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kernel: Revert net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends See: https://github.com/raspberrypi/linux/pull/2717 kernel: thermal: add hysteresis support and adjust PoE HAT trip points See: https://github.com/raspberrypi/linux/pull/2700 kernel: Add composite RPi driver for pcm512x DAC HAT cards See: https://github.com/raspberrypi/linux/pull/2702 firmware: jpeg/mjpeg: MJPEG doesn't insert JFIF APP0 header See: https://github.com/raspberrypi/userland/issues/345 firmware: Add IL HVS component firmware: mmal: Acquire zero copy buffers on being passed to the VPU firmware: video_render: Use per pixel alpha on RGBA and BGRA firmware: video_render: Add support for alpha options (MIX and PREMULT)
120 lines
5.6 KiB
HTML
120 lines
5.6 KiB
HTML
<html>
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<head>
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<title>audio_encode</title>
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<body>
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<table border="0" cellpadding="10"><tr valign="top"><td>
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<table border="0" cellspacing="0" cellpadding="1"><tr>
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<td bgcolor="#e0c0c0"><a href="index.html">Top</a><br>
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<tr><td bgcolor="#c0e0e0">
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<a href="audio_capture.html">audio_capture</a><br>
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<a href="audio_decode.html">audio_decode</a><br>
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<a href="audio_encode.html">audio_encode</a><br>
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<a href="audio_lowpower.html">audio_lowpower</a><br>
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<a href="audio_mixer.html">audio_mixer</a><br>
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<a href="audio_processor.html">audio_processor</a><br>
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<a href="audio_render.html">audio_render</a><br>
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<a href="audio_splitter.html">audio_splitter</a><br>
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<tr><td bgcolor="#e0c0c0">
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<a href="image_decode.html">image_decode</a><br>
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<a href="image_encode.html">image_encode</a><br>
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<a href="image_fx.html">image_fx</a><br>
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<a href="resize.html">resize</a><br>
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<a href="source.html">source</a><br>
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<a href="rawcam.html">rawcam</a><br>
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<a href="video_decode.html">video_decode</a><br>
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<a href="video_encode.html">video_encode</a><br>
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<a href="video_render.html">video_render</a><br>
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<a href="video_scheduler.html">video_scheduler</a><br>
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<a href="video_splitter.html">video_splitter</a><br>
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<tr><td bgcolor="#c0e0e0">
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<a href="prop.html">Custom Index</a><br>
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<a href="metadata.html">Metadata</a><br>
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</table><td>
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<h1>OMX.broadcom.audio_encode</h1>
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<table cellspacing="0" cellpadding="2"><tr>
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<td cellpadding="0">
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<table border="0" cellborder="1" cellspacing="0">
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<tr><td border="1" port="160" bgcolor="green">160</td></tr>
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</table></td>
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<td bgcolor="grey" border="1">audio_encode</td> <td cellpadding="0">
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<table border="0" cellborder="1" cellspacing="0">
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<tr><td border="1" port="161" bgcolor="green">161</td></tr>
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</table></td>
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</tr></table><p>
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<p>
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This conformant component accepts raw PCM audio samples, and can
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encode them using a number of formats to produce compressed audio
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frames. This component will buffer a small number of PCM samples to
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allow re-packetisation depending on the frame size of the encoded
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format. It also buffers encoded frames to allow for latency in the
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multiplexer file writing.
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<p>
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<p>
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<table border="1" cellspacing="0" cellpadding="2"><tr><td>Port<td>Index<td>Notes
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<tr valign="top"><td rowspan="2">160<td><tt>OMX_IndexParamPortDefinition</tt>
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<td> Query / set the port parameter. Must be set to PCM audio.
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<tr valign="top"><td><tt>OMX_IndexParamAudioPcm</tt>
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<td> Query / set the port PCM format for the input port.
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<tt>nChannels</tt> must be 1, 2, 4, or 8. 5.1 audio can be carried
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inside 8 channels, with the last two channels advertise as blank.
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<tt>nBitPerSample</tt> must be 16 or 32.
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<tt>eNumData</tt> must be <tt>OMX_NumericalDataSigned</tt>.
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<tt>eEndian</tt> must be <tt>OMX_EndianLittle</tt>.
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<tt>bInterleaved</tt> must be <tt>OMX_TRUE</tt>.
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<tt>ePCMMode</tt> must be <tt>OMX_AUDIO_PCMModeLinear</tt>.
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<tr valign="top"><td rowspan="6">161<td><tt>OMX_IndexParamPortDefinition</tt>
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<td> Query / set the port parameter. The encoder to be used is specified by
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setting the <tt>format.audio.eEncoding</tt> field. When encoding
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starts, if the maximum size of encoded frame is larger than the
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<tt>nBufferSize</tt> value then the <tt>nBufferSize</tt> is increased to
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this value and an <tt>OMX_EventPortSettingsChanged</tt> event is
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signalled.
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<tr valign="top"><td><tt>OMX_IndexParamAudioMp3</tt>
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<td> Query / set the MP3 parameters for the encoded bitstream. Only the
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<tt>nBitRate</tt> and <tt>nChannels</tt> (must be 1 or 2) fields are
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considered; other parameters are copied through from the PCM input
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port.
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<tr valign="top"><td><tt>OMX_IndexParamAudioAac</tt>
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<td> Query / set the AAC parameters for the encoded bitstream. The fields
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<tt>nBitRate</tt>, <tt>eAACStreamFormat</tt>, <tt>nSampleRate</tt> and
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<tt>nChannels</tt> (must be 1 or 2) are respected; other parameters
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are copied through from the PCM input port. Stream formats supported
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are the default value of <tt>MP2ADTS</tt>, and <tt>RAW</tt>.
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<tr valign="top"><td><tt>OMX_IndexParamAudioAmr</tt>
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<td> Query / set the AMR parameters for the encoded bitstream.
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The field <tt>nChannels</tt> must be 1 (mono).
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<tr valign="top"><td><tt><a href="prop.html#OMX_IndexParamCodecConfig">OMX_IndexParamCodecConfig</a></tt>
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<td> Query for codec-specific information.
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<tr valign="top"><td><tt><a href="prop.html#OMX_IndexParamBrcmDataUnit">OMX_IndexParamBrcmDataUnit</a></tt>
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<td> Query the type of data delivery for the encoded data. This port emits
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<tt>OMX_DataUnitCodedPicture</tt> format data.
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<tr valign="top"><td rowspan="2">160 161<td><tt>OMX_IndexParamAudioPortFormat</tt>
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<td> Query / set the audio port format used on this port. The input port
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supports PCM only, the output port supports a number of encoded audio
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formats.
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<tr valign="top"><td><tt><a href="prop.html#OMX_IndexParamILFifoConfig">OMX_IndexParamILFifoConfig</a></tt>
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<td> Set the internal fifo size for both input and output ports. The input
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port fifo is used to buffer enough PCM audio samples for the encoder
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to consume a whole frame. The output fifo needs to buffer enough
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encoded frames to cope with variations of writing speed through the
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filesystem. Both input and output fifos will default to a sensible
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size if this index is not set, the primary use for this index is in
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testing.
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</table>
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</table>
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</body>
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</html>
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