Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Autodesk RLE Decoder
  3.  * Copyright (C) 2005 the ffmpeg project
  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.  * Autodesk RLE Video Decoder by Konstantin Shishkov
  25.  */
  26.  
  27. #include <stdio.h>
  28. #include <stdlib.h>
  29. #include <string.h>
  30.  
  31. #include "avcodec.h"
  32. #include "internal.h"
  33. #include "msrledec.h"
  34.  
  35. typedef struct AascContext {
  36.     AVCodecContext *avctx;
  37.     GetByteContext gb;
  38.     AVFrame *frame;
  39.  
  40.     uint32_t palette[AVPALETTE_COUNT];
  41.     int palette_size;
  42. } AascContext;
  43.  
  44. static av_cold int aasc_decode_init(AVCodecContext *avctx)
  45. {
  46.     AascContext *s = avctx->priv_data;
  47.     uint8_t *ptr;
  48.     int i;
  49.  
  50.     s->avctx = avctx;
  51.     switch (avctx->bits_per_coded_sample) {
  52.     case 8:
  53.         avctx->pix_fmt = AV_PIX_FMT_PAL8;
  54.  
  55.         ptr = avctx->extradata;
  56.         s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
  57.         for (i = 0; i < s->palette_size / 4; i++) {
  58.             s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
  59.             ptr += 4;
  60.         }
  61.         break;
  62.     case 16:
  63.         avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
  64.         break;
  65.     case 24:
  66.         avctx->pix_fmt = AV_PIX_FMT_BGR24;
  67.         break;
  68.     default:
  69.         av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
  70.         return -1;
  71.     }
  72.  
  73.     s->frame = av_frame_alloc();
  74.     if (!s->frame)
  75.         return AVERROR(ENOMEM);
  76.  
  77.     return 0;
  78. }
  79.  
  80. static int aasc_decode_frame(AVCodecContext *avctx,
  81.                               void *data, int *got_frame,
  82.                               AVPacket *avpkt)
  83. {
  84.     const uint8_t *buf = avpkt->data;
  85.     int buf_size       = avpkt->size;
  86.     AascContext *s     = avctx->priv_data;
  87.     int compr, i, stride, psize, ret;
  88.  
  89.     if (buf_size < 4) {
  90.         av_log(avctx, AV_LOG_ERROR, "frame too short\n");
  91.         return AVERROR_INVALIDDATA;
  92.     }
  93.  
  94.     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
  95.         return ret;
  96.  
  97.     compr     = AV_RL32(buf);
  98.     buf      += 4;
  99.     buf_size -= 4;
  100.     psize = avctx->bits_per_coded_sample / 8;
  101.     switch (avctx->codec_tag) {
  102.     case MKTAG('A', 'A', 'S', '4'):
  103.         bytestream2_init(&s->gb, buf - 4, buf_size + 4);
  104.         ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
  105.         break;
  106.     case MKTAG('A', 'A', 'S', 'C'):
  107.     switch (compr) {
  108.     case 0:
  109.         stride = (avctx->width * psize + psize) & ~psize;
  110.         if (buf_size < stride * avctx->height)
  111.             return AVERROR_INVALIDDATA;
  112.         for (i = avctx->height - 1; i >= 0; i--) {
  113.             memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
  114.             buf += stride;
  115.             buf_size -= stride;
  116.         }
  117.         break;
  118.     case 1:
  119.         bytestream2_init(&s->gb, buf, buf_size);
  120.         ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
  121.         break;
  122.     default:
  123.         av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
  124.         return AVERROR_INVALIDDATA;
  125.     }
  126.         break;
  127.     default:
  128.         av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
  129.         return -1;
  130.     }
  131.  
  132.     if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
  133.         memcpy(s->frame->data[1], s->palette, s->palette_size);
  134.  
  135.     *got_frame = 1;
  136.     if ((ret = av_frame_ref(data, s->frame)) < 0)
  137.         return ret;
  138.  
  139.     /* report that the buffer was completely consumed */
  140.     return buf_size;
  141. }
  142.  
  143. static av_cold int aasc_decode_end(AVCodecContext *avctx)
  144. {
  145.     AascContext *s = avctx->priv_data;
  146.  
  147.     av_frame_free(&s->frame);
  148.  
  149.     return 0;
  150. }
  151.  
  152. AVCodec ff_aasc_decoder = {
  153.     .name           = "aasc",
  154.     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
  155.     .type           = AVMEDIA_TYPE_VIDEO,
  156.     .id             = AV_CODEC_ID_AASC,
  157.     .priv_data_size = sizeof(AascContext),
  158.     .init           = aasc_decode_init,
  159.     .close          = aasc_decode_end,
  160.     .decode         = aasc_decode_frame,
  161.     .capabilities   = CODEC_CAP_DR1,
  162. };
  163.