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| author | Mark Thompson <sw@jkqxz.net> | 2025-04-27 19:43:19 +0100 |
|---|---|---|
| committer | Mark Thompson <sw@jkqxz.net> | 2025-04-30 22:57:56 +0100 |
| commit | 585455f7b3270b389b0b8a751562d42b0e4769fb (patch) | |
| tree | 1d4065b39f0e4b60ef3d3f9cf3f2a98c1ba47098 | |
| parent | 0b588bfb51ecb262f714994696e77b6a1c7b1cef (diff) | |
| download | ffmpeg-585455f7b3270b389b0b8a751562d42b0e4769fb.tar.gz | |
apv_decode: Replace division with shift
The compiler can't see that this should be a shift and generates a real
division which is slow enough to appear in profiles on its own.
| -rw-r--r-- | libavcodec/apv_decode.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/libavcodec/apv_decode.c b/libavcodec/apv_decode.c index 6fe52ffd84..b1e1db7d64 100644 --- a/libavcodec/apv_decode.c +++ b/libavcodec/apv_decode.c @@ -173,8 +173,8 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data, const AVPixFmtDescriptor *pix_fmt_desc = av_pix_fmt_desc_get(avctx->pix_fmt); - int sub_w = comp_index == 0 ? 1 : pix_fmt_desc->log2_chroma_w + 1; - int sub_h = comp_index == 0 ? 1 : pix_fmt_desc->log2_chroma_h + 1; + int sub_w_shift = comp_index == 0 ? 0 : pix_fmt_desc->log2_chroma_w; + int sub_h_shift = comp_index == 0 ? 0 : pix_fmt_desc->log2_chroma_h; APVRawTile *tile = &input->tile[tile_index]; @@ -190,8 +190,8 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data, int tile_mb_width = tile_width / APV_MB_WIDTH; int tile_mb_height = tile_height / APV_MB_HEIGHT; - int blk_mb_width = 2 / sub_w; - int blk_mb_height = 2 / sub_h; + int blk_mb_width = 2 >> sub_w_shift; + int blk_mb_height = 2 >> sub_h_shift; int bit_depth; int qp_shift; @@ -234,10 +234,10 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data, for (int blk_x = 0; blk_x < blk_mb_width; blk_x++) { int frame_y = (tile_start_y + APV_MB_HEIGHT * mb_y + - APV_TR_SIZE * blk_y) / sub_h; + APV_TR_SIZE * blk_y) >> sub_h_shift; int frame_x = (tile_start_x + APV_MB_WIDTH * mb_x + - APV_TR_SIZE * blk_x) / sub_w; + APV_TR_SIZE * blk_x) >> sub_w_shift; ptrdiff_t frame_pitch = apv->output_frame->linesize[comp_index]; uint8_t *block_start = apv->output_frame->data[comp_index] + |