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Adding unit tests to validate FFmpegReader, Clip, and Timeline frame accuracy of GIF files, plus GIF with time curves.

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This commit is contained in:
Jonathan Thomas
2025-09-12 22:57:26 -05:00
parent fa4f44d108
commit 021c6ecc07
3 changed files with 157 additions and 0 deletions
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examples/animation.gif Normal file
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127
tests/Clip.cpp
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@@ -12,6 +12,7 @@
#include <sstream>
#include <memory>
#include <set>
#include "openshot_catch.h"
@@ -226,6 +227,132 @@ TEST_CASE( "effects", "[libopenshot][clip]" )
CHECK((int)c10.Effects().size() == 2);
}
TEST_CASE( "GIF_clip_properties", "[libopenshot][clip][gif]" )
{
std::stringstream path;
path << TEST_MEDIA_PATH << "animation.gif";
Clip c(path.str());
c.Open();
FFmpegReader *r = dynamic_cast<FFmpegReader*>(c.Reader());
REQUIRE(r != nullptr);
CHECK(r->info.video_length == 20);
CHECK(r->info.fps.num == 5);
CHECK(r->info.fps.den == 1);
CHECK(r->info.duration == Approx(4.0f).margin(0.01));
c.Close();
}
TEST_CASE( "GIF_time_mapping", "[libopenshot][clip][gif]" )
{
std::stringstream path;
path << TEST_MEDIA_PATH << "animation.gif";
auto frame_color = [](std::shared_ptr<Frame> f) {
const unsigned char* row = f->GetPixels(25);
return row[25 * 4];
};
auto expected_color = [](int frame) {
return (frame - 1) * 10;
};
// Slow mapping: stretch 20 frames over 50 frames
Clip slow(path.str());
slow.time.AddPoint(1,1, LINEAR);
slow.time.AddPoint(50,20, LINEAR);
slow.Open();
std::set<int> slow_colors;
for (int i = 1; i <= 50; ++i) {
int src = slow.time.GetLong(i);
int c = frame_color(slow.GetFrame(i));
CHECK(c == expected_color(src));
slow_colors.insert(c);
}
CHECK((int)slow_colors.size() == 20);
slow.Close();
// Fast mapping: shrink 20 frames to 10 frames
Clip fast(path.str());
fast.time.AddPoint(1,1, LINEAR);
fast.time.AddPoint(10,20, LINEAR);
fast.Open();
std::set<int> fast_colors;
for (int i = 1; i <= 10; ++i) {
int src = fast.time.GetLong(i);
int c = frame_color(fast.GetFrame(i));
CHECK(c == expected_color(src));
fast_colors.insert(c);
}
CHECK((int)fast_colors.size() == 10);
fast.Close();
}
TEST_CASE( "GIF_timeline_mapping", "[libopenshot][clip][gif]" )
{
// Create a timeline
Timeline t1(50, 50, Fraction(5, 1), 44100, 2, LAYOUT_STEREO);
std::stringstream path;
path << TEST_MEDIA_PATH << "animation.gif";
auto frame_color = [](std::shared_ptr<Frame> f) {
const unsigned char* row = f->GetPixels(25);
return row[25 * 4];
};
auto expected_color = [](int frame) {
return (frame - 1) * 10;
};
// Slow mapping: stretch 20 frames over 50 frames
Clip slow(path.str());
slow.Position(0.0);
slow.Layer(1);
slow.time.AddPoint(1,1, LINEAR);
slow.time.AddPoint(50,20, LINEAR);
slow.End(10.0);
t1.AddClip(&slow);
t1.Open();
std::set<int> slow_colors;
for (int i = 1; i <= 50; ++i) {
int src = slow.time.GetLong(i);
std::stringstream frame_save;
t1.GetFrame(i)->Save(frame_save.str(), 1.0, "PNG", 100);
int c = frame_color(t1.GetFrame(i));
std::cout << c << std::endl;
CHECK(c == expected_color(src));
slow_colors.insert(c);
}
CHECK((int)slow_colors.size() == 20);
t1.Close();
// Create a timeline
Timeline t2(50, 50, Fraction(5, 1), 44100, 2, LAYOUT_STEREO);
// Fast mapping: shrink 20 frames to 10 frames
Clip fast(path.str());
fast.Position(0.0);
fast.Layer(1);
fast.time.AddPoint(1,1, LINEAR);
fast.time.AddPoint(10,20, LINEAR);
fast.End(2.0);
t2.AddClip(&fast);
t2.Open();
std::set<int> fast_colors;
for (int i = 1; i <= 10; ++i) {
int src = fast.time.GetLong(i);
int c = frame_color(t2.GetFrame(i));
CHECK(c == expected_color(src));
fast_colors.insert(c);
}
CHECK((int)fast_colors.size() == 10);
t2.Close();
}
TEST_CASE( "verify parent Timeline", "[libopenshot][clip]" )
{
Timeline t1(640, 480, Fraction(30,1), 44100, 2, LAYOUT_STEREO);

30
tests/FFmpegReader.cpp
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@@ -12,6 +12,7 @@
#include <sstream>
#include <memory>
#include <set>
#include "openshot_catch.h"
@@ -189,6 +190,35 @@ TEST_CASE( "Frame_Rate", "[libopenshot][ffmpegreader]" )
r.Close();
}
TEST_CASE( "GIF_TimeBase", "[libopenshot][ffmpegreader]" )
{
// Create a reader
std::stringstream path;
path << TEST_MEDIA_PATH << "animation.gif";
FFmpegReader r(path.str());
r.Open();
// Verify basic info
CHECK(r.info.fps.num == 5);
CHECK(r.info.fps.den == 1);
CHECK(r.info.video_length == 20);
CHECK(r.info.duration == Approx(4.0f).margin(0.01));
auto frame_color = [](std::shared_ptr<Frame> f) {
const unsigned char* row = f->GetPixels(25);
return row[25 * 4];
};
auto expected_color = [](int frame) {
return (frame - 1) * 10;
};
for (int i = 1; i <= r.info.video_length; ++i) {
CHECK(frame_color(r.GetFrame(i)) == expected_color(i));
}
r.Close();
}
TEST_CASE( "Multiple_Open_and_Close", "[libopenshot][ffmpegreader]" )
{
// Create a reader