eessppeelllloo/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-12-05 14:30:00 +01:00
Code Issues Packages Projects Releases Wiki Activity

avcodec/ppc/mpegvideo_altivec: Split intra/inter unquantizing

Browse Source 
Don't use a single function that checks mb_intra. Forgotten
in d50635cd24.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-11-19 11:51:03 +01:00
parent 358c569b05
commit 011ef7fc65
1 changed files with 33 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

71
libavcodec/ppc/mpegvideo_altivec.c
View File

@@ -40,41 +40,14 @@
/* AltiVec version of dct_unquantize_h263
this code assumes `block' is 16 bytes-aligned */
static void dct_unquantize_h263_altivec(const MPVContext *s,
int16_t *block, int n, int qscale)
static av_always_inline
void dct_unquantize_h263_altivec(int16_t *block, int nb_coeffs, int qadd, int qmul)
{
int i, qmul, qadd;
int nCoeffs;
qadd = (qscale - 1) | 1;
qmul = qscale << 1;
if (s->mb_intra) {
if (!s->h263_aic) {
if (n < 4)
block[0] = block[0] * s->y_dc_scale;
else
block[0] = block[0] * s->c_dc_scale;
}else
qadd = 0;
i = 1;
if (s->ac_pred)
nCoeffs = 63;
else
nCoeffs = s->intra_scantable.raster_end[s->block_last_index[n]];
} else {
i = 0;
av_assert2(s->block_last_index[n]>=0);
nCoeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
}
{
register const vector signed short vczero = (const vector signed short)vec_splat_s16(0);
DECLARE_ALIGNED(16, short, qmul8) = qmul;
DECLARE_ALIGNED(16, short, qadd8) = qadd;
register vector signed short blockv, qmulv, qaddv, nqaddv, temp1;
register vector bool short blockv_null, blockv_neg;
register short backup_0 = block[0];
qmulv = vec_splat((vec_s16)vec_lde(0, &qmul8), 0);
qaddv = vec_splat((vec_s16)vec_lde(0, &qadd8), 0);
@@ -82,7 +55,7 @@ static void dct_unquantize_h263_altivec(const MPVContext *s,
// vectorize all the 16 bytes-aligned blocks
// of 8 elements
for (register int j = 0; j <= nCoeffs ; j += 8) {
for (register int j = 0; j <= nb_coeffs; j += 8) {
blockv = vec_ld(j << 1, block);
blockv_neg = vec_cmplt(blockv, vczero);
blockv_null = vec_cmpeq(blockv, vczero);
@@ -94,14 +67,36 @@ static void dct_unquantize_h263_altivec(const MPVContext *s,
blockv = vec_sel(temp1, blockv, blockv_null);
vec_st(blockv, j << 1, block);
}
if (i == 1) {
// cheat. this avoid special-casing the first iteration
block[0] = backup_0;
}
}
}
static void dct_unquantize_h263_intra_altivec(const MPVContext *s,
int16_t *block, int n, int qscale)
{
int qadd = (qscale - 1) | 1;
int qmul = qscale << 1;
int block0 = block[0];
if (!s->h263_aic) {
block0 *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
} else
qadd = 0;
int nb_coeffs = s->ac_pred ? 63 : s->intra_scantable.raster_end[s->block_last_index[n]];
dct_unquantize_h263_altivec(block, nb_coeffs, qadd, qmul);
// cheat. this avoid special-casing the first iteration
block[0] = block0;
}
static void dct_unquantize_h263_inter_altivec(const MPVContext *s,
int16_t *block, int n, int qscale)
{
int qadd = (qscale - 1) | 1;
int qmul = qscale << 1;
av_assert2(s->block_last_index[n]>=0);
int nb_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
dct_unquantize_h263_altivec(block, nb_coeffs, qadd, qmul);
}
#endif /* HAVE_ALTIVEC */
av_cold void ff_mpv_unquantize_init_ppc(MPVUnquantDSPContext *s, int bitexact)
@@ -110,7 +105,7 @@ av_cold void ff_mpv_unquantize_init_ppc(MPVUnquantDSPContext *s, int bitexact)
if (!PPC_ALTIVEC(av_get_cpu_flags()))
return;
s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;
s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;
s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_altivec;
s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_altivec;
#endif /* HAVE_ALTIVEC */
}