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avcodec/imm4: stop using FAAN idct

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This commit is contained in:
Paul B Mahol 2018-10-12 18:53:26 +02:00
parent 0c14b73e43
commit 330dd59a30
1 changed files with 15 additions and 8 deletions
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23
libavcodec/imm4.c
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@ -45,12 +45,13 @@ typedef struct IMM4Context {
int factor;
unsigned sindex;
ScanTable intra_scantable;
DECLARE_ALIGNED(32, int16_t, block)[6][64];
IDCTDSPContext idsp;
} IMM4Context;
static const uint8_t intra_cb[] = {
12, 9, 6
24, 18, 12
};
static const uint8_t inter_cb[] = {
@ -140,6 +141,7 @@ static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
int block, int factor, int flag)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
int i, last, len, factor2;
for (i = !flag; i < 64; i++) {
@ -162,7 +164,7 @@ static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
i += len;
if (i >= 64)
break;
s->block[block][i] = factor * factor2;
s->block[block][scantable[i]] = factor * factor2;
if (last)
break;
}
@ -174,6 +176,7 @@ static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
unsigned cbp, int flag)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
int ret, i;
memset(s->block, 0, sizeof(s->block));
@ -186,7 +189,7 @@ static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
x = 128;
x *= 8;
s->block[i][0] = x;
s->block[i][scantable[0]] = x;
}
if (cbp & (1 << (5 - i))) {
@ -204,7 +207,7 @@ static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame
IMM4Context *s = avctx->priv_data;
int ret, x, y;
s->factor = intra_cb[s->sindex] * 2;
s->factor = intra_cb[s->sindex];
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
@ -397,9 +400,9 @@ static int decode_frame(AVCodecContext *avctx, void *data,
s->changed_size = 1;
skip_bits_long(gb, 24 * 8);
type = get_bits_long(gb, 32);
s->sindex = get_bits_long(gb, 32);
if (s->sindex > 2)
return AVERROR_INVALIDDATA;
skip_bits(gb, 16);
s->sindex = get_bits(gb, 16);
s->sindex = FFMIN(s->sindex, 2);
switch (type) {
case 0x19781977:
@ -461,10 +464,14 @@ static av_cold int decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
IMM4Context *s = avctx->priv_data;
uint8_t table[64];
for (int i = 0; i < 64; i++)
table[i] = i;
avctx->idct_algo = FF_IDCT_FAAN;
ff_bswapdsp_init(&s->bdsp);
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, table);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)