libavcodec/cljr.c

   1 /*
   2  * Cirrus Logic AccuPak (CLJR) codec
   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 cljr.c
  24  * Cirrus Logic AccuPak codec.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "bitstream.h"
  30
  31 /* Disable the encoder. */
  32 #undef CONFIG_CLJR_ENCODER
  33
  34 typedef struct CLJRContext{
  35     AVCodecContext *avctx;
  36     AVFrame picture;
  37     int delta[16];
  38     int offset[4];
  39     GetBitContext gb;
  40 } CLJRContext;
  41
  42 static int decode_frame(AVCodecContext *avctx,
  43                         void *data, int *data_size,
  44                         const uint8_t *buf, int buf_size)
  45 {
  46     CLJRContext * const a = avctx->priv_data;
  47     AVFrame *picture = data;
  48     AVFrame * const p= (AVFrame*)&a->picture;
  49     int x, y;
  50
  51     if(p->data[0])
  52         avctx->release_buffer(avctx, p);
  53
  54     p->reference= 0;
  55     if(avctx->get_buffer(avctx, p) < 0){
  56         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  57         return -1;
  58     }
  59     p->pict_type= FF_I_TYPE;
  60     p->key_frame= 1;
  61
  62     init_get_bits(&a->gb, buf, buf_size);
  63
  64     for(y=0; y<avctx->height; y++){
  65         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  66         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
  67         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
  68         for(x=0; x<avctx->width; x+=4){
  69                 luma[3] = get_bits(&a->gb, 5) << 3;
  70             luma[2] = get_bits(&a->gb, 5) << 3;
  71             luma[1] = get_bits(&a->gb, 5) << 3;
  72             luma[0] = get_bits(&a->gb, 5) << 3;
  73             luma+= 4;
  74             *(cb++) = get_bits(&a->gb, 6) << 2;
  75             *(cr++) = get_bits(&a->gb, 6) << 2;
  76         }
  77     }
  78
  79     *picture= *(AVFrame*)&a->picture;
  80     *data_size = sizeof(AVPicture);
  81
  82     emms_c();
  83
  84     return buf_size;
  85 }
  86
  87 #ifdef CONFIG_CLJR_ENCODER
  88 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
  89     CLJRContext * const a = avctx->priv_data;
  90     AVFrame *pict = data;
  91     AVFrame * const p= (AVFrame*)&a->picture;
  92     int size;
  93     int mb_x, mb_y;
  94
  95     *p = *pict;
  96     p->pict_type= FF_I_TYPE;
  97     p->key_frame= 1;
  98
  99     emms_c();
 100
 101     align_put_bits(&a->pb);
 102     while(get_bit_count(&a->pb)&31)
 103         put_bits(&a->pb, 8, 0);
 104
 105     size= get_bit_count(&a->pb)/32;
 106
 107     return size*4;
 108 }
 109 #endif
 110
 111 static av_cold void common_init(AVCodecContext *avctx){
 112     CLJRContext * const a = avctx->priv_data;
 113
 114     avctx->coded_frame= (AVFrame*)&a->picture;
 115     a->avctx= avctx;
 116 }
 117
 118 static av_cold int decode_init(AVCodecContext *avctx){
 119
 120     common_init(avctx);
 121
 122     avctx->pix_fmt= PIX_FMT_YUV411P;
 123
 124     return 0;
 125 }
 126
 127 #ifdef CONFIG_CLJR_ENCODER
 128 static av_cold int encode_init(AVCodecContext *avctx){
 129
 130     common_init(avctx);
 131
 132     return 0;
 133 }
 134 #endif
 135
 136 AVCodec cljr_decoder = {
 137     "cljr",
 138     CODEC_TYPE_VIDEO,
 139     CODEC_ID_CLJR,
 140     sizeof(CLJRContext),
 141     decode_init,
 142     NULL,
 143     NULL,
 144     decode_frame,
 145     CODEC_CAP_DR1,
 146     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 147 };
 148
 149 #ifdef CONFIG_CLJR_ENCODER
 150 AVCodec cljr_encoder = {
 151     "cljr",
 152     CODEC_TYPE_VIDEO,
 153     CODEC_ID_cljr,
 154     sizeof(CLJRContext),
 155     encode_init,
 156     encode_frame,
 157     //encode_end,
 158     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 159 };
 160 #endif