libavcodec/pnmdec.c

   1 /*
   2  * PNM image format
   3  * Copyright (c) 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
  22 #include "avcodec.h"
  23 #include "bytestream.h"
  24 #include "put_bits.h"
  25 #include "pnm.h"
  26
  27
  28 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
  29                             int *data_size, AVPacket *avpkt)
  30 {
  31     const uint8_t *buf   = avpkt->data;
  32     int buf_size         = avpkt->size;
  33     PNMContext * const s = avctx->priv_data;
  34     AVFrame *picture     = data;
  35     AVFrame * const p    = (AVFrame*)&s->picture;
  36     int i, j, n, linesize, h, upgrade = 0;
  37     unsigned char *ptr;
  38     int components, sample_len;
  39
  40     s->bytestream_start =
  41     s->bytestream       = buf;
  42     s->bytestream_end   = buf + buf_size;
  43
  44     if (ff_pnm_decode_header(avctx, s) < 0)
  45         return -1;
  46
  47     if (p->data[0])
  48         avctx->release_buffer(avctx, p);
  49
  50     p->reference = 0;
  51     if (avctx->get_buffer(avctx, p) < 0) {
  52         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  53         return -1;
  54     }
  55     p->pict_type = FF_I_TYPE;
  56     p->key_frame = 1;
  57
  58     switch (avctx->pix_fmt) {
  59     default:
  60         return -1;
  61     case PIX_FMT_RGB48BE:
  62         n = avctx->width * 6;
  63         components=3;
  64         sample_len=16;
  65         goto do_read;
  66     case PIX_FMT_RGB24:
  67         n = avctx->width * 3;
  68         components=3;
  69         sample_len=8;
  70         goto do_read;
  71     case PIX_FMT_GRAY8:
  72         n = avctx->width;
  73         components=1;
  74         sample_len=8;
  75         if (s->maxval < 255)
  76             upgrade = 1;
  77         goto do_read;
  78     case PIX_FMT_GRAY16BE:
  79     case PIX_FMT_GRAY16LE:
  80         n = avctx->width * 2;
  81         components=1;
  82         sample_len=16;
  83         if (s->maxval < 65535)
  84             upgrade = 2;
  85         goto do_read;
  86     case PIX_FMT_MONOWHITE:
  87     case PIX_FMT_MONOBLACK:
  88         n = (avctx->width + 7) >> 3;
  89         components=1;
  90         sample_len=1;
  91     do_read:
  92         ptr      = p->data[0];
  93         linesize = p->linesize[0];
  94         if (s->bytestream + n * avctx->height > s->bytestream_end)
  95             return -1;
  96         if(s->type < 4){
  97             for (i=0; i<avctx->height; i++) {
  98                 PutBitContext pb;
  99                 init_put_bits(&pb, ptr, linesize);
 100                 for(j=0; j<avctx->width * components; j++){
 101                     unsigned int c=0;
 102                     int v=0;
 103                     while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
 104                         s->bytestream++;
 105                     if(s->bytestream >= s->bytestream_end)
 106                         return -1;
 107                     do{
 108                         v= 10*v + c;
 109                         c= (*s->bytestream++) - '0';
 110                     }while(c <= 9);
 111                     put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
 112                 }
 113                 flush_put_bits(&pb);
 114                 ptr+= linesize;
 115             }
 116         }else{
 117         for (i = 0; i < avctx->height; i++) {
 118             if (!upgrade)
 119                 memcpy(ptr, s->bytestream, n);
 120             else if (upgrade == 1) {
 121                 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
 122                 for (j = 0; j < n; j++)
 123                     ptr[j] = (s->bytestream[j] * f + 64) >> 7;
 124             } else if (upgrade == 2) {
 125                 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
 126                 for (j = 0; j < n / 2; j++) {
 127                     v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
 128                     ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
 129                 }
 130             }
 131             s->bytestream += n;
 132             ptr           += linesize;
 133         }
 134         }
 135         break;
 136     case PIX_FMT_YUV420P:
 137         {
 138             unsigned char *ptr1, *ptr2;
 139
 140             n        = avctx->width;
 141             ptr      = p->data[0];
 142             linesize = p->linesize[0];
 143             if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
 144                 return -1;
 145             for (i = 0; i < avctx->height; i++) {
 146                 memcpy(ptr, s->bytestream, n);
 147                 s->bytestream += n;
 148                 ptr           += linesize;
 149             }
 150             ptr1 = p->data[1];
 151             ptr2 = p->data[2];
 152             n >>= 1;
 153             h = avctx->height >> 1;
 154             for (i = 0; i < h; i++) {
 155                 memcpy(ptr1, s->bytestream, n);
 156                 s->bytestream += n;
 157                 memcpy(ptr2, s->bytestream, n);
 158                 s->bytestream += n;
 159                 ptr1 += p->linesize[1];
 160                 ptr2 += p->linesize[2];
 161             }
 162         }
 163         break;
 164     case PIX_FMT_RGB32:
 165         ptr      = p->data[0];
 166         linesize = p->linesize[0];
 167         if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
 168             return -1;
 169         for (i = 0; i < avctx->height; i++) {
 170             int j, r, g, b, a;
 171
 172             for (j = 0; j < avctx->width; j++) {
 173                 r = *s->bytestream++;
 174                 g = *s->bytestream++;
 175                 b = *s->bytestream++;
 176                 a = *s->bytestream++;
 177                 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
 178             }
 179             ptr += linesize;
 180         }
 181         break;
 182     }
 183     *picture   = *(AVFrame*)&s->picture;
 184     *data_size = sizeof(AVPicture);
 185
 186     return s->bytestream - s->bytestream_start;
 187 }
 188
 189
 190 #if CONFIG_PGM_DECODER
 191 AVCodec ff_pgm_decoder = {
 192     "pgm",
 193     AVMEDIA_TYPE_VIDEO,
 194     CODEC_ID_PGM,
 195     sizeof(PNMContext),
 196     ff_pnm_init,
 197     NULL,
 198     ff_pnm_end,
 199     pnm_decode_frame,
 200     CODEC_CAP_DR1,
 201     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
 202     .max_lowres = 5,
 203     .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
 204 };
 205 #endif
 206
 207 #if CONFIG_PGMYUV_DECODER
 208 AVCodec ff_pgmyuv_decoder = {
 209     "pgmyuv",
 210     AVMEDIA_TYPE_VIDEO,
 211     CODEC_ID_PGMYUV,
 212     sizeof(PNMContext),
 213     ff_pnm_init,
 214     NULL,
 215     ff_pnm_end,
 216     pnm_decode_frame,
 217     CODEC_CAP_DR1,
 218     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 219     .max_lowres = 5,
 220     .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
 221 };
 222 #endif
 223
 224 #if CONFIG_PPM_DECODER
 225 AVCodec ff_ppm_decoder = {
 226     "ppm",
 227     AVMEDIA_TYPE_VIDEO,
 228     CODEC_ID_PPM,
 229     sizeof(PNMContext),
 230     ff_pnm_init,
 231     NULL,
 232     ff_pnm_end,
 233     pnm_decode_frame,
 234     CODEC_CAP_DR1,
 235     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
 236     .max_lowres = 5,
 237     .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
 238 };
 239 #endif
 240
 241 #if CONFIG_PBM_DECODER
 242 AVCodec ff_pbm_decoder = {
 243     "pbm",
 244     AVMEDIA_TYPE_VIDEO,
 245     CODEC_ID_PBM,
 246     sizeof(PNMContext),
 247     ff_pnm_init,
 248     NULL,
 249     ff_pnm_end,
 250     pnm_decode_frame,
 251     CODEC_CAP_DR1,
 252     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
 253     .max_lowres = 5,
 254     .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
 255 };
 256 #endif
 257
 258 #if CONFIG_PAM_DECODER
 259 AVCodec ff_pam_decoder = {
 260     "pam",
 261     AVMEDIA_TYPE_VIDEO,
 262     CODEC_ID_PAM,
 263     sizeof(PNMContext),
 264     ff_pnm_init,
 265     NULL,
 266     ff_pnm_end,
 267     pnm_decode_frame,
 268     CODEC_CAP_DR1,
 269     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
 270     .max_lowres = 5,
 271     .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
 272 };
 273 #endif