diff options
Diffstat (limited to 'ext/fdkaac/gstfdkaacenc.c')
-rw-r--r-- | ext/fdkaac/gstfdkaacenc.c | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/ext/fdkaac/gstfdkaacenc.c b/ext/fdkaac/gstfdkaacenc.c index 0368d29b6..3405ec185 100644 --- a/ext/fdkaac/gstfdkaacenc.c +++ b/ext/fdkaac/gstfdkaacenc.c @@ -40,7 +40,7 @@ enum PROP_BITRATE }; -#define DEFAULT_BITRATE (128000) +#define DEFAULT_BITRATE (0) #define SAMPLE_RATES " 8000, " \ "11025, " \ @@ -255,6 +255,7 @@ gst_fdkaacenc_set_format (GstAudioEncoder * enc, GstAudioInfo * info) gint mpegversion = 4; CHANNEL_MODE channel_mode; AACENC_InfoStruct enc_info = { 0 }; + gint bitrate; if (self->enc) { /* drain */ @@ -362,9 +363,56 @@ gst_fdkaacenc_set_format (GstAudioEncoder * enc, GstAudioInfo * info) return FALSE; } + bitrate = self->bitrate; + /* See + * http://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_AAC#Recommended_Sampling_Rate_and_Bitrate_Combinations + */ + if (bitrate == 0) { + if (GST_AUDIO_INFO_CHANNELS (info) == 1) { + if (GST_AUDIO_INFO_RATE (info) < 16000) { + bitrate = 8000; + } else if (GST_AUDIO_INFO_RATE (info) == 16000) { + bitrate = 16000; + } else if (GST_AUDIO_INFO_RATE (info) < 32000) { + bitrate = 24000; + } else if (GST_AUDIO_INFO_RATE (info) == 32000) { + bitrate = 32000; + } else if (GST_AUDIO_INFO_RATE (info) <= 44100) { + bitrate = 56000; + } else { + bitrate = 160000; + } + } else if (GST_AUDIO_INFO_CHANNELS (info) == 2) { + if (GST_AUDIO_INFO_RATE (info) < 16000) { + bitrate = 16000; + } else if (GST_AUDIO_INFO_RATE (info) == 16000) { + bitrate = 24000; + } else if (GST_AUDIO_INFO_RATE (info) < 22050) { + bitrate = 32000; + } else if (GST_AUDIO_INFO_RATE (info) < 32000) { + bitrate = 40000; + } else if (GST_AUDIO_INFO_RATE (info) == 32000) { + bitrate = 96000; + } else if (GST_AUDIO_INFO_RATE (info) <= 44100) { + bitrate = 112000; + } else { + bitrate = 320000; + } + } else { + /* 5, 5.1 */ + if (GST_AUDIO_INFO_RATE (info) < 32000) { + bitrate = 160000; + } else if (GST_AUDIO_INFO_RATE (info) <= 44100) { + bitrate = 240000; + } else { + bitrate = 320000; + } + } + } + if ((err = aacEncoder_SetParam (self->enc, AACENC_BITRATE, - self->bitrate)) != AACENC_OK) { - GST_ERROR_OBJECT (self, "Unable to set bitrate %d: %d", self->bitrate, err); + bitrate)) != AACENC_OK) { + GST_ERROR_OBJECT (self, "Unable to set bitrate %d: %d", bitrate, err); return FALSE; } @@ -543,7 +591,8 @@ gst_fdkaacenc_class_init (GstFdkAacEncClass * klass) g_object_class_install_property (object_class, PROP_BITRATE, g_param_spec_int ("bitrate", "Bitrate", - "Target Audio Bitrate", + "Target Audio Bitrate (0 = fixed value based on " + " sample rate and channel count)", 0, G_MAXINT, DEFAULT_BITRATE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |