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  1. /*
  2.  * Cirrus Logic AccuPak (CLJR) decoder
  3.  * Copyright (c) 2003 Alex Beregszaszi
  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.  * Cirrus Logic AccuPak decoder.
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "get_bits.h"
  29. #include "internal.h"
  30.  
  31. static int decode_frame(AVCodecContext *avctx,
  32.                         void *data, int *got_frame,
  33.                         AVPacket *avpkt)
  34. {
  35.     const uint8_t *buf = avpkt->data;
  36.     int buf_size       = avpkt->size;
  37.     GetBitContext gb;
  38.     AVFrame * const p = data;
  39.     int x, y, ret;
  40.  
  41.     if (avctx->height <= 0 || avctx->width <= 0) {
  42.         av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
  43.         return AVERROR_INVALIDDATA;
  44.     }
  45.  
  46.     if (buf_size / avctx->height < avctx->width) {
  47.         av_log(avctx, AV_LOG_ERROR,
  48.                "Resolution larger than buffer size. Invalid header?\n");
  49.         return AVERROR_INVALIDDATA;
  50.     }
  51.  
  52.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  53.         return ret;
  54.     p->pict_type = AV_PICTURE_TYPE_I;
  55.     p->key_frame = 1;
  56.  
  57.     init_get_bits(&gb, buf, buf_size * 8);
  58.  
  59.     for (y = 0; y < avctx->height; y++) {
  60.         uint8_t *luma = &p->data[0][y * p->linesize[0]];
  61.         uint8_t *cb   = &p->data[1][y * p->linesize[1]];
  62.         uint8_t *cr   = &p->data[2][y * p->linesize[2]];
  63.         for (x = 0; x < avctx->width; x += 4) {
  64.             luma[3] = (get_bits(&gb, 5)*33) >> 2;
  65.             luma[2] = (get_bits(&gb, 5)*33) >> 2;
  66.             luma[1] = (get_bits(&gb, 5)*33) >> 2;
  67.             luma[0] = (get_bits(&gb, 5)*33) >> 2;
  68.             luma += 4;
  69.             *(cb++) = get_bits(&gb, 6) << 2;
  70.             *(cr++) = get_bits(&gb, 6) << 2;
  71.         }
  72.     }
  73.  
  74.     *got_frame = 1;
  75.  
  76.     return buf_size;
  77. }
  78.  
  79. static av_cold int decode_init(AVCodecContext *avctx)
  80. {
  81.     avctx->pix_fmt = AV_PIX_FMT_YUV411P;
  82.     return 0;
  83. }
  84.  
  85. AVCodec ff_cljr_decoder = {
  86.     .name           = "cljr",
  87.     .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
  88.     .type           = AVMEDIA_TYPE_VIDEO,
  89.     .id             = AV_CODEC_ID_CLJR,
  90.     .init           = decode_init,
  91.     .decode         = decode_frame,
  92.     .capabilities   = AV_CODEC_CAP_DR1,
  93. };
  94.  
  95.