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 libavcodec/iff.c
  24  * IFF PBM/ILBM bitmap decoder
  25  */
  26
  27 #include "bytestream.h"
  28 #include "avcodec.h"
  29 #include "get_bits.h"
  30
  31 typedef struct {
  32     AVFrame frame;
  33     int planesize;
  34     uint8_t * planebuf;
  35 } IffContext;
  36
  37 /**
  38  * Convert CMAP buffer (stored in extradata) to lavc palette format
  39  */
  40 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
  41 {
  42     int count, i;
  43
  44     if (avctx->bits_per_coded_sample > 8) {
  45         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
  46         return AVERROR_INVALIDDATA;
  47     }
  48
  49     count = 1 << avctx->bits_per_coded_sample;
  50     if (avctx->extradata_size < count * 3) {
  51         av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
  52         return AVERROR_INVALIDDATA;
  53     }
  54     for (i=0; i < count; i++) {
  55         pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
  56     }
  57     return 0;
  58 }
  59
  60 static av_cold int decode_init(AVCodecContext *avctx)
  61 {
  62     IffContext *s = avctx->priv_data;
  63
  64     if (avctx->bits_per_coded_sample <= 8) {
  65         avctx->pix_fmt = PIX_FMT_PAL8;
  66     } else if (avctx->bits_per_coded_sample <= 32) {
  67         avctx->pix_fmt = PIX_FMT_BGR32;
  68     } else {
  69         return AVERROR_INVALIDDATA;
  70     }
  71
  72     s->planesize = avctx->width / 8;
  73     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
  74     if (!s->planebuf)
  75         return AVERROR(ENOMEM);
  76
  77     s->frame.reference = 1;
  78     if (avctx->get_buffer(avctx, &s->frame) < 0) {
  79         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  80         return AVERROR_UNKNOWN;
  81     }
  82
  83     return avctx->bits_per_coded_sample <= 8 ?
  84        ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
  85 }
  86
  87 /**
  88  * Decode interleaved plane buffer
  89  * @param dst Destination buffer
  90  * @param buf Source buffer
  91  * @param buf_size
  92  * @param bps bits_per_coded_sample
  93  * @param plane plane number to decode as
  94  */
  95 #define DECLARE_DECODEPLANE(suffix, type) \
  96 static void decodeplane##suffix(void *dst, const uint8_t *const buf, int buf_size, int bps, int plane) \
  97 { \
  98     GetBitContext gb; \
  99     int i, b; \
 100     init_get_bits(&gb, buf, buf_size * 8); \
 101     for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) { \
 102         for (b = 0; b < bps; b++) { \
 103             ((type *)dst)[ i*bps + b ] |= get_bits1(&gb) << plane; \
 104         } \
 105     } \
 106 }
 107 DECLARE_DECODEPLANE(8, uint8_t)
 108 DECLARE_DECODEPLANE(32, uint32_t)
 109
 110 static int decode_frame_ilbm(AVCodecContext *avctx,
 111                             void *data, int *data_size,
 112                             AVPacket *avpkt)
 113 {
 114     IffContext *s = avctx->priv_data;
 115     const uint8_t *buf = avpkt->data;
 116     int buf_size = avpkt->size;
 117     const uint8_t *buf_end = buf+buf_size;
 118     int y, plane;
 119
 120     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 121         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 122         return -1;
 123     }
 124
 125     for(y = 0; y < avctx->height; y++ ) {
 126         uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 127         memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 128         for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
 129             if (avctx->pix_fmt == PIX_FMT_PAL8) {
 130                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 131             } else { // PIX_FMT_BGR32
 132                 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 133             }
 134             buf += s->planesize;
 135         }
 136     }
 137
 138     *data_size = sizeof(AVFrame);
 139     *(AVFrame*)data = s->frame;
 140     return buf_size;
 141 }
 142
 143 static int decode_frame_byterun1(AVCodecContext *avctx,
 144                             void *data, int *data_size,
 145                             AVPacket *avpkt)
 146 {
 147     IffContext *s = avctx->priv_data;
 148     const uint8_t *buf = avpkt->data;
 149     int buf_size = avpkt->size;
 150     const uint8_t *buf_end = buf+buf_size;
 151     int y, plane, x;
 152
 153     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 154         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 155         return -1;
 156     }
 157
 158     for(y = 0; y < avctx->height ; y++ ) {
 159         uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 160         if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
 161             memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 162             for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
 163                 for(x = 0; x < s->planesize && buf < buf_end; ) {
 164                     int8_t value = *buf++;
 165                     int length;
 166                     if (value >= 0) {
 167                         length = value + 1;
 168                         memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
 169                         buf += length;
 170                     } else if (value > -128) {
 171                         length = -value + 1;
 172                         memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
 173                     } else { //noop
 174                         continue;
 175                     }
 176                     x += length;
 177                 }
 178                 if (avctx->pix_fmt == PIX_FMT_PAL8) {
 179                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 180                 } else { //PIX_FMT_BGR32
 181                     decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 182                 }
 183             }
 184         } else {
 185             for(x = 0; x < avctx->width && buf < buf_end; ) {
 186                 int8_t value = *buf++;
 187                 int length;
 188                 if (value >= 0) {
 189                     length = value + 1;
 190                     memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
 191                     buf += length;
 192                 } else if (value > -128) {
 193                     length = -value + 1;
 194                     memset(row + x, *buf++, FFMIN(length, avctx->width - x));
 195                 } else { //noop
 196                     continue;
 197                 }
 198                 x += length;
 199             }
 200         }
 201     }
 202
 203     *data_size = sizeof(AVFrame);
 204     *(AVFrame*)data = s->frame;
 205     return buf_size;
 206 }
 207
 208 static av_cold int decode_end(AVCodecContext *avctx)
 209 {
 210     IffContext *s = avctx->priv_data;
 211     if (s->frame.data[0])
 212         avctx->release_buffer(avctx, &s->frame);
 213     av_freep(&s->planebuf);
 214     return 0;
 215 }
 216
 217 AVCodec iff_ilbm_decoder = {
 218     "iff_ilbm",
 219     CODEC_TYPE_VIDEO,
 220     CODEC_ID_IFF_ILBM,
 221     sizeof(IffContext),
 222     decode_init,
 223     NULL,
 224     decode_end,
 225     decode_frame_ilbm,
 226     CODEC_CAP_DR1,
 227     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
 228 };
 229
 230 AVCodec iff_byterun1_decoder = {
 231     "iff_byterun1",
 232     CODEC_TYPE_VIDEO,
 233     CODEC_ID_IFF_BYTERUN1,
 234     sizeof(IffContext),
 235     decode_init,
 236     NULL,
 237     decode_end,
 238     decode_frame_byterun1,
 239     CODEC_CAP_DR1,
 240     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
 241 };