blob: 5c158798aa2eb3ce9a5f6409d9db9bb9515c1e0c [file] [log] [blame]
// Copyright (c) 2012 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 <string>
#include <vector>
#include "base/basictypes.h"
#include "base/time/time.h"
#include "cobalt/media/base/audio_codecs.h"
#include "cobalt/media/base/channel_layout.h"
#include "cobalt/media/base/encryption_scheme.h"
#include "cobalt/media/base/media_export.h"
#include "cobalt/media/base/sample_format.h"
#include "starboard/types.h"
namespace cobalt {
namespace media {
// TODO(dalecurtis): FFmpeg API uses |bytes_per_channel| instead of
// |bits_per_channel|, we should switch over since bits are generally confusing
// to work with.
class MEDIA_EXPORT AudioDecoderConfig {
// Constructs an uninitialized object. Clients should call Initialize() with
// appropriate values before using.
// Constructs an initialized object.
AudioDecoderConfig(AudioCodec codec, SampleFormat sample_format,
ChannelLayout channel_layout, int samples_per_second,
const std::vector<uint8_t>& extra_data,
const EncryptionScheme& encryption_scheme);
// Resets the internal state of this object. |codec_delay| is in frames.
void Initialize(AudioCodec codec, SampleFormat sample_format,
ChannelLayout channel_layout, int samples_per_second,
const std::vector<uint8_t>& extra_data,
const EncryptionScheme& encryption_scheme,
base::TimeDelta seek_preroll, int codec_delay);
// Returns true if this object has appropriate configuration values, false
// otherwise.
bool IsValidConfig() const;
// Returns true if all fields in |config| match this config.
// Note: The contents of |extra_data_| are compared not the raw pointers.
bool Matches(const AudioDecoderConfig& config) const;
// Returns a human-readable string describing |*this|. For debugging & test
// output only.
std::string AsHumanReadableString() const;
AudioCodec codec() const { return codec_; }
int bits_per_channel() const { return bytes_per_channel_ * 8; }
int bytes_per_channel() const { return bytes_per_channel_; }
ChannelLayout channel_layout() const { return channel_layout_; }
int samples_per_second() const { return samples_per_second_; }
SampleFormat sample_format() const { return sample_format_; }
int bytes_per_frame() const { return bytes_per_frame_; }
base::TimeDelta seek_preroll() const { return seek_preroll_; }
int codec_delay() const { return codec_delay_; }
// Optional byte data required to initialize audio decoders such as Vorbis
// codebooks.
const std::vector<uint8_t>& extra_data() const { return extra_data_; }
// Whether the audio stream is potentially encrypted.
// Note that in a potentially encrypted audio stream, individual buffers
// can be encrypted or not encrypted.
bool is_encrypted() const { return encryption_scheme_.is_encrypted(); }
// Encryption scheme used for encrypted buffers.
const EncryptionScheme& encryption_scheme() const {
return encryption_scheme_;
void set_mime(const std::string& mime) { mime_ = mime; }
const std::string& mime() const { return mime_; }
AudioCodec codec_;
SampleFormat sample_format_;
int bytes_per_channel_;
ChannelLayout channel_layout_;
int samples_per_second_;
int bytes_per_frame_;
std::vector<uint8_t> extra_data_;
EncryptionScheme encryption_scheme_;
// |seek_preroll_| is the duration of the data that the decoder must decode
// before the decoded data is valid.
base::TimeDelta seek_preroll_;
// |codec_delay_| is the number of frames the decoder should discard before
// returning decoded data. This value can include both decoder delay as well
// as padding added during encoding.
int codec_delay_;
// |mime_| contains the mime type string specified when creating the stream.
// For example, when the stream is created via MediaSource, it is the mime
// string passed to addSourceBuffer(). It can be an empty string when the
// appropriate mime string is unknown. It is provided as an extra information
// and can be inconsistent with the other member variables.
std::string mime_;
// Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler
// generated copy constructor and assignment operator. Since the extra data is
// typically small, the performance impact is minimal.
} // namespace media
} // namespace cobalt