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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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/base/filter_host.h" | 5 #include "media/base/filter_host.h" |
| 6 #include "media/filters/audio_renderer_base.h" | 6 #include "media/filters/audio_renderer_base.h" |
| 7 | 7 |
| 8 namespace media { | 8 namespace media { |
| 9 | 9 |
| 10 // The maximum size of the queue, which also acts as the number of initial reads | 10 // The maximum size of the queue, which also acts as the number of initial reads |
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| 82 // the target queue size or the stream has ended. | 82 // the target queue size or the stream has ended. |
| 83 if (queue_.size() == max_queue_size_ || buffer_in->IsEndOfStream()) | 83 if (queue_.size() == max_queue_size_ || buffer_in->IsEndOfStream()) |
| 84 initialization_complete = true; | 84 initialization_complete = true; |
| 85 } | 85 } |
| 86 } | 86 } |
| 87 | 87 |
| 88 if (initialization_complete) { | 88 if (initialization_complete) { |
| 89 if (queue_.empty()) { | 89 if (queue_.empty()) { |
| 90 // If we say we have initialized but buffer queue is empty, raise an | 90 // If we say we have initialized but buffer queue is empty, raise an |
| 91 // error. | 91 // error. |
| 92 host_->Error(PIPELINE_ERROR_NO_DATA); | 92 host()->Error(PIPELINE_ERROR_NO_DATA); |
| 93 } else { | 93 } else { |
| 94 initialized_ = true; | 94 initialized_ = true; |
| 95 host_->InitializationComplete(); | 95 host()->InitializationComplete(); |
| 96 } | 96 } |
| 97 } | 97 } |
| 98 } | 98 } |
| 99 | 99 |
| 100 // TODO(scherkus): clean up FillBuffer().. it's overly complex!! | 100 // TODO(scherkus): clean up FillBuffer().. it's overly complex!! |
| 101 size_t AudioRendererBase::FillBuffer(uint8* dest, | 101 size_t AudioRendererBase::FillBuffer(uint8* dest, |
| 102 size_t dest_len, | 102 size_t dest_len, |
| 103 float rate, | 103 float rate, |
| 104 const base::TimeDelta& playback_delay) { | 104 const base::TimeDelta& playback_delay) { |
| 105 size_t buffers_released = 0; | 105 size_t buffers_released = 0; |
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| 203 // Update the pipeline's time if it was set last time. | 203 // Update the pipeline's time if it was set last time. |
| 204 if (last_fill_buffer_time.InMicroseconds() > 0) { | 204 if (last_fill_buffer_time.InMicroseconds() > 0) { |
| 205 // Adjust the |last_fill_buffer_time| with the playback delay. | 205 // Adjust the |last_fill_buffer_time| with the playback delay. |
| 206 // TODO(hclam): If there is a playback delay, the pipeline would not be | 206 // TODO(hclam): If there is a playback delay, the pipeline would not be |
| 207 // updated with a correct timestamp when the stream is played at the very | 207 // updated with a correct timestamp when the stream is played at the very |
| 208 // end since we use decoded packets to trigger time updates. A better | 208 // end since we use decoded packets to trigger time updates. A better |
| 209 // solution is to start a timer when an audio packet is decoded to allow | 209 // solution is to start a timer when an audio packet is decoded to allow |
| 210 // finer time update events. | 210 // finer time update events. |
| 211 if (playback_delay < last_fill_buffer_time) | 211 if (playback_delay < last_fill_buffer_time) |
| 212 last_fill_buffer_time -= playback_delay; | 212 last_fill_buffer_time -= playback_delay; |
| 213 host_->SetTime(last_fill_buffer_time); | 213 host()->SetTime(last_fill_buffer_time); |
| 214 } | 214 } |
| 215 | 215 |
| 216 return dest_written; | 216 return dest_written; |
| 217 } | 217 } |
| 218 | 218 |
| 219 void AudioRendererBase::ScheduleRead() { | 219 void AudioRendererBase::ScheduleRead() { |
| 220 decoder_->Read(NewCallback(this, &AudioRendererBase::OnReadComplete)); | 220 decoder_->Read(NewCallback(this, &AudioRendererBase::OnReadComplete)); |
| 221 } | 221 } |
| 222 | 222 |
| 223 // static | 223 // static |
| 224 bool AudioRendererBase::ParseMediaFormat(const MediaFormat& media_format, | 224 bool AudioRendererBase::ParseMediaFormat(const MediaFormat& media_format, |
| 225 int* channels_out, | 225 int* channels_out, |
| 226 int* sample_rate_out, | 226 int* sample_rate_out, |
| 227 int* sample_bits_out) { | 227 int* sample_bits_out) { |
| 228 // TODO(scherkus): might be handy to support NULL parameters. | 228 // TODO(scherkus): might be handy to support NULL parameters. |
| 229 std::string mime_type; | 229 std::string mime_type; |
| 230 return media_format.GetAsString(MediaFormat::kMimeType, &mime_type) && | 230 return media_format.GetAsString(MediaFormat::kMimeType, &mime_type) && |
| 231 media_format.GetAsInteger(MediaFormat::kChannels, channels_out) && | 231 media_format.GetAsInteger(MediaFormat::kChannels, channels_out) && |
| 232 media_format.GetAsInteger(MediaFormat::kSampleRate, sample_rate_out) && | 232 media_format.GetAsInteger(MediaFormat::kSampleRate, sample_rate_out) && |
| 233 media_format.GetAsInteger(MediaFormat::kSampleBits, sample_bits_out) && | 233 media_format.GetAsInteger(MediaFormat::kSampleBits, sample_bits_out) && |
| 234 mime_type.compare(mime_type::kUncompressedAudio) == 0; | 234 mime_type.compare(mime_type::kUncompressedAudio) == 0; |
| 235 } | 235 } |
| 236 | 236 |
| 237 } // namespace media | 237 } // namespace media |
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