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 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 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 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 91static 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 113static 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 120static 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 130static av_cold int encode_init(AVCodecContext *avctx){ 131 132 common_init(avctx); 133 134 return 0; 135} 136#endif 137 138AVCodec cljr_decoder = { 139 "cljr", 140 AVMEDIA_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 152AVCodec cljr_encoder = { 153 "cljr", 154 AVMEDIA_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 163