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 "bitstream.h" 30 31/* Disable the encoder. */ 32#undef CONFIG_CLJR_ENCODER 33#define CONFIG_CLJR_ENCODER 0 34 35typedef struct CLJRContext{ 36 AVCodecContext *avctx; 37 AVFrame picture; 38 int delta[16]; 39 int offset[4]; 40 GetBitContext gb; 41} CLJRContext; 42 43static int decode_frame(AVCodecContext *avctx, 44 void *data, int *data_size, 45 const uint8_t *buf, int buf_size) 46{ 47 CLJRContext * const a = avctx->priv_data; 48 AVFrame *picture = data; 49 AVFrame * const p= (AVFrame*)&a->picture; 50 int x, y; 51 52 if(p->data[0]) 53 avctx->release_buffer(avctx, p); 54 55 p->reference= 0; 56 if(avctx->get_buffer(avctx, p) < 0){ 57 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 58 return -1; 59 } 60 p->pict_type= FF_I_TYPE; 61 p->key_frame= 1; 62 63 init_get_bits(&a->gb, buf, buf_size); 64 65 for(y=0; y<avctx->height; y++){ 66 uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ]; 67 uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ]; 68 uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ]; 69 for(x=0; x<avctx->width; x+=4){ 70 luma[3] = get_bits(&a->gb, 5) << 3; 71 luma[2] = get_bits(&a->gb, 5) << 3; 72 luma[1] = get_bits(&a->gb, 5) << 3; 73 luma[0] = get_bits(&a->gb, 5) << 3; 74 luma+= 4; 75 *(cb++) = get_bits(&a->gb, 6) << 2; 76 *(cr++) = get_bits(&a->gb, 6) << 2; 77 } 78 } 79 80 *picture= *(AVFrame*)&a->picture; 81 *data_size = sizeof(AVPicture); 82 83 emms_c(); 84 85 return buf_size; 86} 87 88#if CONFIG_CLJR_ENCODER 89static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ 90 CLJRContext * const a = avctx->priv_data; 91 AVFrame *pict = data; 92 AVFrame * const p= (AVFrame*)&a->picture; 93 int size; 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 111static 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 118static 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#if CONFIG_CLJR_ENCODER 128static av_cold int encode_init(AVCodecContext *avctx){ 129 130 common_init(avctx); 131 132 return 0; 133} 134#endif 135 136AVCodec 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#if CONFIG_CLJR_ENCODER 150AVCodec 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 161