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Fixing the alignment of our FFmpegReader video buffers to be 32 / AVX2. This increases performance by a factor of 3X.

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This commit is contained in:
Jonathan Thomas
2025-06-04 18:37:46 -05:00
parent 6e73a23259
commit c487aa4389
2 changed files with 7 additions and 2 deletions
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8
src/FFmpegReader.cpp
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@@ -1568,8 +1568,12 @@ void FFmpegReader::ProcessVideoPacket(int64_t requested_frame) {
// Determine required buffer size and allocate buffer
const int bytes_per_pixel = 4;
int buffer_size = (width * height * bytes_per_pixel) + 128;
buffer = new unsigned char[buffer_size]();
int raw_buffer_size = (width * height * bytes_per_pixel) + 128;
// Aligned memory allocation (for speed)
constexpr size_t ALIGNMENT = 32; // AVX2
int buffer_size = ((raw_buffer_size + ALIGNMENT - 1) / ALIGNMENT) * ALIGNMENT;
buffer = (unsigned char*) aligned_alloc(ALIGNMENT, buffer_size);
// Copy picture data from one AVFrame (or AVPicture) to another one.
AV_COPY_PICTURE_DATA(pFrameRGB, buffer, PIX_FMT_RGBA, width, height);