/* * ATI VCR1 codec * Copyright (c) 2003 Michael Niedermayer * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** * @file vcr1.c * ati vcr1 codec. */ #include "avcodec.h" #include "mpegvideo.h" //#undef NDEBUG //#include <assert.h> typedef struct VCR1Context{ AVCodecContext *avctx; AVFrame picture; int delta[16]; int offset[4]; } VCR1Context; static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { VCR1Context * const a = avctx->priv_data; AVFrame *picture = data; AVFrame * const p= (AVFrame*)&a->picture; uint8_t *bytestream= buf; int i, x, y; *data_size = 0; /* special case for last picture */ if (buf_size == 0) { return 0; } if(p->data[0]) avctx->release_buffer(avctx, p); p->reference= 0; if(avctx->get_buffer(avctx, p) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type= I_TYPE; p->key_frame= 1; for(i=0; i<16; i++){ a->delta[i]= *(bytestream++); bytestream++; } for(y=0; y<avctx->height; y++){ int offset; uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ]; if((y&3) == 0){ uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ]; uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ]; for(i=0; i<4; i++) a->offset[i]= *(bytestream++); offset= a->offset[0] - a->delta[ bytestream[2]&0xF ]; for(x=0; x<avctx->width; x+=4){ luma[0]=( offset += a->delta[ bytestream[2]&0xF ]); luma[1]=( offset += a->delta[ bytestream[2]>>4 ]); luma[2]=( offset += a->delta[ bytestream[0]&0xF ]); luma[3]=( offset += a->delta[ bytestream[0]>>4 ]); luma += 4; *(cb++) = bytestream[3]; *(cr++) = bytestream[1]; bytestream+= 4; } }else{ offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ]; for(x=0; x<avctx->width; x+=8){ luma[0]=( offset += a->delta[ bytestream[2]&0xF ]); luma[1]=( offset += a->delta[ bytestream[2]>>4 ]); luma[2]=( offset += a->delta[ bytestream[3]&0xF ]); luma[3]=( offset += a->delta[ bytestream[3]>>4 ]); luma[4]=( offset += a->delta[ bytestream[0]&0xF ]); luma[5]=( offset += a->delta[ bytestream[0]>>4 ]); luma[6]=( offset += a->delta[ bytestream[1]&0xF ]); luma[7]=( offset += a->delta[ bytestream[1]>>4 ]); luma += 8; bytestream+= 4; } } } *picture= *(AVFrame*)&a->picture; *data_size = sizeof(AVPicture); emms_c(); return buf_size; } #if 0 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ VCR1Context * const a = avctx->priv_data; AVFrame *pict = data; AVFrame * const p= (AVFrame*)&a->picture; int size; int mb_x, mb_y; *p = *pict; p->pict_type= I_TYPE; p->key_frame= 1; emms_c(); align_put_bits(&a->pb); while(get_bit_count(&a->pb)&31) put_bits(&a->pb, 8, 0); size= get_bit_count(&a->pb)/32; return size*4; } #endif static void common_init(AVCodecContext *avctx){ VCR1Context * const a = avctx->priv_data; avctx->coded_frame= (AVFrame*)&a->picture; a->avctx= avctx; } static int decode_init(AVCodecContext *avctx){ common_init(avctx); avctx->pix_fmt= PIX_FMT_YUV410P; return 0; } static int encode_init(AVCodecContext *avctx){ common_init(avctx); return 0; } static int decode_end(AVCodecContext *avctx){ avcodec_default_free_buffers(avctx); return 0; } AVCodec vcr1_decoder = { "vcr1", CODEC_TYPE_VIDEO, CODEC_ID_VCR1, sizeof(VCR1Context), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, }; #if 0 #ifdef CONFIG_ENCODERS AVCodec vcr1_encoder = { "vcr1", CODEC_TYPE_VIDEO, CODEC_ID_VCR1, sizeof(VCR1Context), encode_init, encode_frame, //encode_end, }; #endif //CONFIG_ENCODERS #endif