libavcodec/cljr.c

   1 /*
   2  * Cirrus Logic AccuPak (CLJR) codec
   3  * Copyright (c) 2003 Alex Beregszaszi
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 "get_bits.h"
  29 #include "put_bits.h"
  30
  31 typedef struct CLJRContext{
  32     AVCodecContext *avctx;
  33     AVFrame picture;
  34 } CLJRContext;
  35
  36 static int decode_frame(AVCodecContext *avctx,
  37                         void *data, int *data_size,
  38                         AVPacket *avpkt)
  39 {
  40     const uint8_t *buf = avpkt->data;
  41     int buf_size = avpkt->size;
  42     CLJRContext * const a = avctx->priv_data;
  43     GetBitContext gb;
  44     AVFrame *picture = data;
  45     AVFrame * const p= (AVFrame*)&a->picture;
  46     int x, y;
  47
  48     if(p->data[0])
  49         avctx->release_buffer(avctx, p);
  50
  51     if(buf_size/avctx->height < avctx->width) {
  52         av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
  53         return -1;
  54     }
  55
  56     p->reference= 0;
  57     if(avctx->get_buffer(avctx, p) < 0){
  58         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  59         return -1;
  60     }
  61     p->pict_type= AV_PICTURE_TYPE_I;
  62     p->key_frame= 1;
  63
  64     init_get_bits(&gb, buf, buf_size * 8);
  65
  66     for(y=0; y<avctx->height; y++){
  67         uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
  68         uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
  69         uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
  70         for(x=0; x<avctx->width; x+=4){
  71             luma[3] = get_bits(&gb, 5) << 3;
  72             luma[2] = get_bits(&gb, 5) << 3;
  73             luma[1] = get_bits(&gb, 5) << 3;
  74             luma[0] = get_bits(&gb, 5) << 3;
  75             luma+= 4;
  76             *(cb++) = get_bits(&gb, 6) << 2;
  77             *(cr++) = get_bits(&gb, 6) << 2;
  78         }
  79     }
  80
  81     *picture= *(AVFrame*)&a->picture;
  82     *data_size = sizeof(AVPicture);
  83
  84     emms_c();
  85
  86     return buf_size;
  87 }
  88
  89 #if CONFIG_CLJR_ENCODER
  90 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
  91     PutBitContext pb;
  92     AVFrame *p = data;
  93     int x, y;
  94
  95     p->pict_type= AV_PICTURE_TYPE_I;
  96     p->key_frame= 1;
  97
  98     init_put_bits(&pb, buf, buf_size / 8);
  99
 100     for (y = 0; y < avctx->height; y++) {
 101         uint8_t *luma = &p->data[0][y * p->linesize[0]];
 102         uint8_t *cb   = &p->data[1][y * p->linesize[1]];
 103         uint8_t *cr   = &p->data[2][y * p->linesize[2]];
 104         for (x = 0; x < avctx->width; x += 4) {
 105             put_bits(&pb, 5, luma[3] >> 3);
 106             put_bits(&pb, 5, luma[2] >> 3);
 107             put_bits(&pb, 5, luma[1] >> 3);
 108             put_bits(&pb, 5, luma[0] >> 3);
 109             luma += 4;
 110             put_bits(&pb, 6, *(cb++) >> 2);
 111             put_bits(&pb, 6, *(cr++) >> 2);
 112         }
 113     }
 114
 115     flush_put_bits(&pb);
 116
 117     emms_c();
 118
 119     return put_bits_count(&pb) / 8;
 120 }
 121 #endif
 122
 123 static av_cold void common_init(AVCodecContext *avctx){
 124     CLJRContext * const a = avctx->priv_data;
 125
 126     avctx->coded_frame= (AVFrame*)&a->picture;
 127     a->avctx= avctx;
 128 }
 129
 130 static av_cold int decode_init(AVCodecContext *avctx){
 131
 132     common_init(avctx);
 133
 134     avctx->pix_fmt= PIX_FMT_YUV411P;
 135
 136     return 0;
 137 }
 138
 139 static av_cold int decode_end(AVCodecContext *avctx) {
 140     CLJRContext *a = avctx->priv_data;
 141
 142     if (a->picture.data[0]);
 143         avctx->release_buffer(avctx, &a->picture);
 144 }
 145
 146 #if CONFIG_CLJR_ENCODER
 147 static av_cold int encode_init(AVCodecContext *avctx){
 148
 149     common_init(avctx);
 150
 151     return 0;
 152 }
 153 #endif
 154
 155 AVCodec ff_cljr_decoder = {
 156     .name           = "cljr",
 157     .type           = AVMEDIA_TYPE_VIDEO,
 158     .id             = CODEC_ID_CLJR,
 159     .priv_data_size = sizeof(CLJRContext),
 160     .init           = decode_init,
 161     .close          = decode_end,
 162     .decode         = decode_frame,
 163     .capabilities   = CODEC_CAP_DR1,
 164     .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 165 };
 166
 167 #if CONFIG_CLJR_ENCODER
 168 AVCodec ff_cljr_encoder = {
 169     .name           = "cljr",
 170     .type           = AVMEDIA_TYPE_VIDEO,
 171     .id             = CODEC_ID_CLJR,
 172     .priv_data_size = sizeof(CLJRContext),
 173     .init           = encode_init,
 174     .encode         = encode_frame,
 175     .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
 176                                                    PIX_FMT_NONE },
 177     .long_name      = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
 178 };
 179 #endif