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libavcodec/cljr.c

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00001 /*
00002  * Cirrus Logic AccuPak (CLJR) codec
00003  * Copyright (c) 2003 Alex Beregszaszi
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "dsputil.h"
00029 #include "bitstream.h"
00030 
00031 /* Disable the encoder. */
00032 #undef CONFIG_CLJR_ENCODER
00033 #define CONFIG_CLJR_ENCODER 0
00034 
00035 typedef struct CLJRContext{
00036     AVCodecContext *avctx;
00037     AVFrame picture;
00038     int delta[16];
00039     int offset[4];
00040     GetBitContext gb;
00041 } CLJRContext;
00042 
00043 static int decode_frame(AVCodecContext *avctx,
00044                         void *data, int *data_size,
00045                         const uint8_t *buf, int buf_size)
00046 {
00047     CLJRContext * const a = avctx->priv_data;
00048     AVFrame *picture = data;
00049     AVFrame * const p= (AVFrame*)&a->picture;
00050     int x, y;
00051 
00052     if(p->data[0])
00053         avctx->release_buffer(avctx, p);
00054 
00055     p->reference= 0;
00056     if(avctx->get_buffer(avctx, p) < 0){
00057         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00058         return -1;
00059     }
00060     p->pict_type= FF_I_TYPE;
00061     p->key_frame= 1;
00062 
00063     init_get_bits(&a->gb, buf, buf_size);
00064 
00065     for(y=0; y<avctx->height; y++){
00066         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
00067         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
00068         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
00069         for(x=0; x<avctx->width; x+=4){
00070                 luma[3] = get_bits(&a->gb, 5) << 3;
00071             luma[2] = get_bits(&a->gb, 5) << 3;
00072             luma[1] = get_bits(&a->gb, 5) << 3;
00073             luma[0] = get_bits(&a->gb, 5) << 3;
00074             luma+= 4;
00075             *(cb++) = get_bits(&a->gb, 6) << 2;
00076             *(cr++) = get_bits(&a->gb, 6) << 2;
00077         }
00078     }
00079 
00080     *picture= *(AVFrame*)&a->picture;
00081     *data_size = sizeof(AVPicture);
00082 
00083     emms_c();
00084 
00085     return buf_size;
00086 }
00087 
00088 #if CONFIG_CLJR_ENCODER
00089 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
00090     CLJRContext * const a = avctx->priv_data;
00091     AVFrame *pict = data;
00092     AVFrame * const p= (AVFrame*)&a->picture;
00093     int size;
00094 
00095     *p = *pict;
00096     p->pict_type= FF_I_TYPE;
00097     p->key_frame= 1;
00098 
00099     emms_c();
00100 
00101     align_put_bits(&a->pb);
00102     while(get_bit_count(&a->pb)&31)
00103         put_bits(&a->pb, 8, 0);
00104 
00105     size= get_bit_count(&a->pb)/32;
00106 
00107     return size*4;
00108 }
00109 #endif
00110 
00111 static av_cold void common_init(AVCodecContext *avctx){
00112     CLJRContext * const a = avctx->priv_data;
00113 
00114     avctx->coded_frame= (AVFrame*)&a->picture;
00115     a->avctx= avctx;
00116 }
00117 
00118 static av_cold int decode_init(AVCodecContext *avctx){
00119 
00120     common_init(avctx);
00121 
00122     avctx->pix_fmt= PIX_FMT_YUV411P;
00123 
00124     return 0;
00125 }
00126 
00127 #if CONFIG_CLJR_ENCODER
00128 static av_cold int encode_init(AVCodecContext *avctx){
00129 
00130     common_init(avctx);
00131 
00132     return 0;
00133 }
00134 #endif
00135 
00136 AVCodec cljr_decoder = {
00137     "cljr",
00138     CODEC_TYPE_VIDEO,
00139     CODEC_ID_CLJR,
00140     sizeof(CLJRContext),
00141     decode_init,
00142     NULL,
00143     NULL,
00144     decode_frame,
00145     CODEC_CAP_DR1,
00146     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
00147 };
00148 
00149 #if CONFIG_CLJR_ENCODER
00150 AVCodec cljr_encoder = {
00151     "cljr",
00152     CODEC_TYPE_VIDEO,
00153     CODEC_ID_CLJR,
00154     sizeof(CLJRContext),
00155     encode_init,
00156     encode_frame,
00157     //encode_end,
00158     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
00159 };
00160 #endif

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