Originally committed as revision 2076 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Michael Niedermayer
22 years ago
parent
17d71fb922
commit
be3564edad
5 changed files with 212 additions and 1 deletions
@ -0,0 +1,206 @@ |
||||
/*
|
||||
* 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){ |
||||
fprintf(stderr, "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]; |
||||
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[1]; |
||||
*(cr++) = bytestream[3]; |
||||
|
||||
bytestream+= 4; |
||||
} |
||||
}else{ |
||||
offset= a->offset[y&3]; |
||||
|
||||
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){ |
||||
VCR1Context * const a = avctx->priv_data; |
||||
AVFrame *p= (AVFrame*)&a->picture; |
||||
int i; |
||||
|
||||
common_init(avctx); |
||||
|
||||
avctx->pix_fmt= PIX_FMT_YUV410P; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int encode_init(AVCodecContext *avctx){ |
||||
VCR1Context * const a = avctx->priv_data; |
||||
int i; |
||||
|
||||
common_init(avctx); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int decode_end(AVCodecContext *avctx){ |
||||
VCR1Context * const a = avctx->priv_data; |
||||
|
||||
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 |
||||
Loading…
Reference in new issue