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| author | Michael Niedermayer <michaelni@gmx.at> | 2013-12-10 03:14:41 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-12-10 03:16:58 +0100 |
| commit | 0e575c24d62a3d9f51bca04d22c234e3857b86a9 (patch) | |
| tree | d47e6926167d98c821f685ef2111d745044f66d6 /libavcodec/ffv1dec.c | |
| parent | 2bdda9a15c048a63630eec4918510c5fec05e437 (diff) | |
| download | ffmpeg-0e575c24d62a3d9f51bca04d22c234e3857b86a9.tar.gz | |
ffv1.4: use 2 coefficients for calculating the Y plane in the RCT
0-0.7% improved compression
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/ffv1dec.c')
| -rw-r--r-- | libavcodec/ffv1dec.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c index 6c01ebf15f..d7dd110545 100644 --- a/libavcodec/ffv1dec.c +++ b/libavcodec/ffv1dec.c @@ -260,7 +260,7 @@ static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int if (s->slice_coding_mode != 1) { b -= offset; r -= offset; - g -= ((b + r) * s->slice_rct_y_coef) >> 2; + g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2; b += g; r += g; } @@ -334,8 +334,9 @@ static int decode_slice_header(FFV1Context *f, FFV1Context *fs) fs->slice_reset_contexts = get_rac(c, state); fs->slice_coding_mode = get_symbol(c, state, 0); if (fs->slice_coding_mode != 1) { - fs->slice_rct_y_coef = get_symbol(c, state, 0); - if (fs->slice_rct_y_coef > 2U) { + fs->slice_rct_by_coef = get_symbol(c, state, 0); + fs->slice_rct_ry_coef = get_symbol(c, state, 0); + if ((uint64_t)fs->slice_rct_by_coef + (uint64_t)fs->slice_rct_ry_coef > 4) { av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n"); return AVERROR_INVALIDDATA; } @@ -388,7 +389,8 @@ static int decode_slice(AVCodecContext *c, void *arg) } } - fs->slice_rct_y_coef = 1; + fs->slice_rct_by_coef = 1; + fs->slice_rct_ry_coef = 1; if (f->version > 2) { if (ffv1_init_slice_state(f, fs) < 0) |