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LAME is a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL. Latest LAME release: v3.100 (October 2017) LAME development started around mid-1998. Mike Cheng started it as a patch against the 8hz-MP3 encoder sources. After some quality concerns raised by others, he decided to start from scratch based on the dist10 sources.
The Microsoft Media Foundation MP3 audio encoder is a Media Foundation Transform (MFT) that encodes MPEG-1 layer 3 (MP3) audio.
Class Identifier
The class identifier (CLSID) of the MP3 encoder is CLSID_MP3ACMCodecWrapper, defined in the header file wmcodecdsp.h.
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Media Types
The MP3 encoder supports the following media types. The output type must be set before the input type.
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Output Types
Set the following attributes on the output media type.
| Attribute | Description | Remarks |
|---|---|---|
| MF_MT_MAJOR_TYPE | Major type. | Must be MFMediaType_Audio. |
| MF_MT_SUBTYPE | Audio subtype. | Must be MFAudioFormat_MP3. |
| MF_MT_AUDIO_AVG_BYTES_PER_SECOND | Bit rate of the encoded MP3 stream, in bytes per second. | The encoder supports all bit rates defined by the standard (32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, or 320 Kbps). The default bit rates are 128 Kbps for mono and 320 Kbps for stereo. Use this attribute to specify the encoded bit rate. |
| MF_MT_AUDIO_NUM_CHANNELS | Number of channels. | The following values are supported:
|
| MF_MT_AUDIO_SAMPLES_PER_SECOND | Samples per second. | The following values are supported:
|
| MF_MT_USER_DATA | Additional codec data. | This attribute contains the 12 bytes of the MPEGLAYER3WAVEFORMAT structure that follow the wfx member of that structure. |
Alternatively, you can fill in an MPEGLAYER3WAVEFORMAT structure and call MFInitMediaTypeFromWaveFormatEx to convert the structure to a Media Foundation media type.
Input Types
Set the following attributes on the input media type.
| Attribute | Description | Remarks |
|---|---|---|
| MF_MT_MAJOR_TYPE | Major type. | Must be MFMediaType_Audio. |
| MF_MT_SUBTYPE | Subtype. | Must be MFAudioFormat_PCM. |
| MF_MT_AUDIO_BITS_PER_SAMPLE | Bits per sample. | Must be 16. |
| MF_MT_AUDIO_SAMPLES_PER_SECOND | Samples per second. | Must match the output type. |
| MF_MT_AUDIO_NUM_CHANNELS | Number of channels. | Must match the output type. |
The encoder supports only 16-bit integer PCM input. It does not support 32-bit floating point input.
Media Formats
The MPEG-1 and MPEG-2 standard defines 252 layer 3 audio formats. The MP3 encoder supports the standard with some exceptions, as well as some additional formats, as described below. Layer 3 is defined as:
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| Channels | mono or stereo |
| MPEG-1 sample rates in kHz | 44.1, 48, 32 |
| MPEG-1 encoded bit rates in kbps | 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 |
| MPEG-2 sample rates in kHz | 8, 11.025, 12, 16, 22.05, 24 |
| MPEG-2 encoded bit rates in kbps | 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 144, 160 |
The MP3 encoder also supports the following formats.
| Sample Rate | Bit Rate | Channel Number |
|---|---|---|
| 8000 | 18000, 20000 | 2 |
| 11025 | 18000, 20000 | 1 or 2 |
| 12000 | 18000, 20000 | 1 or 2 |
| 16000 | 18000, 20000 | 1 |
| 32000 | 144000 | 1 or 2 |
| 44100 | 144000 | 1 or 2 |
| 48000 | 144000 | 1 or 2 |
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The MP3 encoder does not support the following formats defined by the standard.
| Sample Rate | Bit Rates | Channel Number |
|---|---|---|
| 12000 | 80000, 96000, 112000, 128000, 144000, 160000 | 1 or 2 |
| 11025 | 80000, 96000, 112000, 128000, 144000, 160000 | 1 or 2 |
| 8000 | 80000, 96000, 112000, 128000, 144000, 160000 | 1 or 2 |
| 8000 | 8000, 11025, 12000, 16000, 22050, 24000 | 2 |
Requirements
| Minimum supported client | Windows 8 [desktop apps only] |
| Minimum supported server | Windows Server 2012 [desktop apps only] |
See also
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Easy and Perfect!
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Does exactly what I was looking for.
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