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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 "get_bits.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                         AVPacket *avpkt)
00046 {
00047     const uint8_t *buf = avpkt->data;
00048     int buf_size = avpkt->size;
00049     CLJRContext * const a = avctx->priv_data;
00050     AVFrame *picture = data;
00051     AVFrame * const p= (AVFrame*)&a->picture;
00052     int x, y;
00053 
00054     if(p->data[0])
00055         avctx->release_buffer(avctx, p);
00056 
00057     p->reference= 0;
00058     if(avctx->get_buffer(avctx, p) < 0){
00059         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00060         return -1;
00061     }
00062     p->pict_type= FF_I_TYPE;
00063     p->key_frame= 1;
00064 
00065     init_get_bits(&a->gb, buf, buf_size);
00066 
00067     for(y=0; y<avctx->height; y++){
00068         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
00069         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
00070         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
00071         for(x=0; x<avctx->width; x+=4){
00072                 luma[3] = get_bits(&a->gb, 5) << 3;
00073             luma[2] = get_bits(&a->gb, 5) << 3;
00074             luma[1] = get_bits(&a->gb, 5) << 3;
00075             luma[0] = get_bits(&a->gb, 5) << 3;
00076             luma+= 4;
00077             *(cb++) = get_bits(&a->gb, 6) << 2;
00078             *(cr++) = get_bits(&a->gb, 6) << 2;
00079         }
00080     }
00081 
00082     *picture= *(AVFrame*)&a->picture;
00083     *data_size = sizeof(AVPicture);
00084 
00085     emms_c();
00086 
00087     return buf_size;
00088 }
00089 
00090 #if CONFIG_CLJR_ENCODER
00091 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
00092     CLJRContext * const a = avctx->priv_data;
00093     AVFrame *pict = data;
00094     AVFrame * const p= (AVFrame*)&a->picture;
00095     int size;
00096 
00097     *p = *pict;
00098     p->pict_type= FF_I_TYPE;
00099     p->key_frame= 1;
00100 
00101     emms_c();
00102 
00103     align_put_bits(&a->pb);
00104     while(get_bit_count(&a->pb)&31)
00105         put_bits(&a->pb, 8, 0);
00106 
00107     size= get_bit_count(&a->pb)/32;
00108 
00109     return size*4;
00110 }
00111 #endif
00112 
00113 static av_cold void common_init(AVCodecContext *avctx){
00114     CLJRContext * const a = avctx->priv_data;
00115 
00116     avctx->coded_frame= (AVFrame*)&a->picture;
00117     a->avctx= avctx;
00118 }
00119 
00120 static av_cold int decode_init(AVCodecContext *avctx){
00121 
00122     common_init(avctx);
00123 
00124     avctx->pix_fmt= PIX_FMT_YUV411P;
00125 
00126     return 0;
00127 }
00128 
00129 #if CONFIG_CLJR_ENCODER
00130 static av_cold int encode_init(AVCodecContext *avctx){
00131 
00132     common_init(avctx);
00133 
00134     return 0;
00135 }
00136 #endif
00137 
00138 AVCodec cljr_decoder = {
00139     "cljr",
00140     AVMEDIA_TYPE_VIDEO,
00141     CODEC_ID_CLJR,
00142     sizeof(CLJRContext),
00143     decode_init,
00144     NULL,
00145     NULL,
00146     decode_frame,
00147     CODEC_CAP_DR1,
00148     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
00149 };
00150 
00151 #if CONFIG_CLJR_ENCODER
00152 AVCodec cljr_encoder = {
00153     "cljr",
00154     AVMEDIA_TYPE_VIDEO,
00155     CODEC_ID_CLJR,
00156     sizeof(CLJRContext),
00157     encode_init,
00158     encode_frame,
00159     //encode_end,
00160     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
00161 };
00162 #endif

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