RentACodec: New class that takes over part of ACMCodecDB's job

webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc
index 8a0980e6190f3d6526a594a83c6d465937ee14a3..7754a9c375b772b0513ef537994d72a448e3e533 100644
--- a/webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc
@@ -12,8 +12,8 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
-#include "webrtc/modules/audio_coding/main/acm2/acm_codec_database.h"
 #include "webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h"
+#include "webrtc/modules/audio_coding/main/acm2/rent_a_codec.h"
 #include "webrtc/system_wrappers/interface/clock.h"
 #include "webrtc/system_wrappers/interface/trace.h"
 
@@ -38,29 +38,32 @@ AudioCodingModule* AudioCodingModule::Create(const Config& config) {
   return new acm2::AudioCodingModuleImpl(config);
 }
 
-// Get number of supported codecs
 int AudioCodingModule::NumberOfCodecs() {
-  return acm2::ACMCodecDB::kNumCodecs;
+  return static_cast<int>(acm2::RentACodec::NumberOfCodecs());
 }
 
-// Get supported codec parameters with id
 int AudioCodingModule::Codec(int list_id, CodecInst* codec) {
-  // Get the codec settings for the codec with the given list ID
-  return acm2::ACMCodecDB::Codec(list_id, codec);
+  auto codec_id = acm2::RentACodec::CodecIdFromIndex(list_id);
+  if (!codec_id)
+    return -1;
+  auto ci = acm2::RentACodec::CodecInstById(*codec_id);
+  if (!ci)
+    return -1;
+  *codec = *ci;
+  return 0;
 }
 
-// Get supported codec parameters with name, frequency and number of channels.
 int AudioCodingModule::Codec(const char* payload_name,
                              CodecInst* codec,
                              int sampling_freq_hz,
                              int channels) {
-  int codec_id;
-
-  // Get the id of the codec from the database.
-  codec_id = acm2::ACMCodecDB::CodecId(
+  rtc::Maybe<CodecInst> ci = acm2::RentACodec::CodecInstByParams(
       payload_name, sampling_freq_hz, channels);
-  if (codec_id < 0) {
-    // We couldn't find a matching codec, set the parameters to unacceptable
+  if (ci) {
+    *codec = *ci;
+    return 0;
+  } else {
+    // We couldn't find a matching codec, so set the parameters to unacceptable
     // values and return.
     codec->plname[0] = '\0';
     codec->pltype = -1;
@@ -69,35 +72,26 @@ int AudioCodingModule::Codec(const char* payload_name,
     codec->plfreq = 0;
     return -1;
   }
-
-  // Get default codec settings.
-  acm2::ACMCodecDB::Codec(codec_id, codec);
-
-  // Keep the number of channels from the function call. For most codecs it
-  // will be the same value as in default codec settings, but not for all.
-  codec->channels = channels;
-
-  return 0;
 }
 
-// Get supported codec Index with name, frequency and number of channels.
 int AudioCodingModule::Codec(const char* payload_name,
                              int sampling_freq_hz,
                              int channels) {
-  return acm2::ACMCodecDB::CodecId(payload_name, sampling_freq_hz, channels);
+  rtc::Maybe<acm2::RentACodec::CodecId> ci = acm2::RentACodec::CodecIdByParams(
+      payload_name, sampling_freq_hz, channels);
+  if (!ci)
+    return -1;
+  rtc::Maybe<int> i = acm2::RentACodec::CodecIndexFromId(*ci);
+  return i ? *i : -1;
 }
 
 // Checks the validity of the parameters of the given codec
 bool AudioCodingModule::IsCodecValid(const CodecInst& codec) {
-  int codec_number = acm2::ACMCodecDB::CodecNumber(codec);
-
-  if (codec_number < 0) {
+  bool valid = acm2::RentACodec::IsCodecValid(codec);
+  if (!valid)
     WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, -1,
                  "Invalid codec setting");
-    return false;
-  } else {
-    return true;
-  }
+  return valid;
 }
 
 }  // namespace webrtc