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| author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-10-20 05:27:41 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-10-24 00:46:49 +0200 |
| commit | a8f34f0877e348eef4e84a8466b413c6d438b14b (patch) | |
| tree | e8036d6691327a703ab0f8f9424fac4374cd4b85 /libavcodec/eatgq.c | |
| parent | c262245fd37e50da1e7065affefed287a21fe370 (diff) | |
| download | ffmpeg-a8f34f0877e348eef4e84a8466b413c6d438b14b.tar.gz | |
avcodec/eatgq: Don't use IDCTDSP-API unnecessarily
The eatgq decoder uses a custom IDCT and actually does not
use the IDCTDSP API at all. Somehow it was nevertheless
used to simply apply the identity permutation on ff_zigzag_direct.
This commit stops doing so. It also renames perm to scantable,
because it is only the scantable as given by the spec without
any further permutation performed by us.
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'libavcodec/eatgq.c')
| -rw-r--r-- | libavcodec/eatgq.c | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/libavcodec/eatgq.c b/libavcodec/eatgq.c index a6c3e72f85..627615b4e8 100644 --- a/libavcodec/eatgq.c +++ b/libavcodec/eatgq.c @@ -39,12 +39,10 @@ #include "decode.h" #include "eaidct.h" #include "get_bits.h" -#include "idctdsp.h" typedef struct TgqContext { AVCodecContext *avctx; int width, height; - ScanTable scantable; int qtable[64]; DECLARE_ALIGNED(16, int16_t, block)[6][64]; GetByteContext gb; @@ -53,10 +51,7 @@ typedef struct TgqContext { static av_cold int tgq_decode_init(AVCodecContext *avctx) { TgqContext *s = avctx->priv_data; - uint8_t idct_permutation[64]; s->avctx = avctx; - ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE); - ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct); avctx->framerate = (AVRational){ 15, 1 }; avctx->pix_fmt = AV_PIX_FMT_YUV420P; return 0; @@ -64,15 +59,15 @@ static av_cold int tgq_decode_init(AVCodecContext *avctx) static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) { - uint8_t *perm = s->scantable.permutated; + const uint8_t *scantable = ff_zigzag_direct; int i, j, value; block[0] = get_sbits(gb, 8) * s->qtable[0]; for (i = 1; i < 64;) { switch (show_bits(gb, 3)) { case 4: - block[perm[i++]] = 0; + block[scantable[i++]] = 0; case 0: - block[perm[i++]] = 0; + block[scantable[i++]] = 0; skip_bits(gb, 3); break; case 5: @@ -80,16 +75,16 @@ static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb skip_bits(gb, 2); value = get_bits(gb, 6); for (j = 0; j < value; j++) - block[perm[i++]] = 0; + block[scantable[i++]] = 0; break; case 6: skip_bits(gb, 3); - block[perm[i]] = -s->qtable[perm[i]]; + block[scantable[i]] = -s->qtable[scantable[i]]; i++; break; case 2: skip_bits(gb, 3); - block[perm[i]] = s->qtable[perm[i]]; + block[scantable[i]] = s->qtable[scantable[i]]; i++; break; case 7: // 111b @@ -97,9 +92,9 @@ static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb skip_bits(gb, 2); if (show_bits(gb, 6) == 0x3F) { skip_bits(gb, 6); - block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]]; + block[scantable[i]] = get_sbits(gb, 8) * s->qtable[scantable[i]]; } else { - block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]]; + block[scantable[i]] = get_sbits(gb, 6) * s->qtable[scantable[i]]; } i++; break; |