mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 01:42:20 +00:00
134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/*
|
|
* ATI VCR1 codec
|
|
* Copyright (c) 2003 Michael Niedermayer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* ATI VCR1 codec
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/internal.h"
|
|
|
|
typedef struct VCR1Context {
|
|
int delta[16];
|
|
int offset[4];
|
|
} VCR1Context;
|
|
|
|
static av_cold int vcr1_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
|
|
|
|
if (avctx->width % 8 || avctx->height%4) {
|
|
avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
VCR1Context *const a = avctx->priv_data;
|
|
AVFrame *const p = data;
|
|
const uint8_t *bytestream = avpkt->data;
|
|
const uint8_t *bytestream_end = bytestream + avpkt->size;
|
|
int i, x, y, ret;
|
|
|
|
if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
|
|
av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size , 32 + avctx->height + avctx->width*avctx->height*5/8);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
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 = &p->data[0][y * p->linesize[0]];
|
|
|
|
if ((y & 3) == 0) {
|
|
uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
|
|
uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
|
|
|
|
av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
|
|
|
|
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 {
|
|
av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
|
|
return bytestream - avpkt->data;
|
|
}
|
|
|
|
AVCodec ff_vcr1_decoder = {
|
|
.name = "vcr1",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_VCR1,
|
|
.priv_data_size = sizeof(VCR1Context),
|
|
.init = vcr1_decode_init,
|
|
.decode = vcr1_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|