libavcodec/iff.c

   1 /*
   2  * IFF PBM/ILBM bitmap decoder
   3  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
   4  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * IFF PBM/ILBM bitmap decoder
  26  */
  27
  28 #include "bytestream.h"
  29 #include "avcodec.h"
  30 #include "get_bits.h"
  31 #include "iff.h"
  32
  33 typedef struct {
  34     AVFrame frame;
  35     int planesize;
  36     uint8_t * planebuf;
  37 } IffContext;
  38
  39 /**
  40  * Convert CMAP buffer (stored in extradata) to lavc palette format
  41  */
  42 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
  43 {
  44     int count, i;
  45
  46     if (avctx->bits_per_coded_sample > 8) {
  47         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
  48         return AVERROR_INVALIDDATA;
  49     }
  50
  51     count = 1 << avctx->bits_per_coded_sample;
  52     if (avctx->extradata_size < count * 3) {
  53         av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
  54         return AVERROR_INVALIDDATA;
  55     }
  56     for (i=0; i < count; i++) {
  57         pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
  58     }
  59     return 0;
  60 }
  61
  62 static av_cold int decode_init(AVCodecContext *avctx)
  63 {
  64     IffContext *s = avctx->priv_data;
  65     int err;
  66
  67     if (avctx->bits_per_coded_sample <= 8) {
  68         avctx->pix_fmt = PIX_FMT_PAL8;
  69     } else if (avctx->bits_per_coded_sample <= 32) {
  70         avctx->pix_fmt = PIX_FMT_BGR32;
  71     } else {
  72         return AVERROR_INVALIDDATA;
  73     }
  74
  75     s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary
  76     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
  77     if (!s->planebuf)
  78         return AVERROR(ENOMEM);
  79
  80     s->frame.reference = 1;
  81     if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
  82         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  83         return err;
  84     }
  85
  86     return avctx->bits_per_coded_sample <= 8 ?
  87        ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
  88 }
  89
  90 /**
  91  * Decode interleaved plane buffer up to 8bpp
  92  * @param dst Destination buffer
  93  * @param buf Source buffer
  94  * @param buf_size
  95  * @param bps bits_per_coded_sample (must be <= 8)
  96  * @param plane plane number to decode as
  97  */
  98 static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
  99 {
 100     GetBitContext gb;
 101     int i;
 102     const int b = buf_size * 8;
 103     init_get_bits(&gb, buf, buf_size * 8);
 104     for(i = 0; i < b; i++) {
 105         dst[i] |= get_bits1(&gb) << plane;
 106     }
 107 }
 108
 109 /**
 110  * Decode interleaved plane buffer up to 24bpp
 111  * @param dst Destination buffer
 112  * @param buf Source buffer
 113  * @param buf_size
 114  * @param bps bits_per_coded_sample
 115  * @param plane plane number to decode as
 116  */
 117 static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
 118 {
 119     GetBitContext gb;
 120     int i;
 121     const int b = buf_size * 8;
 122     init_get_bits(&gb, buf, buf_size * 8);
 123     for(i = 0; i < b; i++) {
 124         dst[i] |= get_bits1(&gb) << plane;
 125     }
 126 }
 127
 128 static int decode_frame_ilbm(AVCodecContext *avctx,
 129                             void *data, int *data_size,
 130                             AVPacket *avpkt)
 131 {
 132     IffContext *s = avctx->priv_data;
 133     const uint8_t *buf = avpkt->data;
 134     int buf_size = avpkt->size;
 135     const uint8_t *buf_end = buf+buf_size;
 136     int y, plane;
 137
 138     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 139         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 140         return -1;
 141     }
 142
 143     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 144         for(y = 0; y < avctx->height; y++ ) {
 145             uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 146             memset(row, 0, avctx->width);
 147             for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
 148                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 149                 buf += s->planesize;
 150             }
 151         }
 152     } else { // PIX_FMT_BGR32
 153         for(y = 0; y < avctx->height; y++ ) {
 154             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
 155             memset(row, 0, avctx->width << 2);
 156             for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
 157                 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 158                 buf += s->planesize;
 159             }
 160         }
 161     }
 162
 163     *data_size = sizeof(AVFrame);
 164     *(AVFrame*)data = s->frame;
 165     return buf_size;
 166 }
 167
 168 static int decode_frame_byterun1(AVCodecContext *avctx,
 169                             void *data, int *data_size,
 170                             AVPacket *avpkt)
 171 {
 172     IffContext *s = avctx->priv_data;
 173     const uint8_t *buf = avpkt->data;
 174     int buf_size = avpkt->size;
 175     const uint8_t *buf_end = buf+buf_size;
 176     int y, plane, x;
 177
 178     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 179         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 180         return -1;
 181     }
 182
 183     if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
 184         if (avctx->pix_fmt == PIX_FMT_PAL8) {
 185             for(y = 0; y < avctx->height ; y++ ) {
 186                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 187                 memset(row, 0, avctx->width);
 188                 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
 189                     for(x = 0; x < s->planesize && buf < buf_end; ) {
 190                         int8_t value = *buf++;
 191                         unsigned length;
 192                         if (value >= 0) {
 193                             length = value + 1;
 194                             memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
 195                             buf += length;
 196                         } else if (value > -128) {
 197                             length = -value + 1;
 198                             memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
 199                         } else { //noop
 200                             continue;
 201                         }
 202                         x += length;
 203                     }
 204                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 205                 }
 206             }
 207         } else { //PIX_FMT_BGR32
 208             for(y = 0; y < avctx->height ; y++ ) {
 209                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
 210                 memset(row, 0, avctx->width << 2);
 211                 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
 212                     for(x = 0; x < s->planesize && buf < buf_end; ) {
 213                         int8_t value = *buf++;
 214                         unsigned length;
 215                         if (value >= 0) {
 216                             length = value + 1;
 217                             memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
 218                             buf += length;
 219                         } else if (value > -128) {
 220                             length = -value + 1;
 221                             memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
 222                         } else { // noop
 223                             continue;
 224                         }
 225                         x += length;
 226                     }
 227                     decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 228                 }
 229             }
 230         }
 231     } else {
 232         for(y = 0; y < avctx->height ; y++ ) {
 233             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
 234             for(x = 0; x < avctx->width && buf < buf_end; ) {
 235                 int8_t value = *buf++;
 236                 unsigned length;
 237                 if (value >= 0) {
 238                     length = value + 1;
 239                     memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
 240                     buf += length;
 241                 } else if (value > -128) {
 242                     length = -value + 1;
 243                     memset(row + x, *buf++, FFMIN(length, avctx->width - x));
 244                 } else { //noop
 245                     continue;
 246                 }
 247                 x += length;
 248             }
 249         }
 250     }
 251
 252     *data_size = sizeof(AVFrame);
 253     *(AVFrame*)data = s->frame;
 254     return buf_size;
 255 }
 256
 257 static av_cold int decode_end(AVCodecContext *avctx)
 258 {
 259     IffContext *s = avctx->priv_data;
 260     if (s->frame.data[0])
 261         avctx->release_buffer(avctx, &s->frame);
 262     av_freep(&s->planebuf);
 263     return 0;
 264 }
 265
 266 AVCodec iff_ilbm_decoder = {
 267     "iff_ilbm",
 268     AVMEDIA_TYPE_VIDEO,
 269     CODEC_ID_IFF_ILBM,
 270     sizeof(IffContext),
 271     decode_init,
 272     NULL,
 273     decode_end,
 274     decode_frame_ilbm,
 275     CODEC_CAP_DR1,
 276     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
 277 };
 278
 279 AVCodec iff_byterun1_decoder = {
 280     "iff_byterun1",
 281     AVMEDIA_TYPE_VIDEO,
 282     CODEC_ID_IFF_BYTERUN1,
 283     sizeof(IffContext),
 284     decode_init,
 285     NULL,
 286     decode_end,
 287     decode_frame_byterun1,
 288     CODEC_CAP_DR1,
 289     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
 290 };