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vf_scale: libswscale is being stupid 

This time (there are a lot of times), libswscale randomly ignores
brightness/saturation/contrast settings.

Looking at MPlayer code, it appears the return value of
sws_setColorspaceDetails() signals if changing these settings is
supported at all.

(Nevermind that supporting this feature has almost 0 value, and
obviously eats maintenance time.)
This commit is contained in:
wm4 2015-03-01 22:31:35 +01:00
parent 1bbf1eb3ce
commit 08199a64d2
2 changed files with 10 additions and 3 deletions
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12
video/sws_utils.c
View File

@ -238,9 +238,11 @@ int mp_sws_reinit(struct mp_sws_context *ctx)
// This can fail even with normal operation, e.g. if a conversion path
// simply does not support these settings.
sws_setColorspaceDetails(ctx->sws, sws_getCoefficients(s_csp), s_range,
sws_getCoefficients(d_csp), d_range,
ctx->brightness, ctx->contrast, ctx->saturation);
int r =
sws_setColorspaceDetails(ctx->sws, sws_getCoefficients(s_csp), s_range,
sws_getCoefficients(d_csp), d_range,
ctx->brightness, ctx->contrast, ctx->saturation);
ctx->supports_csp = r >= 0;
if (sws_init_context(ctx->sws, ctx->src_filter, ctx->dst_filter) < 0)
return -1;
@ -294,6 +296,8 @@ int mp_image_sw_blur_scale(struct mp_image *dst, struct mp_image *src,
int mp_sws_get_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
{
if (!sws->supports_csp)
return 0;
if (!strcmp(eq->item, "brightness"))
eq->value = ((sws->brightness * 100) + (1 << 15)) >> 16;
else if (!strcmp(eq->item, "contrast"))
@ -307,6 +311,8 @@ int mp_sws_get_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
int mp_sws_set_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
{
if (!sws->supports_csp)
return 0;
if (!strcmp(eq->item, "brightness"))
sws->brightness = ((eq->value << 16) + 50) / 100;
else if (!strcmp(eq->item, "contrast"))

1
video/sws_utils.h
View File

@ -44,6 +44,7 @@ struct mp_sws_context {
// Cached context (if any)
struct SwsContext *sws;
bool supports_csp;
// Contains parameters for which sws is valid
struct mp_sws_context *cached;