Google Flix Engine Linux Reference Manual - Manual (Page 36)

30 Flix Engine Linux Module Documentation
5.9 AMR_NB - FFmpeg
5.9.1 Detailed Description
AMR narrowband encoder.
Valid bitrates:
AMR narrowband only supports a fixed set of bitrates:
codec mode | kbps
===================
MR475 | 4.75
MR515 | 5.15
MR59 | 5.90
MR67 | 6.70
MR74 | 7.40
MR795 | 7.95
MR102 | 10.2
MR122 | 12.2
FE2_AMR_BITRATE will be adjusted as follows, if necessary:
FE2_AMR_BITRATE = 0.0 <= FE2_AMR_BITRATE < 5.0, MR475
5.0 <= FE2_AMR_BITRATE < 5.9, MR515
5.9 <= FE2_AMR_BITRATE < 6.7, MR59
6.7 <= FE2_AMR_BITRATE <= 7.0, MR67
7.0 < FE2_AMR_BITRATE < 7.95, MR74
7.95 <= FE2_AMR_BITRATE < 10.0, MR795
10.0 <= FE2_AMR_BITRATE < 12.0, MR102
12.0 <= FE2_AMR_BITRATE, MR122
Attention:
In addition to the bitrate restrictions above, the sample rate MUST be 8000Hz and the number of
channels MUST be 1.
See also:
Resample
Example Usage:
sc = Flix2_AddCodec(&codec, flix, FE2_CODEC_AMR_NB);
// Use 12.2kbps
if(sc == ON2_OK)
sc = Flix2_CodecSetParam(codec, FE2_AMR_BITRATE, 12.2);
Additional References:
• 3GPP homepage
• AMR-NB Specification detail
• FFmpeg project homepage
Defines
• #define FE2_CODEC_AMR_NB
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