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Diffstat (limited to 'ext/fdkaac/gstfdkaacenc.c')
-rw-r--r--ext/fdkaac/gstfdkaacenc.c57
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));