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avisynth: more intelligent RGB flipping

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avs_is_color_space provides a generic way of checking whether the
video is RGB, and has been available through AVSC_API since 2.6.
This means that GetProcAddress doesn't have to run on every frame.

Signed-off-by: Stephen Hutchinson <qyot27@gmail.com>
This commit is contained in:
Stephen Hutchinson 2020-04-07 19:47:43 -04:00
parent 9f1b808bde
commit 4c40686ee2
1 changed files with 5 additions and 22 deletions
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27
libavformat/avisynth.c
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@ -57,6 +57,7 @@ typedef struct AviSynthLibrary {
AVSC_DECLARE_FUNC(avs_get_version);
AVSC_DECLARE_FUNC(avs_get_video_info);
AVSC_DECLARE_FUNC(avs_invoke);
AVSC_DECLARE_FUNC(avs_is_color_space);
AVSC_DECLARE_FUNC(avs_release_clip);
AVSC_DECLARE_FUNC(avs_release_value);
AVSC_DECLARE_FUNC(avs_release_video_frame);
@ -133,6 +134,7 @@ static av_cold int avisynth_load_library(void)
LOAD_AVS_FUNC(avs_get_version, 0);
LOAD_AVS_FUNC(avs_get_video_info, 0);
LOAD_AVS_FUNC(avs_invoke, 0);
LOAD_AVS_FUNC(avs_is_color_space, 1);
LOAD_AVS_FUNC(avs_release_clip, 0);
LOAD_AVS_FUNC(avs_release_value, 0);
LOAD_AVS_FUNC(avs_release_video_frame, 0);
@ -628,7 +630,6 @@ static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
const unsigned char *src_p;
int n, i, plane, rowsize, planeheight, pitch, bits, ret;
const char *error;
int avsplus av_unused;
if (avs->curr_frame >= avs->vi->num_frames)
return AVERROR_EOF;
@ -638,19 +639,6 @@ static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
if (discard)
return 0;
#ifdef _WIN32
/* Detect whether we're using AviSynth 2.6 or AviSynth+ by
* looking for whether avs_is_planar_rgb exists. */
if (GetProcAddress(avs_library.library, "avs_is_planar_rgb") == NULL)
avsplus = 0;
else
avsplus = 1;
#else
/* AviSynth+ is now the only variant of AviSynth we support
* on Linux and macOS. */
avsplus = 1;
#endif
bits = avs_library.avs_bits_per_pixel(avs->vi);
/* Without the cast to int64_t, calculation overflows at about 9k x 9k
@ -687,14 +675,9 @@ static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
planeheight = avs_library.avs_get_height_p(frame, plane);
/* Flip RGB video. */
if (avs_is_rgb24(avs->vi) || avs_is_rgb(avs->vi)) {
src_p = src_p + (planeheight - 1) * pitch;
pitch = -pitch;
}
/* Flip Planar RGB video */
if (avsplus && (avs_library.avs_is_planar_rgb(avs->vi) ||
avs_library.avs_is_planar_rgba(avs->vi))) {
if (avs_library.avs_is_color_space(avs->vi, AVS_CS_BGR) ||
avs_library.avs_is_color_space(avs->vi, AVS_CS_BGR48) ||
avs_library.avs_is_color_space(avs->vi, AVS_CS_BGR64)) {
src_p = src_p + (planeheight - 1) * pitch;
pitch = -pitch;
}