• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/iff.c

Go to the documentation of this file.
00001 /*
00002  * IFF PBM/ILBM bitmap decoder
00003  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
00004  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 #include "bytestream.h"
00029 #include "avcodec.h"
00030 #include "get_bits.h"
00031 #include "iff.h"
00032 
00033 typedef struct {
00034     AVFrame frame;
00035     int planesize;
00036     uint8_t * planebuf;
00037 } IffContext;
00038 
00042 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
00043 {
00044     int count, i;
00045 
00046     if (avctx->bits_per_coded_sample > 8) {
00047         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
00048         return AVERROR_INVALIDDATA;
00049     }
00050 
00051     count = 1 << avctx->bits_per_coded_sample;
00052     if (avctx->extradata_size < count * 3) {
00053         av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
00054         return AVERROR_INVALIDDATA;
00055     }
00056     for (i=0; i < count; i++) {
00057         pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
00058     }
00059     return 0;
00060 }
00061 
00062 static av_cold int decode_init(AVCodecContext *avctx)
00063 {
00064     IffContext *s = avctx->priv_data;
00065     int err;
00066 
00067     if (avctx->bits_per_coded_sample <= 8) {
00068         avctx->pix_fmt = PIX_FMT_PAL8;
00069     } else if (avctx->bits_per_coded_sample <= 32) {
00070         avctx->pix_fmt = PIX_FMT_BGR32;
00071     } else {
00072         return AVERROR_INVALIDDATA;
00073     }
00074 
00075     s->planesize = avctx->width >> 3;
00076     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
00077     if (!s->planebuf)
00078         return AVERROR(ENOMEM);
00079 
00080     s->frame.reference = 1;
00081     if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
00082         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00083         return err;
00084     }
00085 
00086     return avctx->bits_per_coded_sample <= 8 ?
00087        ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
00088 }
00089 
00098 static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
00099 {
00100     GetBitContext gb;
00101     int i;
00102     const int b = (buf_size * 8) + bps - 1;
00103     init_get_bits(&gb, buf, buf_size * 8);
00104     for(i = 0; i < b; i++) {
00105         dst[i] |= get_bits1(&gb) << plane;
00106     }
00107 }
00108 
00117 static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
00118 {
00119     GetBitContext gb;
00120     int i;
00121     const int b = (buf_size * 8) + bps - 1;
00122     init_get_bits(&gb, buf, buf_size * 8);
00123     for(i = 0; i < b; i++) {
00124         dst[i] |= get_bits1(&gb) << plane;
00125     }
00126 }
00127 
00128 static int decode_frame_ilbm(AVCodecContext *avctx,
00129                             void *data, int *data_size,
00130                             AVPacket *avpkt)
00131 {
00132     IffContext *s = avctx->priv_data;
00133     const uint8_t *buf = avpkt->data;
00134     int buf_size = avpkt->size;
00135     const uint8_t *buf_end = buf+buf_size;
00136     int y, plane;
00137 
00138     if (avctx->reget_buffer(avctx, &s->frame) < 0){
00139         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00140         return -1;
00141     }
00142 
00143     if (avctx->pix_fmt == PIX_FMT_PAL8) {
00144         for(y = 0; y < avctx->height; y++ ) {
00145             uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
00146             memset(row, 0, avctx->width);
00147             for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
00148                 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
00149                 buf += s->planesize;
00150             }
00151         }
00152     } else { // PIX_FMT_BGR32
00153         for(y = 0; y < avctx->height; y++ ) {
00154             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
00155             memset(row, 0, avctx->width << 2);
00156             for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
00157                 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
00158                 buf += s->planesize;
00159             }
00160         }
00161     }
00162 
00163     *data_size = sizeof(AVFrame);
00164     *(AVFrame*)data = s->frame;
00165     return buf_size;
00166 }
00167 
00168 static int decode_frame_byterun1(AVCodecContext *avctx,
00169                             void *data, int *data_size,
00170                             AVPacket *avpkt)
00171 {
00172     IffContext *s = avctx->priv_data;
00173     const uint8_t *buf = avpkt->data;
00174     int buf_size = avpkt->size;
00175     const uint8_t *buf_end = buf+buf_size;
00176     int y, plane, x;
00177 
00178     if (avctx->reget_buffer(avctx, &s->frame) < 0){
00179         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00180         return -1;
00181     }
00182 
00183     if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
00184         if (avctx->pix_fmt == PIX_FMT_PAL8) {
00185             for(y = 0; y < avctx->height ; y++ ) {
00186                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
00187                 memset(row, 0, avctx->width);
00188                 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
00189                     for(x = 0; x < s->planesize && buf < buf_end; ) {
00190                         int8_t value = *buf++;
00191                         unsigned length;
00192                         if (value >= 0) {
00193                             length = value + 1;
00194                             memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
00195                             buf += length;
00196                         } else if (value > -128) {
00197                             length = -value + 1;
00198                             memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
00199                         } else { //noop
00200                             continue;
00201                         }
00202                         x += length;
00203                     }
00204                     decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
00205                 }
00206             }
00207         } else { //PIX_FMT_BGR32
00208             for(y = 0; y < avctx->height ; y++ ) {
00209                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
00210                 memset(row, 0, avctx->width << 2);
00211                 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
00212                     for(x = 0; x < s->planesize && buf < buf_end; ) {
00213                         int8_t value = *buf++;
00214                         unsigned length;
00215                         if (value >= 0) {
00216                             length = value + 1;
00217                             memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
00218                             buf += length;
00219                         } else if (value > -128) {
00220                             length = -value + 1;
00221                             memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
00222                         } else { // noop
00223                             continue;
00224                         }
00225                         x += length;
00226                     }
00227                     decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
00228                 }
00229             }
00230         }
00231     } else {
00232         for(y = 0; y < avctx->height ; y++ ) {
00233             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
00234             for(x = 0; x < avctx->width && buf < buf_end; ) {
00235                 int8_t value = *buf++;
00236                 unsigned length;
00237                 if (value >= 0) {
00238                     length = value + 1;
00239                     memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
00240                     buf += length;
00241                 } else if (value > -128) {
00242                     length = -value + 1;
00243                     memset(row + x, *buf++, FFMIN(length, avctx->width - x));
00244                 } else { //noop
00245                     continue;
00246                 }
00247                 x += length;
00248             }
00249         }
00250     }
00251 
00252     *data_size = sizeof(AVFrame);
00253     *(AVFrame*)data = s->frame;
00254     return buf_size;
00255 }
00256 
00257 static av_cold int decode_end(AVCodecContext *avctx)
00258 {
00259     IffContext *s = avctx->priv_data;
00260     if (s->frame.data[0])
00261         avctx->release_buffer(avctx, &s->frame);
00262     av_freep(&s->planebuf);
00263     return 0;
00264 }
00265 
00266 AVCodec iff_ilbm_decoder = {
00267     "iff_ilbm",
00268     AVMEDIA_TYPE_VIDEO,
00269     CODEC_ID_IFF_ILBM,
00270     sizeof(IffContext),
00271     decode_init,
00272     NULL,
00273     decode_end,
00274     decode_frame_ilbm,
00275     CODEC_CAP_DR1,
00276     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
00277 };
00278 
00279 AVCodec iff_byterun1_decoder = {
00280     "iff_byterun1",
00281     AVMEDIA_TYPE_VIDEO,
00282     CODEC_ID_IFF_BYTERUN1,
00283     sizeof(IffContext),
00284     decode_init,
00285     NULL,
00286     decode_end,
00287     decode_frame_byterun1,
00288     CODEC_CAP_DR1,
00289     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
00290 };

Generated on Fri Sep 16 2011 17:17:37 for FFmpeg by  doxygen 1.7.1