pnm.c 16 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/*
 * PNM image format
 * Copyright (c) 2002, 2003 Fabrice Bellard.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "avcodec.h"
Michael Niedermayer's avatar
Michael Niedermayer committed
20
#include "mpegvideo.h" //only for ParseContext
21 22 23 24 25 26 27 28

typedef struct PNMContext {
    uint8_t *bytestream;
    uint8_t *bytestream_start;
    uint8_t *bytestream_end;
    AVFrame picture;
} PNMContext;

29
static inline int pnm_space(int c)
30 31 32 33
{
    return (c == ' ' || c == '\n' || c == '\r' || c == '\t');
}

34
static void pnm_get(PNMContext *sc, char *str, int buf_size)
35 36 37
{
    char *s;
    int c;
38

39 40 41 42 43 44 45 46 47 48 49
    /* skip spaces and comments */
    for(;;) {
        c = *sc->bytestream++;
        if (c == '#')  {
            do  {
                c = *sc->bytestream++;
            } while (c != '\n' && sc->bytestream < sc->bytestream_end);
        } else if (!pnm_space(c)) {
            break;
        }
    }
50

51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
    s = str;
    while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
        if ((s - str)  < buf_size - 1)
            *s++ = c;
        c = *sc->bytestream++;
    }
    *s = '\0';
}

static int common_init(AVCodecContext *avctx){
    PNMContext *s = avctx->priv_data;

    avcodec_get_frame_defaults((AVFrame*)&s->picture);
    avctx->coded_frame= (AVFrame*)&s->picture;

    return 0;
}

Michael Niedermayer's avatar
Michael Niedermayer committed
69
static int pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
70 71
    char buf1[32], tuple_type[32];
    int h, w, depth, maxval;;
72 73 74 75 76

    pnm_get(s, buf1, sizeof(buf1));
    if (!strcmp(buf1, "P4")) {
        avctx->pix_fmt = PIX_FMT_MONOWHITE;
    } else if (!strcmp(buf1, "P5")) {
77
        if (avctx->codec_id == CODEC_ID_PGMYUV)
78 79 80 81 82
            avctx->pix_fmt = PIX_FMT_YUV420P;
        else
            avctx->pix_fmt = PIX_FMT_GRAY8;
    } else if (!strcmp(buf1, "P6")) {
        avctx->pix_fmt = PIX_FMT_RGB24;
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
    } else if (!strcmp(buf1, "P7")) {
        w = -1;
        h = -1;
        maxval = -1;
        depth = -1;
        tuple_type[0] = '\0';
        for(;;) {
            pnm_get(s, buf1, sizeof(buf1));
            if (!strcmp(buf1, "WIDTH")) {
                pnm_get(s, buf1, sizeof(buf1));
                w = strtol(buf1, NULL, 10);
            } else if (!strcmp(buf1, "HEIGHT")) {
                pnm_get(s, buf1, sizeof(buf1));
                h = strtol(buf1, NULL, 10);
            } else if (!strcmp(buf1, "DEPTH")) {
                pnm_get(s, buf1, sizeof(buf1));
                depth = strtol(buf1, NULL, 10);
            } else if (!strcmp(buf1, "MAXVAL")) {
                pnm_get(s, buf1, sizeof(buf1));
                maxval = strtol(buf1, NULL, 10);
            } else if (!strcmp(buf1, "TUPLETYPE")) {
                pnm_get(s, tuple_type, sizeof(tuple_type));
            } else if (!strcmp(buf1, "ENDHDR")) {
                break;
            } else {
                return -1;
            }
        }
        /* 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

115 116 117 118 119
        avctx->width = w;
        avctx->height = h;
        if (depth == 1) {
            if (maxval == 1)
                avctx->pix_fmt = PIX_FMT_MONOWHITE;
120
            else
121 122 123 124 125 126 127 128 129
                avctx->pix_fmt = PIX_FMT_GRAY8;
        } else if (depth == 3) {
            avctx->pix_fmt = PIX_FMT_RGB24;
        } else if (depth == 4) {
            avctx->pix_fmt = PIX_FMT_RGBA32;
        } else {
            return -1;
        }
        return 0;
130 131 132 133 134 135 136 137 138
    } else {
        return -1;
    }
    pnm_get(s, buf1, sizeof(buf1));
    avctx->width = atoi(buf1);
    if (avctx->width <= 0)
        return -1;
    pnm_get(s, buf1, sizeof(buf1));
    avctx->height = atoi(buf1);
139
    if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
        return -1;
    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
        pnm_get(s, buf1, sizeof(buf1));
    }

    /* more check if YUV420 */
    if (avctx->pix_fmt == PIX_FMT_YUV420P) {
        if ((avctx->width & 1) != 0)
            return -1;
        h = (avctx->height * 2);
        if ((h % 3) != 0)
            return -1;
        h /= 3;
        avctx->height = h;
    }
Michael Niedermayer's avatar
Michael Niedermayer committed
155 156 157
    return 0;
}

158
static int pnm_decode_frame(AVCodecContext *avctx,
Michael Niedermayer's avatar
Michael Niedermayer committed
159 160 161 162 163 164 165 166 167 168 169 170
                        void *data, int *data_size,
                        uint8_t *buf, int buf_size)
{
    PNMContext * const s = avctx->priv_data;
    AVFrame *picture = data;
    AVFrame * const p= (AVFrame*)&s->picture;
    int i, n, linesize, h;
    unsigned char *ptr;

    s->bytestream_start=
    s->bytestream= buf;
    s->bytestream_end= buf + buf_size;
171

Michael Niedermayer's avatar
Michael Niedermayer committed
172
    if(pnm_decode_header(avctx, s) < 0)
173
        return -1;
174

175 176 177 178 179 180 181 182 183 184
    if(p->data[0])
        avctx->release_buffer(avctx, p);

    p->reference= 0;
    if(avctx->get_buffer(avctx, p) < 0){
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return -1;
    }
    p->pict_type= FF_I_TYPE;
    p->key_frame= 1;
185

186 187 188 189 190 191 192 193 194 195
    switch(avctx->pix_fmt) {
    default:
        return -1;
    case PIX_FMT_RGB24:
        n = avctx->width * 3;
        goto do_read;
    case PIX_FMT_GRAY8:
        n = avctx->width;
        goto do_read;
    case PIX_FMT_MONOWHITE:
196
    case PIX_FMT_MONOBLACK:
197 198 199 200
        n = (avctx->width + 7) >> 3;
    do_read:
        ptr = p->data[0];
        linesize = p->linesize[0];
Michael Niedermayer's avatar
Michael Niedermayer committed
201 202
        if(s->bytestream + n*avctx->height > s->bytestream_end)
            return -1;
203 204 205 206 207 208 209 210 211 212 213 214 215
        for(i = 0; i < avctx->height; i++) {
            memcpy(ptr, s->bytestream, n);
            s->bytestream += n;
            ptr += linesize;
        }
        break;
    case PIX_FMT_YUV420P:
        {
            unsigned char *ptr1, *ptr2;

            n = avctx->width;
            ptr = p->data[0];
            linesize = p->linesize[0];
Michael Niedermayer's avatar
Michael Niedermayer committed
216 217
            if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
                return -1;
218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236
            for(i = 0; i < avctx->height; i++) {
                memcpy(ptr, s->bytestream, n);
                s->bytestream += n;
                ptr += linesize;
            }
            ptr1 = p->data[1];
            ptr2 = p->data[2];
            n >>= 1;
            h = avctx->height >> 1;
            for(i = 0; i < h; i++) {
                memcpy(ptr1, s->bytestream, n);
                s->bytestream += n;
                memcpy(ptr2, s->bytestream, n);
                s->bytestream += n;
                ptr1 += p->linesize[1];
                ptr2 += p->linesize[2];
            }
        }
        break;
237 238 239
    case PIX_FMT_RGBA32:
        ptr = p->data[0];
        linesize = p->linesize[0];
Michael Niedermayer's avatar
Michael Niedermayer committed
240 241
        if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
            return -1;
242 243 244 245 246 247 248 249 250 251 252 253 254
        for(i = 0; i < avctx->height; i++) {
            int j, r, g, b, a;

            for(j = 0;j < avctx->width; j++) {
                r = *s->bytestream++;
                g = *s->bytestream++;
                b = *s->bytestream++;
                a = *s->bytestream++;
                ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
            }
            ptr += linesize;
        }
        break;
255 256 257 258 259 260 261 262 263 264 265 266 267 268
    }
    *picture= *(AVFrame*)&s->picture;
    *data_size = sizeof(AVPicture);

    return s->bytestream - s->bytestream_start;
}

static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
    PNMContext *s = avctx->priv_data;
    AVFrame *pict = data;
    AVFrame * const p= (AVFrame*)&s->picture;
    int i, h, h1, c, n, linesize;
    uint8_t *ptr, *ptr1, *ptr2;

269 270 271 272 273
    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
        return -1;
    }

274 275 276
    *p = *pict;
    p->pict_type= FF_I_TYPE;
    p->key_frame= 1;
277

278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
    s->bytestream_start=
    s->bytestream= outbuf;
    s->bytestream_end= outbuf+buf_size;

    h = avctx->height;
    h1 = h;
    switch(avctx->pix_fmt) {
    case PIX_FMT_MONOWHITE:
        c = '4';
        n = (avctx->width + 7) >> 3;
        break;
    case PIX_FMT_GRAY8:
        c = '5';
        n = avctx->width;
        break;
    case PIX_FMT_RGB24:
        c = '6';
        n = avctx->width * 3;
        break;
    case PIX_FMT_YUV420P:
        c = '5';
        n = avctx->width;
        h1 = (h * 3) / 2;
        break;
    default:
        return -1;
    }
305
    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
306 307 308 309
             "P%c\n%d %d\n",
             c, avctx->width, h1);
    s->bytestream += strlen(s->bytestream);
    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
310
        snprintf(s->bytestream, s->bytestream_end - s->bytestream,
311 312 313 314 315 316 317 318 319 320 321
                 "%d\n", 255);
        s->bytestream += strlen(s->bytestream);
    }

    ptr = p->data[0];
    linesize = p->linesize[0];
    for(i=0;i<h;i++) {
        memcpy(s->bytestream, ptr, n);
        s->bytestream += n;
        ptr += linesize;
    }
322

323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347
    if (avctx->pix_fmt == PIX_FMT_YUV420P) {
        h >>= 1;
        n >>= 1;
        ptr1 = p->data[1];
        ptr2 = p->data[2];
        for(i=0;i<h;i++) {
            memcpy(s->bytestream, ptr1, n);
            s->bytestream += n;
            memcpy(s->bytestream, ptr2, n);
            s->bytestream += n;
                ptr1 += p->linesize[1];
                ptr2 += p->linesize[2];
        }
    }
    return s->bytestream - s->bytestream_start;
}

static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
    PNMContext *s = avctx->priv_data;
    AVFrame *pict = data;
    AVFrame * const p= (AVFrame*)&s->picture;
    int i, h, w, n, linesize, depth, maxval;
    const char *tuple_type;
    uint8_t *ptr;

348 349 350 351 352
    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
        return -1;
    }

353 354 355
    *p = *pict;
    p->pict_type= FF_I_TYPE;
    p->key_frame= 1;
356

357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390
    s->bytestream_start=
    s->bytestream= outbuf;
    s->bytestream_end= outbuf+buf_size;

    h = avctx->height;
    w = avctx->width;
    switch(avctx->pix_fmt) {
    case PIX_FMT_MONOWHITE:
        n = (w + 7) >> 3;
        depth = 1;
        maxval = 1;
        tuple_type = "BLACKANDWHITE";
        break;
    case PIX_FMT_GRAY8:
        n = w;
        depth = 1;
        maxval = 255;
        tuple_type = "GRAYSCALE";
        break;
    case PIX_FMT_RGB24:
        n = w * 3;
        depth = 3;
        maxval = 255;
        tuple_type = "RGB";
        break;
    case PIX_FMT_RGBA32:
        n = w * 4;
        depth = 4;
        maxval = 255;
        tuple_type = "RGB_ALPHA";
        break;
    default:
        return -1;
    }
391
    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
392 393 394
             "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
             w, h, depth, maxval, tuple_type);
    s->bytestream += strlen(s->bytestream);
395

396 397
    ptr = p->data[0];
    linesize = p->linesize[0];
398

399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
    if (avctx->pix_fmt == PIX_FMT_RGBA32) {
        int j;
        unsigned int v;

        for(i=0;i<h;i++) {
            for(j=0;j<w;j++) {
                v = ((uint32_t *)ptr)[j];
                *s->bytestream++ = v >> 16;
                *s->bytestream++ = v >> 8;
                *s->bytestream++ = v;
                *s->bytestream++ = v >> 24;
            }
            ptr += linesize;
        }
    } else {
        for(i=0;i<h;i++) {
            memcpy(s->bytestream, ptr, n);
            s->bytestream += n;
            ptr += linesize;
        }
    }
    return s->bytestream - s->bytestream_start;
}

#if 0
static int pnm_probe(AVProbeData *pd)
{
    const char *p = pd->buf;
    if (pd->buf_size >= 8 &&
        p[0] == 'P' &&
        p[1] >= '4' && p[1] <= '6' &&
        pnm_space(p[2]) )
        return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
    else
        return 0;
}

static int pgmyuv_probe(AVProbeData *pd)
{
    if (match_ext(pd->filename, "pgmyuv"))
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

static int pam_probe(AVProbeData *pd)
{
    const char *p = pd->buf;
    if (pd->buf_size >= 8 &&
        p[0] == 'P' &&
        p[1] == '7' &&
        p[2] == '\n')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}
#endif

Michael Niedermayer's avatar
Michael Niedermayer committed
457 458
static int pnm_parse(AVCodecParserContext *s,
                           AVCodecContext *avctx,
459
                           uint8_t **poutbuf, int *poutbuf_size,
Michael Niedermayer's avatar
Michael Niedermayer committed
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475
                           const uint8_t *buf, int buf_size)
{
    ParseContext *pc = s->priv_data;
    PNMContext pnmctx;
    int next;

    for(; pc->overread>0; pc->overread--){
        pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
    }
retry:
    if(pc->index){
        pnmctx.bytestream_start=
        pnmctx.bytestream= pc->buffer;
        pnmctx.bytestream_end= pc->buffer + pc->index;
    }else{
        pnmctx.bytestream_start=
476 477
        pnmctx.bytestream= (uint8_t *) buf; /* casts avoid warnings */
        pnmctx.bytestream_end= (uint8_t *) buf + buf_size;
Michael Niedermayer's avatar
Michael Niedermayer committed
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
    }
    if(pnm_decode_header(avctx, &pnmctx) < 0){
        if(pnmctx.bytestream < pnmctx.bytestream_end){
            if(pc->index){
                pc->index=0;
            }else{
                buf++;
                buf_size--;
            }
            goto retry;
        }
#if 0
        if(pc->index && pc->index*2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index){
            memcpy(pc->buffer + pc->index, buf, pc->index);
            pc->index += pc->index;
            buf += pc->index;
            buf_size -= pc->index;
            goto retry;
        }
#endif
        next= END_NOT_FOUND;
    }else{
500
        next= pnmctx.bytestream - pnmctx.bytestream_start
Michael Niedermayer's avatar
Michael Niedermayer committed
501 502 503 504 505 506
            + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
        if(pnmctx.bytestream_start!=buf)
            next-= pc->index;
        if(next > buf_size)
            next= END_NOT_FOUND;
    }
507

Michael Niedermayer's avatar
Michael Niedermayer committed
508 509 510 511 512 513 514 515 516 517 518
    if(ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size)<0){
        *poutbuf = NULL;
        *poutbuf_size = 0;
        return buf_size;
    }
    *poutbuf = (uint8_t *)buf;
    *poutbuf_size = buf_size;
    return next;
}

AVCodecParser pnm_parser = {
519
    { CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
Michael Niedermayer's avatar
Michael Niedermayer committed
520 521 522 523 524 525
    sizeof(ParseContext),
    NULL,
    pnm_parse,
    ff_parse_close,
};

526
#ifdef CONFIG_PGM_ENCODER
527 528 529 530 531 532 533 534 535
AVCodec pgm_encoder = {
    "pgm",
    CODEC_TYPE_VIDEO,
    CODEC_ID_PGM,
    sizeof(PNMContext),
    common_init,
    pnm_encode_frame,
    NULL, //encode_end,
    pnm_decode_frame,
536
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, -1},
537
};
538
#endif // CONFIG_PGM_ENCODER
539

540
#ifdef CONFIG_PGMYUV_ENCODER
541 542 543 544 545 546 547 548 549
AVCodec pgmyuv_encoder = {
    "pgmyuv",
    CODEC_TYPE_VIDEO,
    CODEC_ID_PGMYUV,
    sizeof(PNMContext),
    common_init,
    pnm_encode_frame,
    NULL, //encode_end,
    pnm_decode_frame,
550
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
551
};
552
#endif // CONFIG_PGMYUV_ENCODER
553

554
#ifdef CONFIG_PPM_ENCODER
555 556 557 558 559 560 561 562 563
AVCodec ppm_encoder = {
    "ppm",
    CODEC_TYPE_VIDEO,
    CODEC_ID_PPM,
    sizeof(PNMContext),
    common_init,
    pnm_encode_frame,
    NULL, //encode_end,
    pnm_decode_frame,
564
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
565
};
566
#endif // CONFIG_PPM_ENCODER
567

568
#ifdef CONFIG_PBM_ENCODER
569 570 571 572 573 574 575 576 577
AVCodec pbm_encoder = {
    "pbm",
    CODEC_TYPE_VIDEO,
    CODEC_ID_PBM,
    sizeof(PNMContext),
    common_init,
    pnm_encode_frame,
    NULL, //encode_end,
    pnm_decode_frame,
578
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
579
};
580
#endif // CONFIG_PBM_ENCODER
581

582
#ifdef CONFIG_PAM_ENCODER
583 584 585 586 587 588 589 590
AVCodec pam_encoder = {
    "pam",
    CODEC_TYPE_VIDEO,
    CODEC_ID_PAM,
    sizeof(PNMContext),
    common_init,
    pam_encode_frame,
    NULL, //encode_end,
591
    pnm_decode_frame,
592
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
593
};
594
#endif // CONFIG_PAM_ENCODER