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avfilter/buffersrc: add alpha_mode parameter

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This commit is contained in:
Niklas Haas
2025-08-13 14:10:24 +02:00
parent 0fbd90d78f
commit de297ae2fc
5 changed files with 48 additions and 10 deletions
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3
doc/APIchanges
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@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
API changes, most recent first:
2025-09-xx - xxxxxxxxxx - lavfi 11.8.100 - buffersrc.h
Add AVBufferSrcParameters.alpha_mode.
2025-09-xx - xxxxxxxxxx - lavfi 11.7.100 - buffersink.h
Add av_buffersink_get_alpha_mode().

5
doc/filters.texi
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@@ -29278,6 +29278,11 @@ A string representing the color range of the buffered video frames.
It may be a number corresponding to a color range, or a color range
name.
@item alpha_mode
A string representing the alpha mode of the buffered video frames.
It may be a number corresponding to an alpha mode, or an alpha mode
name.
@item pixel_aspect, sar
The sample (pixel) aspect ratio of the input video.

43
libavfilter/buffersrc.c
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@@ -52,6 +52,7 @@ typedef struct BufferSourceContext {
enum AVPixelFormat pix_fmt, prev_pix_fmt;
enum AVColorSpace color_space, prev_color_space;
enum AVColorRange color_range, prev_color_range;
enum AVAlphaMode alpha_mode, prev_alpha_mode;
AVRational pixel_aspect;
AVBufferRef *hw_frames_ctx;
@@ -69,17 +70,17 @@ typedef struct BufferSourceContext {
int link_delta, prev_delta;
} BufferSourceContext;
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, alpha, pts)\
c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
c->color_space != csp || c->color_range != range;\
c->color_space != csp || c->color_range != range || c->alpha_mode != alpha;\
c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
c->prev_color_space != csp || c->prev_color_range != range;\
c->prev_color_space != csp || c->prev_color_range != range || c->prev_alpha_mode != alpha;\
if (c->link_delta) {\
int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
width, height, format, av_color_space_name(csp), av_color_range_name(range),\
av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s alpha: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s alpha: %s pts_time: %s\n",\
c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range), av_alpha_mode_name(c->alpha_mode),\
width, height, format, av_color_space_name(csp), av_color_range_name(range), av_alpha_mode_name(alpha),\
av_ts2timestr(pts, &s->outputs[0]->time_base));\
}\
if (c->prev_delta) {\
@@ -90,6 +91,7 @@ typedef struct BufferSourceContext {
c->prev_pix_fmt = format;\
c->prev_color_space = csp;\
c->prev_color_range = range;\
c->prev_alpha_mode = alpha;\
}
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
@@ -111,6 +113,7 @@ AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
par->format = -1;
par->color_range = AVCOL_RANGE_UNSPECIFIED;
par->color_space = AVCOL_SPC_UNSPECIFIED;
par->alpha_mode = AVALPHA_MODE_UNSPECIFIED;
return par;
}
@@ -145,6 +148,8 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
s->color_space = s->prev_color_space = param->color_space;
if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
s->color_range = s->prev_color_range = param->color_range;
if (param->alpha_mode != AVALPHA_MODE_UNSPECIFIED)
s->alpha_mode = s->prev_alpha_mode = param->alpha_mode;
break;
case AVMEDIA_TYPE_AUDIO:
if (param->format != AV_SAMPLE_FMT_NONE) {
@@ -224,7 +229,7 @@ int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFra
case AVMEDIA_TYPE_VIDEO:
CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
frame->format, frame->colorspace,
frame->color_range, frame->pts);
frame->color_range, frame->alpha_mode, frame->pts);
break;
case AVMEDIA_TYPE_AUDIO:
/* For layouts unknown on input but known on link after negotiation. */
@@ -256,6 +261,8 @@ int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFra
copy->colorspace = ctx->outputs[0]->colorspace;
if (copy->color_range == AVCOL_RANGE_UNSPECIFIED)
copy->color_range = ctx->outputs[0]->color_range;
if (copy->alpha_mode == AVALPHA_MODE_UNSPECIFIED)
copy->alpha_mode = ctx->outputs[0]->alpha_mode;
ret = ff_filter_frame(ctx->outputs[0], copy);
if (ret < 0)
@@ -303,11 +310,12 @@ static av_cold int init_video(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d csp:%s range:%s\n",
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d csp:%s range:%s alpha:%s\n",
c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
c->pixel_aspect.num, c->pixel_aspect.den,
av_color_space_name(c->color_space), av_color_range_name(c->color_range));
av_color_space_name(c->color_space), av_color_range_name(c->color_range),
av_alpha_mode_name(c->alpha_mode));
return 0;
}
@@ -357,6 +365,11 @@ static const AVOption buffer_options[] = {
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ "alpha_mode", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=AVALPHA_MODE_UNSPECIFIED}, 0, AVCOL_RANGE_NB-1, V, .unit = "alpha"},
{ "unspecified", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVALPHA_MODE_UNSPECIFIED}, 0, 0, V, .unit = "alpha"},
{ "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVALPHA_MODE_UNSPECIFIED}, 0, 0, V, .unit = "alpha"},
{ "straight", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVALPHA_MODE_STRAIGHT}, 0, 0, V, .unit = "alpha"},
{ "premultiplied", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVALPHA_MODE_PREMULTIPLIED}, 0, 0, V, .unit = "alpha"},
{ NULL },
};
@@ -442,6 +455,7 @@ static int query_formats(const AVFilterContext *ctx,
AVFilterFormats *samplerates = NULL;
AVFilterFormats *color_spaces = NULL;
AVFilterFormats *color_ranges = NULL;
AVFilterFormats *alpha_modes = NULL;
int ret;
switch (ctx->outputs[0]->type) {
@@ -472,6 +486,17 @@ static int query_formats(const AVFilterContext *ctx,
if ((ret = ff_set_common_color_ranges2(ctx, cfg_in, cfg_out, color_ranges)) < 0)
return ret;
}
if (av_pix_fmt_desc_get(swfmt)->flags & AV_PIX_FMT_FLAG_ALPHA) {
if ((ret = ff_add_format(&alpha_modes, c->alpha_mode)) < 0)
return ret;
if (c->alpha_mode == AVALPHA_MODE_UNSPECIFIED) {
/* allow implicitly promoting unspecified to straight */
if ((ret = ff_add_format(&alpha_modes, AVALPHA_MODE_STRAIGHT)) < 0)
return ret;
}
if ((ret = ff_set_common_alpha_modes2(ctx, cfg_in, cfg_out, alpha_modes)) < 0)
return ret;
}
break;
}
case AVMEDIA_TYPE_AUDIO:

5
libavfilter/buffersrc.h
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@@ -123,6 +123,11 @@ typedef struct AVBufferSrcParameters {
AVFrameSideData **side_data;
int nb_side_data;
/**
* Video only, the alpha mode.
*/
enum AVAlphaMode alpha_mode;
} AVBufferSrcParameters;
/**

2
libavfilter/version.h
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@@ -31,7 +31,7 @@
#include "version_major.h"
#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MINOR 8
#define LIBAVFILTER_VERSION_MICRO 100