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 "internal.h" 24#include "put_bits.h" 25#include "pnm.h" 26 27static void samplecpy(uint8_t *dst, const uint8_t *src, int n, int maxval) 28{ 29 if (maxval <= 255) { 30 memcpy(dst, src, n); 31 } else { 32 int i; 33 for (i=0; i<n/2; i++) { 34 ((uint16_t *)dst)[i] = AV_RB16(src+2*i); 35 } 36 } 37} 38 39static int pnm_decode_frame(AVCodecContext *avctx, void *data, 40 int *got_frame, AVPacket *avpkt) 41{ 42 const uint8_t *buf = avpkt->data; 43 int buf_size = avpkt->size; 44 PNMContext * const s = avctx->priv_data; 45 AVFrame * const p = data; 46 int i, j, n, linesize, h, upgrade = 0, is_mono = 0; 47 unsigned char *ptr; 48 int components, sample_len, ret; 49 50 s->bytestream_start = 51 s->bytestream = (uint8_t *)buf; 52 s->bytestream_end = (uint8_t *)buf + buf_size; 53 54 if ((ret = ff_pnm_decode_header(avctx, s)) < 0) 55 return ret; 56 57 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 58 return ret; 59 p->pict_type = AV_PICTURE_TYPE_I; 60 p->key_frame = 1; 61 avctx->bits_per_raw_sample = av_log2(s->maxval) + 1; 62 63 switch (avctx->pix_fmt) { 64 default: 65 return AVERROR(EINVAL); 66 case AV_PIX_FMT_RGBA64: 67 n = avctx->width * 8; 68 components=4; 69 sample_len=16; 70 if (s->maxval < 65535) 71 upgrade = 2; 72 goto do_read; 73 case AV_PIX_FMT_RGB48: 74 n = avctx->width * 6; 75 components=3; 76 sample_len=16; 77 if (s->maxval < 65535) 78 upgrade = 2; 79 goto do_read; 80 case AV_PIX_FMT_RGBA: 81 n = avctx->width * 4; 82 components=4; 83 sample_len=8; 84 goto do_read; 85 case AV_PIX_FMT_RGB24: 86 n = avctx->width * 3; 87 components=3; 88 sample_len=8; 89 if (s->maxval < 255) 90 upgrade = 1; 91 goto do_read; 92 case AV_PIX_FMT_GRAY8: 93 n = avctx->width; 94 components=1; 95 sample_len=8; 96 if (s->maxval < 255) 97 upgrade = 1; 98 goto do_read; 99 case AV_PIX_FMT_GRAY8A: 100 n = avctx->width * 2; 101 components=2; 102 sample_len=8; 103 goto do_read; 104 case AV_PIX_FMT_GRAY16: 105 n = avctx->width * 2; 106 components=1; 107 sample_len=16; 108 if (s->maxval < 65535) 109 upgrade = 2; 110 goto do_read; 111 case AV_PIX_FMT_MONOWHITE: 112 case AV_PIX_FMT_MONOBLACK: 113 n = (avctx->width + 7) >> 3; 114 components=1; 115 sample_len=1; 116 is_mono = 1; 117 do_read: 118 ptr = p->data[0]; 119 linesize = p->linesize[0]; 120 if (s->bytestream + n * avctx->height > s->bytestream_end) 121 return AVERROR_INVALIDDATA; 122 if(s->type < 4 || (is_mono && s->type==7)){ 123 for (i=0; i<avctx->height; i++) { 124 PutBitContext pb; 125 init_put_bits(&pb, ptr, linesize); 126 for(j=0; j<avctx->width * components; j++){ 127 unsigned int c=0; 128 int v=0; 129 if(s->type < 4) 130 while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' )) 131 s->bytestream++; 132 if(s->bytestream >= s->bytestream_end) 133 return AVERROR_INVALIDDATA; 134 if (is_mono) { 135 /* read a single digit */ 136 v = (*s->bytestream++)&1; 137 } else { 138 /* read a sequence of digits */ 139 do { 140 v = 10*v + c; 141 c = (*s->bytestream++) - '0'; 142 } while (c <= 9); 143 } 144 if (sample_len == 16) { 145 ((uint16_t*)ptr)[j] = (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval; 146 } else 147 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval); 148 } 149 if (sample_len != 16) 150 flush_put_bits(&pb); 151 ptr+= linesize; 152 } 153 }else{ 154 for (i = 0; i < avctx->height; i++) { 155 if (!upgrade) 156 samplecpy(ptr, s->bytestream, n, s->maxval); 157 else if (upgrade == 1) { 158 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval; 159 for (j = 0; j < n; j++) 160 ptr[j] = (s->bytestream[j] * f + 64) >> 7; 161 } else if (upgrade == 2) { 162 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval; 163 for (j = 0; j < n / 2; j++) { 164 v = av_be2ne16(((uint16_t *)s->bytestream)[j]); 165 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; 166 } 167 } 168 s->bytestream += n; 169 ptr += linesize; 170 } 171 } 172 break; 173 case AV_PIX_FMT_YUV420P: 174 case AV_PIX_FMT_YUV420P9: 175 case AV_PIX_FMT_YUV420P10: 176 { 177 unsigned char *ptr1, *ptr2; 178 179 n = avctx->width; 180 ptr = p->data[0]; 181 linesize = p->linesize[0]; 182 if (s->maxval >= 256) 183 n *= 2; 184 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) 185 return AVERROR_INVALIDDATA; 186 for (i = 0; i < avctx->height; i++) { 187 samplecpy(ptr, s->bytestream, n, s->maxval); 188 s->bytestream += n; 189 ptr += linesize; 190 } 191 ptr1 = p->data[1]; 192 ptr2 = p->data[2]; 193 n >>= 1; 194 h = avctx->height >> 1; 195 for (i = 0; i < h; i++) { 196 samplecpy(ptr1, s->bytestream, n, s->maxval); 197 s->bytestream += n; 198 samplecpy(ptr2, s->bytestream, n, s->maxval); 199 s->bytestream += n; 200 ptr1 += p->linesize[1]; 201 ptr2 += p->linesize[2]; 202 } 203 } 204 break; 205 case AV_PIX_FMT_YUV420P16: 206 { 207 uint16_t *ptr1, *ptr2; 208 const int f = (65535 * 32768 + s->maxval / 2) / s->maxval; 209 unsigned int j, v; 210 211 n = avctx->width * 2; 212 ptr = p->data[0]; 213 linesize = p->linesize[0]; 214 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) 215 return AVERROR_INVALIDDATA; 216 for (i = 0; i < avctx->height; i++) { 217 for (j = 0; j < n / 2; j++) { 218 v = av_be2ne16(((uint16_t *)s->bytestream)[j]); 219 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; 220 } 221 s->bytestream += n; 222 ptr += linesize; 223 } 224 ptr1 = (uint16_t*)p->data[1]; 225 ptr2 = (uint16_t*)p->data[2]; 226 n >>= 1; 227 h = avctx->height >> 1; 228 for (i = 0; i < h; i++) { 229 for (j = 0; j < n / 2; j++) { 230 v = av_be2ne16(((uint16_t *)s->bytestream)[j]); 231 ptr1[j] = (v * f + 16384) >> 15; 232 } 233 s->bytestream += n; 234 235 for (j = 0; j < n / 2; j++) { 236 v = av_be2ne16(((uint16_t *)s->bytestream)[j]); 237 ptr2[j] = (v * f + 16384) >> 15; 238 } 239 s->bytestream += n; 240 241 ptr1 += p->linesize[1] / 2; 242 ptr2 += p->linesize[2] / 2; 243 } 244 } 245 break; 246 } 247 *got_frame = 1; 248 249 return s->bytestream - s->bytestream_start; 250} 251 252 253#if CONFIG_PGM_DECODER 254AVCodec ff_pgm_decoder = { 255 .name = "pgm", 256 .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), 257 .type = AVMEDIA_TYPE_VIDEO, 258 .id = AV_CODEC_ID_PGM, 259 .priv_data_size = sizeof(PNMContext), 260 .decode = pnm_decode_frame, 261 .capabilities = CODEC_CAP_DR1, 262}; 263#endif 264 265#if CONFIG_PGMYUV_DECODER 266AVCodec ff_pgmyuv_decoder = { 267 .name = "pgmyuv", 268 .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), 269 .type = AVMEDIA_TYPE_VIDEO, 270 .id = AV_CODEC_ID_PGMYUV, 271 .priv_data_size = sizeof(PNMContext), 272 .decode = pnm_decode_frame, 273 .capabilities = CODEC_CAP_DR1, 274}; 275#endif 276 277#if CONFIG_PPM_DECODER 278AVCodec ff_ppm_decoder = { 279 .name = "ppm", 280 .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), 281 .type = AVMEDIA_TYPE_VIDEO, 282 .id = AV_CODEC_ID_PPM, 283 .priv_data_size = sizeof(PNMContext), 284 .decode = pnm_decode_frame, 285 .capabilities = CODEC_CAP_DR1, 286}; 287#endif 288 289#if CONFIG_PBM_DECODER 290AVCodec ff_pbm_decoder = { 291 .name = "pbm", 292 .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), 293 .type = AVMEDIA_TYPE_VIDEO, 294 .id = AV_CODEC_ID_PBM, 295 .priv_data_size = sizeof(PNMContext), 296 .decode = pnm_decode_frame, 297 .capabilities = CODEC_CAP_DR1, 298}; 299#endif 300 301#if CONFIG_PAM_DECODER 302AVCodec ff_pam_decoder = { 303 .name = "pam", 304 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), 305 .type = AVMEDIA_TYPE_VIDEO, 306 .id = AV_CODEC_ID_PAM, 307 .priv_data_size = sizeof(PNMContext), 308 .decode = pnm_decode_frame, 309 .capabilities = CODEC_CAP_DR1, 310}; 311#endif 312