1 #include "decklink_capture.h"
10 #include <immintrin.h>
13 #include <DeckLinkAPI.h>
14 #include <DeckLinkAPIConfiguration.h>
15 #include <DeckLinkAPIDiscovery.h>
16 #include <DeckLinkAPIModes.h>
17 #include "bmusb/bmusb.h"
19 #define FRAME_SIZE (8 << 20) // 8 MB.
22 using namespace std::placeholders;
26 // TODO: Support stride.
27 void memcpy_interleaved(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size_t n)
30 uint8_t *dptr1 = dest1;
31 uint8_t *dptr2 = dest2;
33 for (size_t i = 0; i < n; i += 2) {
41 // Returns the number of bytes consumed.
42 size_t memcpy_interleaved_fastpath(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size_t n)
44 const uint8_t *limit = src + n;
47 // Align end to 32 bytes.
48 limit = (const uint8_t *)(intptr_t(limit) & ~31);
54 // Process [0,31] bytes, such that start gets aligned to 32 bytes.
55 const uint8_t *aligned_src = (const uint8_t *)(intptr_t(src + 31) & ~31);
56 if (aligned_src != src) {
57 size_t n2 = aligned_src - src;
58 memcpy_interleaved(dest1, dest2, src, n2);
68 // Make the length a multiple of 64.
69 if (((limit - src) % 64) != 0) {
72 assert(((limit - src) % 64) == 0);
75 const __restrict __m256i *in = (const __m256i *)src;
76 __restrict __m256i *out1 = (__m256i *)dest1;
77 __restrict __m256i *out2 = (__m256i *)dest2;
79 __m256i shuffle_cw = _mm256_set_epi8(
80 15, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0,
81 15, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0);
82 while (in < (const __m256i *)limit) {
83 // Note: For brevity, comments show lanes as if they were 2x64-bit (they're actually 2x128).
84 __m256i data1 = _mm256_stream_load_si256(in); // AaBbCcDd EeFfGgHh
85 __m256i data2 = _mm256_stream_load_si256(in + 1); // IiJjKkLl MmNnOoPp
87 data1 = _mm256_shuffle_epi8(data1, shuffle_cw); // ABCDabcd EFGHefgh
88 data2 = _mm256_shuffle_epi8(data2, shuffle_cw); // IJKLijkl MNOPmnop
90 data1 = _mm256_permute4x64_epi64(data1, 0b11011000); // ABCDEFGH abcdefgh
91 data2 = _mm256_permute4x64_epi64(data2, 0b11011000); // IJKLMNOP ijklmnop
93 __m256i lo = _mm256_permute2x128_si256(data1, data2, 0b00100000);
94 __m256i hi = _mm256_permute2x128_si256(data1, data2, 0b00110001);
96 _mm256_storeu_si256(out1, lo);
97 _mm256_storeu_si256(out2, hi);
105 const __restrict __m128i *in = (const __m128i *)src;
106 __restrict __m128i *out1 = (__m128i *)dest1;
107 __restrict __m128i *out2 = (__m128i *)dest2;
109 __m128i mask_lower_byte = _mm_set1_epi16(0x00ff);
110 while (in < (const __m128i *)limit) {
111 __m128i data1 = _mm_load_si128(in);
112 __m128i data2 = _mm_load_si128(in + 1);
113 __m128i data1_lo = _mm_and_si128(data1, mask_lower_byte);
114 __m128i data2_lo = _mm_and_si128(data2, mask_lower_byte);
115 __m128i data1_hi = _mm_srli_epi16(data1, 8);
116 __m128i data2_hi = _mm_srli_epi16(data2, 8);
117 __m128i lo = _mm_packus_epi16(data1_lo, data2_lo);
118 _mm_storeu_si128(out1, lo);
119 __m128i hi = _mm_packus_epi16(data1_hi, data2_hi);
120 _mm_storeu_si128(out2, hi);
136 DeckLinkCapture::DeckLinkCapture(IDeckLink *card, int card_index)
139 const char *model_name;
141 if (card->GetModelName(&model_name) == S_OK) {
142 snprintf(buf, sizeof(buf), "Card %d: %s", card_index, model_name);
144 snprintf(buf, sizeof(buf), "Card %d: Unknown DeckLink card", card_index);
149 if (card->QueryInterface(IID_IDeckLinkInput, (void**)&input) != S_OK) {
150 fprintf(stderr, "Card %d has no inputs\n", card_index);
154 /* Set up the video and audio sources. */
155 IDeckLinkConfiguration *config;
156 if (card->QueryInterface(IID_IDeckLinkConfiguration, (void**)&config) != S_OK) {
157 fprintf(stderr, "Failed to get configuration interface for card %d\n", card_index);
161 if (config->SetInt(bmdDeckLinkConfigVideoInputConnection, bmdVideoConnectionHDMI) != S_OK) {
162 fprintf(stderr, "Failed to set video input connection for card %d\n", card_index);
166 if (config->SetInt(bmdDeckLinkConfigAudioInputConnection, bmdAudioConnectionEmbedded) != S_OK) {
167 fprintf(stderr, "Failed to set video input connection for card %d\n", card_index);
171 // TODO: Make the user mode selectable.
172 BMDDisplayModeSupport support;
173 IDeckLinkDisplayMode *display_mode;
174 if (input->DoesSupportVideoMode(bmdModeHD720p5994, bmdFormat8BitYUV, /*flags=*/0, &support, &display_mode)) {
175 fprintf(stderr, "Failed to query display mode for card %d\n", card_index);
179 if (support == bmdDisplayModeNotSupported) {
180 fprintf(stderr, "Card %d does not support display mode\n", card_index);
184 if (display_mode->GetFrameRate(&frame_duration, &time_scale) != S_OK) {
185 fprintf(stderr, "Could not get frame rate for card %d\n", card_index);
189 if (input->EnableVideoInput(bmdModeHD720p5994, bmdFormat8BitYUV, 0) != S_OK) {
190 fprintf(stderr, "Failed to set 720p59.94 connection for card %d\n", card_index);
194 if (input->EnableAudioInput(48000, bmdAudioSampleType32bitInteger, 2) != S_OK) {
195 fprintf(stderr, "Failed to enable audio input for card %d\n", card_index);
199 input->SetCallback(this);
202 DeckLinkCapture::~DeckLinkCapture()
204 if (has_dequeue_callbacks) {
205 dequeue_cleanup_callback();
209 HRESULT STDMETHODCALLTYPE DeckLinkCapture::QueryInterface(REFIID, LPVOID *)
211 return E_NOINTERFACE;
214 ULONG STDMETHODCALLTYPE DeckLinkCapture::AddRef(void)
216 return refcount.fetch_add(1) + 1;
219 ULONG STDMETHODCALLTYPE DeckLinkCapture::Release(void)
221 int new_ref = refcount.fetch_sub(1) - 1;
227 HRESULT STDMETHODCALLTYPE DeckLinkCapture::VideoInputFormatChanged(
228 BMDVideoInputFormatChangedEvents,
229 IDeckLinkDisplayMode* display_mode,
230 BMDDetectedVideoInputFormatFlags)
232 if (display_mode->GetFrameRate(&frame_duration, &time_scale) != S_OK) {
233 fprintf(stderr, "Could not get new frame rate\n");
239 HRESULT STDMETHODCALLTYPE DeckLinkCapture::VideoInputFrameArrived(
240 IDeckLinkVideoInputFrame *video_frame,
241 IDeckLinkAudioInputPacket *audio_frame)
244 if (has_dequeue_callbacks) {
245 dequeue_init_callback();
250 FrameAllocator::Frame current_video_frame, current_audio_frame;
251 VideoFormat video_format;
252 AudioFormat audio_format;
255 video_format.has_signal = !(video_frame->GetFlags() & bmdFrameHasNoInputSource);
257 int width = video_frame->GetWidth();
258 int height = video_frame->GetHeight();
259 const int stride = video_frame->GetRowBytes();
260 assert(stride == width * 2);
262 current_video_frame = video_frame_allocator->alloc_frame();
263 if (current_video_frame.data != nullptr) {
264 const uint8_t *frame_bytes;
265 video_frame->GetBytes((void **)&frame_bytes);
267 uint8_t *data = current_video_frame.data;
268 uint8_t *data2 = current_video_frame.data2;
269 size_t num_bytes = width * height * 2;
271 size_t consumed = memcpy_interleaved_fastpath(data, data2, frame_bytes, num_bytes);
272 frame_bytes += consumed;
273 data += consumed / 2;
274 data2 += consumed / 2;
278 current_video_frame.len += consumed;
279 num_bytes -= consumed;
283 memcpy_interleaved(data, data2, frame_bytes, num_bytes);
285 current_video_frame.len += num_bytes;
287 video_format.width = width;
288 video_format.height = height;
289 video_format.frame_rate_nom = time_scale;
290 video_format.frame_rate_den = frame_duration;
295 int num_samples = audio_frame->GetSampleFrameCount();
297 current_audio_frame = audio_frame_allocator->alloc_frame();
298 if (current_audio_frame.data != nullptr) {
299 const uint8_t *frame_bytes;
300 audio_frame->GetBytes((void **)&frame_bytes);
301 current_audio_frame.len = sizeof(int32_t) * 2 * num_samples;
303 memcpy(current_audio_frame.data, frame_bytes, current_audio_frame.len);
305 audio_format.bits_per_sample = 32;
306 audio_format.num_channels = 2;
310 if (current_video_frame.data != nullptr || current_audio_frame.data != nullptr) {
311 // TODO: Put into a queue and put into a dequeue thread, if the
312 // BlackMagic drivers don't already do that for us?
313 frame_callback(timecode,
314 current_video_frame, /*video_offset=*/0, video_format,
315 current_audio_frame, /*audio_offset=*/0, audio_format);
322 void DeckLinkCapture::configure_card()
324 if (video_frame_allocator == nullptr) {
325 set_video_frame_allocator(new MallocFrameAllocator(FRAME_SIZE, NUM_QUEUED_VIDEO_FRAMES)); // FIXME: leak.
327 if (audio_frame_allocator == nullptr) {
328 set_audio_frame_allocator(new MallocFrameAllocator(65536, NUM_QUEUED_AUDIO_FRAMES)); // FIXME: leak.
332 void DeckLinkCapture::start_bm_capture()
334 if (input->StartStreams() != S_OK) {
335 fprintf(stderr, "StartStreams failed\n");
340 void DeckLinkCapture::stop_dequeue_thread()
342 if (input->StopStreams() != S_OK) {
343 fprintf(stderr, "StopStreams failed\n");