| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Modifications Copyright 2017 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef STARBOARD_SHARED_STARBOARD_PLAYER_FILTER_DECODED_AUDIO_QUEUE_H_ |
| #define STARBOARD_SHARED_STARBOARD_PLAYER_FILTER_DECODED_AUDIO_QUEUE_H_ |
| |
| #include <deque> |
| |
| #include "starboard/configuration.h" |
| #include "starboard/shared/starboard/player/decoded_audio_internal.h" |
| #include "starboard/types.h" |
| |
| namespace starboard { |
| namespace shared { |
| namespace starboard { |
| namespace player { |
| namespace filter { |
| |
| // A queue of AudioBuffers to support reading of arbitrary chunks of a media |
| // data source. Audio data can be copied into an DecodedAudio for output. The |
| // current position can be forwarded to anywhere in the buffered data. |
| // |
| // This class is not inherently thread-safe. Concurrent access must be |
| // externally serialized. |
| class DecodedAudioQueue { |
| public: |
| DecodedAudioQueue(); |
| ~DecodedAudioQueue(); |
| |
| // Clears the buffer queue. |
| void Clear(); |
| |
| // Appends |decoded_audio| to this queue. |
| void Append(const scoped_refptr<DecodedAudio>& decoded_audio); |
| |
| // Reads a maximum of |frames| frames into |dest| from the current position. |
| // Returns the number of frames read. The current position will advance by the |
| // amount of frames read. |dest_frame_offset| specifies a starting offset into |
| // |dest|. On each call, the frames are converted from their source format |
| // into the destination DecodedAudio. |
| int ReadFrames(int frames, int dest_frame_offset, DecodedAudio* dest); |
| |
| // Copies up to |frames| frames from current position to |dest|. Returns |
| // number of frames copied. Doesn't advance current position. Starts at |
| // |source_frame_offset| from current position. |dest_frame_offset| specifies |
| // a starting offset into |dest|. On each call, the frames are converted from |
| // their source format into the destination DecodedAudio. |
| int PeekFrames(int frames, |
| int source_frame_offset, |
| int dest_frame_offset, |
| DecodedAudio* dest); |
| |
| // Moves the current position forward by |frames| frames. If |frames| exceeds |
| // frames available, the seek operation will fail. |
| void SeekFrames(int frames); |
| |
| // Returns the number of frames buffered beyond the current position. |
| int frames() const { return frames_; } |
| |
| private: |
| // Definition of the buffer queue. |
| typedef std::deque<scoped_refptr<DecodedAudio> > BufferQueue; |
| |
| // An internal method shared by ReadFrames() and SeekFrames() that actually |
| // does reading. It reads a maximum of |frames| frames into |dest|. Returns |
| // the number of frames read. The current position will be moved forward by |
| // the number of frames read if |advance_position| is set. If |dest| is NULL, |
| // only the current position will advance but no data will be copied. |
| // |source_frame_offset| can be used to skip frames before reading. |
| // |dest_frame_offset| specifies a starting offset into |dest|. |
| int InternalRead(int frames, |
| bool advance_position, |
| int source_frame_offset, |
| int dest_frame_offset, |
| DecodedAudio* dest); |
| |
| BufferQueue::iterator current_buffer_; |
| BufferQueue buffers_; |
| int current_buffer_offset_; |
| |
| // Number of frames available to be read in the buffer. |
| int frames_; |
| |
| SB_DISALLOW_COPY_AND_ASSIGN(DecodedAudioQueue); |
| }; |
| |
| } // namespace filter |
| } // namespace player |
| } // namespace starboard |
| } // namespace shared |
| } // namespace starboard |
| |
| #endif // STARBOARD_SHARED_STARBOARD_PLAYER_FILTER_DECODED_AUDIO_QUEUE_H_ |