 pnmctx.bytestream_end= (uint8_t *) buf + buf_size;
479 }
480 if(pnm_decode_header(avctx, &pnmctx) < 0){
481 if(pnmctx.bytestream < pnmctx.bytestream_end){
482 if(pc->index){
483 pc->index=0;
484 }else{
485 buf++;
486 buf_size--;
487 }
488 goto retry;
489 }
490#if 0
491 if(pc->index && pc->index*2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index){
492 memcpy(pc->buffer + pc->index, buf, pc->index);
493 pc->index += pc->index;
494 buf += pc->index;
495 buf_size -= pc->index;
496 goto retry;
497 }
498#endif
499 next= END_NOT_FOUND;
500 }else{
501 next= pnmctx.bytestream - pnmctx.bytestream_start
502 + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
503 if(pnmctx.bytestream_start!=buf)
504 next-= pc->index;
505 if(next > buf_size)
506 next= END_NOT_FOUND;
507 }
508
509 if(ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size)<0){
510 *poutbuf = NULL;
511 *poutbuf_size = 0;
512 return buf_size;
513 }
514 *poutbuf = (uint8_t *)buf;
515 *poutbuf_size = buf_size;
516 return next;
517}
518
519AVCodecParser pnm_parser = {
520 { CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
521 sizeof(ParseContext),
522 NULL,
523 pnm_parse,
524 ff_parse_close,
525};
526#endif /* CONFIG_PNM_PARSER */
527
528#ifdef CONFIG_PGM_ENCODER
529AVCodec pgm_encoder = {
530 "pgm",
531 CODEC_TYPE_VIDEO,
532 CODEC_ID_PGM,
533 sizeof(PNMContext),
534 common_init,
535 pnm_encode_frame,
536 NULL, //encode_end,
537 pnm_decode_frame,
538 .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, -1},
539};
540#endif // CONFIG_PGM_ENCODER
541
542#ifdef CONFIG_PGMYUV_ENCODER
543AVCodec pgmyuv_encoder = {
544 "pgmyuv",
545 CODEC_TYPE_VIDEO,
546 CODEC_ID_PGMYUV,
547 sizeof(PNMContext),
548 common_init,
549 pnm_encode_frame,
550 NULL, //encode_end,
551 pnm_decode_frame,
552 .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
553};
554#endif // CONFIG_PGMYUV_ENCODER
555
556#ifdef CONFIG_PPM_ENCODER
557AVCodec ppm_encoder = {
558 "ppm",
559 CODEC_TYPE_VIDEO,
560 CODEC_ID_PPM,
561 sizeof(PNMContext),
562 common_init,
563 pnm_encode_frame,
564 NULL, //encode_end,
565 pnm_decode_frame,
566 .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
567};
568#endif // CONFIG_PPM_ENCODER
569
570#ifdef CONFIG_PBM_ENCODER
571AVCodec pbm_encoder = {
572 "pbm",
573 CODEC_TYPE_VIDEO,
574 CODEC_ID_PBM,
575 sizeof(PNMContext),
576 common_init,
577 pnm_encode_frame,
578 NULL, //encode_end,
579 pnm_decode_frame,
580 .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
581};
582#endif // CONFIG_PBM_ENCODER
583
584#ifdef CONFIG_PAM_ENCODER
585AVCodec pam_encoder = {
586 "pam",
587 CODEC_TYPE_VIDEO,
588 CODEC_ID_PAM,
589 sizeof(PNMContext),
590 common_init,
591 pam_encode_frame,
592 NULL, //encode_end,
593 pnm_decode_frame,
594 .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
595};
596#endif // CONFIG_PAM_ENCODER
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