3 * Copyright (c) 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
20 #include "mpegvideo.h" //only for ParseContext
22 typedef struct PNMContext {
24 uint8_t *bytestream_start;
25 uint8_t *bytestream_end;
29 static inline int pnm_space(int c)
31 return (c == ' ' || c == '\n' || c == '\r' || c == '\t');
34 static void pnm_get(PNMContext *sc, char *str, int buf_size)
39 /* skip spaces and comments */
41 c = *sc->bytestream++;
44 c = *sc->bytestream++;
45 } while (c != '\n' && sc->bytestream < sc->bytestream_end);
46 } else if (!pnm_space(c)) {
52 while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
53 if ((s - str) < buf_size - 1)
55 c = *sc->bytestream++;
60 static int common_init(AVCodecContext *avctx){
61 PNMContext *s = avctx->priv_data;
63 avcodec_get_frame_defaults((AVFrame*)&s->picture);
64 avctx->coded_frame= (AVFrame*)&s->picture;
69 static int pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
70 char buf1[32], tuple_type[32];
71 int h, w, depth, maxval;;
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;
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")) {
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")) {
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))
119 avctx->pix_fmt = PIX_FMT_MONOWHITE;
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;
133 pnm_get(s, buf1, sizeof(buf1));
134 avctx->width = atoi(buf1);
135 if (avctx->width <= 0)
137 pnm_get(s, buf1, sizeof(buf1));
138 avctx->height = atoi(buf1);
139 if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
141 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
142 pnm_get(s, buf1, sizeof(buf1));
145 /* more check if YUV420 */
146 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
147 if ((avctx->width & 1) != 0)
149 h = (avctx->height * 2);
158 static int pnm_decode_frame(AVCodecContext *avctx,
159 void *data, int *data_size,
160 uint8_t *buf, int buf_size)
162 PNMContext * const s = avctx->priv_data;
163 AVFrame *picture = data;
164 AVFrame * const p= (AVFrame*)&s->picture;
165 int i, n, linesize, h;
170 s->bytestream_end= buf + buf_size;
172 if(pnm_decode_header(avctx, s) < 0)
176 avctx->release_buffer(avctx, p);
179 if(avctx->get_buffer(avctx, p) < 0){
180 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
183 p->pict_type= FF_I_TYPE;
186 switch(avctx->pix_fmt) {
190 n = avctx->width * 3;
195 case PIX_FMT_MONOWHITE:
196 case PIX_FMT_MONOBLACK:
197 n = (avctx->width + 7) >> 3;
200 linesize = p->linesize[0];
201 if(s->bytestream + n*avctx->height > s->bytestream_end)
203 for(i = 0; i < avctx->height; i++) {
204 memcpy(ptr, s->bytestream, n);
209 case PIX_FMT_YUV420P:
211 unsigned char *ptr1, *ptr2;
215 linesize = p->linesize[0];
216 if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
218 for(i = 0; i < avctx->height; i++) {
219 memcpy(ptr, s->bytestream, n);
226 h = avctx->height >> 1;
227 for(i = 0; i < h; i++) {
228 memcpy(ptr1, s->bytestream, n);
230 memcpy(ptr2, s->bytestream, n);
232 ptr1 += p->linesize[1];
233 ptr2 += p->linesize[2];
239 linesize = p->linesize[0];
240 if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
242 for(i = 0; i < avctx->height; i++) {
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;
256 *picture= *(AVFrame*)&s->picture;
257 *data_size = sizeof(AVPicture);
259 return s->bytestream - s->bytestream_start;
262 static 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;
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");
275 p->pict_type= FF_I_TYPE;
279 s->bytestream= outbuf;
280 s->bytestream_end= outbuf+buf_size;
284 switch(avctx->pix_fmt) {
285 case PIX_FMT_MONOWHITE:
287 n = (avctx->width + 7) >> 3;
295 n = avctx->width * 3;
297 case PIX_FMT_YUV420P:
305 snprintf(s->bytestream, s->bytestream_end - s->bytestream,
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,
312 s->bytestream += strlen(s->bytestream);
316 linesize = p->linesize[0];
318 memcpy(s->bytestream, ptr, n);
323 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
329 memcpy(s->bytestream, ptr1, n);
331 memcpy(s->bytestream, ptr2, n);
333 ptr1 += p->linesize[1];
334 ptr2 += p->linesize[2];
337 return s->bytestream - s->bytestream_start;
340 static 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;
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");
354 p->pict_type= FF_I_TYPE;
358 s->bytestream= outbuf;
359 s->bytestream_end= outbuf+buf_size;
363 switch(avctx->pix_fmt) {
364 case PIX_FMT_MONOWHITE:
368 tuple_type = "BLACKANDWHITE";
374 tuple_type = "GRAYSCALE";
386 tuple_type = "RGB_ALPHA";
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);
397 linesize = p->linesize[0];
399 if (avctx->pix_fmt == PIX_FMT_RGBA32) {
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;
415 memcpy(s->bytestream, ptr, n);
420 return s->bytestream - s->bytestream_start;
424 static int pnm_probe(AVProbeData *pd)
426 const char *p = pd->buf;
427 if (pd->buf_size >= 8 &&
429 p[1] >= '4' && p[1] <= '6' &&
431 return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
436 static int pgmyuv_probe(AVProbeData *pd)
438 if (match_ext(pd->filename, "pgmyuv"))
439 return AVPROBE_SCORE_MAX;
444 static int pam_probe(AVProbeData *pd)
446 const char *p = pd->buf;
447 if (pd->buf_size >= 8 &&
451 return AVPROBE_SCORE_MAX;
457 #ifdef CONFIG_PNM_PARSER
458 static int pnm_parse(AVCodecParserContext *s,
459 AVCodecContext *avctx,
460 uint8_t **poutbuf, int *poutbuf_size,
461 const uint8_t *buf, int buf_size)
463 ParseContext *pc = s->priv_data;
467 for(; pc->overread>0; pc->overread--){
468 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
472 pnmctx.bytestream_start=
473 pnmctx.bytestream= pc->buffer;
474 pnmctx.bytestream_end= pc->buffer + pc->index;
476 pnmctx.bytestream_start=
477 pnmctx.bytestream= (uint8_t *) buf; /* casts avoid warnings */
478 pnmctx.bytestream_end= (uint8_t *) buf + buf_size;
480 if(pnm_decode_header(avctx, &pnmctx) < 0){
481 if(pnmctx.bytestream < pnmctx.bytestream_end){
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;
495 buf_size -= pc->index;
501 next= pnmctx.bytestream - pnmctx.bytestream_start
502 + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
503 if(pnmctx.bytestream_start!=buf)
509 if(ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size)<0){
514 *poutbuf = (uint8_t *)buf;
515 *poutbuf_size = buf_size;
519 AVCodecParser pnm_parser = {
520 { CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
521 sizeof(ParseContext),
526 #endif /* CONFIG_PNM_PARSER */
528 #ifdef CONFIG_PGM_ENCODER
529 AVCodec pgm_encoder = {
538 .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, -1},
540 #endif // CONFIG_PGM_ENCODER
542 #ifdef CONFIG_PGMYUV_ENCODER
543 AVCodec pgmyuv_encoder = {
552 .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
554 #endif // CONFIG_PGMYUV_ENCODER
556 #ifdef CONFIG_PPM_ENCODER
557 AVCodec ppm_encoder = {
566 .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
568 #endif // CONFIG_PPM_ENCODER
570 #ifdef CONFIG_PBM_ENCODER
571 AVCodec pbm_encoder = {
580 .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
582 #endif // CONFIG_PBM_ENCODER
584 #ifdef CONFIG_PAM_ENCODER
585 AVCodec pam_encoder = {
594 .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
596 #endif // CONFIG_PAM_ENCODER