/*
 *  Copyright (c) 2011 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.
 */

// TODO(tlegrand): Change constant input pointers in all functions to constant
// references, where appropriate.
#include "acm_codec_database.h"

#include <stdio.h>

#include "acm_common_defs.h"
#include "trace.h"

// Includes needed to get version info and to create the codecs.
// G.711, PCM mu-law and A-law.
#include "acm_pcma.h"
#include "acm_pcmu.h"
#include "g711_interface.h"
// CNG.
#include "acm_cng.h"
#include "webrtc_cng.h"
// NetEQ.
#include "webrtc_neteq.h"
#ifdef WEBRTC_CODEC_ISAC
    #include "acm_isac.h"
    #include "acm_isac_macros.h"
    #include "isac.h"
#endif
#ifdef WEBRTC_CODEC_ISACFX
    #include "acm_isac.h"
    #include "acm_isac_macros.h"
    #include "isacfix.h"
#endif
#ifdef WEBRTC_CODEC_PCM16
    #include "pcm16b.h"
    #include "acm_pcm16b.h"
#endif
#ifdef WEBRTC_CODEC_ILBC
    #include "acm_ilbc.h"
    #include "ilbc.h"
#endif
#ifdef WEBRTC_CODEC_AMR
    #include "acm_amr.h"
    #include "amr_interface.h"
#endif
#ifdef WEBRTC_CODEC_AMRWB
    #include "acm_amrwb.h"
    #include "amrwb_interface.h"
#endif
#ifdef WEBRTC_CODEC_G722
    #include "acm_g722.h"
    #include "g722_interface.h"
#endif
#ifdef WEBRTC_CODEC_G722_1
    #include "acm_g7221.h"
    #include "g7221_interface.h"
#endif
#ifdef WEBRTC_CODEC_G722_1C
    #include "acm_g7221c.h"
    #include "g7221c_interface.h"
#endif
#ifdef WEBRTC_CODEC_G729
    #include "acm_g729.h"
    #include "g729_interface.h"
#endif
#ifdef WEBRTC_CODEC_G729_1
    #include "acm_g7291.h"
    #include "g7291_interface.h"
#endif
#ifdef WEBRTC_CODEC_GSMFR
    #include "acm_gsmfr.h"
    #include "gsmfr_interface.h"
#endif
#ifdef WEBRTC_CODEC_SPEEX
    #include "acm_speex.h"
    #include "speex_interface.h"
#endif
#ifdef WEBRTC_CODEC_AVT
    #include "acm_dtmf_playout.h"
#endif
#ifdef WEBRTC_CODEC_RED
    #include "acm_red.h"
#endif

namespace webrtc {

// We dynamically allocate some of the dynamic payload types to the defined
// codecs. Note! There are a limited number of payload types. If more codecs
// are defined they will receive reserved fixed payload types (values 67-95).
const int kDynamicPayloadtypes[ACMCodecDB::kMaxNumCodecs] = {
  105, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
  120, 121, 122, 123, 124, 125, 126,  95,  94,  93,  92,  91,  90,  89,
  88,  87,  86,  85,  84,  83,  82,  81,  80,  79,  78,  77,  76,  75,
  74,  73,  72,  71,  70,  69,  68,  67
};

// Creates database with all supported codec at compile time.
// Each entry needs the following parameters in the given order:
// payload type, name, sampling frequency, packet size in samples,
// default channel support, and default rate.
#if (defined(WEBRTC_CODEC_PCM16) || \
     defined(WEBRTC_CODEC_AMR) || defined(WEBRTC_CODEC_AMRWB) || \
     defined(WEBRTC_CODEC_G729_1) || defined(WEBRTC_CODEC_SPEEX) || \
     defined(WEBRTC_CODEC_G722_1) || defined(WEBRTC_CODEC_G722_1C))
static int count_database = 0;
#endif

const CodecInst ACMCodecDB::database_[] = {
#if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
  {103, "ISAC", 16000, kIsacPacSize480, 1, kIsacWbDefaultRate},
# if (defined(WEBRTC_CODEC_ISAC))
  {104, "ISAC", 32000, kIsacPacSize960, 1, kIsacSwbDefaultRate},
# endif
#endif
#ifdef WEBRTC_CODEC_PCM16
  {kDynamicPayloadtypes[count_database++], "L16", 8000, 80, 1, 128000},
  {kDynamicPayloadtypes[count_database++], "L16", 16000, 160, 1, 256000},
  {kDynamicPayloadtypes[count_database++], "L16", 32000, 320, 1, 512000},
#endif
  // G.711, PCM mu-law and A-law.
  {0, "PCMU", 8000, 160, 1, 64000},
  {8, "PCMA", 8000, 160, 1, 64000},
#ifdef WEBRTC_CODEC_ILBC
  {102, "ILBC", 8000, 240, 1, 13300},
#endif
#ifdef WEBRTC_CODEC_AMR
  {kDynamicPayloadtypes[count_database++], "AMR", 8000, 160, 1, 12200},
#endif
#ifdef WEBRTC_CODEC_AMRWB
  {kDynamicPayloadtypes[count_database++], "AMR-WB", 16000, 320, 1, 20000},
#endif
#ifdef WEBRTC_CODEC_G722
  {9, "G722", 16000, 320, 1, 64000},
#endif
#ifdef WEBRTC_CODEC_G722_1
  {kDynamicPayloadtypes[count_database++], "G7221", 16000, 320, 1, 32000},
  {kDynamicPayloadtypes[count_database++], "G7221", 16000, 320, 1, 24000},
  {kDynamicPayloadtypes[count_database++], "G7221", 16000, 320, 1, 16000},
#endif
#ifdef WEBRTC_CODEC_G722_1C
  {kDynamicPayloadtypes[count_database++], "G7221", 32000, 640, 1, 48000},
  {kDynamicPayloadtypes[count_database++], "G7221", 32000, 640, 1, 32000},
  {kDynamicPayloadtypes[count_database++], "G7221", 32000, 640, 1, 24000},
#endif
#ifdef WEBRTC_CODEC_G729
  {18, "G729", 8000, 240, 1, 8000},
#endif
#ifdef WEBRTC_CODEC_G729_1
  {kDynamicPayloadtypes[count_database++], "G7291", 16000, 320, 1, 32000},
#endif
#ifdef WEBRTC_CODEC_GSMFR
  {3, "GSM", 8000, 160, 1, 13200},
#endif
#ifdef WEBRTC_CODEC_SPEEX
  {kDynamicPayloadtypes[count_database++], "speex", 8000, 160, 1, 11000},
  {kDynamicPayloadtypes[count_database++], "speex", 16000, 320, 1, 22000},
#endif
  // Comfort noise for three different sampling frequencies.
  {13, "CN", 8000, 240, 1, 0},
  {98, "CN", 16000, 480, 1, 0},
  {99, "CN", 32000, 960, 1, 0},
#ifdef WEBRTC_CODEC_AVT
  {106, "telephone-event", 8000, 240, 1, 0},
#endif
#ifdef WEBRTC_CODEC_RED
  {127, "red", 8000, 0, 1, 0},
#endif
  // To prevent compile errors due to trailing commas.
  {-1, "Null", -1, -1, -1, -1}
};

// Create database with all codec settings at compile time.
// Each entry needs the following parameters in the given order:
// Number of allowed packet sizes, a vector with the allowed packet sizes,
// Basic block samples, max number of channels that are supported.
const ACMCodecDB::CodecSettings ACMCodecDB::codec_settings_[] = {
#if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
  {2, {kIsacPacSize480, kIsacPacSize960}, 0, 1},
# if (defined(WEBRTC_CODEC_ISAC))
  {1, {kIsacPacSize960}, 0, 1},
# endif
#endif
#ifdef WEBRTC_CODEC_PCM16
  {4, {80, 160, 240, 320}, 0, 2},
  {4, {160, 320, 480, 640}, 0, 2},
  {2, {320, 640}, 0, 2},
#endif
  // G.711, PCM mu-law and A-law.
  {6, {80, 160, 240, 320, 400, 480}, 0, 2},
  {6, {80, 160, 240, 320, 400, 480}, 0, 2},
#ifdef WEBRTC_CODEC_ILBC
  {4, {160, 240, 320, 480}, 0, 1},
#endif
#ifdef WEBRTC_CODEC_AMR
  {3, {160, 320, 480}, 0, 1},
#endif
#ifdef WEBRTC_CODEC_AMRWB
  {3, {320, 640, 960}, 0, 1},
#endif
#ifdef WEBRTC_CODEC_G722
  {6, {160, 320, 480, 640, 800, 960}, 0, 2},
#endif
#ifdef WEBRTC_CODEC_G722_1
  {1, {320}, 320, 2},
  {1, {320}, 320, 2},
  {1, {320}, 320, 2},
#endif
#ifdef WEBRTC_CODEC_G722_1C
  {1, {640}, 640, 2},
  {1, {640}, 640, 2},
  {1, {640}, 640, 2},
#endif
#ifdef WEBRTC_CODEC_G729
  {6, {80, 160, 240, 320, 400, 480}, 0, 1},
#endif
#ifdef WEBRTC_CODEC_G729_1
  {3, {320, 640, 960}, 0, 1},
#endif
#ifdef WEBRTC_CODEC_GSMFR
  {3, {160, 320, 480}, 160, 1},
#endif
#ifdef WEBRTC_CODEC_SPEEX
  {3, {160, 320, 480}, 0, 1},
  {3, {320, 640, 960}, 0, 1},
#endif
  // Comfort noise for three different sampling frequencies.
  {1, {240}, 240, 1},
  {1, {480}, 480, 1},
  {1, {960}, 960, 1},
#ifdef WEBRTC_CODEC_AVT
  {1, {240}, 240, 1},
#endif
#ifdef WEBRTC_CODEC_RED
  {1, {0}, 0, 1},
#endif
  // To prevent compile errors due to trailing commas.
  {-1, {-1}, -1, -1}
};

// Create a database of all NetEQ decoders at compile time.
const WebRtcNetEQDecoder ACMCodecDB::neteq_decoders_[] = {
#if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
  kDecoderISAC,
# if (defined(WEBRTC_CODEC_ISAC))
  kDecoderISACswb,
# endif
#endif
#ifdef WEBRTC_CODEC_PCM16
  kDecoderPCM16B,
  kDecoderPCM16Bwb,
  kDecoderPCM16Bswb32kHz,
#endif
  // G.711, PCM mu-las and A-law.
  kDecoderPCMu,
  kDecoderPCMa,
#ifdef WEBRTC_CODEC_ILBC
  kDecoderILBC,
#endif
#ifdef WEBRTC_CODEC_AMR
  kDecoderAMR,
#endif
#ifdef WEBRTC_CODEC_AMRWB
  kDecoderAMRWB,
#endif
#ifdef WEBRTC_CODEC_G722
  kDecoderG722,
#endif
#ifdef WEBRTC_CODEC_G722_1
  kDecoderG722_1_32,
  kDecoderG722_1_24,
  kDecoderG722_1_16,
#endif
#ifdef WEBRTC_CODEC_G722_1C
  kDecoderG722_1C_48,
  kDecoderG722_1C_32,
  kDecoderG722_1C_24,
#endif
#ifdef WEBRTC_CODEC_G729
  kDecoderG729,
#endif
#ifdef WEBRTC_CODEC_G729_1
  kDecoderG729_1,
#endif
#ifdef WEBRTC_CODEC_GSMFR
  kDecoderGSMFR,
#endif
#ifdef WEBRTC_CODEC_SPEEX
  kDecoderSPEEX_8,
  kDecoderSPEEX_16,
#endif
  // Comfort noise for three different sampling frequencies.
  kDecoderCNG,
  kDecoderCNG,
  kDecoderCNG,
#ifdef WEBRTC_CODEC_AVT
  kDecoderAVT,
#endif
#ifdef WEBRTC_CODEC_RED
  kDecoderRED,
#endif
  kDecoderReservedEnd
};

// Get codec information from database.
// TODO(tlegrand): replace memcpy with a pointer to the data base memory.
int ACMCodecDB::Codec(int codec_id, CodecInst* codec_inst) {
  // Error check to see that codec_id is not out of bounds.
  if ((codec_id < 0) || (codec_id >= kNumCodecs)) {
    return -1;
  }

  // Copy database information for the codec to the output.
  memcpy(codec_inst, &database_[codec_id], sizeof(CodecInst));

  return 0;
}

// Enumerator for error codes when asking for codec database id.
enum {
  kInvalidCodec = -10,
  kInvalidFrequency = -20,
  kInvalidPayloadtype = -30,
  kInvalidPacketSize = -40,
  kInvalidRate = -50
};

// Gets the codec id number from the database. If there is some mismatch in
// the codec settings, an error message will be recorded in the error string.
// NOTE! Only the first mismatch found will be recorded in the error string.
int ACMCodecDB::CodecNumber(const CodecInst* codec_inst, int* mirror_id,
                            char* err_message, int max_message_len_byte) {
  int codec_id = ACMCodecDB::CodecNumber(codec_inst, mirror_id);

  // Write error message if ACMCodecDB::CodecNumber() returned error.
  if ((codec_id < 0) && (err_message != NULL)) {
    char my_err_msg[1000];

    if (codec_id == kInvalidCodec) {
      sprintf(my_err_msg, "Call to ACMCodecDB::CodecNumber failed, plname=%s "
              "is not a valid codec", codec_inst->plname);
    } else if (codec_id == kInvalidFrequency) {
      sprintf(my_err_msg, "Call to ACMCodecDB::CodecNumber failed, plfreq=%d "
              "is not a valid frequency for the codec %s", codec_inst->plfreq,
              codec_inst->plname);
    } else if (codec_id == kInvalidPayloadtype) {
      sprintf(my_err_msg, "Call to ACMCodecDB::CodecNumber failed, payload "
              "number %d is out of range for %s", codec_inst->pltype,
              codec_inst->plname);
    } else if (codec_id == kInvalidPacketSize) {
      sprintf(my_err_msg, "Call to ACMCodecDB::CodecNumber failed, Packet "
              "size is out of range for %s", codec_inst->plname);
    } else if (codec_id == kInvalidRate) {
      sprintf(my_err_msg, "Call to ACMCodecDB::CodecNumber failed, rate=%d "
              "is not a valid rate for %s", codec_inst->rate,
              codec_inst->plname);
    } else {
      // Other error
      sprintf(my_err_msg, "invalid codec parameters to be registered, "
              "ACMCodecDB::CodecNumber failed");
    }

    strncpy(err_message, my_err_msg, max_message_len_byte - 1);
    // make sure that the message is null-terminated.
    err_message[max_message_len_byte - 1] = '\0';
  }

  return codec_id;
}

// Gets the codec id number from the database. If there is some mismatch in
// the codec settings, the function will return an error code.
// NOTE! The first mismatch found will generate the return value.
int ACMCodecDB::CodecNumber(const CodecInst* codec_inst, int* mirror_id) {
  int codec_number = -1;
  bool name_match = false;

  // Looks for a matching payload name and frequency in the codec list.
  // Need to check both since some codecs have several codec entries with
  // different frequencies (like iSAC).
  for (int i = 0; i < kNumCodecs; i++) {
    if (STR_CASE_CMP(database_[i].plname, codec_inst->plname) == 0) {
      // We have found a matching codec name in the list.
      name_match = true;

      // Checks if frequency match.
      if (codec_inst->plfreq == database_[i].plfreq) {
        codec_number = i;
        break;
      }
    }
  }

  // Checks if the error is in the name or in the frequency.
  if (codec_number == -1) {
    if (!name_match) {
      return kInvalidCodec;
    } else {
      return kInvalidFrequency;
    }
  }

  // Checks the validity of payload type
  if (!ValidPayloadType(codec_inst->pltype)) {
    return kInvalidPayloadtype;
  }

  // Comfort Noise is special case, packet-size & rate is not checked.
  if (STR_CASE_CMP(database_[codec_number].plname, "CN") == 0) {
    *mirror_id = codec_number;
    return codec_number;
  }

  // RED is special case, packet-size & rate is not checked.
  if (STR_CASE_CMP(database_[codec_number].plname, "red") == 0) {
    *mirror_id = codec_number;
    return codec_number;
  }

  // Checks the validity of packet size.
  if (codec_settings_[codec_number].num_packet_sizes > 0) {
    bool packet_size_ok = false;
    int i;
    int packet_size_samples;
    for (i = 0; i < codec_settings_[codec_number].num_packet_sizes; i++) {
      packet_size_samples =
          codec_settings_[codec_number].packet_sizes_samples[i];
      if (codec_inst->pacsize == packet_size_samples) {
        packet_size_ok = true;
        break;
      }
    }

    if (!packet_size_ok) {
      return kInvalidPacketSize;
    }
  }

  if (codec_inst->pacsize < 1) {
    return kInvalidPacketSize;
  }


  // Check the validity of rate. Codecs with multiple rates have their own
  // function for this.
  *mirror_id = codec_number;
  if (STR_CASE_CMP("isac", codec_inst->plname) == 0) {
    if (IsISACRateValid(codec_inst->rate)) {
      // Set mirrorID to iSAC WB which is only created once to be used both for
      // iSAC WB and SWB, because they need to share struct.
      *mirror_id = kISAC;
      return  codec_number;
    } else {
      return kInvalidRate;
    }
  } else if (STR_CASE_CMP("ilbc", codec_inst->plname) == 0) {
    return IsILBCRateValid(codec_inst->rate, codec_inst->pacsize)
        ? codec_number : kInvalidRate;
  } else if (STR_CASE_CMP("amr", codec_inst->plname) == 0) {
    return IsAMRRateValid(codec_inst->rate)
        ? codec_number : kInvalidRate;
  } else if (STR_CASE_CMP("amr-wb", codec_inst->plname) == 0) {
    return IsAMRwbRateValid(codec_inst->rate)
        ? codec_number : kInvalidRate;
  } else if (STR_CASE_CMP("g7291", codec_inst->plname) == 0) {
    return IsG7291RateValid(codec_inst->rate)
        ? codec_number : kInvalidRate;
  } else if (STR_CASE_CMP("speex", codec_inst->plname) == 0) {
    return IsSpeexRateValid(codec_inst->rate)
        ? codec_number : kInvalidRate;
  }

  return IsRateValid(codec_number, codec_inst->rate) ?
      codec_number : kInvalidRate;
}

// Gets codec id number, and mirror id, from database for the receiver.
int ACMCodecDB::ReceiverCodecNumber(const CodecInst* codec_inst,
    int* mirror_id) {
  int codec_number = -1;

  // Looks for a matching payload name and frequency in the codec list.
  // Need to check both since some codecs have several codec entries with
  // different frequencies (like iSAC).
  for (int i = 0; i < kNumCodecs; i++) {
    if (STR_CASE_CMP(database_[i].plname, codec_inst->plname) == 0) {
      // We have found a matching codec name in the list.

      // Check if frequency match.
      if (codec_inst->plfreq == database_[i].plfreq) {
        codec_number = i;
        *mirror_id = codec_number;

        // Check if codec is iSAC, set mirrorID to iSAC WB which is only
        // created once to be used both for iSAC WB and SWB, because they need
        // to share struct.
        if (STR_CASE_CMP(codec_inst->plname, "ISAC") == 0) {
          *mirror_id = kISAC;
        }

        break;
      }
    }
  }

  return codec_number;
}

// Returns the codec sampling frequency for codec with id = "codec_id" in
// database.
int ACMCodecDB::CodecFreq(int codec_id) {
  // Error check to see that codec_id is not out of bounds.
  if (codec_id < 0 || codec_id >= kNumCodecs) {
    return -1;
  }

  return database_[codec_id].plfreq;
}

// Returns the codec's basic coding block size in samples.
int ACMCodecDB::BasicCodingBlock(int codec_id) {
  // Error check to see that codec_id is not out of bounds.
  if (codec_id < 0 || codec_id >= kNumCodecs) {
      return -1;
  }

  return codec_settings_[codec_id].basic_block_samples;
}

// Returns the NetEQ decoder database.
const WebRtcNetEQDecoder* ACMCodecDB::NetEQDecoders() {
  return neteq_decoders_;
}

// All version numbers for the codecs in the database are listed in text.
// TODO(tlegrand): change to use std::string.
int ACMCodecDB::CodecsVersion(char* version, size_t* remaining_buffer_bytes,
                              size_t* position) {
  const size_t kTemporaryBufferSize = 500;
  const size_t kVersionBufferSize = 1000;
  char versions_buffer[kVersionBufferSize];
  char version_num_buf[kTemporaryBufferSize];
  size_t len = *position;
  size_t remaining_size = kVersionBufferSize;

  versions_buffer[0] = '\0';

#if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  ACM_ISAC_VERSION(version_num_buf);
  strncat(versions_buffer, "ISAC\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, "\n", remaining_size);
#endif
#ifdef WEBRTC_CODEC_PCM16
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, "L16\t\t1.0.0\n", remaining_size);
#endif
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG711_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.711\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, "\n", remaining_size);
#ifdef WEBRTC_CODEC_ILBC
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcIlbcfix_version(version_num_buf);
  strncat(versions_buffer, "ILBC\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, "\n", remaining_size);
#endif
#ifdef WEBRTC_CODEC_AMR
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcAmr_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "AMR\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_AMRWB
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcAmrWb_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "AMR-WB\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_G722
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG722_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.722\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_G722_1
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG7221_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.722.1\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_G722_1C
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG7221c_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.722.1C\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_G729
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG729_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.729\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_G729_1
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcG7291_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "G.729.1\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_GSMFR
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcGSMFR_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "GSM-FR\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
#ifdef WEBRTC_CODEC_SPEEX
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcSpeex_Version(version_num_buf, kTemporaryBufferSize);
  strncat(versions_buffer, "Speex\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#endif
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  WebRtcCng_Version(version_num_buf);
  strncat(versions_buffer, "CNG\t\t", remaining_size);
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, version_num_buf, remaining_size);
#ifdef WEBRTC_CODEC_AVT
  remaining_size = kVersionBufferSize - strlen(versions_buffer);
  strncat(versions_buffer, "Tone Generation\t1.0.0\n", remaining_size);
#endif
  strncpy(&version[len], versions_buffer, *remaining_buffer_bytes);
  *position = strlen(version);
  *remaining_buffer_bytes -= (*position - len);
  if (*remaining_buffer_bytes < strlen(versions_buffer)) {
    return -1;
  }

  return 0;
}

// Gets mirror id. The Id is used for codecs sharing struct for settings that
// need different payload types.
int ACMCodecDB::MirrorID(int codec_id) {
  if (STR_CASE_CMP(database_[codec_id].plname, "isac") == 0) {
    return kISAC;
  } else {
    return codec_id;
  }
}

// Creates memory/instance for storing codec state.
ACMGenericCodec* ACMCodecDB::CreateCodecInstance(const CodecInst* codec_inst) {
  // All we have support for right now.
  if (!STR_CASE_CMP(codec_inst->plname, "ISAC")) {
#if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
    return new ACMISAC(kISAC);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "PCMU")) {
    return new ACMPCMU(kPCMU);
  } else if (!STR_CASE_CMP(codec_inst->plname, "PCMA")) {
    return new ACMPCMA(kPCMA);
  } else if (!STR_CASE_CMP(codec_inst->plname, "ILBC")) {
#ifdef WEBRTC_CODEC_ILBC
    return new ACMILBC(kILBC);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "AMR")) {
#ifdef WEBRTC_CODEC_AMR
    return new ACMAMR(kGSMAMR);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "AMR-WB")) {
#ifdef WEBRTC_CODEC_AMRWB
    return new ACMAMRwb(kGSMAMRWB);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "G722")) {
#ifdef WEBRTC_CODEC_G722
    return new ACMG722(kG722);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "G7221")) {
    switch (codec_inst->plfreq) {
      case 16000: {
#ifdef WEBRTC_CODEC_G722_1
        int codec_id;
        switch (codec_inst->rate) {
          case 16000 : {
            codec_id = kG722_1_16;
            break;
          }
          case 24000 : {
            codec_id = kG722_1_24;
            break;
          }
          case 32000 : {
            codec_id = kG722_1_32;
            break;
          }
          default: {
            return NULL;
          }
          return new ACMG722_1(codec_id);
        }
#endif
      }
      case 32000: {
#ifdef WEBRTC_CODEC_G722_1C
        int codec_id;
        switch (codec_inst->rate) {
          case 24000 : {
            codec_id = kG722_1C_24;
            break;
          }
          case 32000 : {
            codec_id = kG722_1C_32;
            break;
          }
          case 48000 : {
            codec_id = kG722_1C_48;
            break;
          }
          default: {
            return NULL;
          }
          return new ACMG722_1C(codec_id);
        }
#endif
      }
    }
  } else if (!STR_CASE_CMP(codec_inst->plname, "CN")) {
    // For CN we need to check sampling frequency to know what codec to create.
    int codec_id;
    switch (codec_inst->plfreq) {
      case 8000: {
        codec_id = kCNNB;
        break;
      }
      case 16000: {
        codec_id = kCNWB;
        break;
      }
      case 32000: {
        codec_id = kCNSWB;
        break;
      }
      default: {
        return NULL;
      }
    }
    return new ACMCNG(codec_id);
  } else if (!STR_CASE_CMP(codec_inst->plname, "G729")) {
#ifdef WEBRTC_CODEC_G729
    return new ACMG729(kG729);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "G7291")) {
#ifdef WEBRTC_CODEC_G729_1
    return new ACMG729_1(kG729_1);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "speex")) {
#ifdef WEBRTC_CODEC_SPEEX
    int codec_id;
    switch (codec_inst->plfreq) {
      case 8000: {
        codec_id = kSPEEX8;
        break;
      }
      case 16000: {
        codec_id = kSPEEX16;
        break;
      }
      default: {
        return NULL;
      }
    }
    return new ACMSPEEX(codec_id);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "CN")) {
    // For CN we need to check sampling frequency to know what codec to create.
    int codec_id;
    switch (codec_inst->plfreq) {
      case 8000: {
        codec_id = kCNNB;
        break;
      }
      case 16000: {
        codec_id = kCNWB;
        break;
      }
      case 32000: {
        codec_id = kCNSWB;
        break;
      }
      default: {
        return NULL;
      }
    }
    return new ACMCNG(codec_id);
  } else if (!STR_CASE_CMP(codec_inst->plname, "L16")) {
#ifdef WEBRTC_CODEC_PCM16
    // For L16 we need to check sampling frequency to know what codec to create.
    int codec_id;
    switch (codec_inst->plfreq) {
      case 8000: {
        codec_id = kPCM16B;
        break;
      }
      case 16000: {
        codec_id =kPCM16Bwb;
        break;
      }
      case 32000: {
        codec_id = kPCM16Bswb32kHz;
        break;
      }
      default: {
        return NULL;
      }
    }
    return new ACMPCM16B(codec_id);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "telephone-event")) {
#ifdef WEBRTC_CODEC_AVT
    return new ACMDTMFPlayout(kAVT);
#endif
  } else if (!STR_CASE_CMP(codec_inst->plname, "red")) {
#ifdef WEBRTC_CODEC_RED
    return new ACMRED(kRED);
#endif
  }
  return NULL;
}

// Checks if the bitrate is valid for the codec.
bool ACMCodecDB::IsRateValid(int codec_id, int rate) {
  if (database_[codec_id].rate == rate) {
    return true;
  } else {
    return false;
  }
}

// Checks if the bitrate is valid for iSAC.
bool ACMCodecDB::IsISACRateValid(int rate) {
  if ((rate == -1) || ((rate <= 56000) && (rate >= 10000))) {
    return true;
  } else {
    return false;
  }
}

// Checks if the bitrate is valid for iLBC.
bool ACMCodecDB::IsILBCRateValid(int rate, int frame_size_samples) {
  if (((frame_size_samples == 240) || (frame_size_samples == 480)) &&
      (rate == 13300)) {
    return true;
  } else if (((frame_size_samples == 160) || (frame_size_samples == 320)) &&
      (rate == 15200)) {
    return true;
  } else {
    return false;
  }
}

// Check if the bitrate is valid for the GSM-AMR.
bool ACMCodecDB::IsAMRRateValid(int rate) {
  switch (rate) {
    case 4750:
    case 5150:
    case 5900:
    case 6700:
    case 7400:
    case 7950:
    case 10200:
    case 12200: {
      return true;
    }
    default: {
      return false;
    }
  }
}

// Check if the bitrate is valid for GSM-AMR-WB.
bool ACMCodecDB::IsAMRwbRateValid(int rate) {
  switch (rate) {
    case 7000:
    case 9000:
    case 12000:
    case 14000:
    case 16000:
    case 18000:
    case 20000:
    case 23000:
    case 24000: {
      return true;
    }
    default: {
      return false;
    }
  }
}

// Check if the bitrate is valid for G.729.1.
bool ACMCodecDB::IsG7291RateValid(int rate) {
  switch (rate) {
    case 8000:
    case 12000:
    case 14000:
    case 16000:
    case 18000:
    case 20000:
    case 22000:
    case 24000:
    case 26000:
    case 28000:
    case 30000:
    case 32000: {
      return true;
    }
    default: {
      return false;
    }
  }
}
// Checks if the bitrate is valid for Speex.
bool ACMCodecDB::IsSpeexRateValid(int rate) {
  if (rate > 2000) {
    return true;
  } else {
    return false;
  }
}

// Checks if the payload type is in the valid range.
bool ACMCodecDB::ValidPayloadType(int payload_type) {
  if ((payload_type < 0) || (payload_type > 127)) {
    return false;
  }
  return true;
}

}  // namespace webrtc