blob: a5697028cdbc4e4c71ad6343a6eebd1ea33fed36 [file] [log] [blame]
// Copyright 2018 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.
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
namespace chromecast {
namespace media {
class DecoderBufferBase;
} // namespace media
// The audio resampler allows us to apply small changes to the rate of audio
// playback via (supposedly) imperceptible changes.
// Note: only works for planar float data.
class AudioResampler {
explicit AudioResampler(size_t channel_count);
// Sets the effective media clock rate.
double SetMediaClockRate(double rate);
// Resamples a buffer, adding or dropping frames as necessary to match the
// media clock rate.
scoped_refptr<media::DecoderBufferBase> ResampleBuffer(
scoped_refptr<media::DecoderBufferBase> buffer);
// Adds a frame to a buffer.
scoped_refptr<media::DecoderBufferBase> LengthenBuffer(
scoped_refptr<media::DecoderBufferBase> buffer);
// Cuts a frame from a buffer.
scoped_refptr<media::DecoderBufferBase> ShortenBuffer(
scoped_refptr<media::DecoderBufferBase> buffer);
const size_t channel_count_;
double media_clock_rate_ = 1.0;
int64_t input_frames_for_clock_rate_ = 0;
int64_t output_frames_for_clock_rate_ = 0;
} // namespace chromecast