libavcodec/pnmdec.c

   1 /*
   2  * PNM image format
   3  * Copyright (c) 2002, 2003 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avcodec.h"
  23 #include "bytestream.h"
  24 #include "internal.h"
  25 #include "put_bits.h"
  26 #include "pnm.h"
  27
  28
  29 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
  30                             int *got_frame, AVPacket *avpkt)
  31 {
  32     const uint8_t *buf   = avpkt->data;
  33     int buf_size         = avpkt->size;
  34     PNMContext * const s = avctx->priv_data;
  35     AVFrame *picture     = data;
  36     AVFrame * const p    = &s->picture;
  37     int i, j, n, linesize, h, upgrade = 0;
  38     unsigned char *ptr;
  39     int components, sample_len, ret;
  40
  41     s->bytestream_start =
  42     s->bytestream       = buf;
  43     s->bytestream_end   = buf + buf_size;
  44
  45     if ((ret = ff_pnm_decode_header(avctx, s)) < 0)
  46         return ret;
  47
  48     if (p->data[0])
  49         avctx->release_buffer(avctx, p);
  50
  51     p->reference = 0;
  52     if ((ret = ff_get_buffer(avctx, p)) < 0) {
  53         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  54         return ret;
  55     }
  56     p->pict_type = AV_PICTURE_TYPE_I;
  57     p->key_frame = 1;
  58
  59     switch (avctx->pix_fmt) {
  60     default:
  61         return AVERROR(EINVAL);
  62     case AV_PIX_FMT_RGB48BE:
  63         n = avctx->width * 6;
  64         components=3;
  65         sample_len=16;
  66         goto do_read;
  67     case AV_PIX_FMT_RGB24:
  68         n = avctx->width * 3;
  69         components=3;
  70         sample_len=8;
  71         goto do_read;
  72     case AV_PIX_FMT_GRAY8:
  73         n = avctx->width;
  74         components=1;
  75         sample_len=8;
  76         if (s->maxval < 255)
  77             upgrade = 1;
  78         goto do_read;
  79     case AV_PIX_FMT_GRAY16BE:
  80     case AV_PIX_FMT_GRAY16LE:
  81         n = avctx->width * 2;
  82         components=1;
  83         sample_len=16;
  84         if (s->maxval < 65535)
  85             upgrade = 2;
  86         goto do_read;
  87     case AV_PIX_FMT_MONOWHITE:
  88     case AV_PIX_FMT_MONOBLACK:
  89         n = (avctx->width + 7) >> 3;
  90         components=1;
  91         sample_len=1;
  92     do_read:
  93         ptr      = p->data[0];
  94         linesize = p->linesize[0];
  95         if (s->bytestream + n * avctx->height > s->bytestream_end)
  96             return AVERROR_INVALIDDATA;
  97         if(s->type < 4){
  98             for (i=0; i<avctx->height; i++) {
  99                 PutBitContext pb;
 100                 init_put_bits(&pb, ptr, linesize);
 101                 for(j=0; j<avctx->width * components; j++){
 102                     unsigned int c=0;
 103                     int v=0;
 104                     while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
 105                         s->bytestream++;
 106                     if(s->bytestream >= s->bytestream_end)
 107                         return AVERROR_INVALIDDATA;
 108                     do{
 109                         v= 10*v + c;
 110                         c= (*s->bytestream++) - '0';
 111                     }while(c <= 9);
 112                     put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
 113                 }
 114                 flush_put_bits(&pb);
 115                 ptr+= linesize;
 116             }
 117         }else{
 118         for (i = 0; i < avctx->height; i++) {
 119             if (!upgrade)
 120                 memcpy(ptr, s->bytestream, n);
 121             else if (upgrade == 1) {
 122                 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
 123                 for (j = 0; j < n; j++)
 124                     ptr[j] = (s->bytestream[j] * f + 64) >> 7;
 125             } else if (upgrade == 2) {
 126                 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
 127                 for (j = 0; j < n / 2; j++) {
 128                     v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
 129                     ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
 130                 }
 131             }
 132             s->bytestream += n;
 133             ptr           += linesize;
 134         }
 135         }
 136         break;
 137     case AV_PIX_FMT_YUV420P:
 138     case AV_PIX_FMT_YUV420P9BE:
 139     case AV_PIX_FMT_YUV420P10BE:
 140         {
 141             unsigned char *ptr1, *ptr2;
 142
 143             n        = avctx->width;
 144             ptr      = p->data[0];
 145             linesize = p->linesize[0];
 146             if (s->maxval >= 256)
 147                 n *= 2;
 148             if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
 149                 return AVERROR_INVALIDDATA;
 150             for (i = 0; i < avctx->height; i++) {
 151                 memcpy(ptr, s->bytestream, n);
 152                 s->bytestream += n;
 153                 ptr           += linesize;
 154             }
 155             ptr1 = p->data[1];
 156             ptr2 = p->data[2];
 157             n >>= 1;
 158             h = avctx->height >> 1;
 159             for (i = 0; i < h; i++) {
 160                 memcpy(ptr1, s->bytestream, n);
 161                 s->bytestream += n;
 162                 memcpy(ptr2, s->bytestream, n);
 163                 s->bytestream += n;
 164                 ptr1 += p->linesize[1];
 165                 ptr2 += p->linesize[2];
 166             }
 167         }
 168         break;
 169     case AV_PIX_FMT_YUV420P16:
 170         {
 171             uint16_t *ptr1, *ptr2;
 172             const int f = (65535 * 32768 + s->maxval / 2) / s->maxval;
 173             unsigned int j, v;
 174
 175             n        = avctx->width * 2;
 176             ptr      = p->data[0];
 177             linesize = p->linesize[0];
 178             if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
 179                 return AVERROR_INVALIDDATA;
 180             for (i = 0; i < avctx->height; i++) {
 181                 for (j = 0; j < n / 2; j++) {
 182                     v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
 183                     ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
 184                 }
 185                 s->bytestream += n;
 186                 ptr           += linesize;
 187             }
 188             ptr1 = (uint16_t*)p->data[1];
 189             ptr2 = (uint16_t*)p->data[2];
 190             n >>= 1;
 191             h = avctx->height >> 1;
 192             for (i = 0; i < h; i++) {
 193                 for (j = 0; j < n / 2; j++) {
 194                     v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
 195                     ptr1[j] = (v * f + 16384) >> 15;
 196                 }
 197                 s->bytestream += n;
 198
 199                 for (j = 0; j < n / 2; j++) {
 200                     v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
 201                     ptr2[j] = (v * f + 16384) >> 15;
 202                 }
 203                 s->bytestream += n;
 204
 205                 ptr1 += p->linesize[1] / 2;
 206                 ptr2 += p->linesize[2] / 2;
 207             }
 208         }
 209         break;
 210     case AV_PIX_FMT_RGB32:
 211         ptr      = p->data[0];
 212         linesize = p->linesize[0];
 213         if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
 214             return AVERROR_INVALIDDATA;
 215         for (i = 0; i < avctx->height; i++) {
 216             int j, r, g, b, a;
 217
 218             for (j = 0; j < avctx->width; j++) {
 219                 r = *s->bytestream++;
 220                 g = *s->bytestream++;
 221                 b = *s->bytestream++;
 222                 a = *s->bytestream++;
 223                 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
 224             }
 225             ptr += linesize;
 226         }
 227         break;
 228     }
 229     *picture   = s->picture;
 230     *got_frame = 1;
 231
 232     return s->bytestream - s->bytestream_start;
 233 }
 234
 235
 236 #if CONFIG_PGM_DECODER
 237 AVCodec ff_pgm_decoder = {
 238     .name           = "pgm",
 239     .type           = AVMEDIA_TYPE_VIDEO,
 240     .id             = AV_CODEC_ID_PGM,
 241     .priv_data_size = sizeof(PNMContext),
 242     .init           = ff_pnm_init,
 243     .close          = ff_pnm_end,
 244     .decode         = pnm_decode_frame,
 245     .capabilities   = CODEC_CAP_DR1,
 246     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
 247 };
 248 #endif
 249
 250 #if CONFIG_PGMYUV_DECODER
 251 AVCodec ff_pgmyuv_decoder = {
 252     .name           = "pgmyuv",
 253     .type           = AVMEDIA_TYPE_VIDEO,
 254     .id             = AV_CODEC_ID_PGMYUV,
 255     .priv_data_size = sizeof(PNMContext),
 256     .init           = ff_pnm_init,
 257     .close          = ff_pnm_end,
 258     .decode         = pnm_decode_frame,
 259     .capabilities   = CODEC_CAP_DR1,
 260     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
 261 };
 262 #endif
 263
 264 #if CONFIG_PPM_DECODER
 265 AVCodec ff_ppm_decoder = {
 266     .name           = "ppm",
 267     .type           = AVMEDIA_TYPE_VIDEO,
 268     .id             = AV_CODEC_ID_PPM,
 269     .priv_data_size = sizeof(PNMContext),
 270     .init           = ff_pnm_init,
 271     .close          = ff_pnm_end,
 272     .decode         = pnm_decode_frame,
 273     .capabilities   = CODEC_CAP_DR1,
 274     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
 275 };
 276 #endif
 277
 278 #if CONFIG_PBM_DECODER
 279 AVCodec ff_pbm_decoder = {
 280     .name           = "pbm",
 281     .type           = AVMEDIA_TYPE_VIDEO,
 282     .id             = AV_CODEC_ID_PBM,
 283     .priv_data_size = sizeof(PNMContext),
 284     .init           = ff_pnm_init,
 285     .close          = ff_pnm_end,
 286     .decode         = pnm_decode_frame,
 287     .capabilities   = CODEC_CAP_DR1,
 288     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
 289 };
 290 #endif
 291
 292 #if CONFIG_PAM_DECODER
 293 AVCodec ff_pam_decoder = {
 294     .name           = "pam",
 295     .type           = AVMEDIA_TYPE_VIDEO,
 296     .id             = AV_CODEC_ID_PAM,
 297     .priv_data_size = sizeof(PNMContext),
 298     .init           = ff_pnm_init,
 299     .close          = ff_pnm_end,
 300     .decode         = pnm_decode_frame,
 301     .capabilities   = CODEC_CAP_DR1,
 302     .long_name      = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
 303 };
 304 #endif