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fic: use correct IDCT

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Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Kostya Shishkov 2014-04-01 21:00:47 +02:00 committed by Derek Buitenhuis
parent 911fa05b51
commit 93e15a3238
2 changed files with 53 additions and 12 deletions
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2
configure vendored
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@ -1737,7 +1737,7 @@ ffv1_decoder_select="golomb rangecoder"
ffv1_encoder_select="rangecoder"
ffvhuff_decoder_select="huffyuv_decoder"
ffvhuff_encoder_select="huffyuv_encoder"
fic_decoder_select="dsputil golomb"
fic_decoder_select="golomb"
flac_decoder_select="golomb"
flac_encoder_select="dsputil golomb lpc"
flashsv_decoder_deps="zlib"

63
libavcodec/fic.c
View File

@ -24,7 +24,6 @@
#include "libavutil/common.h"
#include "avcodec.h"
#include "internal.h"
#include "dsputil.h"
#include "get_bits.h"
#include "golomb.h"
@ -40,9 +39,6 @@ typedef struct FICContext {
AVCodecContext *avctx;
AVFrame *frame;
DSPContext dsp;
ScanTable scantable;
FICThreadContext *slice_data;
int slice_data_size;
@ -80,6 +76,55 @@ static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
#define FIC_HEADER_SIZE 27
static av_always_inline void fic_idct(int16_t *blk, int step, int shift)
{
const int t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
const int t4 = 5793 * (t2 + t0 + 0x800 >> 12);
const int t5 = 5793 * (t3 + t1 + 0x800 >> 12);
const int t6 = t2 - t0;
const int t7 = t3 - t1;
const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
const int tA = (blk[0 * step] - blk[4 * step] << 15) + (1 << shift - 1);
const int tB = (blk[0 * step] + blk[4 * step] << 15) + (1 << shift - 1);
blk[0 * step] = ( t4 + t9 + tB) >> shift;
blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;
blk[3 * step] = ( t5 - t9 + tB) >> shift;
blk[4 * step] = ( -t5 - t9 + tB) >> shift;
blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift;
blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift;
blk[7 * step] = ( -t4 + t9 + tB) >> shift;
}
static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
{
int i, j;
int16_t *ptr;
ptr = block;
for (i = 0; i < 8; i++) {
fic_idct(ptr, 8, 13);
ptr++;
}
ptr = block;
for (i = 0; i < 8; i++) {
fic_idct(ptr, 1, 20);
ptr += 8;
}
ptr = block;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++)
dst[i] = av_clip_uint8(ptr[i]);
dst += stride;
ptr += 8;
}
}
static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
uint8_t *dst, int stride, int16_t *block)
{
@ -94,16 +139,16 @@ static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
return 0;
}
ctx->dsp.clear_block(block);
memset(block, 0, sizeof(*block) * 64);
num_coeff = get_bits(gb, 7);
if (num_coeff > 64)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_coeff; i++)
block[ctx->scantable.permutated[i]] = get_se_golomb(gb) * ctx->qmat[i];
block[ff_zigzag_direct[i]] = get_se_golomb(gb) * ctx->qmat[i];
ctx->dsp.idct_put(dst, stride, block);
fic_idct_put(dst, stride, block);
return 0;
}
@ -283,10 +328,6 @@ static av_cold int fic_decode_init(AVCodecContext *avctx)
if (!ctx->frame)
return AVERROR(ENOMEM);
ff_dsputil_init(&ctx->dsp, avctx);
ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
return 0;
}