* [FFmpeg-devel] [PATCH 1/5] libswscale: Re-factor ff_shuffle_filter_coefficients.
@ 2022-02-09 9:09 Alan Kelly
2022-02-16 21:21 ` Michael Niedermayer
0 siblings, 1 reply; 2+ messages in thread
From: Alan Kelly @ 2022-02-09 9:09 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: Alan Kelly
Make the code more readable and follow the style guide.
---
libswscale/utils.c | 64 +++++++++++++++++++++++++++-------------------
1 file changed, 37 insertions(+), 27 deletions(-)
diff --git a/libswscale/utils.c b/libswscale/utils.c
index c5ea8853d5..1d919e863a 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -278,39 +278,49 @@ static const FormatEntry format_entries[] = {
[AV_PIX_FMT_P416LE] = { 1, 1 },
};
-void ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos, int filterSize, int16_t *filter, int dstW){
+void ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos,
+ int filterSize, int16_t *filter,
+ int dstW)
+{
#if ARCH_X86_64
- int i, j, k, l;
+ int i, j, k;
int cpu_flags = av_get_cpu_flags();
+ // avx2 hscale filter processes 16 pixel blocks.
+ if (!filter || dstW % 16 != 0)
+ return;
if (EXTERNAL_AVX2_FAST(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_SLOW_GATHER)) {
- if ((c->srcBpc == 8) && (c->dstBpc <= 14)){
- if (dstW % 16 == 0){
- if (filter != NULL){
- for (i = 0; i < dstW; i += 8){
- FFSWAP(int, filterPos[i + 2], filterPos[i+4]);
- FFSWAP(int, filterPos[i + 3], filterPos[i+5]);
- }
- if (filterSize > 4){
- int16_t *tmp2 = av_malloc(dstW * filterSize * 2);
- memcpy(tmp2, filter, dstW * filterSize * 2);
- for (i = 0; i < dstW; i += 16){//pixel
- for (k = 0; k < filterSize / 4; ++k){//fcoeff
- for (j = 0; j < 16; ++j){//inner pixel
- for (l = 0; l < 4; ++l){//coeff
- int from = i * filterSize + j * filterSize + k * 4 + l;
- int to = (i) * filterSize + j * 4 + l + k * 64;
- filter[to] = tmp2[from];
- }
- }
- }
- }
- av_free(tmp2);
- }
- }
- }
+ if ((c->srcBpc == 8) && (c->dstBpc <= 14)) {
+ int16_t *filterCopy = NULL;
+ if (filterSize > 4) {
+ if (!FF_ALLOC_TYPED_ARRAY(filterCopy, dstW * filterSize))
+ return;
+ memcpy(filterCopy, filter, dstW * filterSize * sizeof(int16_t));
+ }
+ // Do not swap filterPos for pixels which won't be processed by
+ // the main loop.
+ for (i = 0; i + 8 <= dstW; i += 8) {
+ FFSWAP(int, filterPos[i + 2], filterPos[i + 4]);
+ FFSWAP(int, filterPos[i + 3], filterPos[i + 5]);
+ }
+ if (filterSize > 4) {
+ // 16 pixels are processed at a time.
+ for (i = 0; i + 16 <= dstW; i += 16) {
+ // 4 filter coeffs are processed at a time.
+ for (k = 0; k + 4 <= filterSize; k += 4) {
+ for (j = 0; j < 16; ++j) {
+ int from = (i + j) * filterSize + k;
+ int to = i * filterSize + j * 4 + k * 16;
+ memcpy(&filter[to], &filterCopy[from], 4 * sizeof(int16_t));
+ }
+ }
+ }
+ }
+ if (filterCopy)
+ av_free(filterCopy);
}
}
#endif
+ return;
}
int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
--
2.35.0.263.gb82422642f-goog
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [FFmpeg-devel] [PATCH 1/5] libswscale: Re-factor ff_shuffle_filter_coefficients.
2022-02-09 9:09 [FFmpeg-devel] [PATCH 1/5] libswscale: Re-factor ff_shuffle_filter_coefficients Alan Kelly
@ 2022-02-16 21:21 ` Michael Niedermayer
0 siblings, 0 replies; 2+ messages in thread
From: Michael Niedermayer @ 2022-02-16 21:21 UTC (permalink / raw)
To: FFmpeg development discussions and patches
[-- Attachment #1.1: Type: text/plain, Size: 4401 bytes --]
On Wed, Feb 09, 2022 at 10:09:45AM +0100, Alan Kelly wrote:
> Make the code more readable and follow the style guide.
> ---
> libswscale/utils.c | 64 +++++++++++++++++++++++++++-------------------
> 1 file changed, 37 insertions(+), 27 deletions(-)
>
> diff --git a/libswscale/utils.c b/libswscale/utils.c
> index c5ea8853d5..1d919e863a 100644
> --- a/libswscale/utils.c
> +++ b/libswscale/utils.c
> @@ -278,39 +278,49 @@ static const FormatEntry format_entries[] = {
> [AV_PIX_FMT_P416LE] = { 1, 1 },
> };
>
> -void ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos, int filterSize, int16_t *filter, int dstW){
> +void ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos,
> + int filterSize, int16_t *filter,
> + int dstW)
> +{
> #if ARCH_X86_64
> - int i, j, k, l;
> + int i, j, k;
> int cpu_flags = av_get_cpu_flags();
> + // avx2 hscale filter processes 16 pixel blocks.
> + if (!filter || dstW % 16 != 0)
> + return;
> if (EXTERNAL_AVX2_FAST(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_SLOW_GATHER)) {
> - if ((c->srcBpc == 8) && (c->dstBpc <= 14)){
> - if (dstW % 16 == 0){
> - if (filter != NULL){
> - for (i = 0; i < dstW; i += 8){
> - FFSWAP(int, filterPos[i + 2], filterPos[i+4]);
> - FFSWAP(int, filterPos[i + 3], filterPos[i+5]);
> - }
> - if (filterSize > 4){
> - int16_t *tmp2 = av_malloc(dstW * filterSize * 2);
> - memcpy(tmp2, filter, dstW * filterSize * 2);
> - for (i = 0; i < dstW; i += 16){//pixel
> - for (k = 0; k < filterSize / 4; ++k){//fcoeff
> - for (j = 0; j < 16; ++j){//inner pixel
> - for (l = 0; l < 4; ++l){//coeff
> - int from = i * filterSize + j * filterSize + k * 4 + l;
> - int to = (i) * filterSize + j * 4 + l + k * 64;
> - filter[to] = tmp2[from];
> - }
> - }
> - }
> - }
> - av_free(tmp2);
> - }
> - }
> - }
> + if ((c->srcBpc == 8) && (c->dstBpc <= 14)) {
> + int16_t *filterCopy = NULL;
> + if (filterSize > 4) {
> + if (!FF_ALLOC_TYPED_ARRAY(filterCopy, dstW * filterSize))
> + return;
this is not a matter of style, it changes a null pointer dereference on error
to simply returning with no error handling. I know the next patches
change this again but that makes it just more messy
> + memcpy(filterCopy, filter, dstW * filterSize * sizeof(int16_t));
> + }
> + // Do not swap filterPos for pixels which won't be processed by
> + // the main loop.
> + for (i = 0; i + 8 <= dstW; i += 8) {
> + FFSWAP(int, filterPos[i + 2], filterPos[i + 4]);
> + FFSWAP(int, filterPos[i + 3], filterPos[i + 5]);
> + }
> + if (filterSize > 4) {
> + // 16 pixels are processed at a time.
> + for (i = 0; i + 16 <= dstW; i += 16) {
> + // 4 filter coeffs are processed at a time.
> + for (k = 0; k + 4 <= filterSize; k += 4) {
> + for (j = 0; j < 16; ++j) {
> + int from = (i + j) * filterSize + k;
> + int to = i * filterSize + j * 4 + k * 16;
> + memcpy(&filter[to], &filterCopy[from], 4 * sizeof(int16_t));
> + }
> + }
> + }
> + }
> + if (filterCopy)
> + av_free(filterCopy);
The null check is unneeded
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Does the universe only have a finite lifespan? No, its going to go on
forever, its just that you wont like living in it. -- Hiranya Peiri
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2022-02-09 9:09 [FFmpeg-devel] [PATCH 1/5] libswscale: Re-factor ff_shuffle_filter_coefficients Alan Kelly
2022-02-16 21:21 ` Michael Niedermayer
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