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  1. /*
  2.  * ATI VCR1 codec
  3.  * Copyright (c) 2003 Michael Niedermayer
  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.  * ATI VCR1 codec
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "internal.h"
  29. #include "libavutil/avassert.h"
  30. #include "libavutil/internal.h"
  31.  
  32. typedef struct VCR1Context {
  33.     int delta[16];
  34.     int offset[4];
  35. } VCR1Context;
  36.  
  37. static av_cold int vcr1_decode_init(AVCodecContext *avctx)
  38. {
  39.     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
  40.  
  41.     if (avctx->width % 8 || avctx->height%4) {
  42.         avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
  43.         return AVERROR_INVALIDDATA;
  44.     }
  45.  
  46.     return 0;
  47. }
  48.  
  49. static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
  50.                              int *got_frame, AVPacket *avpkt)
  51. {
  52.     VCR1Context *const a      = avctx->priv_data;
  53.     AVFrame *const p          = data;
  54.     const uint8_t *bytestream = avpkt->data;
  55.     const uint8_t *bytestream_end = bytestream + avpkt->size;
  56.     int i, x, y, ret;
  57.  
  58.     if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
  59.         av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size ,  32 + avctx->height + avctx->width*avctx->height*5/8);
  60.         return AVERROR(EINVAL);
  61.     }
  62.  
  63.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  64.         return ret;
  65.     p->pict_type = AV_PICTURE_TYPE_I;
  66.     p->key_frame = 1;
  67.  
  68.     for (i = 0; i < 16; i++) {
  69.         a->delta[i] = *bytestream++;
  70.         bytestream++;
  71.     }
  72.  
  73.     for (y = 0; y < avctx->height; y++) {
  74.         int offset;
  75.         uint8_t *luma = &p->data[0][y * p->linesize[0]];
  76.  
  77.         if ((y & 3) == 0) {
  78.             uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
  79.             uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
  80.  
  81.             av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
  82.  
  83.             for (i = 0; i < 4; i++)
  84.                 a->offset[i] = *bytestream++;
  85.  
  86.             offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
  87.             for (x = 0; x < avctx->width; x += 4) {
  88.                 luma[0]     = offset += a->delta[bytestream[2] & 0xF];
  89.                 luma[1]     = offset += a->delta[bytestream[2] >>  4];
  90.                 luma[2]     = offset += a->delta[bytestream[0] & 0xF];
  91.                 luma[3]     = offset += a->delta[bytestream[0] >>  4];
  92.                 luma       += 4;
  93.  
  94.                 *cb++       = bytestream[3];
  95.                 *cr++       = bytestream[1];
  96.  
  97.                 bytestream += 4;
  98.             }
  99.         } else {
  100.             av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
  101.  
  102.             offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
  103.  
  104.             for (x = 0; x < avctx->width; x += 8) {
  105.                 luma[0]     = offset += a->delta[bytestream[2] & 0xF];
  106.                 luma[1]     = offset += a->delta[bytestream[2] >>  4];
  107.                 luma[2]     = offset += a->delta[bytestream[3] & 0xF];
  108.                 luma[3]     = offset += a->delta[bytestream[3] >>  4];
  109.                 luma[4]     = offset += a->delta[bytestream[0] & 0xF];
  110.                 luma[5]     = offset += a->delta[bytestream[0] >>  4];
  111.                 luma[6]     = offset += a->delta[bytestream[1] & 0xF];
  112.                 luma[7]     = offset += a->delta[bytestream[1] >>  4];
  113.                 luma       += 8;
  114.                 bytestream += 4;
  115.             }
  116.         }
  117.     }
  118.  
  119.     *got_frame = 1;
  120.  
  121.     return bytestream - avpkt->data;
  122. }
  123.  
  124. AVCodec ff_vcr1_decoder = {
  125.     .name           = "vcr1",
  126.     .long_name      = NULL_IF_CONFIG_SMALL("ATI VCR1"),
  127.     .type           = AVMEDIA_TYPE_VIDEO,
  128.     .id             = AV_CODEC_ID_VCR1,
  129.     .priv_data_size = sizeof(VCR1Context),
  130.     .init           = vcr1_decode_init,
  131.     .decode         = vcr1_decode_frame,
  132.     .capabilities   = CODEC_CAP_DR1,
  133. };
  134.