OLD | NEW |
---|---|
1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "media/cast/sender/h264_vt_encoder.h" | 5 #include "content/common/gpu/media/vt_video_encode_accelerator_mac.h" |
6 | 6 |
7 #include <stddef.h> | 7 #include "base/thread_task_runner_handle.h" |
8 | 8 #include "media/base/mac/coremedia_glue.h" |
9 #include <string> | |
10 #include <vector> | |
11 | |
12 #include "base/big_endian.h" | |
13 #include "base/bind.h" | |
14 #include "base/bind_helpers.h" | |
15 #include "base/location.h" | |
16 #include "base/logging.h" | |
17 #include "base/macros.h" | |
18 #include "base/power_monitor/power_monitor.h" | |
19 #include "base/synchronization/lock.h" | |
20 #include "build/build_config.h" | |
21 #include "media/base/mac/corevideo_glue.h" | 9 #include "media/base/mac/corevideo_glue.h" |
22 #include "media/base/mac/video_frame_mac.h" | 10 #include "media/base/mac/video_frame_mac.h" |
23 #include "media/cast/common/rtp_time.h" | 11 |
24 #include "media/cast/constants.h" | 12 namespace content { |
25 #include "media/cast/sender/video_frame_factory.h" | |
26 | |
27 namespace media { | |
28 namespace cast { | |
29 | 13 |
30 namespace { | 14 namespace { |
31 | 15 |
32 // Container for the associated data of a video frame being processed. | 16 // Subjectively chosen. |
33 struct InProgressFrameEncode { | 17 // TODO(emircan): Check if we can find the actual system capabilities via |
34 const RtpTimeTicks rtp_timestamp; | 18 // creating VTCompressionSessions with varying requirements. |
19 // See crbug.com/584784. | |
20 const size_t kNumInputBuffers = 3; | |
21 const size_t kMaxFrameRateNumerator = 30; | |
22 const size_t kMaxFrameRateDenominator = 1; | |
23 const size_t kMaxResolutionWidth = 4096; | |
24 const size_t kMaxResolutionHeight = 2160; | |
25 const size_t kBitsPerByte = 8; | |
26 | |
27 } // namespace | |
28 | |
29 struct VTVideoEncodeAccelerator::InProgressFrameEncode { | |
30 InProgressFrameEncode(base::TimeDelta rtp_timestamp, base::TimeTicks ref_time) | |
31 : timestamp(rtp_timestamp), reference_time(ref_time) {} | |
32 const base::TimeDelta timestamp; | |
35 const base::TimeTicks reference_time; | 33 const base::TimeTicks reference_time; |
36 const VideoEncoder::FrameEncodedCallback frame_encoded_callback; | 34 |
37 | 35 private: |
38 InProgressFrameEncode(RtpTimeTicks rtp, | 36 DISALLOW_IMPLICIT_CONSTRUCTORS(InProgressFrameEncode); |
39 base::TimeTicks r_time, | |
40 VideoEncoder::FrameEncodedCallback callback) | |
41 : rtp_timestamp(rtp), | |
42 reference_time(r_time), | |
43 frame_encoded_callback(callback) {} | |
44 }; | 37 }; |
45 | 38 |
46 base::ScopedCFTypeRef<CFDictionaryRef> | 39 struct VTVideoEncodeAccelerator::EncodeOutput { |
47 DictionaryWithKeysAndValues(CFTypeRef* keys, CFTypeRef* values, size_t size) { | 40 EncodeOutput(VTEncodeInfoFlags info_flags, CMSampleBufferRef sbuf) |
48 return base::ScopedCFTypeRef<CFDictionaryRef>(CFDictionaryCreate( | 41 : info(info_flags), sample_buffer(sbuf) {} |
49 kCFAllocatorDefault, keys, values, size, &kCFTypeDictionaryKeyCallBacks, | 42 const VTEncodeInfoFlags info; |
50 &kCFTypeDictionaryValueCallBacks)); | 43 const CMSampleBufferRef sample_buffer; |
jfroy
2016/03/07 21:57:07
Would it be safer to use a smart pointer to manage
emircan
2016/03/08 03:02:30
Done.
| |
51 } | 44 |
52 | 45 private: |
53 base::ScopedCFTypeRef<CFDictionaryRef> DictionaryWithKeyValue(CFTypeRef key, | 46 DISALLOW_IMPLICIT_CONSTRUCTORS(EncodeOutput); |
54 CFTypeRef value) { | 47 }; |
55 CFTypeRef keys[1] = {key}; | 48 |
56 CFTypeRef values[1] = {value}; | 49 struct VTVideoEncodeAccelerator::BitstreamBufferRef { |
57 return DictionaryWithKeysAndValues(keys, values, 1); | 50 BitstreamBufferRef(int32_t id, |
58 } | 51 scoped_ptr<base::SharedMemory> shm, |
59 | 52 size_t size) |
60 base::ScopedCFTypeRef<CFArrayRef> ArrayWithIntegers(const int* v, size_t size) { | 53 : id(id), shm(std::move(shm)), size(size) {} |
61 std::vector<CFNumberRef> numbers; | 54 const int32_t id; |
62 numbers.reserve(size); | 55 const scoped_ptr<base::SharedMemory> shm; |
63 for (const int* end = v + size; v < end; ++v) | 56 const size_t size; |
64 numbers.push_back(CFNumberCreate(nullptr, kCFNumberSInt32Type, v)); | 57 |
65 base::ScopedCFTypeRef<CFArrayRef> array(CFArrayCreate( | 58 private: |
66 kCFAllocatorDefault, reinterpret_cast<const void**>(&numbers[0]), | 59 DISALLOW_IMPLICIT_CONSTRUCTORS(BitstreamBufferRef); |
67 numbers.size(), &kCFTypeArrayCallBacks)); | 60 }; |
68 for (auto& number : numbers) { | 61 |
69 CFRelease(number); | 62 VTVideoEncodeAccelerator::VTVideoEncodeAccelerator() |
70 } | 63 : client_task_runner_(base::ThreadTaskRunnerHandle::Get()), |
71 return array; | 64 encoder_thread_("VTEncoderThread"), |
72 } | 65 weak_this_factory_(this) { |
73 | 66 } |
74 template <typename NalSizeType> | 67 |
75 void CopyNalsToAnnexB(char* avcc_buffer, | 68 VTVideoEncodeAccelerator::~VTVideoEncodeAccelerator() { |
76 const size_t avcc_size, | 69 DVLOG(3) << __FUNCTION__; |
77 std::string* annexb_buffer) { | 70 DCHECK(thread_checker_.CalledOnValidThread()); |
78 static_assert(sizeof(NalSizeType) == 1 || sizeof(NalSizeType) == 2 || | 71 |
79 sizeof(NalSizeType) == 4, | 72 Destroy(); |
80 "NAL size type has unsupported size"); | 73 } |
81 static const char startcode_3[3] = {0, 0, 1}; | 74 |
82 DCHECK(avcc_buffer); | 75 media::VideoEncodeAccelerator::SupportedProfiles |
83 DCHECK(annexb_buffer); | 76 VTVideoEncodeAccelerator::GetSupportedProfiles() { |
84 size_t bytes_left = avcc_size; | 77 DVLOG(3) << __FUNCTION__; |
85 while (bytes_left > 0) { | 78 DCHECK(thread_checker_.CalledOnValidThread()); |
86 DCHECK_GT(bytes_left, sizeof(NalSizeType)); | 79 |
87 NalSizeType nal_size; | 80 SupportedProfiles profiles; |
88 base::ReadBigEndian(avcc_buffer, &nal_size); | 81 SupportedProfile profile; |
89 bytes_left -= sizeof(NalSizeType); | 82 profile.profile = media::H264PROFILE_BASELINE; |
90 avcc_buffer += sizeof(NalSizeType); | 83 profile.max_framerate_numerator = kMaxFrameRateNumerator; |
91 | 84 profile.max_framerate_denominator = kMaxFrameRateDenominator; |
92 DCHECK_GE(bytes_left, nal_size); | 85 profile.max_resolution = gfx::Size(kMaxResolutionWidth, kMaxResolutionHeight); |
93 annexb_buffer->append(startcode_3, sizeof(startcode_3)); | 86 profiles.push_back(profile); |
94 annexb_buffer->append(avcc_buffer, nal_size); | 87 return profiles; |
95 bytes_left -= nal_size; | 88 } |
96 avcc_buffer += nal_size; | 89 |
97 } | 90 bool VTVideoEncodeAccelerator::Initialize( |
98 } | 91 media::VideoPixelFormat format, |
99 | 92 const gfx::Size& input_visible_size, |
100 // Copy a H.264 frame stored in a CM sample buffer to an Annex B buffer. Copies | 93 media::VideoCodecProfile output_profile, |
101 // parameter sets for keyframes before the frame data as well. | 94 uint32_t initial_bitrate, |
102 void CopySampleBufferToAnnexBBuffer(CoreMediaGlue::CMSampleBufferRef sbuf, | 95 Client* client) { |
103 std::string* annexb_buffer, | 96 DVLOG(3) << __FUNCTION__ |
104 bool keyframe) { | 97 << ": input_format=" << media::VideoPixelFormatToString(format) |
105 // Perform two pass, one to figure out the total output size, and another to | 98 << ", input_visible_size=" << input_visible_size.ToString() |
106 // copy the data after having performed a single output allocation. Note that | 99 << ", output_profile=" << output_profile |
107 // we'll allocate a bit more because we'll count 4 bytes instead of 3 for | 100 << ", initial_bitrate=" << initial_bitrate; |
108 // video NALs. | 101 DCHECK(thread_checker_.CalledOnValidThread()); |
109 | 102 DCHECK(client); |
110 OSStatus status; | 103 |
111 | 104 if (media::PIXEL_FORMAT_I420 != format) { |
112 // Get the sample buffer's block buffer and format description. | 105 DLOG(ERROR) << "Input format not supported= " |
113 auto bb = CoreMediaGlue::CMSampleBufferGetDataBuffer(sbuf); | 106 << media::VideoPixelFormatToString(format); |
114 DCHECK(bb); | 107 return false; |
115 auto fdesc = CoreMediaGlue::CMSampleBufferGetFormatDescription(sbuf); | 108 } |
116 DCHECK(fdesc); | 109 if (media::H264PROFILE_BASELINE != output_profile) { |
117 | 110 DLOG(ERROR) << "Output profile not supported= " |
118 size_t bb_size = CoreMediaGlue::CMBlockBufferGetDataLength(bb); | 111 << output_profile; |
119 size_t total_bytes = bb_size; | 112 return false; |
120 | 113 } |
121 size_t pset_count; | 114 |
122 int nal_size_field_bytes; | 115 videotoolbox_glue_ = VideoToolboxGlue::Get(); |
123 status = CoreMediaGlue::CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | 116 if (!videotoolbox_glue_) { |
124 fdesc, 0, nullptr, nullptr, &pset_count, &nal_size_field_bytes); | 117 DLOG(ERROR) << "Failed creating VideoToolbox glue"; |
125 if (status == | 118 return false; |
126 CoreMediaGlue::kCMFormatDescriptionBridgeError_InvalidParameter) { | 119 } |
127 DLOG(WARNING) << " assuming 2 parameter sets and 4 bytes NAL length header"; | 120 |
128 pset_count = 2; | 121 client_ptr_factory_.reset(new base::WeakPtrFactory<Client>(client)); |
129 nal_size_field_bytes = 4; | 122 client_ = client_ptr_factory_->GetWeakPtr(); |
130 } else if (status != noErr) { | 123 input_visible_size_ = input_visible_size; |
131 DLOG(ERROR) | 124 frame_rate_ = kMaxFrameRateNumerator / kMaxFrameRateDenominator; |
132 << " CMVideoFormatDescriptionGetH264ParameterSetAtIndex failed: " | 125 target_bitrate_ = initial_bitrate; |
133 << status; | 126 bitstream_buffer_size_ = input_visible_size.GetArea(); |
134 return; | 127 |
135 } | 128 if (!ResetCompressionSession()) { |
136 | 129 DLOG(ERROR) << "Failed creating compression session"; |
137 if (keyframe) { | 130 return false; |
138 const uint8_t* pset; | 131 } |
139 size_t pset_size; | 132 |
140 for (size_t pset_i = 0; pset_i < pset_count; ++pset_i) { | 133 if (!encoder_thread_.Start()) { |
141 status = | 134 DLOG(ERROR) << "Failed spawning encoder thread"; |
142 CoreMediaGlue::CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | 135 return false; |
143 fdesc, pset_i, &pset, &pset_size, nullptr, nullptr); | 136 } |
144 if (status != noErr) { | 137 |
145 DLOG(ERROR) | 138 client_task_runner_->PostTask( |
146 << " CMVideoFormatDescriptionGetH264ParameterSetAtIndex failed: " | 139 FROM_HERE, |
147 << status; | 140 base::Bind(&Client::RequireBitstreamBuffers, client_, kNumInputBuffers, |
148 return; | 141 input_visible_size_, bitstream_buffer_size_)); |
149 } | 142 return true; |
150 total_bytes += pset_size + nal_size_field_bytes; | 143 } |
151 } | 144 |
152 } | 145 void VTVideoEncodeAccelerator::Encode( |
153 | 146 const scoped_refptr<media::VideoFrame>& frame, |
154 annexb_buffer->reserve(total_bytes); | 147 bool force_keyframe) { |
155 | 148 DVLOG(3) << __FUNCTION__; |
156 // Copy all parameter sets before keyframes. | 149 DCHECK(thread_checker_.CalledOnValidThread()); |
157 if (keyframe) { | 150 |
158 const uint8_t* pset; | 151 encoder_thread_.message_loop()->PostTask( |
159 size_t pset_size; | 152 FROM_HERE, |
160 for (size_t pset_i = 0; pset_i < pset_count; ++pset_i) { | 153 base::Bind(&VTVideoEncodeAccelerator::EncodeTask, |
161 status = | 154 base::Unretained(this), |
162 CoreMediaGlue::CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | 155 frame, |
163 fdesc, pset_i, &pset, &pset_size, nullptr, nullptr); | 156 force_keyframe)); |
164 if (status != noErr) { | 157 } |
165 DLOG(ERROR) | 158 |
166 << " CMVideoFormatDescriptionGetH264ParameterSetAtIndex failed: " | 159 void VTVideoEncodeAccelerator::UseOutputBitstreamBuffer( |
167 << status; | 160 const media::BitstreamBuffer& buffer) { |
168 return; | 161 DVLOG(3) << __FUNCTION__ << ": buffer size=" << buffer.size(); |
169 } | 162 DCHECK(thread_checker_.CalledOnValidThread()); |
170 static const char startcode_4[4] = {0, 0, 0, 1}; | 163 |
171 annexb_buffer->append(startcode_4, sizeof(startcode_4)); | 164 if (buffer.size() < bitstream_buffer_size_) { |
172 annexb_buffer->append(reinterpret_cast<const char*>(pset), pset_size); | 165 DLOG(ERROR) << "Output BitstreamBuffer isn't big enough: " << buffer.size() |
173 } | 166 << " vs. " << bitstream_buffer_size_; |
174 } | 167 client_->NotifyError(kInvalidArgumentError); |
175 | 168 return; |
176 // Block buffers can be composed of non-contiguous chunks. For the sake of | 169 } |
177 // keeping this code simple, flatten non-contiguous block buffers. | 170 |
178 base::ScopedCFTypeRef<CoreMediaGlue::CMBlockBufferRef> contiguous_bb( | 171 scoped_ptr<base::SharedMemory> shm( |
179 bb, base::scoped_policy::RETAIN); | 172 new base::SharedMemory(buffer.handle(), false)); |
180 if (!CoreMediaGlue::CMBlockBufferIsRangeContiguous(bb, 0, 0)) { | 173 if (!shm->Map(buffer.size())) { |
181 contiguous_bb.reset(); | 174 DLOG(ERROR) << "Failed mapping shared memory."; |
182 status = CoreMediaGlue::CMBlockBufferCreateContiguous( | 175 client_->NotifyError(kPlatformFailureError); |
183 kCFAllocatorDefault, bb, kCFAllocatorDefault, nullptr, 0, 0, 0, | 176 return; |
184 contiguous_bb.InitializeInto()); | 177 } |
185 if (status != noErr) { | 178 |
186 DLOG(ERROR) << " CMBlockBufferCreateContiguous failed: " << status; | 179 scoped_ptr<BitstreamBufferRef> buffer_ref( |
187 return; | 180 new BitstreamBufferRef(buffer.id(), std::move(shm), buffer.size())); |
188 } | 181 |
189 } | 182 encoder_thread_.message_loop()->PostTask( |
190 | 183 FROM_HERE, |
191 // Copy all the NAL units. In the process convert them from AVCC format | 184 base::Bind(&VTVideoEncodeAccelerator::UseOutputBitstreamBufferTask, |
192 // (length header) to AnnexB format (start code). | 185 base::Unretained(this), |
193 char* bb_data; | 186 base::Passed(&buffer_ref))); |
194 status = CoreMediaGlue::CMBlockBufferGetDataPointer(contiguous_bb, 0, nullptr, | 187 } |
195 nullptr, &bb_data); | 188 |
189 void VTVideoEncodeAccelerator::RequestEncodingParametersChange( | |
190 uint32_t bitrate, | |
191 uint32_t framerate) { | |
192 DVLOG(3) << __FUNCTION__ << ": bitrate=" << bitrate | |
193 << ": framerate=" << framerate; | |
194 DCHECK(thread_checker_.CalledOnValidThread()); | |
195 | |
196 frame_rate_ = framerate > 1 ? framerate : 1; | |
197 target_bitrate_ = bitrate > 1 ? bitrate : 1; | |
198 | |
199 if (!compression_session_) { | |
200 client_->NotifyError(kPlatformFailureError); | |
201 return; | |
202 } | |
203 | |
204 media::video_toolbox::SessionPropertySetter session_property_setter( | |
205 compression_session_, videotoolbox_glue_); | |
206 // TODO(emircan): See crbug.com/425352. | |
207 bool rv = session_property_setter.SetSessionProperty( | |
208 videotoolbox_glue_->kVTCompressionPropertyKey_AverageBitRate(), | |
209 target_bitrate_); | |
210 rv &= session_property_setter.SetSessionProperty( | |
211 videotoolbox_glue_->kVTCompressionPropertyKey_ExpectedFrameRate(), | |
212 frame_rate_); | |
213 rv &= session_property_setter.SetSessionProperty( | |
214 videotoolbox_glue_->kVTCompressionPropertyKey_DataRateLimits(), | |
215 media::video_toolbox::ArrayWithIntegerAndFloat( | |
216 target_bitrate_ / kBitsPerByte, 1.0f)); | |
217 DLOG_IF(ERROR, !rv) << "Couldn't change session encoding parameters."; | |
218 } | |
219 | |
220 void VTVideoEncodeAccelerator::Destroy() { | |
221 DVLOG(3) << __FUNCTION__; | |
222 DCHECK(thread_checker_.CalledOnValidThread()); | |
223 | |
224 // Cancel all callbacks. | |
225 client_ptr_factory_.reset(); | |
226 | |
227 if (encoder_thread_.IsRunning()) { | |
228 encoder_thread_.message_loop()->PostTask( | |
229 FROM_HERE, | |
230 base::Bind(&VTVideoEncodeAccelerator::DestroyTask, | |
231 base::Unretained(this))); | |
232 encoder_thread_.Stop(); | |
233 } else { | |
234 DestroyTask(); | |
235 } | |
236 } | |
237 | |
238 void VTVideoEncodeAccelerator::EncodeTask( | |
239 const scoped_refptr<media::VideoFrame>& frame, | |
240 bool force_keyframe) { | |
241 DCHECK(encoder_thread_.task_runner()->BelongsToCurrentThread()); | |
242 DCHECK(compression_session_); | |
243 DCHECK(frame); | |
244 | |
245 // TODO(emircan): See if we can eliminate a copy here by using | |
246 // CVPixelBufferPool for the allocation of incoming VideoFrames. | |
247 base::ScopedCFTypeRef<CVPixelBufferRef> pixel_buffer = | |
248 media::WrapVideoFrameInCVPixelBuffer(*frame); | |
249 base::ScopedCFTypeRef<CFDictionaryRef> frame_props = | |
250 media::video_toolbox::DictionaryWithKeyValue( | |
251 videotoolbox_glue_->kVTEncodeFrameOptionKey_ForceKeyFrame(), | |
252 force_keyframe ? kCFBooleanTrue : kCFBooleanFalse); | |
253 | |
254 base::TimeTicks ref_time; | |
255 if (!frame->metadata()->GetTimeTicks( | |
256 media::VideoFrameMetadata::REFERENCE_TIME, &ref_time)) { | |
257 ref_time = base::TimeTicks::Now(); | |
258 } | |
259 auto timestamp_cm = CoreMediaGlue::CMTimeMake( | |
260 frame->timestamp().InMicroseconds(), USEC_PER_SEC); | |
261 // Wrap information we'll need after the frame is encoded in a heap object. | |
262 // We'll get the pointer back from the VideoToolbox completion callback. | |
263 scoped_ptr<InProgressFrameEncode> request(new InProgressFrameEncode( | |
264 frame->timestamp(), ref_time)); | |
265 | |
266 OSStatus status = videotoolbox_glue_->VTCompressionSessionEncodeFrame( | |
267 compression_session_, pixel_buffer, timestamp_cm, | |
268 CoreMediaGlue::CMTime{0, 0, 0, 0}, frame_props, | |
269 reinterpret_cast<void*>(request.release()), nullptr); | |
196 if (status != noErr) { | 270 if (status != noErr) { |
197 DLOG(ERROR) << " CMBlockBufferGetDataPointer failed: " << status; | 271 DLOG(ERROR) << " VTCompressionSessionEncodeFrame failed: " << status; |
198 return; | 272 NotifyError(kPlatformFailureError); |
199 } | 273 } |
200 | 274 } |
201 if (nal_size_field_bytes == 1) { | 275 |
202 CopyNalsToAnnexB<uint8_t>(bb_data, bb_size, annexb_buffer); | 276 void VTVideoEncodeAccelerator::UseOutputBitstreamBufferTask( |
203 } else if (nal_size_field_bytes == 2) { | 277 scoped_ptr<BitstreamBufferRef> buffer_ref) { |
204 CopyNalsToAnnexB<uint16_t>(bb_data, bb_size, annexb_buffer); | 278 DCHECK(encoder_thread_.task_runner()->BelongsToCurrentThread()); |
205 } else if (nal_size_field_bytes == 4) { | 279 |
206 CopyNalsToAnnexB<uint32_t>(bb_data, bb_size, annexb_buffer); | 280 // If there is already EncodeOutput waiting, copy its output first. |
207 } else { | 281 if (!encoder_output_queue_.empty()) { |
208 NOTREACHED(); | 282 scoped_ptr<VTVideoEncodeAccelerator::EncodeOutput> encode_output = |
209 } | 283 std::move(encoder_output_queue_.front()); |
210 } | 284 encoder_output_queue_.pop_front(); |
211 | 285 ReturnBitstreamBuffer(encode_output->info, encode_output->sample_buffer, |
212 } // namespace | 286 std::move(buffer_ref)); |
213 | 287 return; |
214 class H264VideoToolboxEncoder::VideoFrameFactoryImpl | 288 } |
215 : public base::RefCountedThreadSafe<VideoFrameFactoryImpl>, | 289 |
216 public VideoFrameFactory { | 290 bitstream_buffer_queue_.push_back(std::move(buffer_ref)); |
217 public: | 291 } |
218 // Type that proxies the VideoFrameFactory interface to this class. | 292 |
219 class Proxy; | 293 void VTVideoEncodeAccelerator::DestroyTask() { |
220 | 294 // This thread runs on |encoder_thread_| if it is alive, otherwise on GPU |
221 VideoFrameFactoryImpl(const base::WeakPtr<H264VideoToolboxEncoder>& encoder, | 295 // child thread. |
222 const scoped_refptr<CastEnvironment>& cast_environment) | 296 |
223 : encoder_(encoder), cast_environment_(cast_environment) {} | 297 // Cancel all callbacks. |
224 | 298 weak_this_factory_.InvalidateWeakPtrs(); |
225 scoped_refptr<VideoFrame> MaybeCreateFrame( | 299 |
226 const gfx::Size& frame_size, | 300 // This call blocks until all pending frames are flushed out. |
227 base::TimeDelta timestamp) final { | 301 DestroyCompressionSession(); |
228 if (frame_size.IsEmpty()) { | 302 } |
229 DVLOG(1) << "Rejecting empty video frame."; | 303 |
230 return nullptr; | 304 void VTVideoEncodeAccelerator::NotifyError( |
231 } | 305 media::VideoEncodeAccelerator::Error error) { |
232 | 306 DCHECK(encoder_thread_.task_runner()->BelongsToCurrentThread()); |
233 base::AutoLock auto_lock(lock_); | 307 client_task_runner_->PostTask( |
234 | 308 FROM_HERE, base::Bind(&Client::NotifyError, client_, error)); |
235 // If the pool size does not match, speculatively reset the encoder to use | 309 } |
236 // the new size and return null. Cache the new frame size right away and | |
237 // toss away the pixel buffer pool to avoid spurious tasks until the encoder | |
238 // is done resetting. | |
239 if (frame_size != pool_frame_size_) { | |
240 DVLOG(1) << "MaybeCreateFrame: Detected frame size change."; | |
241 cast_environment_->PostTask( | |
242 CastEnvironment::MAIN, FROM_HERE, | |
243 base::Bind(&H264VideoToolboxEncoder::UpdateFrameSize, encoder_, | |
244 frame_size)); | |
245 pool_frame_size_ = frame_size; | |
246 pool_.reset(); | |
247 return nullptr; | |
248 } | |
249 | |
250 if (!pool_) { | |
251 DVLOG(1) << "MaybeCreateFrame: No pixel buffer pool."; | |
252 return nullptr; | |
253 } | |
254 | |
255 // Allocate a pixel buffer from the pool and return a wrapper VideoFrame. | |
256 base::ScopedCFTypeRef<CVPixelBufferRef> buffer; | |
257 auto status = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pool_, | |
258 buffer.InitializeInto()); | |
259 if (status != kCVReturnSuccess) { | |
260 DLOG(ERROR) << "CVPixelBufferPoolCreatePixelBuffer failed: " << status; | |
261 return nullptr; | |
262 } | |
263 | |
264 DCHECK(buffer); | |
265 return VideoFrame::WrapCVPixelBuffer(buffer, timestamp); | |
266 } | |
267 | |
268 void Update(const base::ScopedCFTypeRef<CVPixelBufferPoolRef>& pool, | |
269 const gfx::Size& frame_size) { | |
270 base::AutoLock auto_lock(lock_); | |
271 pool_ = pool; | |
272 pool_frame_size_ = frame_size; | |
273 } | |
274 | |
275 private: | |
276 friend class base::RefCountedThreadSafe<VideoFrameFactoryImpl>; | |
277 ~VideoFrameFactoryImpl() final {} | |
278 | |
279 base::Lock lock_; | |
280 base::ScopedCFTypeRef<CVPixelBufferPoolRef> pool_; | |
281 gfx::Size pool_frame_size_; | |
282 | |
283 // Weak back reference to the encoder and the cast envrionment so we can | |
284 // message the encoder when the frame size changes. | |
285 const base::WeakPtr<H264VideoToolboxEncoder> encoder_; | |
286 const scoped_refptr<CastEnvironment> cast_environment_; | |
287 | |
288 DISALLOW_COPY_AND_ASSIGN(VideoFrameFactoryImpl); | |
289 }; | |
290 | |
291 class H264VideoToolboxEncoder::VideoFrameFactoryImpl::Proxy | |
292 : public VideoFrameFactory { | |
293 public: | |
294 explicit Proxy( | |
295 const scoped_refptr<VideoFrameFactoryImpl>& video_frame_factory) | |
296 : video_frame_factory_(video_frame_factory) { | |
297 DCHECK(video_frame_factory_); | |
298 } | |
299 | |
300 scoped_refptr<VideoFrame> MaybeCreateFrame( | |
301 const gfx::Size& frame_size, | |
302 base::TimeDelta timestamp) final { | |
303 return video_frame_factory_->MaybeCreateFrame(frame_size, timestamp); | |
304 } | |
305 | |
306 private: | |
307 ~Proxy() final {} | |
308 | |
309 const scoped_refptr<VideoFrameFactoryImpl> video_frame_factory_; | |
310 | |
311 DISALLOW_COPY_AND_ASSIGN(Proxy); | |
312 }; | |
313 | 310 |
314 // static | 311 // static |
315 bool H264VideoToolboxEncoder::IsSupported( | 312 void VTVideoEncodeAccelerator::CompressionCallback(void* encoder_opaque, |
316 const VideoSenderConfig& video_config) { | 313 void* request_opaque, |
317 return video_config.codec == CODEC_VIDEO_H264 && VideoToolboxGlue::Get(); | 314 OSStatus status, |
318 } | 315 VTEncodeInfoFlags info, |
319 | 316 CMSampleBufferRef sbuf) { |
320 H264VideoToolboxEncoder::H264VideoToolboxEncoder( | 317 // This function may be called asynchronously, on a different thread from the |
321 const scoped_refptr<CastEnvironment>& cast_environment, | 318 // one that calls VTCompressionSessionEncodeFrame. |
322 const VideoSenderConfig& video_config, | 319 DVLOG(3) << __FUNCTION__; |
323 const StatusChangeCallback& status_change_cb) | 320 |
324 : cast_environment_(cast_environment), | 321 auto encoder = reinterpret_cast<VTVideoEncodeAccelerator*>(encoder_opaque); |
325 videotoolbox_glue_(VideoToolboxGlue::Get()), | 322 DCHECK(encoder); |
326 video_config_(video_config), | 323 |
327 status_change_cb_(status_change_cb), | 324 // Release InProgressFrameEncode, since we don't have support to return |
328 last_frame_id_(kFirstFrameId - 1), | 325 // timestamps at this point. |
329 encode_next_frame_as_keyframe_(false), | 326 scoped_ptr<InProgressFrameEncode> request( |
330 power_suspended_(false), | 327 reinterpret_cast<InProgressFrameEncode*>(request_opaque)); |
331 weak_factory_(this) { | 328 request.reset(); |
332 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); | 329 |
333 DCHECK(!status_change_cb_.is_null()); | 330 // CFRetain is required to hold onto CMSampleBufferRef when posting task |
334 | 331 // between threads. The object should be released later using CFRelease. |
335 OperationalStatus operational_status = | 332 CFRetain(sbuf); |
336 H264VideoToolboxEncoder::IsSupported(video_config) | 333 |
337 ? STATUS_INITIALIZED | 334 // This method is NOT called on |encoder_thread_|, so we still need to |
338 : STATUS_UNSUPPORTED_CODEC; | 335 // post a task back to it to do work. |
339 cast_environment_->PostTask( | 336 encoder->encoder_thread_.task_runner()->PostTask( |
340 CastEnvironment::MAIN, FROM_HERE, | 337 FROM_HERE, |
341 base::Bind(status_change_cb_, operational_status)); | 338 base::Bind(&VTVideoEncodeAccelerator::CompressionCallbackTask, |
342 | 339 encoder->weak_this_factory_.GetWeakPtr(), status, info, sbuf)); |
jfroy
2016/03/07 21:57:07
If this turns out to be weak, sbuf gets leaked. I'
emircan
2016/03/08 03:02:30
Good catch. I will defer the lifetime of this obje
| |
343 if (operational_status == STATUS_INITIALIZED) { | 340 } |
344 // Create the shared video frame factory. It persists for the combined | 341 |
345 // lifetime of the encoder and all video frame factory proxies created by | 342 void VTVideoEncodeAccelerator::CompressionCallbackTask(OSStatus status, |
346 // |CreateVideoFrameFactory| that reference it. | 343 VTEncodeInfoFlags info, |
347 video_frame_factory_ = | 344 CMSampleBufferRef sbuf) { |
jfroy
2016/03/07 21:57:07
Document that sbuf is retained and needs to be rel
emircan
2016/03/08 03:02:30
I defer the lifetime of this object to struct Enco
| |
348 scoped_refptr<VideoFrameFactoryImpl>(new VideoFrameFactoryImpl( | 345 DCHECK(encoder_thread_.task_runner()->BelongsToCurrentThread()); |
349 weak_factory_.GetWeakPtr(), cast_environment_)); | 346 |
350 | 347 if (status != noErr) { |
351 // Register for power state changes. | 348 DLOG(ERROR) << " encode failed: " << status; |
352 auto power_monitor = base::PowerMonitor::Get(); | 349 NotifyError(kPlatformFailureError); |
353 if (power_monitor) { | 350 return; |
354 power_monitor->AddObserver(this); | 351 } |
355 VLOG(1) << "Registered for power state changes."; | 352 |
356 } else { | 353 // If there isn't any BitstreamBuffer to copy into, add it to a queue for |
357 DLOG(WARNING) << "No power monitor. Process suspension will invalidate " | 354 // later use. |
358 "the encoder."; | 355 if (bitstream_buffer_queue_.empty()) { |
359 } | 356 scoped_ptr<EncodeOutput> encode_output(new EncodeOutput(info, sbuf)); |
360 } | 357 encoder_output_queue_.push_back(std::move(encode_output)); |
361 } | 358 return; |
362 | 359 } |
363 H264VideoToolboxEncoder::~H264VideoToolboxEncoder() { | 360 |
361 scoped_ptr<VTVideoEncodeAccelerator::BitstreamBufferRef> buffer_ref = | |
362 std::move(bitstream_buffer_queue_.front()); | |
363 bitstream_buffer_queue_.pop_front(); | |
364 ReturnBitstreamBuffer(info, sbuf, std::move(buffer_ref)); | |
365 } | |
366 | |
367 void VTVideoEncodeAccelerator::ReturnBitstreamBuffer( | |
368 VTEncodeInfoFlags info, | |
369 CMSampleBufferRef sbuf, | |
jfroy
2016/03/07 21:57:07
Document that sbuf is retained and needs to be rel
emircan
2016/03/08 03:02:30
sbuf will go out of scope when struct EncodeOutput
| |
370 scoped_ptr<VTVideoEncodeAccelerator::BitstreamBufferRef> buffer_ref) { | |
371 DVLOG(3) << __FUNCTION__; | |
372 DCHECK(encoder_thread_.task_runner()->BelongsToCurrentThread()); | |
373 | |
374 if (info & VideoToolboxGlue::kVTEncodeInfo_FrameDropped) { | |
375 DVLOG(2) << " frame dropped"; | |
376 CFRelease(sbuf); | |
377 client_task_runner_->PostTask( | |
378 FROM_HERE, base::Bind(&Client::BitstreamBufferReady, client_, | |
379 buffer_ref->id, 0, false)); | |
380 return; | |
381 } | |
382 | |
383 auto sample_attachments = static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex( | |
384 CoreMediaGlue::CMSampleBufferGetSampleAttachmentsArray(sbuf, true), 0)); | |
385 const bool keyframe = | |
386 !CFDictionaryContainsKey(sample_attachments, | |
387 CoreMediaGlue::kCMSampleAttachmentKey_NotSync()); | |
388 | |
389 size_t used_buffer_size = 0; | |
390 const bool copy_rv = media::video_toolbox::CopySampleBufferToAnnexBBuffer( | |
391 sbuf, keyframe, buffer_ref->size, | |
392 reinterpret_cast<char*>(buffer_ref->shm->memory()), &used_buffer_size); | |
393 CFRelease(sbuf); | |
394 if (!copy_rv) { | |
395 DLOG(ERROR) << "Cannot copy output from SampleBuffer to AnnexBBuffer."; | |
396 used_buffer_size = 0; | |
397 } | |
398 | |
399 client_task_runner_->PostTask( | |
400 FROM_HERE, base::Bind(&Client::BitstreamBufferReady, client_, | |
401 buffer_ref->id, used_buffer_size, keyframe)); | |
402 } | |
403 | |
404 bool VTVideoEncodeAccelerator::ResetCompressionSession() { | |
405 DCHECK(thread_checker_.CalledOnValidThread()); | |
406 | |
364 DestroyCompressionSession(); | 407 DestroyCompressionSession(); |
365 | 408 |
366 // If video_frame_factory_ is not null, the encoder registered for power state | 409 CFTypeRef attributes_keys[] = { |
367 // changes in the ctor and it must now unregister. | 410 kCVPixelBufferOpenGLCompatibilityKey, |
368 if (video_frame_factory_) { | 411 kCVPixelBufferIOSurfacePropertiesKey, |
369 auto power_monitor = base::PowerMonitor::Get(); | 412 kCVPixelBufferPixelFormatTypeKey |
370 if (power_monitor) | 413 }; |
371 power_monitor->RemoveObserver(this); | |
372 } | |
373 } | |
374 | |
375 void H264VideoToolboxEncoder::ResetCompressionSession() { | |
376 DCHECK(thread_checker_.CalledOnValidThread()); | |
377 | |
378 // Ignore reset requests while power suspended. | |
379 if (power_suspended_) | |
380 return; | |
381 | |
382 // Notify that we're resetting the encoder. | |
383 cast_environment_->PostTask( | |
384 CastEnvironment::MAIN, FROM_HERE, | |
385 base::Bind(status_change_cb_, STATUS_CODEC_REINIT_PENDING)); | |
386 | |
387 // Destroy the current session, if any. | |
388 DestroyCompressionSession(); | |
389 | |
390 // On OS X, allow the hardware encoder. Don't require it, it does not support | |
391 // all configurations (some of which are used for testing). | |
392 base::ScopedCFTypeRef<CFDictionaryRef> encoder_spec; | |
393 #if !defined(OS_IOS) | |
394 encoder_spec = DictionaryWithKeyValue( | |
395 videotoolbox_glue_ | |
396 ->kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder() , | |
397 kCFBooleanTrue); | |
398 #endif | |
399 | |
400 // Force 420v so that clients can easily use these buffers as GPU textures. | |
401 const int format[] = { | 414 const int format[] = { |
402 CoreVideoGlue::kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange}; | 415 CoreVideoGlue::kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange}; |
403 | 416 CFTypeRef attributes_values[] = { |
404 // Keep these attachment settings in-sync with those in ConfigureSession(). | 417 kCFBooleanTrue, |
405 CFTypeRef attachments_keys[] = {kCVImageBufferColorPrimariesKey, | 418 media::video_toolbox::DictionaryWithKeysAndValues(nullptr, nullptr, 0) |
406 kCVImageBufferTransferFunctionKey, | 419 .release(), |
407 kCVImageBufferYCbCrMatrixKey}; | 420 media::video_toolbox::ArrayWithIntegers(format, arraysize(format)) |
408 CFTypeRef attachments_values[] = {kCVImageBufferColorPrimaries_ITU_R_709_2, | 421 .release()}; |
409 kCVImageBufferTransferFunction_ITU_R_709_2, | 422 const base::ScopedCFTypeRef<CFDictionaryRef> attributes = |
410 kCVImageBufferYCbCrMatrix_ITU_R_709_2}; | 423 media::video_toolbox::DictionaryWithKeysAndValues( |
411 CFTypeRef buffer_attributes_keys[] = {kCVPixelBufferPixelFormatTypeKey, | 424 attributes_keys, attributes_values, arraysize(attributes_keys)); |
412 kCVBufferPropagatedAttachmentsKey}; | 425 for (auto& v : attributes_values) |
413 CFTypeRef buffer_attributes_values[] = { | |
414 ArrayWithIntegers(format, arraysize(format)).release(), | |
415 DictionaryWithKeysAndValues(attachments_keys, attachments_values, | |
416 arraysize(attachments_keys)).release()}; | |
417 const base::ScopedCFTypeRef<CFDictionaryRef> buffer_attributes = | |
418 DictionaryWithKeysAndValues(buffer_attributes_keys, | |
419 buffer_attributes_values, | |
420 arraysize(buffer_attributes_keys)); | |
421 for (auto& v : buffer_attributes_values) | |
422 CFRelease(v); | 426 CFRelease(v); |
423 | 427 |
428 bool session_rv = CreateCompressionSession(attributes, true); | |
429 if (!session_rv) { | |
430 // Try creating session again without forcing HW encode. | |
431 DestroyCompressionSession(); | |
432 session_rv = CreateCompressionSession(attributes, false); | |
433 if (!session_rv) { | |
434 DestroyCompressionSession(); | |
435 return false; | |
436 } | |
437 } | |
438 | |
439 const bool configure_rv = ConfigureCompressionSession(); | |
440 RequestEncodingParametersChange(target_bitrate_, frame_rate_); | |
441 return configure_rv; | |
442 } | |
443 | |
444 bool VTVideoEncodeAccelerator::CreateCompressionSession( | |
445 base::ScopedCFTypeRef<CFDictionaryRef> attributes, | |
446 bool require_hw_encoding) { | |
447 DCHECK(thread_checker_.CalledOnValidThread()); | |
448 | |
449 std::vector<CFTypeRef> encoder_keys; | |
450 std::vector<CFTypeRef> encoder_values; | |
451 encoder_keys.push_back(videotoolbox_glue_ | |
452 ->kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder()); | |
453 encoder_values.push_back(kCFBooleanTrue); | |
454 | |
455 if (require_hw_encoding) { | |
456 encoder_keys.push_back( | |
457 videotoolbox_glue_ | |
458 ->kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder()); | |
459 encoder_values.push_back(kCFBooleanTrue); | |
460 } | |
461 base::ScopedCFTypeRef<CFDictionaryRef> encoder_spec = | |
462 media::video_toolbox::DictionaryWithKeysAndValues( | |
463 encoder_keys.data(), encoder_values.data(), encoder_keys.size()); | |
464 | |
424 // Create the compression session. | 465 // Create the compression session. |
425 | |
426 // Note that the encoder object is given to the compression session as the | 466 // Note that the encoder object is given to the compression session as the |
427 // callback context using a raw pointer. The C API does not allow us to use a | 467 // callback context using a raw pointer. The C API does not allow us to use a |
428 // smart pointer, nor is this encoder ref counted. However, this is still | 468 // smart pointer, nor is this encoder ref counted. However, this is still |
429 // safe, because we 1) we own the compression session and 2) we tear it down | 469 // safe, because we 1) we own the compression session and 2) we tear it down |
430 // safely. When destructing the encoder, the compression session is flushed | 470 // safely. When destructing the encoder, the compression session is flushed |
431 // and invalidated. Internally, VideoToolbox will join all of its threads | 471 // and invalidated. Internally, VideoToolbox will join all of its threads |
432 // before returning to the client. Therefore, when control returns to us, we | 472 // before returning to the client. Therefore, when control returns to us, we |
433 // are guaranteed that the output callback will not execute again. | 473 // are guaranteed that the output callback will not execute again. |
434 OSStatus status = videotoolbox_glue_->VTCompressionSessionCreate( | 474 OSStatus status = videotoolbox_glue_->VTCompressionSessionCreate( |
435 kCFAllocatorDefault, frame_size_.width(), frame_size_.height(), | 475 kCFAllocatorDefault, |
436 CoreMediaGlue::kCMVideoCodecType_H264, encoder_spec, buffer_attributes, | 476 input_visible_size_.width(), |
477 input_visible_size_.height(), | |
478 CoreMediaGlue::kCMVideoCodecType_H264, | |
479 encoder_spec, | |
480 attributes, | |
437 nullptr /* compressedDataAllocator */, | 481 nullptr /* compressedDataAllocator */, |
438 &H264VideoToolboxEncoder::CompressionCallback, | 482 &VTVideoEncodeAccelerator::CompressionCallback, |
439 reinterpret_cast<void*>(this), compression_session_.InitializeInto()); | 483 reinterpret_cast<void*>(this), |
484 compression_session_.InitializeInto()); | |
440 if (status != noErr) { | 485 if (status != noErr) { |
441 DLOG(ERROR) << " VTCompressionSessionCreate failed: " << status; | 486 DLOG(ERROR) << " VTCompressionSessionCreate failed: " << status; |
442 // Notify that reinitialization has failed. | 487 return false; |
443 cast_environment_->PostTask( | 488 } |
444 CastEnvironment::MAIN, FROM_HERE, | 489 DVLOG(3) << " VTCompressionSession created with HW encode: " |
445 base::Bind(status_change_cb_, STATUS_CODEC_INIT_FAILED)); | 490 << require_hw_encoding; |
446 return; | 491 return true; |
447 } | 492 } |
448 | 493 |
449 // Configure the session (apply session properties based on the current state | 494 bool VTVideoEncodeAccelerator::ConfigureCompressionSession() { |
450 // of the encoder, experimental tuning and requirements). | 495 DCHECK(thread_checker_.CalledOnValidThread()); |
451 ConfigureCompressionSession(); | 496 DCHECK(compression_session_); |
452 | 497 |
453 // Update the video frame factory. | 498 media::video_toolbox::SessionPropertySetter session_property_setter( |
454 base::ScopedCFTypeRef<CVPixelBufferPoolRef> pool( | 499 compression_session_, videotoolbox_glue_); |
455 videotoolbox_glue_->VTCompressionSessionGetPixelBufferPool( | 500 bool rv = true; |
456 compression_session_), | 501 rv &= session_property_setter.SetSessionProperty( |
457 base::scoped_policy::RETAIN); | |
458 video_frame_factory_->Update(pool, frame_size_); | |
459 | |
460 // Notify that reinitialization is done. | |
461 cast_environment_->PostTask( | |
462 CastEnvironment::MAIN, FROM_HERE, | |
463 base::Bind(status_change_cb_, STATUS_INITIALIZED)); | |
464 } | |
465 | |
466 void H264VideoToolboxEncoder::ConfigureCompressionSession() { | |
467 SetSessionProperty( | |
468 videotoolbox_glue_->kVTCompressionPropertyKey_ProfileLevel(), | 502 videotoolbox_glue_->kVTCompressionPropertyKey_ProfileLevel(), |
469 videotoolbox_glue_->kVTProfileLevel_H264_Main_AutoLevel()); | 503 videotoolbox_glue_->kVTProfileLevel_H264_Baseline_AutoLevel()); |
470 SetSessionProperty(videotoolbox_glue_->kVTCompressionPropertyKey_RealTime(), | 504 rv &= session_property_setter.SetSessionProperty( |
471 true); | 505 videotoolbox_glue_->kVTCompressionPropertyKey_RealTime(), true); |
472 SetSessionProperty( | 506 rv &= session_property_setter.SetSessionProperty( |
473 videotoolbox_glue_->kVTCompressionPropertyKey_AllowFrameReordering(), | 507 videotoolbox_glue_->kVTCompressionPropertyKey_AllowFrameReordering(), |
474 false); | 508 false); |
475 SetSessionProperty( | 509 DLOG_IF(ERROR, !rv) << " SetSessionProperty failed."; |
476 videotoolbox_glue_->kVTCompressionPropertyKey_MaxKeyFrameInterval(), 240); | 510 return rv; |
477 SetSessionProperty( | 511 } |
478 videotoolbox_glue_ | 512 |
479 ->kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration(), | 513 void VTVideoEncodeAccelerator::DestroyCompressionSession() { |
480 240); | 514 // This method may be called on |encoder thread| or GPU child thread. |
481 // TODO(jfroy): implement better bitrate control | 515 |
482 // https://crbug.com/425352 | |
483 SetSessionProperty( | |
484 videotoolbox_glue_->kVTCompressionPropertyKey_AverageBitRate(), | |
485 (video_config_.min_bitrate + video_config_.max_bitrate) / 2); | |
486 SetSessionProperty( | |
487 videotoolbox_glue_->kVTCompressionPropertyKey_ExpectedFrameRate(), | |
488 video_config_.max_frame_rate); | |
489 // Keep these attachment settings in-sync with those in Initialize(). | |
490 SetSessionProperty( | |
491 videotoolbox_glue_->kVTCompressionPropertyKey_ColorPrimaries(), | |
492 kCVImageBufferColorPrimaries_ITU_R_709_2); | |
493 SetSessionProperty( | |
494 videotoolbox_glue_->kVTCompressionPropertyKey_TransferFunction(), | |
495 kCVImageBufferTransferFunction_ITU_R_709_2); | |
496 SetSessionProperty( | |
497 videotoolbox_glue_->kVTCompressionPropertyKey_YCbCrMatrix(), | |
498 kCVImageBufferYCbCrMatrix_ITU_R_709_2); | |
499 if (video_config_.max_number_of_video_buffers_used > 0) { | |
500 SetSessionProperty( | |
501 videotoolbox_glue_->kVTCompressionPropertyKey_MaxFrameDelayCount(), | |
502 video_config_.max_number_of_video_buffers_used); | |
503 } | |
504 } | |
505 | |
506 void H264VideoToolboxEncoder::DestroyCompressionSession() { | |
507 DCHECK(thread_checker_.CalledOnValidThread()); | |
508 | |
509 // If the compression session exists, invalidate it. This blocks until all | |
510 // pending output callbacks have returned and any internal threads have | |
511 // joined, ensuring no output callback ever sees a dangling encoder pointer. | |
512 // | |
513 // Before destroying the compression session, the video frame factory's pool | |
514 // is updated to null so that no thread will produce new video frames via the | |
515 // factory until a new compression session is created. The current frame size | |
516 // is passed to prevent the video frame factory from posting |UpdateFrameSize| | |
517 // tasks. Indeed, |DestroyCompressionSession| is either called from | |
518 // |ResetCompressionSession|, in which case a new pool and frame size will be | |
519 // set, or from callsites that require that there be no compression session | |
520 // (ex: the dtor). | |
521 if (compression_session_) { | 516 if (compression_session_) { |
522 video_frame_factory_->Update( | |
523 base::ScopedCFTypeRef<CVPixelBufferPoolRef>(nullptr), frame_size_); | |
524 videotoolbox_glue_->VTCompressionSessionInvalidate(compression_session_); | 517 videotoolbox_glue_->VTCompressionSessionInvalidate(compression_session_); |
525 compression_session_.reset(); | 518 compression_session_.reset(); |
526 } | 519 } |
527 } | 520 } |
528 | 521 |
529 bool H264VideoToolboxEncoder::EncodeVideoFrame( | 522 } // namespace content |
530 const scoped_refptr<media::VideoFrame>& video_frame, | |
531 const base::TimeTicks& reference_time, | |
532 const FrameEncodedCallback& frame_encoded_callback) { | |
533 DCHECK(thread_checker_.CalledOnValidThread()); | |
534 DCHECK(!frame_encoded_callback.is_null()); | |
535 | |
536 // Reject empty video frames. | |
537 const gfx::Size frame_size = video_frame->visible_rect().size(); | |
538 if (frame_size.IsEmpty()) { | |
539 DVLOG(1) << "Rejecting empty video frame."; | |
540 return false; | |
541 } | |
542 | |
543 // Handle frame size changes. This will reset the compression session. | |
544 if (frame_size != frame_size_) { | |
545 DVLOG(1) << "EncodeVideoFrame: Detected frame size change."; | |
546 UpdateFrameSize(frame_size); | |
547 } | |
548 | |
549 // Need a compression session to continue. | |
550 if (!compression_session_) { | |
551 DLOG(ERROR) << "No compression session."; | |
552 return false; | |
553 } | |
554 | |
555 // Wrap the VideoFrame in a CVPixelBuffer. In all cases, no data will be | |
556 // copied. If the VideoFrame was created by this encoder's video frame | |
557 // factory, then the returned CVPixelBuffer will have been obtained from the | |
558 // compression session's pixel buffer pool. This will eliminate a copy of the | |
559 // frame into memory visible by the hardware encoder. The VideoFrame's | |
560 // lifetime is extended for the lifetime of the returned CVPixelBuffer. | |
561 auto pixel_buffer = media::WrapVideoFrameInCVPixelBuffer(*video_frame); | |
562 if (!pixel_buffer) { | |
563 DLOG(ERROR) << "WrapVideoFrameInCVPixelBuffer failed."; | |
564 return false; | |
565 } | |
566 | |
567 // Convert the frame timestamp to CMTime. | |
568 auto timestamp_cm = CoreMediaGlue::CMTimeMake( | |
569 (reference_time - base::TimeTicks()).InMicroseconds(), USEC_PER_SEC); | |
570 | |
571 // Wrap information we'll need after the frame is encoded in a heap object. | |
572 // We'll get the pointer back from the VideoToolbox completion callback. | |
573 scoped_ptr<InProgressFrameEncode> request(new InProgressFrameEncode( | |
574 RtpTimeTicks::FromTimeDelta(video_frame->timestamp(), kVideoFrequency), | |
575 reference_time, frame_encoded_callback)); | |
576 | |
577 // Build a suitable frame properties dictionary for keyframes. | |
578 base::ScopedCFTypeRef<CFDictionaryRef> frame_props; | |
579 if (encode_next_frame_as_keyframe_) { | |
580 frame_props = DictionaryWithKeyValue( | |
581 videotoolbox_glue_->kVTEncodeFrameOptionKey_ForceKeyFrame(), | |
582 kCFBooleanTrue); | |
583 encode_next_frame_as_keyframe_ = false; | |
584 } | |
585 | |
586 // Submit the frame to the compression session. The function returns as soon | |
587 // as the frame has been enqueued. | |
588 OSStatus status = videotoolbox_glue_->VTCompressionSessionEncodeFrame( | |
589 compression_session_, pixel_buffer, timestamp_cm, | |
590 CoreMediaGlue::CMTime{0, 0, 0, 0}, frame_props, | |
591 reinterpret_cast<void*>(request.release()), nullptr); | |
592 if (status != noErr) { | |
593 DLOG(ERROR) << " VTCompressionSessionEncodeFrame failed: " << status; | |
594 return false; | |
595 } | |
596 | |
597 return true; | |
598 } | |
599 | |
600 void H264VideoToolboxEncoder::UpdateFrameSize(const gfx::Size& size_needed) { | |
601 DCHECK(thread_checker_.CalledOnValidThread()); | |
602 | |
603 // Our video frame factory posts a task to update the frame size when its | |
604 // cache of the frame size differs from what the client requested. To avoid | |
605 // spurious encoder resets, check again here. | |
606 if (size_needed == frame_size_) { | |
607 DCHECK(compression_session_); | |
608 return; | |
609 } | |
610 | |
611 VLOG(1) << "Resetting compression session (for frame size change from " | |
612 << frame_size_.ToString() << " to " << size_needed.ToString() << ")."; | |
613 | |
614 // If there is an existing session, finish every pending frame. | |
615 if (compression_session_) { | |
616 EmitFrames(); | |
617 } | |
618 | |
619 // Store the new frame size. | |
620 frame_size_ = size_needed; | |
621 | |
622 // Reset the compression session. | |
623 ResetCompressionSession(); | |
624 } | |
625 | |
626 void H264VideoToolboxEncoder::SetBitRate(int /*new_bit_rate*/) { | |
627 DCHECK(thread_checker_.CalledOnValidThread()); | |
628 // VideoToolbox does not seem to support bitrate reconfiguration. | |
629 } | |
630 | |
631 void H264VideoToolboxEncoder::GenerateKeyFrame() { | |
632 DCHECK(thread_checker_.CalledOnValidThread()); | |
633 encode_next_frame_as_keyframe_ = true; | |
634 } | |
635 | |
636 scoped_ptr<VideoFrameFactory> | |
637 H264VideoToolboxEncoder::CreateVideoFrameFactory() { | |
638 DCHECK(thread_checker_.CalledOnValidThread()); | |
639 return scoped_ptr<VideoFrameFactory>( | |
640 new VideoFrameFactoryImpl::Proxy(video_frame_factory_)); | |
641 } | |
642 | |
643 void H264VideoToolboxEncoder::EmitFrames() { | |
644 DCHECK(thread_checker_.CalledOnValidThread()); | |
645 if (!compression_session_) | |
646 return; | |
647 | |
648 OSStatus status = videotoolbox_glue_->VTCompressionSessionCompleteFrames( | |
649 compression_session_, CoreMediaGlue::CMTime{0, 0, 0, 0}); | |
650 if (status != noErr) { | |
651 DLOG(ERROR) << " VTCompressionSessionCompleteFrames failed: " << status; | |
652 } | |
653 } | |
654 | |
655 void H264VideoToolboxEncoder::OnSuspend() { | |
656 VLOG(1) | |
657 << "OnSuspend: Emitting all frames and destroying compression session."; | |
658 EmitFrames(); | |
659 DestroyCompressionSession(); | |
660 power_suspended_ = true; | |
661 } | |
662 | |
663 void H264VideoToolboxEncoder::OnResume() { | |
664 power_suspended_ = false; | |
665 | |
666 // Reset the compression session only if the frame size is not zero (which | |
667 // will obviously fail). It is possible for the frame size to be zero if no | |
668 // frame was submitted for encoding or requested from the video frame factory | |
669 // before suspension. | |
670 if (!frame_size_.IsEmpty()) { | |
671 VLOG(1) << "OnResume: Resetting compression session."; | |
672 ResetCompressionSession(); | |
673 } | |
674 } | |
675 | |
676 bool H264VideoToolboxEncoder::SetSessionProperty(CFStringRef key, | |
677 int32_t value) { | |
678 base::ScopedCFTypeRef<CFNumberRef> cfvalue( | |
679 CFNumberCreate(nullptr, kCFNumberSInt32Type, &value)); | |
680 return videotoolbox_glue_->VTSessionSetProperty(compression_session_, key, | |
681 cfvalue) == noErr; | |
682 } | |
683 | |
684 bool H264VideoToolboxEncoder::SetSessionProperty(CFStringRef key, bool value) { | |
685 CFBooleanRef cfvalue = (value) ? kCFBooleanTrue : kCFBooleanFalse; | |
686 return videotoolbox_glue_->VTSessionSetProperty(compression_session_, key, | |
687 cfvalue) == noErr; | |
688 } | |
689 | |
690 bool H264VideoToolboxEncoder::SetSessionProperty(CFStringRef key, | |
691 CFStringRef value) { | |
692 return videotoolbox_glue_->VTSessionSetProperty(compression_session_, key, | |
693 value) == noErr; | |
694 } | |
695 | |
696 void H264VideoToolboxEncoder::CompressionCallback(void* encoder_opaque, | |
697 void* request_opaque, | |
698 OSStatus status, | |
699 VTEncodeInfoFlags info, | |
700 CMSampleBufferRef sbuf) { | |
701 auto encoder = reinterpret_cast<H264VideoToolboxEncoder*>(encoder_opaque); | |
702 const scoped_ptr<InProgressFrameEncode> request( | |
703 reinterpret_cast<InProgressFrameEncode*>(request_opaque)); | |
704 bool keyframe = false; | |
705 bool has_frame_data = false; | |
706 | |
707 if (status != noErr) { | |
708 DLOG(ERROR) << " encoding failed: " << status; | |
709 encoder->cast_environment_->PostTask( | |
710 CastEnvironment::MAIN, FROM_HERE, | |
711 base::Bind(encoder->status_change_cb_, STATUS_CODEC_RUNTIME_ERROR)); | |
712 } else if ((info & VideoToolboxGlue::kVTEncodeInfo_FrameDropped)) { | |
713 DVLOG(2) << " frame dropped"; | |
714 } else { | |
715 auto sample_attachments = | |
716 static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex( | |
717 CoreMediaGlue::CMSampleBufferGetSampleAttachmentsArray(sbuf, true), | |
718 0)); | |
719 | |
720 // If the NotSync key is not present, it implies Sync, which indicates a | |
721 // keyframe (at least I think, VT documentation is, erm, sparse). Could | |
722 // alternatively use kCMSampleAttachmentKey_DependsOnOthers == false. | |
723 keyframe = !CFDictionaryContainsKey( | |
724 sample_attachments, | |
725 CoreMediaGlue::kCMSampleAttachmentKey_NotSync()); | |
726 has_frame_data = true; | |
727 } | |
728 | |
729 // Increment the encoder-scoped frame id and assign the new value to this | |
730 // frame. VideoToolbox calls the output callback serially, so this is safe. | |
731 const uint32_t frame_id = ++encoder->last_frame_id_; | |
732 | |
733 scoped_ptr<SenderEncodedFrame> encoded_frame(new SenderEncodedFrame()); | |
734 encoded_frame->frame_id = frame_id; | |
735 encoded_frame->reference_time = request->reference_time; | |
736 encoded_frame->rtp_timestamp = request->rtp_timestamp; | |
737 if (keyframe) { | |
738 encoded_frame->dependency = EncodedFrame::KEY; | |
739 encoded_frame->referenced_frame_id = frame_id; | |
740 } else { | |
741 encoded_frame->dependency = EncodedFrame::DEPENDENT; | |
742 // H.264 supports complex frame reference schemes (multiple reference | |
743 // frames, slice references, backward and forward references, etc). Cast | |
744 // doesn't support the concept of forward-referencing frame dependencies or | |
745 // multiple frame dependencies; so pretend that all frames are only | |
746 // decodable after their immediately preceding frame is decoded. This will | |
747 // ensure a Cast receiver only attempts to decode the frames sequentially | |
748 // and in order. Furthermore, the encoder is configured to never use forward | |
749 // references (see |kVTCompressionPropertyKey_AllowFrameReordering|). There | |
750 // is no way to prevent multiple reference frames. | |
751 encoded_frame->referenced_frame_id = frame_id - 1; | |
752 } | |
753 | |
754 if (has_frame_data) | |
755 CopySampleBufferToAnnexBBuffer(sbuf, &encoded_frame->data, keyframe); | |
756 | |
757 // TODO(miu): Compute and populate the |deadline_utilization| and | |
758 // |lossy_utilization| performance metrics in |encoded_frame|. | |
759 | |
760 encoded_frame->encode_completion_time = | |
761 encoder->cast_environment_->Clock()->NowTicks(); | |
762 encoder->cast_environment_->PostTask( | |
763 CastEnvironment::MAIN, FROM_HERE, | |
764 base::Bind(request->frame_encoded_callback, | |
765 base::Passed(&encoded_frame))); | |
766 } | |
767 | |
768 } // namespace cast | |
769 } // namespace media | |
OLD | NEW |