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
  91  * @param dst Destination buffer
  92  * @param buf Source buffer
  93  * @param buf_size
  94  * @param bps bits_per_coded_sample
  95  * @param plane plane number to decode as
  96  */
  97 #define DECLARE_DECODEPLANE(suffix, type) \
  98 static void decodeplane##suffix(void *dst, const uint8_t *const buf, int buf_size, int bps, int plane) \
  99 { \
 100     GetBitContext gb; \
 101     int i, b; \
 102     init_get_bits(&gb, buf, buf_size * 8); \
 103     for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) { \
 104         for (b = 0; b < bps; b++) { \
 105             ((type *)dst)[ i*bps + b ] |= get_bits1(&gb) << plane; \
 106         } \
 107     } \
 108 }
 109 DECLARE_DECODEPLANE(8, uint8_t)
 110 DECLARE_DECODEPLANE(32, uint32_t)
 111
 112 static int decode_frame_ilbm(AVCodecContext *avctx,
 113                             void *data, int *data_size,
 114                             AVPacket *avpkt)
 115 {
 116     IffContext *s = avctx->priv_data;
 117     const uint8_t *buf = avpkt->data;
 118     int buf_size = avpkt->size;
 119     const uint8_t *buf_end = buf+buf_size;
 120     int y, plane;
 121
 122     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 123         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 124         return -1;
 125     }
 126
 127     for(y = 0; y < avctx->height; y++ ) {
 128         uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 129         memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 130         for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
 131             if (avctx->pix_fmt == PIX_FMT_PAL8) {
 132                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 133             } else { // PIX_FMT_BGR32
 134                 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
 135             }
 136             buf += s->planesize;
 137         }
 138     }
 139
 140     *data_size = sizeof(AVFrame);
 141     *(AVFrame*)data = s->frame;
 142     return buf_size;
 143 }
 144
 145 static int decode_frame_byterun1(AVCodecContext *avctx,
 146                             void *data, int *data_size,
 147                             AVPacket *avpkt)
 148 {
 149     IffContext *s = avctx->priv_data;
 150     const uint8_t *buf = avpkt->data;
 151     int buf_size = avpkt->size;
 152     const uint8_t *buf_end = buf+buf_size;
 153     int y, plane, x;
 154
 155     if (avctx->reget_buffer(avctx, &s->frame) < 0){
 156         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 157         return -1;
 158     }
 159
 160     for(y = 0; y < avctx->height ; y++ ) {
 161         uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
 162         if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
 163             memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
 164             for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
 165                 for(x = 0; x < s->planesize && buf < buf_end; ) {
 166                     int8_t value = *buf++;
 167                     int length;
 168                     if (value >= 0) {
 169                         length = value + 1;
 170                         memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
 171                         buf += length;
 172                     } else if (value > -128) {
 173                         length = -value + 1;
 174                         memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
 175                     } else { //noop
 176                         continue;
 177                     }
 178                     x += length;
 179                 }
 180                 if (avctx->pix_fmt == PIX_FMT_PAL8) {
 181                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 182                 } else { //PIX_FMT_BGR32
 183                     decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
 184                 }
 185             }
 186         } else {
 187             for(x = 0; x < avctx->width && buf < buf_end; ) {
 188                 int8_t value = *buf++;
 189                 int length;
 190                 if (value >= 0) {
 191                     length = value + 1;
 192                     memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
 193                     buf += length;
 194                 } else if (value > -128) {
 195                     length = -value + 1;
 196                     memset(row + x, *buf++, FFMIN(length, avctx->width - x));
 197                 } else { //noop
 198                     continue;
 199                 }
 200                 x += length;
 201             }
 202         }
 203     }
 204
 205     *data_size = sizeof(AVFrame);
 206     *(AVFrame*)data = s->frame;
 207     return buf_size;
 208 }
 209
 210 static av_cold int decode_end(AVCodecContext *avctx)
 211 {
 212     IffContext *s = avctx->priv_data;
 213     if (s->frame.data[0])
 214         avctx->release_buffer(avctx, &s->frame);
 215     av_freep(&s->planebuf);
 216     return 0;
 217 }
 218
 219 AVCodec iff_ilbm_decoder = {
 220     "iff_ilbm",
 221     AVMEDIA_TYPE_VIDEO,
 222     CODEC_ID_IFF_ILBM,
 223     sizeof(IffContext),
 224     decode_init,
 225     NULL,
 226     decode_end,
 227     decode_frame_ilbm,
 228     CODEC_CAP_DR1,
 229     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
 230 };
 231
 232 AVCodec iff_byterun1_decoder = {
 233     "iff_byterun1",
 234     AVMEDIA_TYPE_VIDEO,
 235     CODEC_ID_IFF_BYTERUN1,
 236     sizeof(IffContext),
 237     decode_init,
 238     NULL,
 239     decode_end,
 240     decode_frame_byterun1,
 241     CODEC_CAP_DR1,
 242     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
 243 };