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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* This file generates databases with information about all supported audio
* codecs.
*/
#ifndef WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_CODEC_DATABASE_H_
#define WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_CODEC_DATABASE_H_
#include "webrtc/common_types.h"
#include "webrtc/engine_configurations.h"
#include "webrtc/modules/audio_coding/main/acm2/rent_a_codec.h"
#include "webrtc/modules/audio_coding/neteq/include/neteq.h"
namespace webrtc {
namespace acm2 {
// TODO(tlegrand): replace class ACMCodecDB with a namespace.
class ACMCodecDB {
public:
// kMaxNumCodecs - Maximum number of codecs that can be activated in one
// build.
// kMaxNumPacketSize - Maximum number of allowed packet sizes for one codec.
// These might need to be increased if adding a new codec to the database
static const int kMaxNumCodecs = 50;
static const int kMaxNumPacketSize = 6;
// Codec specific settings
//
// num_packet_sizes - number of allowed packet sizes.
// packet_sizes_samples - list of the allowed packet sizes.
// basic_block_samples - assigned a value different from 0 if the codec
// requires to be fed with a specific number of samples
// that can be different from packet size.
// channel_support - number of channels supported to encode;
// 1 = mono, 2 = stereo, etc.
struct CodecSettings {
int num_packet_sizes;
int packet_sizes_samples[kMaxNumPacketSize];
int basic_block_samples;
int channel_support;
};
// Gets codec information from database at the position in database given by
// [codec_id].
// Input:
// [codec_id] - number that specifies at what position in the database to
// get the information.
// Output:
// [codec_inst] - filled with information about the codec.
// Return:
// 0 if successful, otherwise -1.
static int Codec(int codec_id, CodecInst* codec_inst);
// Returns codec id from database, given the information received in the input
// [codec_inst].
// Input:
// [codec_inst] - Information about the codec for which we require the
// database id.
// Return:
// codec id if successful, otherwise < 0.
static int CodecNumber(const CodecInst& codec_inst);
static int CodecId(const CodecInst& codec_inst);
static int CodecId(const char* payload_name, int frequency, int channels);
static int ReceiverCodecNumber(const CodecInst& codec_inst);
// Returns the codec sampling frequency for codec with id = "codec_id" in
// database.
// TODO(tlegrand): Check if function is needed, or if we can change
// to access database directly.
// Input:
// [codec_id] - number that specifies at what position in the database to
// get the information.
// Return:
// codec sampling frequency if successful, otherwise -1.
static int CodecFreq(int codec_id);
// Check if the payload type is valid, meaning that it is in the valid range
// of 0 to 127.
// Input:
// [payload_type] - payload type.
static bool ValidPayloadType(int payload_type);
// Databases with information about the supported codecs
// database_ - stored information about all codecs: payload type, name,
// sampling frequency, packet size in samples, default channel
// support, and default rate.
// codec_settings_ - stored codec settings: number of allowed packet sizes,
// a vector with the allowed packet sizes, basic block
// samples, and max number of channels that are supported.
// neteq_decoders_ - list of supported decoders in NetEQ.
static const CodecInst database_[kMaxNumCodecs];
static const CodecSettings codec_settings_[kMaxNumCodecs];
private:
static const NetEqDecoder neteq_decoders_[kMaxNumCodecs];
friend class RentACodec;
};
} // namespace acm2
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_CODEC_DATABASE_H_
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