libavcodec/iff.c

   1 /*
   2  * IFF PBM/ILBM bitmap decoder
   3  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
   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 /**
  23  * @file
  24  * IFF PBM/ILBM bitmap decoder
  25  */
  26
  27 #include "bytestream.h"
  28 #include "avcodec.h"
  29 #include "get_bits.h"
  30 #include "iff.h"
  31
  32 typedef struct {
  33     AVFrame frame;
  34     int planesize;
  35     uint8_t * planebuf;
  36 } IffContext;
  37
  38 /**
  39  * Convert CMAP buffer (stored in extradata) to lavc palette format
  40  */
  41 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
  42 {
  43     int count, i;
  44
  45     if (avctx->bits_per_coded_sample > 8) {
  46         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
  47         return AVERROR_INVALIDDATA;
  48     }
  49
  50     count = 1 << avctx->bits_per_coded_sample;
  51     if (avctx->extradata_size < count * 3) {
  52         av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
  53         return AVERROR_INVALIDDATA;
  54     }
  55     for (i=0; i < count; i++) {
  56         pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
  57     }
  58     return 0;
  59 }
  60
  61 static av_cold int decode_init(AVCodecContext *avctx)
  62 {
  63     IffContext *s = avctx->priv_data;
  64     int err;
  65
  66     if (avctx->bits_per_coded_sample <= 8) {
  67         avctx->pix_fmt = PIX_FMT_PAL8;
  68     } else if (avctx->bits_per_coded_sample <= 32) {
  69         avctx->pix_fmt = PIX_FMT_BGR32;
  70     } else {
  71         return AVERROR_INVALIDDATA;
  72     }
  73
  74     s->planesize = avctx->width / 8;
  75     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
  76     if (!s->planebuf)
  77         return AVERROR(ENOMEM);
  78
  79     s->frame.reference = 1;
  80     if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
  81         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  82         return err;
  83     }
  84
  85     return avctx->bits_per_coded_sample <= 8 ?
  86        ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
  87 }
  88
  89 /**
  90  * Decode interleaved plane buffer up to 8bpp
  91  * @param dst Destination buffer
  92  * @param buf Source buffer
  93  * @param buf_size
  94  * @param bps bits_per_coded_sample (must be <= 8)
  95  * @param plane plane number to decode as
  96  */
  97 static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
  98 {
  99     GetBitContext gb;
 100     int i, b;
 101     init_get_bits(&gb, buf, buf_size * 8);
 102     for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) {
 103         for (b = 0; b < bps; b++) {
 104             dst[ i*bps + b ] |= get_bits1(&gb) << plane;
 105         }
 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, b;
 121     init_get_bits(&gb, buf, buf_size * 8);
 122     for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) {
 123         for (b = 0; b < bps; b++) {
 124             dst[ i*bps + b ] |= get_bits1(&gb) << plane;
 125         }
 126     }
 127 }
 128
 129 static int decode_frame_ilbm(AVCodecContext *avctx,
 130                             void *data, int *data_size,
 131                             AVPacket *avpkt)
 132 {
 133     IffContext *s = avctx->priv_data;
 134     const uint8_t *buf = avpkt->data;
 135     int buf_size = avpkt->size;
 136     const uint8_t *buf_end = buf+buf_size;
 137     int y, plane;
 138
 139     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 140         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 141         return -1;
 142     }
 143
 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->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 147         for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
 148             if (avctx->pix_fmt == PIX_FMT_PAL8) {
 149                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 150             } else { // PIX_FMT_BGR32
 151                 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 152             }
 153             buf += s->planesize;
 154         }
 155     }
 156
 157     *data_size = sizeof(AVFrame);
 158     *(AVFrame*)data = s->frame;
 159     return buf_size;
 160 }
 161
 162 static int decode_frame_byterun1(AVCodecContext *avctx,
 163                             void *data, int *data_size,
 164                             AVPacket *avpkt)
 165 {
 166     IffContext *s = avctx->priv_data;
 167     const uint8_t *buf = avpkt->data;
 168     int buf_size = avpkt->size;
 169     const uint8_t *buf_end = buf+buf_size;
 170     int y, plane, x;
 171
 172     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 173         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 174         return -1;
 175     }
 176
 177     for(y = 0; y < avctx->height ; y++ ) {
 178         uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 179         if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
 180             memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 181             for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
 182                 for(x = 0; x < s->planesize && buf < buf_end; ) {
 183                     int8_t value = *buf++;
 184                     int length;
 185                     if (value >= 0) {
 186                         length = value + 1;
 187                         memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
 188                         buf += length;
 189                     } else if (value > -128) {
 190                         length = -value + 1;
 191                         memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
 192                     } else { //noop
 193                         continue;
 194                     }
 195                     x += length;
 196                 }
 197                 if (avctx->pix_fmt == PIX_FMT_PAL8) {
 198                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 199                 } else { //PIX_FMT_BGR32
 200                     decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 201                 }
 202             }
 203         } else {
 204             for(x = 0; x < avctx->width && buf < buf_end; ) {
 205                 int8_t value = *buf++;
 206                 int length;
 207                 if (value >= 0) {
 208                     length = value + 1;
 209                     memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
 210                     buf += length;
 211                 } else if (value > -128) {
 212                     length = -value + 1;
 213                     memset(row + x, *buf++, FFMIN(length, avctx->width - x));
 214                 } else { //noop
 215                     continue;
 216                 }
 217                 x += length;
 218             }
 219         }
 220     }
 221
 222     *data_size = sizeof(AVFrame);
 223     *(AVFrame*)data = s->frame;
 224     return buf_size;
 225 }
 226
 227 static av_cold int decode_end(AVCodecContext *avctx)
 228 {
 229     IffContext *s = avctx->priv_data;
 230     if (s->frame.data[0])
 231         avctx->release_buffer(avctx, &s->frame);
 232     av_freep(&s->planebuf);
 233     return 0;
 234 }
 235
 236 AVCodec iff_ilbm_decoder = {
 237     "iff_ilbm",
 238     AVMEDIA_TYPE_VIDEO,
 239     CODEC_ID_IFF_ILBM,
 240     sizeof(IffContext),
 241     decode_init,
 242     NULL,
 243     decode_end,
 244     decode_frame_ilbm,
 245     CODEC_CAP_DR1,
 246     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
 247 };
 248
 249 AVCodec iff_byterun1_decoder = {
 250     "iff_byterun1",
 251     AVMEDIA_TYPE_VIDEO,
 252     CODEC_ID_IFF_BYTERUN1,
 253     sizeof(IffContext),
 254     decode_init,
 255     NULL,
 256     decode_end,
 257     decode_frame_byterun1,
 258     CODEC_CAP_DR1,
 259     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
 260 };