1 #include "mjpeg_encoder.h"
12 #include <libavformat/avformat.h>
16 #include "shared/ffmpeg_raii.h"
18 #include "shared/httpd.h"
19 #include "shared/memcpy_interleaved.h"
20 #include "shared/metrics.h"
21 #include "pbo_frame_allocator.h"
22 #include "shared/timebase.h"
23 #include "va_display_with_cleanup.h"
25 #include <movit/colorspace_conversion_effect.h>
28 #include <va/va_drm.h>
29 #include <va/va_x11.h>
31 using namespace Eigen;
32 using namespace bmusb;
33 using namespace movit;
36 static VAImageFormat uyvy_format, nv12_format;
38 extern void memcpy_with_pitch(uint8_t *dst, const uint8_t *src, size_t src_width, size_t dst_pitch, size_t height);
40 // The inverse of memcpy_interleaved(), with (slow) support for pitch.
41 void interleave_with_pitch(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, size_t src_width, size_t dst_pitch, size_t height)
44 if (dst_pitch == src_width * 2 && (src_width * height) % 16 == 0) {
45 __m128i *dptr = reinterpret_cast<__m128i *>(dst);
46 const __m128i *sptr1 = reinterpret_cast<const __m128i *>(src1);
47 const __m128i *sptr2 = reinterpret_cast<const __m128i *>(src2);
48 for (size_t i = 0; i < src_width * height / 16; ++i) {
49 __m128i data1 = _mm_loadu_si128(sptr1++);
50 __m128i data2 = _mm_loadu_si128(sptr2++);
51 _mm_storeu_si128(dptr++, _mm_unpacklo_epi8(data1, data2));
52 _mm_storeu_si128(dptr++, _mm_unpackhi_epi8(data1, data2));
58 for (size_t y = 0; y < height; ++y) {
59 uint8_t *dptr = dst + y * dst_pitch;
60 const uint8_t *sptr1 = src1 + y * src_width;
61 const uint8_t *sptr2 = src2 + y * src_width;
62 for (size_t x = 0; x < src_width; ++x) {
69 // From libjpeg (although it's of course identical between implementations).
70 static const int jpeg_natural_order[DCTSIZE2] = {
71 0, 1, 8, 16, 9, 2, 3, 10,
72 17, 24, 32, 25, 18, 11, 4, 5,
73 12, 19, 26, 33, 40, 48, 41, 34,
74 27, 20, 13, 6, 7, 14, 21, 28,
75 35, 42, 49, 56, 57, 50, 43, 36,
76 29, 22, 15, 23, 30, 37, 44, 51,
77 58, 59, 52, 45, 38, 31, 39, 46,
78 53, 60, 61, 54, 47, 55, 62, 63,
81 struct VectorDestinationManager {
82 jpeg_destination_mgr pub;
83 std::vector<uint8_t> dest;
85 VectorDestinationManager()
87 pub.init_destination = init_destination_thunk;
88 pub.empty_output_buffer = empty_output_buffer_thunk;
89 pub.term_destination = term_destination_thunk;
92 static void init_destination_thunk(j_compress_ptr ptr)
94 ((VectorDestinationManager *)(ptr->dest))->init_destination();
97 inline void init_destination()
102 static boolean empty_output_buffer_thunk(j_compress_ptr ptr)
104 return ((VectorDestinationManager *)(ptr->dest))->empty_output_buffer();
107 inline bool empty_output_buffer()
109 make_room(dest.size()); // Should ignore pub.free_in_buffer!
113 inline void make_room(size_t bytes_used)
115 dest.resize(bytes_used + 4096);
116 dest.resize(dest.capacity());
117 pub.next_output_byte = dest.data() + bytes_used;
118 pub.free_in_buffer = dest.size() - bytes_used;
121 static void term_destination_thunk(j_compress_ptr ptr)
123 ((VectorDestinationManager *)(ptr->dest))->term_destination();
126 inline void term_destination()
128 dest.resize(dest.size() - pub.free_in_buffer);
131 static_assert(std::is_standard_layout<VectorDestinationManager>::value, "");
133 int MJPEGEncoder::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
135 WritePacket2Context *ctx = (WritePacket2Context *)opaque;
136 return ctx->mjpeg_encoder->write_packet2(ctx->stream_id, buf, buf_size, type, time);
139 int MJPEGEncoder::write_packet2(HTTPD::StreamID stream_id, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
141 string *mux_header = &streams[stream_id].mux_header;
142 if (type == AVIO_DATA_MARKER_HEADER) {
143 mux_header->append((char *)buf, buf_size);
144 httpd->set_header(stream_id, *mux_header);
146 httpd->add_data(stream_id, (char *)buf, buf_size, /*keyframe=*/true, AV_NOPTS_VALUE, AVRational{ AV_TIME_BASE, 1 });
153 void add_video_stream(AVFormatContext *avctx)
155 AVStream *stream = avformat_new_stream(avctx, nullptr);
156 if (stream == nullptr) {
157 fprintf(stderr, "avformat_new_stream() failed\n");
161 // FFmpeg is very picky about having audio at 1/48000 timebase,
162 // no matter what we write. Even though we'd prefer our usual 1/120000,
163 // put the video on the same one, so that we can have locked audio.
164 stream->time_base = AVRational{ 1, OUTPUT_FREQUENCY };
165 stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
166 stream->codecpar->codec_id = AV_CODEC_ID_MJPEG;
168 // Used for aspect ratio only. Can change without notice (the mux won't care).
169 stream->codecpar->width = global_flags.width;
170 stream->codecpar->height = global_flags.height;
172 // TODO: We could perhaps use the interpretation for each card here
173 // (or at least the command-line flags) instead of the defaults,
174 // but what would we do when they change?
175 stream->codecpar->color_primaries = AVCOL_PRI_BT709;
176 stream->codecpar->color_trc = AVCOL_TRC_IEC61966_2_1;
177 stream->codecpar->color_space = AVCOL_SPC_BT709;
178 stream->codecpar->color_range = AVCOL_RANGE_MPEG;
179 stream->codecpar->chroma_location = AVCHROMA_LOC_LEFT;
180 stream->codecpar->field_order = AV_FIELD_PROGRESSIVE;
183 void add_audio_stream(AVFormatContext *avctx)
185 AVStream *stream = avformat_new_stream(avctx, nullptr);
186 if (stream == nullptr) {
187 fprintf(stderr, "avformat_new_stream() failed\n");
190 stream->time_base = AVRational{ 1, OUTPUT_FREQUENCY };
191 stream->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
192 stream->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
193 stream->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
194 stream->codecpar->channels = 2;
195 stream->codecpar->sample_rate = OUTPUT_FREQUENCY;
198 void finalize_mux(AVFormatContext *avctx)
200 AVDictionary *options = NULL;
201 vector<pair<string, string>> opts = MUX_OPTS;
202 for (pair<string, string> opt : opts) {
203 av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
205 if (avformat_write_header(avctx, &options) < 0) {
206 fprintf(stderr, "avformat_write_header() failed\n");
213 MJPEGEncoder::MJPEGEncoder(HTTPD *httpd, const string &va_display)
216 create_ffmpeg_context(HTTPD::StreamID{ HTTPD::MULTICAM_STREAM, 0 });
217 for (unsigned stream_idx = 0; stream_idx < MAX_VIDEO_CARDS; ++stream_idx) {
218 create_ffmpeg_context(HTTPD::StreamID{ HTTPD::SIPHON_STREAM, stream_idx });
221 add_stream(HTTPD::StreamID{ HTTPD::MULTICAM_STREAM, 0 });
223 // Initialize VA-API.
225 va_dpy = try_open_va(va_display, &error, &config_id_422, &config_id_420);
226 if (va_dpy == nullptr) {
227 fprintf(stderr, "Could not initialize VA-API for MJPEG encoding: %s. JPEGs will be encoded in software if needed.\n", error.c_str());
230 encoder_thread = thread(&MJPEGEncoder::encoder_thread_func, this);
231 if (va_dpy != nullptr) {
232 va_receiver_thread = thread(&MJPEGEncoder::va_receiver_thread_func, this);
235 global_metrics.add("mjpeg_frames", {{ "status", "dropped" }, { "reason", "zero_size" }}, &metric_mjpeg_frames_zero_size_dropped);
236 global_metrics.add("mjpeg_frames", {{ "status", "dropped" }, { "reason", "interlaced" }}, &metric_mjpeg_frames_interlaced_dropped);
237 global_metrics.add("mjpeg_frames", {{ "status", "dropped" }, { "reason", "unsupported_pixel_format" }}, &metric_mjpeg_frames_unsupported_pixel_format_dropped);
238 global_metrics.add("mjpeg_frames", {{ "status", "dropped" }, { "reason", "oversized" }}, &metric_mjpeg_frames_oversized_dropped);
239 global_metrics.add("mjpeg_frames", {{ "status", "dropped" }, { "reason", "overrun" }}, &metric_mjpeg_overrun_dropped);
240 global_metrics.add("mjpeg_frames", {{ "status", "submitted" }}, &metric_mjpeg_overrun_submitted);
245 MJPEGEncoder::~MJPEGEncoder()
247 for (auto &id_and_stream : streams) {
248 av_free(id_and_stream.second.avctx->pb->buffer);
251 global_metrics.remove("mjpeg_frames", {{ "status", "dropped" }, { "reason", "zero_size" }});
252 global_metrics.remove("mjpeg_frames", {{ "status", "dropped" }, { "reason", "interlaced" }});
253 global_metrics.remove("mjpeg_frames", {{ "status", "dropped" }, { "reason", "unsupported_pixel_format" }});
254 global_metrics.remove("mjpeg_frames", {{ "status", "dropped" }, { "reason", "oversized" }});
255 global_metrics.remove("mjpeg_frames", {{ "status", "dropped" }, { "reason", "overrun" }});
256 global_metrics.remove("mjpeg_frames", {{ "status", "submitted" }});
259 void MJPEGEncoder::stop()
266 any_frames_to_be_encoded.notify_all();
267 any_frames_encoding.notify_all();
268 encoder_thread.join();
269 if (va_dpy != nullptr) {
270 va_receiver_thread.join();
274 unique_ptr<VADisplayWithCleanup> MJPEGEncoder::try_open_va(const string &va_display, string *error, VAConfigID *config_id_422, VAConfigID *config_id_420)
276 unique_ptr<VADisplayWithCleanup> va_dpy = va_open_display(va_display);
277 if (va_dpy == nullptr) {
278 if (error) *error = "Opening VA display failed";
281 int major_ver, minor_ver;
282 VAStatus va_status = vaInitialize(va_dpy->va_dpy, &major_ver, &minor_ver);
283 if (va_status != VA_STATUS_SUCCESS) {
285 snprintf(buf, sizeof(buf), "vaInitialize() failed with status %d\n", va_status);
286 if (error != nullptr) *error = buf;
291 VAConfigAttrib attr = { VAConfigAttribRTFormat, VA_RT_FORMAT_YUV422 };
292 va_status = vaCreateConfig(va_dpy->va_dpy, VAProfileJPEGBaseline, VAEntrypointEncPicture,
293 &attr, 1, config_id_422);
294 if (va_status == VA_STATUS_ERROR_UNSUPPORTED_ENTRYPOINT) {
295 if (error != nullptr) *error = "No 4:2:2 hardware support";
297 } else if (va_status != VA_STATUS_SUCCESS) {
299 snprintf(buf, sizeof(buf), "vaCreateConfig() for 4:2:2 failed with status %d\n", va_status);
300 if (error != nullptr) *error = buf;
305 VAConfigAttrib attr = { VAConfigAttribRTFormat, VA_RT_FORMAT_YUV420 };
306 va_status = vaCreateConfig(va_dpy->va_dpy, VAProfileJPEGBaseline, VAEntrypointEncPicture,
307 &attr, 1, config_id_420);
308 if (va_status == VA_STATUS_ERROR_UNSUPPORTED_ENTRYPOINT) {
309 if (error != nullptr) *error = "No 4:2:0 hardware support";
311 } else if (va_status != VA_STATUS_SUCCESS) {
313 snprintf(buf, sizeof(buf), "vaCreateConfig() for 4:2:0 failed with status %d\n", va_status);
314 if (error != nullptr) *error = buf;
319 // TODO: Unify with the code in Futatabi.
320 int num_formats = vaMaxNumImageFormats(va_dpy->va_dpy);
321 assert(num_formats > 0);
323 unique_ptr<VAImageFormat[]> formats(new VAImageFormat[num_formats]);
324 va_status = vaQueryImageFormats(va_dpy->va_dpy, formats.get(), &num_formats);
325 if (va_status != VA_STATUS_SUCCESS) {
327 snprintf(buf, sizeof(buf), "vaQueryImageFormats() failed with status %d\n", va_status);
328 if (error != nullptr) *error = buf;
332 bool uyvy_found = false, nv12_found = false;
333 for (int i = 0; i < num_formats; ++i) {
334 if (formats[i].fourcc == VA_FOURCC_UYVY) {
335 memcpy(&uyvy_format, &formats[i], sizeof(VAImageFormat));
338 if (formats[i].fourcc == VA_FOURCC_NV12) {
339 memcpy(&nv12_format, &formats[i], sizeof(VAImageFormat));
344 if (error != nullptr) *error = "UYVY format not found";
348 if (error != nullptr) *error = "NV12 format not found";
357 bool is_uyvy(RefCountedFrame frame)
359 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)frame->userdata;
360 return userdata->pixel_format == PixelFormat_8BitYCbCr && frame->interleaved;
363 bool is_i420(RefCountedFrame frame)
365 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)frame->userdata;
366 return userdata->pixel_format == PixelFormat_8BitYCbCrPlanar &&
367 userdata->ycbcr_format.chroma_subsampling_x == 2 &&
368 userdata->ycbcr_format.chroma_subsampling_y == 2;
373 void MJPEGEncoder::upload_frame(int64_t pts, unsigned card_index, RefCountedFrame frame, const bmusb::VideoFormat &video_format, size_t y_offset, size_t cbcr_offset, vector<int32_t> audio, const RGBTriplet &white_balance)
375 if (video_format.width == 0 || video_format.height == 0) {
376 ++metric_mjpeg_frames_zero_size_dropped;
379 if (video_format.interlaced) {
380 fprintf(stderr, "Card %u: Ignoring JPEG encoding for interlaced frame\n", card_index);
381 ++metric_mjpeg_frames_interlaced_dropped;
384 if (!is_uyvy(frame) && !is_i420(frame)) {
385 fprintf(stderr, "Card %u: Ignoring JPEG encoding for unsupported pixel format\n", card_index);
386 ++metric_mjpeg_frames_unsupported_pixel_format_dropped;
389 if (video_format.width > 4096 || video_format.height > 4096) {
390 fprintf(stderr, "Card %u: Ignoring JPEG encoding for oversized frame\n", card_index);
391 ++metric_mjpeg_frames_oversized_dropped;
395 lock_guard<mutex> lock(mu);
396 if (frames_to_be_encoded.size() + frames_encoding.size() > 50) {
397 fprintf(stderr, "WARNING: MJPEG encoding doesn't keep up, discarding frame.\n");
398 ++metric_mjpeg_overrun_dropped;
401 ++metric_mjpeg_overrun_submitted;
402 frames_to_be_encoded.push(QueuedFrame{ pts, card_index, frame, video_format, y_offset, cbcr_offset, move(audio), white_balance });
403 any_frames_to_be_encoded.notify_all();
406 bool MJPEGEncoder::should_encode_mjpeg_for_card(unsigned card_index)
408 // Only bother doing MJPEG encoding if there are any connected clients
409 // that want the stream.
410 if (httpd->get_num_connected_multicam_clients() == 0 &&
411 httpd->get_num_connected_siphon_clients(card_index) == 0) {
415 auto it = global_flags.card_to_mjpeg_stream_export.find(card_index);
416 return (it != global_flags.card_to_mjpeg_stream_export.end());
419 void MJPEGEncoder::encoder_thread_func()
421 pthread_setname_np(pthread_self(), "MJPEG_Encode");
422 posix_memalign((void **)&tmp_y, 4096, 4096 * 8);
423 posix_memalign((void **)&tmp_cbcr, 4096, 4096 * 8);
424 posix_memalign((void **)&tmp_cb, 4096, 4096 * 8);
425 posix_memalign((void **)&tmp_cr, 4096, 4096 * 8);
430 unique_lock<mutex> lock(mu);
431 any_frames_to_be_encoded.wait(lock, [this] { return !frames_to_be_encoded.empty() || should_quit; });
432 if (should_quit) break;
433 qf = move(frames_to_be_encoded.front());
434 frames_to_be_encoded.pop();
437 assert(global_flags.card_to_mjpeg_stream_export.count(qf.card_index)); // Or should_encode_mjpeg_for_card() would have returned false.
438 int stream_index = global_flags.card_to_mjpeg_stream_export[qf.card_index];
440 if (va_dpy != nullptr) {
441 // Will call back in the receiver thread.
442 encode_jpeg_va(move(qf));
444 update_siphon_streams();
446 HTTPD::StreamID multicam_id{ HTTPD::MULTICAM_STREAM, 0 };
447 HTTPD::StreamID siphon_id{ HTTPD::SIPHON_STREAM, qf.card_index };
448 assert(streams.count(multicam_id));
450 // Write audio before video, since Futatabi expects it.
451 if (qf.audio.size() > 0) {
452 write_audio_packet(streams[multicam_id].avctx.get(), qf.pts, stream_index + global_flags.card_to_mjpeg_stream_export.size(), qf.audio);
453 if (streams.count(siphon_id)) {
454 write_audio_packet(streams[siphon_id].avctx.get(), qf.pts, /*stream_index=*/1, qf.audio);
458 // Encode synchronously, in the same thread.
459 vector<uint8_t> jpeg = encode_jpeg_libjpeg(qf);
460 write_mjpeg_packet(streams[multicam_id].avctx.get(), qf.pts, stream_index, jpeg.data(), jpeg.size());
461 if (streams.count(siphon_id)) {
462 write_mjpeg_packet(streams[siphon_id].avctx.get(), qf.pts, /*stream_index=*/0, jpeg.data(), jpeg.size());
473 void MJPEGEncoder::write_mjpeg_packet(AVFormatContext *avctx, int64_t pts, unsigned stream_index, const uint8_t *jpeg, size_t jpeg_size)
476 memset(&pkt, 0, sizeof(pkt));
478 pkt.data = const_cast<uint8_t *>(jpeg);
479 pkt.size = jpeg_size;
480 pkt.stream_index = stream_index;
481 pkt.flags = AV_PKT_FLAG_KEY;
482 AVRational time_base = avctx->streams[pkt.stream_index]->time_base;
483 pkt.pts = pkt.dts = av_rescale_q(pts, AVRational{ 1, TIMEBASE }, time_base);
486 if (av_write_frame(avctx, &pkt) < 0) {
487 fprintf(stderr, "av_write_frame() failed\n");
492 void MJPEGEncoder::write_audio_packet(AVFormatContext *avctx, int64_t pts, unsigned stream_index, const vector<int32_t> &audio)
495 memset(&pkt, 0, sizeof(pkt));
497 pkt.data = reinterpret_cast<uint8_t *>(const_cast<int32_t *>(&audio[0]));
498 pkt.size = audio.size() * sizeof(audio[0]);
499 pkt.stream_index = stream_index;
500 pkt.flags = AV_PKT_FLAG_KEY;
501 AVRational time_base = avctx->streams[pkt.stream_index]->time_base;
502 pkt.pts = pkt.dts = av_rescale_q(pts, AVRational{ 1, TIMEBASE }, time_base);
503 size_t num_stereo_samples = audio.size() / 2;
504 pkt.duration = av_rescale_q(num_stereo_samples, AVRational{ 1, OUTPUT_FREQUENCY }, time_base);
506 if (av_write_frame(avctx, &pkt) < 0) {
507 fprintf(stderr, "av_write_frame() failed\n");
512 class VABufferDestroyer {
514 VABufferDestroyer(VADisplay dpy, VABufferID buf)
515 : dpy(dpy), buf(buf) {}
517 ~VABufferDestroyer() {
518 VAStatus va_status = vaDestroyBuffer(dpy, buf);
519 CHECK_VASTATUS(va_status, "vaDestroyBuffer");
527 MJPEGEncoder::VAResources MJPEGEncoder::get_va_resources(unsigned width, unsigned height, uint32_t fourcc)
530 lock_guard<mutex> lock(va_resources_mutex);
531 for (auto it = va_resources_freelist.begin(); it != va_resources_freelist.end(); ++it) {
532 if (it->width == width && it->height == height && it->fourcc == fourcc) {
533 VAResources ret = *it;
534 va_resources_freelist.erase(it);
546 VASurfaceAttrib attrib;
547 attrib.flags = VA_SURFACE_ATTRIB_SETTABLE;
548 attrib.type = VASurfaceAttribPixelFormat;
549 attrib.value.type = VAGenericValueTypeInteger;
550 attrib.value.value.i = fourcc;
553 VAConfigID config_id;
554 if (fourcc == VA_FOURCC_UYVY) {
555 va_status = vaCreateSurfaces(va_dpy->va_dpy, VA_RT_FORMAT_YUV422, width, height, &ret.surface, 1, &attrib, 1);
556 config_id = config_id_422;
558 assert(fourcc == VA_FOURCC_NV12);
559 va_status = vaCreateSurfaces(va_dpy->va_dpy, VA_RT_FORMAT_YUV420, width, height, &ret.surface, 1, &attrib, 1);
560 config_id = config_id_420;
563 va_status = vaCreateContext(va_dpy->va_dpy, config_id, width, height, 0, &ret.surface, 1, &ret.context);
564 CHECK_VASTATUS(va_status, "vaCreateContext");
566 va_status = vaCreateBuffer(va_dpy->va_dpy, ret.context, VAEncCodedBufferType, width * height * 3 + 8192, 1, nullptr, &ret.data_buffer);
567 CHECK_VASTATUS(va_status, "vaCreateBuffer");
569 if (fourcc == VA_FOURCC_UYVY) {
570 va_status = vaCreateImage(va_dpy->va_dpy, &uyvy_format, width, height, &ret.image);
571 CHECK_VASTATUS(va_status, "vaCreateImage");
573 assert(fourcc == VA_FOURCC_NV12);
574 va_status = vaCreateImage(va_dpy->va_dpy, &nv12_format, width, height, &ret.image);
575 CHECK_VASTATUS(va_status, "vaCreateImage");
581 void MJPEGEncoder::release_va_resources(MJPEGEncoder::VAResources resources)
583 lock_guard<mutex> lock(va_resources_mutex);
584 if (va_resources_freelist.size() > 50) {
585 auto it = va_resources_freelist.end();
588 VAStatus va_status = vaDestroyBuffer(va_dpy->va_dpy, it->data_buffer);
589 CHECK_VASTATUS(va_status, "vaDestroyBuffer");
591 va_status = vaDestroyContext(va_dpy->va_dpy, it->context);
592 CHECK_VASTATUS(va_status, "vaDestroyContext");
594 va_status = vaDestroySurfaces(va_dpy->va_dpy, &it->surface, 1);
595 CHECK_VASTATUS(va_status, "vaDestroySurfaces");
597 va_status = vaDestroyImage(va_dpy->va_dpy, it->image.image_id);
598 CHECK_VASTATUS(va_status, "vaDestroyImage");
600 va_resources_freelist.erase(it);
603 va_resources_freelist.push_front(resources);
608 void push16(uint16_t val, string *str)
610 str->push_back(val >> 8);
611 str->push_back(val & 0xff);
614 void push32(uint32_t val, string *str)
616 str->push_back(val >> 24);
617 str->push_back((val >> 16) & 0xff);
618 str->push_back((val >> 8) & 0xff);
619 str->push_back(val & 0xff);
624 void MJPEGEncoder::init_jpeg(unsigned width, unsigned height, const RGBTriplet &white_balance, VectorDestinationManager *dest, jpeg_compress_struct *cinfo, int y_h_samp_factor, int y_v_samp_factor)
627 cinfo->err = jpeg_std_error(&jerr);
628 jpeg_create_compress(cinfo);
630 cinfo->dest = (jpeg_destination_mgr *)dest;
632 cinfo->input_components = 3;
633 jpeg_set_defaults(cinfo);
634 jpeg_set_quality(cinfo, quality, /*force_baseline=*/false);
636 cinfo->image_width = width;
637 cinfo->image_height = height;
638 cinfo->raw_data_in = true;
639 jpeg_set_colorspace(cinfo, JCS_YCbCr);
640 cinfo->comp_info[0].h_samp_factor = y_h_samp_factor;
641 cinfo->comp_info[0].v_samp_factor = y_v_samp_factor;
642 cinfo->comp_info[1].h_samp_factor = 1;
643 cinfo->comp_info[1].v_samp_factor = 1;
644 cinfo->comp_info[2].h_samp_factor = 1;
645 cinfo->comp_info[2].v_samp_factor = 1;
646 cinfo->CCIR601_sampling = true; // Seems to be mostly ignored by libjpeg, though.
647 jpeg_start_compress(cinfo, true);
649 if (fabs(white_balance.r - 1.0f) > 1e-3 ||
650 fabs(white_balance.g - 1.0f) > 1e-3 ||
651 fabs(white_balance.b - 1.0f) > 1e-3) {
652 // Convert from (linear) RGB to XYZ.
653 Matrix3d rgb_to_xyz_matrix = movit::ColorspaceConversionEffect::get_xyz_matrix(COLORSPACE_sRGB);
654 Vector3d xyz = rgb_to_xyz_matrix * Vector3d(white_balance.r, white_balance.g, white_balance.b);
656 // Convert from XYZ to xyz by normalizing.
657 xyz /= (xyz[0] + xyz[1] + xyz[2]);
659 // Create a very rudimentary EXIF header to hold our white point.
662 // Exif header, followed by some padding.
666 // TIFF header first:
667 exif += "MM"; // Big endian.
672 // Offset of first IFD (relative to the MM, immediately after the header).
673 push32(exif.size() - 6 + 4, &exif);
675 // Now the actual IFD.
680 // WhitePoint tag ID.
681 push16(0x13e, &exif);
686 // Two values (x and y; z is implicit due to normalization).
689 // Offset (relative to the MM, immediately after the last IFD).
690 push32(exif.size() - 6 + 8, &exif);
695 // The actual values.
696 push32(lrintf(xyz[0] * 10000.0f), &exif);
697 push32(10000, &exif);
698 push32(lrintf(xyz[1] * 10000.0f), &exif);
699 push32(10000, &exif);
701 jpeg_write_marker(cinfo, JPEG_APP0 + 1, (const JOCTET *)exif.data(), exif.size());
704 // This comment marker is private to FFmpeg. It signals limited Y'CbCr range
705 // (and nothing else).
706 jpeg_write_marker(cinfo, JPEG_COM, (const JOCTET *)"CS=ITU601", strlen("CS=ITU601"));
709 vector<uint8_t> MJPEGEncoder::get_jpeg_header(unsigned width, unsigned height, const RGBTriplet &white_balance, int y_h_samp_factor, int y_v_samp_factor, jpeg_compress_struct *cinfo)
711 VectorDestinationManager dest;
712 init_jpeg(width, height, white_balance, &dest, cinfo, y_h_samp_factor, y_v_samp_factor);
714 // Make a dummy black image; there's seemingly no other easy way of
715 // making libjpeg outputting all of its headers.
716 assert(y_v_samp_factor <= 2); // Or we'd need larger JSAMPROW arrays below.
717 size_t block_height_y = 8 * y_v_samp_factor;
718 size_t block_height_cbcr = 8;
720 JSAMPROW yptr[16], cbptr[16], crptr[16];
721 JSAMPARRAY data[3] = { yptr, cbptr, crptr };
722 memset(tmp_y, 0, 4096);
723 memset(tmp_cb, 0, 4096);
724 memset(tmp_cr, 0, 4096);
725 for (unsigned yy = 0; yy < block_height_y; ++yy) {
728 for (unsigned yy = 0; yy < block_height_cbcr; ++yy) {
732 for (unsigned y = 0; y < height; y += block_height_y) {
733 jpeg_write_raw_data(cinfo, data, block_height_y);
735 jpeg_finish_compress(cinfo);
737 // We're only interested in the header, not the data after it.
738 dest.term_destination();
739 for (size_t i = 0; i < dest.dest.size() - 1; ++i) {
740 if (dest.dest[i] == 0xff && dest.dest[i + 1] == 0xda) { // Start of scan (SOS).
741 unsigned len = dest.dest[i + 2] * 256 + dest.dest[i + 3];
742 dest.dest.resize(i + len + 2);
750 MJPEGEncoder::VAData MJPEGEncoder::get_va_data_for_parameters(unsigned width, unsigned height, unsigned y_h_samp_factor, unsigned y_v_samp_factor, const RGBTriplet &white_balance)
752 VAKey key{width, height, y_h_samp_factor, y_v_samp_factor, white_balance};
753 if (va_data_for_parameters.count(key)) {
754 return va_data_for_parameters[key];
757 // Use libjpeg to generate a header and set sane defaults for e.g.
758 // quantization tables. Then do the actual encode with VA-API.
759 jpeg_compress_struct cinfo;
760 vector<uint8_t> jpeg_header = get_jpeg_header(width, height, white_balance, y_h_samp_factor, y_v_samp_factor, &cinfo);
762 // Picture parameters.
763 VAEncPictureParameterBufferJPEG pic_param;
764 memset(&pic_param, 0, sizeof(pic_param));
765 pic_param.reconstructed_picture = VA_INVALID_ID;
766 pic_param.picture_width = cinfo.image_width;
767 pic_param.picture_height = cinfo.image_height;
768 for (int component_idx = 0; component_idx < cinfo.num_components; ++component_idx) {
769 const jpeg_component_info *comp = &cinfo.comp_info[component_idx];
770 pic_param.component_id[component_idx] = comp->component_id;
771 pic_param.quantiser_table_selector[component_idx] = comp->quant_tbl_no;
773 pic_param.num_components = cinfo.num_components;
774 pic_param.num_scan = 1;
775 pic_param.sample_bit_depth = 8;
776 pic_param.coded_buf = VA_INVALID_ID; // To be filled out by caller.
777 pic_param.pic_flags.bits.huffman = 1;
778 pic_param.quality = 50; // Don't scale the given quantization matrices. (See gen8_mfc_jpeg_fqm_state)
780 // Quantization matrices.
781 VAQMatrixBufferJPEG q;
782 memset(&q, 0, sizeof(q));
784 q.load_lum_quantiser_matrix = true;
785 q.load_chroma_quantiser_matrix = true;
786 for (int quant_tbl_idx = 0; quant_tbl_idx < min(4, NUM_QUANT_TBLS); ++quant_tbl_idx) {
787 const JQUANT_TBL *qtbl = cinfo.quant_tbl_ptrs[quant_tbl_idx];
788 assert((qtbl == nullptr) == (quant_tbl_idx >= 2));
789 if (qtbl == nullptr) continue;
791 uint8_t *qmatrix = (quant_tbl_idx == 0) ? q.lum_quantiser_matrix : q.chroma_quantiser_matrix;
792 for (int i = 0; i < 64; ++i) {
793 if (qtbl->quantval[i] > 255) {
794 fprintf(stderr, "Baseline JPEG only!\n");
797 qmatrix[i] = qtbl->quantval[jpeg_natural_order[i]];
801 // Huffman tables (arithmetic is not supported).
802 VAHuffmanTableBufferJPEGBaseline huff;
803 memset(&huff, 0, sizeof(huff));
805 for (int huff_tbl_idx = 0; huff_tbl_idx < min(2, NUM_HUFF_TBLS); ++huff_tbl_idx) {
806 const JHUFF_TBL *ac_hufftbl = cinfo.ac_huff_tbl_ptrs[huff_tbl_idx];
807 const JHUFF_TBL *dc_hufftbl = cinfo.dc_huff_tbl_ptrs[huff_tbl_idx];
808 if (ac_hufftbl == nullptr) {
809 assert(dc_hufftbl == nullptr);
810 huff.load_huffman_table[huff_tbl_idx] = 0;
812 assert(dc_hufftbl != nullptr);
813 huff.load_huffman_table[huff_tbl_idx] = 1;
815 for (int i = 0; i < 16; ++i) {
816 huff.huffman_table[huff_tbl_idx].num_dc_codes[i] = dc_hufftbl->bits[i + 1];
818 for (int i = 0; i < 12; ++i) {
819 huff.huffman_table[huff_tbl_idx].dc_values[i] = dc_hufftbl->huffval[i];
821 for (int i = 0; i < 16; ++i) {
822 huff.huffman_table[huff_tbl_idx].num_ac_codes[i] = ac_hufftbl->bits[i + 1];
824 for (int i = 0; i < 162; ++i) {
825 huff.huffman_table[huff_tbl_idx].ac_values[i] = ac_hufftbl->huffval[i];
830 // Slice parameters (metadata about the slice).
831 VAEncSliceParameterBufferJPEG parms;
832 memset(&parms, 0, sizeof(parms));
833 for (int component_idx = 0; component_idx < cinfo.num_components; ++component_idx) {
834 const jpeg_component_info *comp = &cinfo.comp_info[component_idx];
835 parms.components[component_idx].component_selector = comp->component_id;
836 parms.components[component_idx].dc_table_selector = comp->dc_tbl_no;
837 parms.components[component_idx].ac_table_selector = comp->ac_tbl_no;
838 if (parms.components[component_idx].dc_table_selector > 1 ||
839 parms.components[component_idx].ac_table_selector > 1) {
840 fprintf(stderr, "Uses too many Huffman tables\n");
844 parms.num_components = cinfo.num_components;
845 parms.restart_interval = cinfo.restart_interval;
847 jpeg_destroy_compress(&cinfo);
850 ret.jpeg_header = move(jpeg_header);
851 ret.pic_param = pic_param;
855 va_data_for_parameters[key] = ret;
859 void MJPEGEncoder::encode_jpeg_va(QueuedFrame &&qf)
861 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)qf.frame->userdata;
862 unsigned width = qf.video_format.width;
863 unsigned height = qf.video_format.height;
865 VAResources resources;
866 ReleaseVAResources release;
867 if (userdata->data_copy_current_src == PBOFrameAllocator::Userdata::FROM_VA_API) {
868 assert(is_uyvy(qf.frame));
869 resources = move(userdata->va_resources);
870 release = move(userdata->va_resources_release);
872 assert(userdata->data_copy_current_src == PBOFrameAllocator::Userdata::FROM_MALLOC);
873 if (is_uyvy(qf.frame)) {
874 resources = get_va_resources(width, height, VA_FOURCC_UYVY);
876 assert(is_i420(qf.frame));
877 // We'd prefer VA_FOURCC_I420, but it's not supported by Intel's driver.
878 resources = get_va_resources(width, height, VA_FOURCC_NV12);
880 release = ReleaseVAResources(this, resources);
883 int y_h_samp_factor, y_v_samp_factor;
884 if (is_uyvy(qf.frame)) {
885 // 4:2:2 (sample Y' twice as often vertically as Cb or Cr).
889 // 4:2:0 (sample Y' twice as often as Cb or Cr, in both directions)
890 assert(is_i420(qf.frame));
895 VAData va_data = get_va_data_for_parameters(width, height, y_h_samp_factor, y_v_samp_factor, qf.white_balance);
896 va_data.pic_param.coded_buf = resources.data_buffer;
898 VABufferID pic_param_buffer;
899 VAStatus va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAEncPictureParameterBufferType, sizeof(va_data.pic_param), 1, &va_data.pic_param, &pic_param_buffer);
900 CHECK_VASTATUS(va_status, "vaCreateBuffer");
901 VABufferDestroyer destroy_pic_param(va_dpy->va_dpy, pic_param_buffer);
904 va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAQMatrixBufferType, sizeof(va_data.q), 1, &va_data.q, &q_buffer);
905 CHECK_VASTATUS(va_status, "vaCreateBuffer");
906 VABufferDestroyer destroy_iq(va_dpy->va_dpy, q_buffer);
908 VABufferID huff_buffer;
909 va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAHuffmanTableBufferType, sizeof(va_data.huff), 1, &va_data.huff, &huff_buffer);
910 CHECK_VASTATUS(va_status, "vaCreateBuffer");
911 VABufferDestroyer destroy_huff(va_dpy->va_dpy, huff_buffer);
913 VABufferID slice_param_buffer;
914 va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAEncSliceParameterBufferType, sizeof(va_data.parms), 1, &va_data.parms, &slice_param_buffer);
915 CHECK_VASTATUS(va_status, "vaCreateBuffer");
916 VABufferDestroyer destroy_slice_param(va_dpy->va_dpy, slice_param_buffer);
918 if (userdata->data_copy_current_src == PBOFrameAllocator::Userdata::FROM_VA_API) {
919 // The pixel data is already put into the image by the caller.
920 va_status = vaUnmapBuffer(va_dpy->va_dpy, resources.image.buf);
921 CHECK_VASTATUS(va_status, "vaUnmapBuffer");
923 assert(userdata->data_copy_current_src == PBOFrameAllocator::Userdata::FROM_MALLOC);
925 // Upload the pixel data.
926 uint8_t *surface_p = nullptr;
927 vaMapBuffer(va_dpy->va_dpy, resources.image.buf, (void **)&surface_p);
929 if (is_uyvy(qf.frame)) {
930 size_t field_start_line = qf.video_format.extra_lines_top; // No interlacing support.
931 size_t field_start = qf.cbcr_offset * 2 + qf.video_format.width * field_start_line * 2;
933 const uint8_t *src = qf.frame->data_copy + field_start;
934 uint8_t *dst = (unsigned char *)surface_p + resources.image.offsets[0];
935 memcpy_with_pitch(dst, src, qf.video_format.width * 2, resources.image.pitches[0], qf.video_format.height);
937 assert(is_i420(qf.frame));
938 assert(!qf.frame->interleaved); // Makes no sense for I420.
940 size_t field_start_line = qf.video_format.extra_lines_top; // No interlacing support.
941 const uint8_t *y_src = qf.frame->data + qf.video_format.width * field_start_line;
942 const uint8_t *cb_src = y_src + width * height;
943 const uint8_t *cr_src = cb_src + (width / 2) * (height / 2);
945 uint8_t *y_dst = (unsigned char *)surface_p + resources.image.offsets[0];
946 uint8_t *cbcr_dst = (unsigned char *)surface_p + resources.image.offsets[1];
948 memcpy_with_pitch(y_dst, y_src, qf.video_format.width, resources.image.pitches[0], qf.video_format.height);
949 interleave_with_pitch(cbcr_dst, cb_src, cr_src, qf.video_format.width / 2, resources.image.pitches[1], qf.video_format.height / 2);
952 va_status = vaUnmapBuffer(va_dpy->va_dpy, resources.image.buf);
953 CHECK_VASTATUS(va_status, "vaUnmapBuffer");
956 qf.frame->data_copy = nullptr;
958 // Seemingly vaPutImage() (which triggers a GPU copy) is much nicer to the
959 // CPU than vaDeriveImage() and copying directly into the GPU's buffers.
960 // Exactly why is unclear, but it seems to involve L3 cache usage when there
961 // are many high-res (1080p+) images in play.
962 va_status = vaPutImage(va_dpy->va_dpy, resources.surface, resources.image.image_id, 0, 0, width, height, 0, 0, width, height);
963 CHECK_VASTATUS(va_status, "vaPutImage");
965 // Finally, stick in the JPEG header.
966 VAEncPackedHeaderParameterBuffer header_parm;
967 header_parm.type = VAEncPackedHeaderRawData;
968 header_parm.bit_length = 8 * va_data.jpeg_header.size();
970 VABufferID header_parm_buffer;
971 va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAEncPackedHeaderParameterBufferType, sizeof(header_parm), 1, &header_parm, &header_parm_buffer);
972 CHECK_VASTATUS(va_status, "vaCreateBuffer");
973 VABufferDestroyer destroy_header(va_dpy->va_dpy, header_parm_buffer);
975 VABufferID header_data_buffer;
976 va_status = vaCreateBuffer(va_dpy->va_dpy, resources.context, VAEncPackedHeaderDataBufferType, va_data.jpeg_header.size(), 1, va_data.jpeg_header.data(), &header_data_buffer);
977 CHECK_VASTATUS(va_status, "vaCreateBuffer");
978 VABufferDestroyer destroy_header_data(va_dpy->va_dpy, header_data_buffer);
980 va_status = vaBeginPicture(va_dpy->va_dpy, resources.context, resources.surface);
981 CHECK_VASTATUS(va_status, "vaBeginPicture");
982 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &pic_param_buffer, 1);
983 CHECK_VASTATUS(va_status, "vaRenderPicture(pic_param)");
984 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &q_buffer, 1);
985 CHECK_VASTATUS(va_status, "vaRenderPicture(q)");
986 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &huff_buffer, 1);
987 CHECK_VASTATUS(va_status, "vaRenderPicture(huff)");
988 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &slice_param_buffer, 1);
989 CHECK_VASTATUS(va_status, "vaRenderPicture(slice_param)");
990 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &header_parm_buffer, 1);
991 CHECK_VASTATUS(va_status, "vaRenderPicture(header_parm)");
992 va_status = vaRenderPicture(va_dpy->va_dpy, resources.context, &header_data_buffer, 1);
993 CHECK_VASTATUS(va_status, "vaRenderPicture(header_data)");
994 va_status = vaEndPicture(va_dpy->va_dpy, resources.context);
995 CHECK_VASTATUS(va_status, "vaEndPicture");
997 qf.resources = move(resources);
998 qf.resource_releaser = move(release);
1000 lock_guard<mutex> lock(mu);
1001 frames_encoding.push(move(qf));
1002 any_frames_encoding.notify_all();
1005 void MJPEGEncoder::va_receiver_thread_func()
1007 pthread_setname_np(pthread_self(), "MJPEG_Receive");
1011 unique_lock<mutex> lock(mu);
1012 any_frames_encoding.wait(lock, [this] { return !frames_encoding.empty() || should_quit; });
1013 if (should_quit) return;
1014 qf = move(frames_encoding.front());
1015 frames_encoding.pop();
1018 update_siphon_streams();
1020 assert(global_flags.card_to_mjpeg_stream_export.count(qf.card_index)); // Or should_encode_mjpeg_for_card() would have returned false.
1021 int stream_index = global_flags.card_to_mjpeg_stream_export[qf.card_index];
1023 HTTPD::StreamID multicam_id{ HTTPD::MULTICAM_STREAM, 0 };
1024 HTTPD::StreamID siphon_id{ HTTPD::SIPHON_STREAM, qf.card_index };
1025 assert(streams.count(multicam_id));
1026 assert(streams[multicam_id].avctx != nullptr);
1028 // Write audio before video, since Futatabi expects it.
1029 if (qf.audio.size() > 0) {
1030 write_audio_packet(streams[multicam_id].avctx.get(), qf.pts, stream_index + global_flags.card_to_mjpeg_stream_export.size(), qf.audio);
1031 if (streams.count(siphon_id)) {
1032 write_audio_packet(streams[siphon_id].avctx.get(), qf.pts, /*stream_index=*/1, qf.audio);
1036 VAStatus va_status = vaSyncSurface(va_dpy->va_dpy, qf.resources.surface);
1037 CHECK_VASTATUS(va_status, "vaSyncSurface");
1039 VACodedBufferSegment *segment;
1040 va_status = vaMapBuffer(va_dpy->va_dpy, qf.resources.data_buffer, (void **)&segment);
1041 CHECK_VASTATUS(va_status, "vaMapBuffer");
1043 const uint8_t *coded_buf = reinterpret_cast<uint8_t *>(segment->buf);
1044 write_mjpeg_packet(streams[multicam_id].avctx.get(), qf.pts, stream_index, coded_buf, segment->size);
1045 if (streams.count(siphon_id)) {
1046 write_mjpeg_packet(streams[siphon_id].avctx.get(), qf.pts, /*stream_index=*/0, coded_buf, segment->size);
1049 va_status = vaUnmapBuffer(va_dpy->va_dpy, qf.resources.data_buffer);
1050 CHECK_VASTATUS(va_status, "vaUnmapBuffer");
1054 vector<uint8_t> MJPEGEncoder::encode_jpeg_libjpeg(const QueuedFrame &qf)
1056 unsigned width = qf.video_format.width;
1057 unsigned height = qf.video_format.height;
1059 VectorDestinationManager dest;
1060 jpeg_compress_struct cinfo;
1062 size_t field_start_line = qf.video_format.extra_lines_top; // No interlacing support.
1064 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)qf.frame->userdata;
1065 if (userdata->pixel_format == PixelFormat_8BitYCbCr) {
1066 init_jpeg(width, height, qf.white_balance, &dest, &cinfo, /*y_h_samp_factor=*/2, /*y_v_samp_factor=*/1);
1068 assert(qf.frame->interleaved);
1069 size_t field_start = qf.cbcr_offset * 2 + qf.video_format.width * field_start_line * 2;
1071 JSAMPROW yptr[8], cbptr[8], crptr[8];
1072 JSAMPARRAY data[3] = { yptr, cbptr, crptr };
1073 for (unsigned y = 0; y < qf.video_format.height; y += 8) {
1075 src = qf.frame->data_copy + field_start + y * qf.video_format.width * 2;
1077 memcpy_interleaved(tmp_cbcr, tmp_y, src, qf.video_format.width * 8 * 2);
1078 memcpy_interleaved(tmp_cb, tmp_cr, tmp_cbcr, qf.video_format.width * 8);
1079 for (unsigned yy = 0; yy < 8; ++yy) {
1080 yptr[yy] = tmp_y + yy * width;
1081 cbptr[yy] = tmp_cb + yy * width / 2;
1082 crptr[yy] = tmp_cr + yy * width / 2;
1084 jpeg_write_raw_data(&cinfo, data, /*num_lines=*/8);
1087 assert(userdata->pixel_format == PixelFormat_8BitYCbCrPlanar);
1089 const movit::YCbCrFormat &ycbcr = userdata->ycbcr_format;
1090 init_jpeg(width, height, qf.white_balance, &dest, &cinfo, ycbcr.chroma_subsampling_x, ycbcr.chroma_subsampling_y);
1091 assert(ycbcr.chroma_subsampling_y <= 2); // Or we'd need larger JSAMPROW arrays below.
1093 size_t field_start_line = qf.video_format.extra_lines_top; // No interlacing support.
1094 const uint8_t *y_start = qf.frame->data + qf.video_format.width * field_start_line;
1095 const uint8_t *cb_start = y_start + width * height;
1096 const uint8_t *cr_start = cb_start + (width / ycbcr.chroma_subsampling_x) * (height / ycbcr.chroma_subsampling_y);
1098 size_t block_height_y = 8 * ycbcr.chroma_subsampling_y;
1099 size_t block_height_cbcr = 8;
1101 JSAMPROW yptr[16], cbptr[16], crptr[16];
1102 JSAMPARRAY data[3] = { yptr, cbptr, crptr };
1103 for (unsigned y = 0; y < qf.video_format.height; y += block_height_y) {
1104 for (unsigned yy = 0; yy < block_height_y; ++yy) {
1105 yptr[yy] = const_cast<JSAMPROW>(y_start) + (y + yy) * width;
1107 unsigned cbcr_y = y / ycbcr.chroma_subsampling_y;
1108 for (unsigned yy = 0; yy < block_height_cbcr; ++yy) {
1109 cbptr[yy] = const_cast<JSAMPROW>(cb_start) + (cbcr_y + yy) * width / ycbcr.chroma_subsampling_x;
1110 crptr[yy] = const_cast<JSAMPROW>(cr_start) + (cbcr_y + yy) * width / ycbcr.chroma_subsampling_x;
1112 jpeg_write_raw_data(&cinfo, data, block_height_y);
1115 jpeg_finish_compress(&cinfo);
1120 void MJPEGEncoder::add_stream(HTTPD::StreamID stream_id)
1122 AVFormatContextWithCloser avctx;
1124 // Set up the mux. We don't use the Mux wrapper, because it's geared towards
1125 // a situation with only one video stream (and possibly one audio stream)
1126 // with known width/height, and we don't need the extra functionality it provides.
1127 avctx.reset(avformat_alloc_context());
1128 avctx->oformat = av_guess_format("nut", nullptr, nullptr);
1130 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
1131 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, &ffmpeg_contexts[stream_id], nullptr, nullptr, nullptr);
1132 avctx->pb->write_data_type = &MJPEGEncoder::write_packet2_thunk;
1133 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
1135 if (stream_id.type == HTTPD::MULTICAM_STREAM) {
1136 for (unsigned card_idx = 0; card_idx < global_flags.card_to_mjpeg_stream_export.size(); ++card_idx) {
1137 add_video_stream(avctx.get());
1139 for (unsigned card_idx = 0; card_idx < global_flags.card_to_mjpeg_stream_export.size(); ++card_idx) {
1140 add_audio_stream(avctx.get());
1143 assert(stream_id.type == HTTPD::SIPHON_STREAM);
1144 add_video_stream(avctx.get());
1145 add_audio_stream(avctx.get());
1147 finalize_mux(avctx.get());
1150 s.avctx = move(avctx);
1151 streams[stream_id] = move(s);
1154 void MJPEGEncoder::update_siphon_streams()
1156 // Bring the list of streams into sync with what the clients need.
1157 for (auto it = streams.begin(); it != streams.end(); ) {
1158 if (it->first.type != HTTPD::SIPHON_STREAM) {
1162 if (httpd->get_num_connected_siphon_clients(it->first.index) == 0) {
1163 av_free(it->second.avctx->pb->buffer);
1164 streams.erase(it++);
1169 for (unsigned stream_idx = 0; stream_idx < MAX_VIDEO_CARDS; ++stream_idx) {
1170 HTTPD::StreamID stream_id{ HTTPD::SIPHON_STREAM, stream_idx };
1171 if (streams.count(stream_id) == 0 && httpd->get_num_connected_siphon_clients(stream_idx) > 0) {
1172 add_stream(stream_id);
1177 void MJPEGEncoder::create_ffmpeg_context(HTTPD::StreamID stream_id)
1179 ffmpeg_contexts.emplace(stream_id, WritePacket2Context{ this, stream_id });