Libav
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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