diff options
author | Peter Ross <pross@xvid.org> | 2019-01-13 10:37:28 +0300 |
---|---|---|
committer | Peter Ross <pross@xvid.org> | 2019-01-26 15:48:50 +0300 |
commit | f4756ee9f7cc41e03531b86fe9f4b5e7406065ba (patch) | |
tree | f5caf8111684b1ecca8a57d433fd0bc841584385 /libavcodec/vp3dsp.c | |
parent | 19565c6026016ee95a957ec95af0669103224ab5 (diff) |
avcodec/vp3dsp: add 10 coefficient version of the VP3 IDCT
This version of the IDCT is used by the VP6 decoder.
Signed-off-by: Peter Ross <pross@xvid.org>
Diffstat (limited to 'libavcodec/vp3dsp.c')
-rw-r--r-- | libavcodec/vp3dsp.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libavcodec/vp3dsp.c b/libavcodec/vp3dsp.c index de0130a9cf..ac4c57441c 100644 --- a/libavcodec/vp3dsp.c +++ b/libavcodec/vp3dsp.c @@ -195,6 +195,158 @@ static av_always_inline void idct(uint8_t *dst, ptrdiff_t stride, } } +static av_always_inline void idct10(uint8_t *dst, ptrdiff_t stride, + int16_t *input, int type) +{ + int16_t *ip = input; + + int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H; + int Ed, Gd, Add, Bdd, Fd, Hd; + + int i; + + /* Inverse DCT on the rows now */ + for (i = 0; i < 4; i++) { + /* Check for non-zero values */ + if (ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8]) { + A = M(xC1S7, ip[1 * 8]); + B = M(xC7S1, ip[1 * 8]); + C = M(xC3S5, ip[3 * 8]); + D = -M(xC5S3, ip[3 * 8]); + + Ad = M(xC4S4, (A - C)); + Bd = M(xC4S4, (B - D)); + + Cd = A + C; + Dd = B + D; + + E = M(xC4S4, ip[0 * 8]); + F = E; + + G = M(xC2S6, ip[2 * 8]); + H = M(xC6S2, ip[2 * 8]); + + Ed = E - G; + Gd = E + G; + + Add = F + Ad; + Bdd = Bd - H; + + Fd = F - Ad; + Hd = Bd + H; + + /* Final sequence of operations over-write original inputs */ + ip[0 * 8] = Gd + Cd; + ip[7 * 8] = Gd - Cd; + + ip[1 * 8] = Add + Hd; + ip[2 * 8] = Add - Hd; + + ip[3 * 8] = Ed + Dd; + ip[4 * 8] = Ed - Dd; + + ip[5 * 8] = Fd + Bdd; + ip[6 * 8] = Fd - Bdd; + + } + + ip += 1; + } + + ip = input; + + for (i = 0; i < 8; i++) { + /* Check for non-zero values (bitwise or faster than ||) */ + if (ip[0] | ip[1] | ip[2] | ip[3]) { + A = M(xC1S7, ip[1]); + B = M(xC7S1, ip[1]); + C = M(xC3S5, ip[3]); + D = -M(xC5S3, ip[3]); + + Ad = M(xC4S4, (A - C)); + Bd = M(xC4S4, (B - D)); + + Cd = A + C; + Dd = B + D; + + E = M(xC4S4, ip[0]); + if (type == 1) + E += 16 * 128; + F = E; + + G = M(xC2S6, ip[2]); + H = M(xC6S2, ip[2]); + + Ed = E - G; + Gd = E + G; + + Add = F + Ad; + Bdd = Bd - H; + + Fd = F - Ad; + Hd = Bd + H; + + Gd += 8; + Add += 8; + Ed += 8; + Fd += 8; + + /* Final sequence of operations over-write original inputs. */ + if (type == 1) { + dst[0 * stride] = av_clip_uint8((Gd + Cd) >> 4); + dst[7 * stride] = av_clip_uint8((Gd - Cd) >> 4); + + dst[1 * stride] = av_clip_uint8((Add + Hd) >> 4); + dst[2 * stride] = av_clip_uint8((Add - Hd) >> 4); + + dst[3 * stride] = av_clip_uint8((Ed + Dd) >> 4); + dst[4 * stride] = av_clip_uint8((Ed - Dd) >> 4); + + dst[5 * stride] = av_clip_uint8((Fd + Bdd) >> 4); + dst[6 * stride] = av_clip_uint8((Fd - Bdd) >> 4); + } else { + dst[0 * stride] = av_clip_uint8(dst[0 * stride] + ((Gd + Cd) >> 4)); + dst[7 * stride] = av_clip_uint8(dst[7 * stride] + ((Gd - Cd) >> 4)); + + dst[1 * stride] = av_clip_uint8(dst[1 * stride] + ((Add + Hd) >> 4)); + dst[2 * stride] = av_clip_uint8(dst[2 * stride] + ((Add - Hd) >> 4)); + + dst[3 * stride] = av_clip_uint8(dst[3 * stride] + ((Ed + Dd) >> 4)); + dst[4 * stride] = av_clip_uint8(dst[4 * stride] + ((Ed - Dd) >> 4)); + + dst[5 * stride] = av_clip_uint8(dst[5 * stride] + ((Fd + Bdd) >> 4)); + dst[6 * stride] = av_clip_uint8(dst[6 * stride] + ((Fd - Bdd) >> 4)); + } + } else { + if (type == 1) { + dst[0*stride] = + dst[1*stride] = + dst[2*stride] = + dst[3*stride] = + dst[4*stride] = + dst[5*stride] = + dst[6*stride] = + dst[7*stride] = 128; + } + } + + ip += 8; + dst++; + } +} + +void ff_vp3dsp_idct10_put(uint8_t *dest, ptrdiff_t stride, int16_t *block) +{ + idct10(dest, stride, block, 1); + memset(block, 0, sizeof(*block) * 64); +} + +void ff_vp3dsp_idct10_add(uint8_t *dest, ptrdiff_t stride, int16_t *block) +{ + idct10(dest, stride, block, 2); + memset(block, 0, sizeof(*block) * 64); +} + static void vp3_idct_put_c(uint8_t *dest /* align 8 */, ptrdiff_t stride, int16_t *block /* align 16 */) { |