Move memcpy_interleaved into its own file.

[nageru] / decklink_capture.cpp

diff --git a/decklink_capture.cpp b/decklink_capture.cpp
index 6507959251d08a82bec466f180949d4985bdc1f8..881e1817b1b7262f295584ac24e7f6d80fd1b65e 100644 (file)
--- a/decklink_capture.cpp
+++ b/decklink_capture.cpp
@@ -21,6 +21,7 @@
 #include "bmusb/bmusb.h"
 #include "decklink_util.h"
 #include "flags.h"
+#include "memcpy_interleaved.h"
 #include "v210_converter.h"
 
 #define FRAME_SIZE (8 << 20)  // 8 MB.
@@ -32,114 +33,6 @@ using namespace bmusb;
 
 namespace {
 
-// TODO: Support stride.
-void memcpy_interleaved(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size_t n)
-{
-       assert(n % 2 == 0);
-       uint8_t *dptr1 = dest1;
-       uint8_t *dptr2 = dest2;
-
-       for (size_t i = 0; i < n; i += 2) {
-               *dptr1++ = *src++;
-               *dptr2++ = *src++;
-       }
-}
-
-#ifdef __SSE2__
-
-// Returns the number of bytes consumed.
-size_t memcpy_interleaved_fastpath(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size_t n)
-{
-       const uint8_t *limit = src + n;
-       size_t consumed = 0;
-
-       // Align end to 32 bytes.
-       limit = (const uint8_t *)(intptr_t(limit) & ~31);
-
-       if (src >= limit) {
-               return 0;
-       }
-
-       // Process [0,31] bytes, such that start gets aligned to 32 bytes.
-       const uint8_t *aligned_src = (const uint8_t *)(intptr_t(src + 31) & ~31);
-       if (aligned_src != src) {
-               size_t n2 = aligned_src - src;
-               memcpy_interleaved(dest1, dest2, src, n2);
-               dest1 += n2 / 2;
-               dest2 += n2 / 2;
-               if (n2 % 2) {
-                       swap(dest1, dest2);
-               }
-               src = aligned_src;
-               consumed += n2;
-       }
-
-       // Make the length a multiple of 64.
-       if (((limit - src) % 64) != 0) {
-               limit -= 32;
-       }
-       assert(((limit - src) % 64) == 0);
-
-#if __AVX2__
-       const __m256i * __restrict in = (const __m256i *)src;
-       __m256i * __restrict out1 = (__m256i *)dest1;
-       __m256i * __restrict out2 = (__m256i *)dest2;
-
-       __m256i shuffle_cw = _mm256_set_epi8(
-               15, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0,
-               15, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0);
-       while (in < (const __m256i *)limit) {
-               // Note: For brevity, comments show lanes as if they were 2x64-bit (they're actually 2x128).
-               __m256i data1 = _mm256_stream_load_si256(in);         // AaBbCcDd EeFfGgHh
-               __m256i data2 = _mm256_stream_load_si256(in + 1);     // IiJjKkLl MmNnOoPp
-
-               data1 = _mm256_shuffle_epi8(data1, shuffle_cw);       // ABCDabcd EFGHefgh
-               data2 = _mm256_shuffle_epi8(data2, shuffle_cw);       // IJKLijkl MNOPmnop
-       
-               data1 = _mm256_permute4x64_epi64(data1, 0b11011000);  // ABCDEFGH abcdefgh
-               data2 = _mm256_permute4x64_epi64(data2, 0b11011000);  // IJKLMNOP ijklmnop
-
-               __m256i lo = _mm256_permute2x128_si256(data1, data2, 0b00100000);
-               __m256i hi = _mm256_permute2x128_si256(data1, data2, 0b00110001);
-
-               _mm256_storeu_si256(out1, lo);
-               _mm256_storeu_si256(out2, hi);
-
-               in += 2;
-               ++out1;
-               ++out2;
-               consumed += 64;
-       }
-#else
-       const __m128i * __restrict in = (const __m128i *)src;
-       __m128i * __restrict out1 = (__m128i *)dest1;
-       __m128i * __restrict out2 = (__m128i *)dest2;
-
-       __m128i mask_lower_byte = _mm_set1_epi16(0x00ff);
-       while (in < (const __m128i *)limit) {
-               __m128i data1 = _mm_load_si128(in);
-               __m128i data2 = _mm_load_si128(in + 1);
-               __m128i data1_lo = _mm_and_si128(data1, mask_lower_byte);
-               __m128i data2_lo = _mm_and_si128(data2, mask_lower_byte);
-               __m128i data1_hi = _mm_srli_epi16(data1, 8);
-               __m128i data2_hi = _mm_srli_epi16(data2, 8);
-               __m128i lo = _mm_packus_epi16(data1_lo, data2_lo);
-               _mm_storeu_si128(out1, lo);
-               __m128i hi = _mm_packus_epi16(data1_hi, data2_hi);
-               _mm_storeu_si128(out2, hi);
-
-               in += 2;
-               ++out1;
-               ++out2;
-               consumed += 32;
-       }
-#endif
-
-       return consumed;
-}
-
-#endif  // __SSE2__
-
 BMDPixelFormat pixel_format_to_bmd(PixelFormat pixel_format)
 {
        switch (pixel_format) {
@@ -368,21 +261,7 @@ HRESULT STDMETHODCALLTYPE DeckLinkCapture::VideoInputFrameArrived(
                        if (current_video_frame.interleaved) {
                                uint8_t *data = current_video_frame.data;
                                uint8_t *data2 = current_video_frame.data2;
-#ifdef __SSE2__
-                               size_t consumed = memcpy_interleaved_fastpath(data, data2, frame_bytes, num_bytes);
-                               frame_bytes += consumed;
-                               data += consumed / 2;
-                               data2 += consumed / 2;
-                               if (num_bytes % 2) {
-                                       swap(data, data2);
-                               }
-                               current_video_frame.len += consumed;
-                               num_bytes -= consumed;
-#endif
-
-                               if (num_bytes > 0) {
-                                       memcpy_interleaved(data, data2, frame_bytes, num_bytes);
-                               }
+                               memcpy_interleaved(data, data2, frame_bytes, num_bytes);
                        } else {
                                memcpy(current_video_frame.data, frame_bytes, num_bytes);
                        }