mirror of
https://git.videolan.org/git/ffmpeg.git
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198 lines
5.4 KiB
C
198 lines
5.4 KiB
C
/*
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* ATI VCR1 codec
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* Copyright (c) 2003 Michael Niedermayer
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* ati vcr1 codec.
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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//#undef NDEBUG
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//#include <assert.h>
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/* Disable the encoder. */
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#undef CONFIG_VCR1_ENCODER
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#define CONFIG_VCR1_ENCODER 0
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typedef struct VCR1Context{
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AVCodecContext *avctx;
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AVFrame picture;
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int delta[16];
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int offset[4];
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} VCR1Context;
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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VCR1Context * const a = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p= (AVFrame*)&a->picture;
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const uint8_t *bytestream= buf;
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int i, x, y;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference= 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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for(i=0; i<16; i++){
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a->delta[i]= *(bytestream++);
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bytestream++;
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}
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for(y=0; y<avctx->height; y++){
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int offset;
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uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
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if((y&3) == 0){
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uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
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uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
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for(i=0; i<4; i++)
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a->offset[i]= *(bytestream++);
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offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
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for(x=0; x<avctx->width; x+=4){
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luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
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luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
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luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
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luma[3]=( offset += a->delta[ bytestream[0]>>4 ]);
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luma += 4;
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*(cb++) = bytestream[3];
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*(cr++) = bytestream[1];
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bytestream+= 4;
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}
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}else{
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offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
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for(x=0; x<avctx->width; x+=8){
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luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
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luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
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luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
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luma[3]=( offset += a->delta[ bytestream[3]>>4 ]);
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luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
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luma[5]=( offset += a->delta[ bytestream[0]>>4 ]);
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luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
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luma[7]=( offset += a->delta[ bytestream[1]>>4 ]);
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luma += 8;
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bytestream+= 4;
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}
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}
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}
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*picture= *(AVFrame*)&a->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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#if CONFIG_VCR1_ENCODER
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
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VCR1Context * const a = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame * const p= (AVFrame*)&a->picture;
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int size;
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*p = *pict;
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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avpriv_align_put_bits(&a->pb);
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while(get_bit_count(&a->pb)&31)
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put_bits(&a->pb, 8, 0);
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size= get_bit_count(&a->pb)/32;
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return size*4;
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}
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#endif
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static av_cold void common_init(AVCodecContext *avctx){
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VCR1Context * const a = avctx->priv_data;
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avctx->coded_frame= (AVFrame*)&a->picture;
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a->avctx= avctx;
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}
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static av_cold int decode_init(AVCodecContext *avctx){
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common_init(avctx);
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avctx->pix_fmt= PIX_FMT_YUV410P;
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx){
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VCR1Context *s = avctx->priv_data;
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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#if CONFIG_VCR1_ENCODER
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static av_cold int encode_init(AVCodecContext *avctx){
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common_init(avctx);
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return 0;
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}
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#endif
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AVCodec ff_vcr1_decoder = {
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.name = "vcr1",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_VCR1,
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.priv_data_size = sizeof(VCR1Context),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
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};
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#if CONFIG_VCR1_ENCODER
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AVCodec ff_vcr1_encoder = {
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.name = "vcr1",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_VCR1,
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.priv_data_size = sizeof(VCR1Context),
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.init = encode_init,
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.encode = encode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
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};
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#endif
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