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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // MSVC++ requires this to be set before any other includes to get M_PI. | 5 // MSVC++ requires this to be set before any other includes to get M_PI. |
6 #define _USE_MATH_DEFINES | 6 #define _USE_MATH_DEFINES |
7 | 7 |
8 #include <cmath> | 8 #include <cmath> |
9 | 9 |
10 #include "media/base/fake_audio_render_callback.h" | 10 #include "media/base/fake_audio_render_callback.h" |
11 | 11 |
12 namespace media { | 12 namespace media { |
13 | 13 |
14 FakeAudioRenderCallback::FakeAudioRenderCallback(double step) | 14 FakeAudioRenderCallback::FakeAudioRenderCallback(double step) |
15 : half_fill_(false), | 15 : half_fill_(false), |
16 step_(step), | 16 step_(step), |
17 last_audio_delay_milliseconds_(-1), | 17 last_frames_delayed_(-1), |
18 last_channel_count_(-1), | 18 last_channel_count_(-1), |
19 volume_(1) { | 19 volume_(1) { |
20 reset(); | 20 reset(); |
21 } | 21 } |
22 | 22 |
23 FakeAudioRenderCallback::~FakeAudioRenderCallback() {} | 23 FakeAudioRenderCallback::~FakeAudioRenderCallback() {} |
24 | 24 |
25 int FakeAudioRenderCallback::Render(AudioBus* audio_bus, | 25 int FakeAudioRenderCallback::Render(AudioBus* audio_bus, |
26 uint32_t audio_delay_milliseconds, | 26 uint32_t frames_delayed, |
27 uint32_t frames_skipped) { | 27 uint32_t frames_skipped) { |
28 last_audio_delay_milliseconds_ = audio_delay_milliseconds; | 28 DCHECK_LE(frames_delayed, static_cast<uint32_t>(INT_MAX)); |
| 29 last_frames_delayed_ = static_cast<int>(frames_delayed); |
| 30 |
29 last_channel_count_ = audio_bus->channels(); | 31 last_channel_count_ = audio_bus->channels(); |
30 | 32 |
31 int number_of_frames = audio_bus->frames(); | 33 int number_of_frames = audio_bus->frames(); |
32 if (half_fill_) | 34 if (half_fill_) |
33 number_of_frames /= 2; | 35 number_of_frames /= 2; |
34 | 36 |
35 // Fill first channel with a sine wave. | 37 // Fill first channel with a sine wave. |
36 for (int i = 0; i < number_of_frames; ++i) | 38 for (int i = 0; i < number_of_frames; ++i) |
37 audio_bus->channel(0)[i] = sin(2 * M_PI * (x_ + step_ * i)); | 39 audio_bus->channel(0)[i] = sin(2 * M_PI * (x_ + step_ * i)); |
38 x_ += number_of_frames * step_; | 40 x_ += number_of_frames * step_; |
39 | 41 |
40 // Copy first channel into the rest of the channels. | 42 // Copy first channel into the rest of the channels. |
41 for (int i = 1; i < audio_bus->channels(); ++i) | 43 for (int i = 1; i < audio_bus->channels(); ++i) |
42 memcpy(audio_bus->channel(i), audio_bus->channel(0), | 44 memcpy(audio_bus->channel(i), audio_bus->channel(0), |
43 number_of_frames * sizeof(*audio_bus->channel(i))); | 45 number_of_frames * sizeof(*audio_bus->channel(i))); |
44 | 46 |
45 return number_of_frames; | 47 return number_of_frames; |
46 } | 48 } |
47 | 49 |
48 double FakeAudioRenderCallback::ProvideInput(AudioBus* audio_bus, | 50 double FakeAudioRenderCallback::ProvideInput(AudioBus* audio_bus, |
49 base::TimeDelta buffer_delay) { | 51 uint32_t frames_delayed) { |
50 Render(audio_bus, buffer_delay.InMillisecondsF() + 0.5, 0); | 52 Render(audio_bus, frames_delayed, 0); |
51 return volume_; | 53 return volume_; |
52 } | 54 } |
53 | 55 |
54 } // namespace media | 56 } // namespace media |
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