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Custom Index Metadata
| # OMX.broadcom.audio_encode
160
| audio_encode |
161
This conformant component accepts raw PCM audio samples, and can encode them using a number of formats to produce compressed audio frames. This component will buffer a small number of PCM samples to allow re-packetisation depending on the frame size of the encoded format. It also buffers encoded frames to allow for latency in the multiplexer file writing.
Port | Index | Notes
160 | `OMX_IndexParamPortDefinition` | Query / set the port parameter. Must be set to PCM audio.
`OMX_IndexParamAudioPcm` | Query / set the port PCM format for the input port. `nChannels` must be 1, 2, 4, or 8. 5.1 audio can be carried inside 8 channels, with the last two channels advertise as blank. `nBitPerSample` must be 16 or 32. `eNumData` must be `OMX_NumericalDataSigned`. `eEndian` must be `OMX_EndianLittle`. `bInterleaved` must be `OMX_TRUE`. `ePCMMode` must be `OMX_AUDIO_PCMModeLinear`.
161 | `OMX_IndexParamPortDefinition` | Query / set the port parameter. The encoder to be used is specified by setting the `format.audio.eEncoding` field. When encoding starts, if the maximum size of encoded frame is larger than the `nBufferSize` value then the `nBufferSize` is increased to this value and an `OMX_EventPortSettingsChanged` event is signalled.
`OMX_IndexParamAudioMp3` | Query / set the MP3 parameters for the encoded bitstream. Only the `nBitRate` and `nChannels` (must be 1 or 2) fields are considered; other parameters are copied through from the PCM input port.
`OMX_IndexParamAudioAac` | Query / set the AAC parameters for the encoded bitstream. The fields `nBitRate`, `eAACStreamFormat`, `nSampleRate` and `nChannels` (must be 1 or 2) are respected; other parameters are copied through from the PCM input port. Stream formats supported are the default value of `MP2ADTS`, and `RAW`.
`OMX_IndexParamAudioAmr` | Query / set the AMR parameters for the encoded bitstream. The field `nChannels` must be 1 (mono).
`OMX_IndexParamCodecConfig` | Query for codec-specific information.
`OMX_IndexParamBrcmDataUnit` | Query the type of data delivery for the encoded data. This port emits `OMX_DataUnitCodedPicture` format data.
160 161 | `OMX_IndexParamAudioPortFormat` | Query / set the audio port format used on this port. The input port supports PCM only, the output port supports a number of encoded audio formats.
`OMX_IndexParamILFifoConfig` | Set the internal fifo size for both input and output ports. The input port fifo is used to buffer enough PCM audio samples for the encoder to consume a whole frame. The output fifo needs to buffer enough encoded frames to cope with variations of writing speed through the filesystem. Both input and output fifos will default to a sensible size if this index is not set, the primary use for this index is in testing.