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 libavcodec/cljr.c
  24  * Cirrus Logic AccuPak codec.
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "get_bits.h"
  30
  31 /* Disable the encoder. */
  32 #undef CONFIG_CLJR_ENCODER
  33 #define CONFIG_CLJR_ENCODER 0
  34
  35 typedef struct CLJRContext{
  36     AVCodecContext *avctx;
  37     AVFrame picture;
  38     int delta[16];
  39     int offset[4];
  40     GetBitContext gb;
  41 } CLJRContext;
  42
  43 static int decode_frame(AVCodecContext *avctx,
  44                         void *data, int *data_size,
  45                         AVPacket *avpkt)
  46 {
  47     const uint8_t *buf = avpkt->data;
  48     int buf_size = avpkt->size;
  49     CLJRContext * const a = avctx->priv_data;
  50     AVFrame *picture = data;
  51     AVFrame * const p= (AVFrame*)&a->picture;
  52     int x, y;
  53
  54     if(p->data[0])
  55         avctx->release_buffer(avctx, p);
  56
  57     p->reference= 0;
  58     if(avctx->get_buffer(avctx, p) < 0){
  59         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  60         return -1;
  61     }
  62     p->pict_type= FF_I_TYPE;
  63     p->key_frame= 1;
  64
  65     init_get_bits(&a->gb, buf, buf_size);
  66
  67     for(y=0; y<avctx->height; y++){
  68         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  69         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
  70         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
  71         for(x=0; x<avctx->width; x+=4){
  72                 luma[3] = get_bits(&a->gb, 5) << 3;
  73             luma[2] = get_bits(&a->gb, 5) << 3;
  74             luma[1] = get_bits(&a->gb, 5) << 3;
  75             luma[0] = get_bits(&a->gb, 5) << 3;
  76             luma+= 4;
  77             *(cb++) = get_bits(&a->gb, 6) << 2;
  78             *(cr++) = get_bits(&a->gb, 6) << 2;
  79         }
  80     }
  81
  82     *picture= *(AVFrame*)&a->picture;
  83     *data_size = sizeof(AVPicture);
  84
  85     emms_c();
  86
  87     return buf_size;
  88 }
  89
  90 #if CONFIG_CLJR_ENCODER
  91 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
  92     CLJRContext * const a = avctx->priv_data;
  93     AVFrame *pict = data;
  94     AVFrame * const p= (AVFrame*)&a->picture;
  95     int size;
  96
  97     *p = *pict;
  98     p->pict_type= FF_I_TYPE;
  99     p->key_frame= 1;
 100
 101     emms_c();
 102
 103     align_put_bits(&a->pb);
 104     while(get_bit_count(&a->pb)&31)
 105         put_bits(&a->pb, 8, 0);
 106
 107     size= get_bit_count(&a->pb)/32;
 108
 109     return size*4;
 110 }
 111 #endif
 112
 113 static av_cold void common_init(AVCodecContext *avctx){
 114     CLJRContext * const a = avctx->priv_data;
 115
 116     avctx->coded_frame= (AVFrame*)&a->picture;
 117     a->avctx= avctx;
 118 }
 119
 120 static av_cold int decode_init(AVCodecContext *avctx){
 121
 122     common_init(avctx);
 123
 124     avctx->pix_fmt= PIX_FMT_YUV411P;
 125
 126     return 0;
 127 }
 128
 129 #if CONFIG_CLJR_ENCODER
 130 static av_cold int encode_init(AVCodecContext *avctx){
 131
 132     common_init(avctx);
 133
 134     return 0;
 135 }
 136 #endif
 137
 138 AVCodec cljr_decoder = {
 139     "cljr",
 140     CODEC_TYPE_VIDEO,
 141     CODEC_ID_CLJR,
 142     sizeof(CLJRContext),
 143     decode_init,
 144     NULL,
 145     NULL,
 146     decode_frame,
 147     CODEC_CAP_DR1,
 148     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 149 };
 150
 151 #if CONFIG_CLJR_ENCODER
 152 AVCodec cljr_encoder = {
 153     "cljr",
 154     CODEC_TYPE_VIDEO,
 155     CODEC_ID_CLJR,
 156     sizeof(CLJRContext),
 157     encode_init,
 158     encode_frame,
 159     //encode_end,
 160     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 161 };
 162 #endif