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Metadata

OMX.broadcom.read_media

113
read_media
110
111
112

A media file demultiplexer, which extracts raw codec frames from a media file. It extracts audio, video and text data, reading directly from a file. All output ports require setting port streams, since the file may contain multiple streams on any domain. This component supports metadata extraction using standard OpenMAX IL metadata interfaces, see \autoref{sec:metadata} for a description of how metadata extraction is used. It also supports Broadcom-specific configurations to allow extra play modes. It also supports a clock input port.

PortIndexNotes
 OMX_IndexParamContentURI The filename containing the media file can be specified using this parameter. Currently the format of the URI is assumed to be a file that the component can directly access using the file system. However, the file system can support remote mounted file systems.
OMX_IndexConfigTimePosition Set the media time position, causing a seek in the file. Some file formats only support a seek to the start of the file, setting a different time position in one of these files will return an error.
OMX_IndexConfigTimeSeekMode Query / set the seek mode. If the file format does not support seeking, trying to set the seek mode will return a bad parameter error.
OMX_IndexConfigPlayMode Query / set whether we should return all frames, only IDR frames, or only IDR frames in reverse order. This can be both got and set on this component.
OMX_IndexConfigMetadataItemCount Query the number of metadata items at a particular scope level (All, Top, Node, or Port).
OMX_IndexConfigMetadataItem Query the value for a particular metadata item. The item can be specified by index, or searched for by name.
OMX_IndexParamMetadataFilterType Not implemented.
OMX_IndexConfigContainerNodeCount Query the number of metadata items within a particular container.
OMX_IndexConfigCounterNodeID Retrieve the Nth node within a particular container
OMX_IndexConfigDrmView This config parameter serves as a notification for DivX DRM protected rental files. Clients should detect any changes in this parameter using OMX_IndexConfigRequestCallback. It will be populated with the current view count and the maximum permissible view count if a DivX DRM rental file is opened. Clients should respond by setting OMX_IndexConfigConfirmView config parameter.
OMX_IndexConfigRequestCallback Set whether we enable a callback to the client when the value of this index structure changes. Only supported for the index OMX_IndexConfigDrmView.
OMX_IndexConfigConfirmView It is only applicable to DivX DRM rental files. This is a boolean config parameter. Setting this to TRUE will continue the playback of a rental file, while setting to FALSE has no effect, and the host application is expected to stop the playback afterwards.
OMX_IndexConfigDrmView This config parameter serves as a notification for DivX DRM protected rental files. Host applications should detect any changes in this parameter. It has two members, nCurrentView and nMaxView, which will be populated with the current view count and the maximum permissible view count if a DivX DRM rental file is opened. Host applications should respond by setting OMX_IndexConfigConfirmView config parameter.
OMX_IndexParamComponentName Sets the component name to be used in internal logging messages.
110 111 112OMX_IndexParamPortDefinition These are populated with the correct data when the port stream for the port has been chosen. Only the number of output buffers is allowed to be set.
OMX_IndexParamNumAvailableStreams When the file has been opened, we can query for the number of streams available on each port.
OMX_IndexParamActiveStream Query / set the active port stream.
OMX_IndexParamBrcmDataUnit Query the data format being delivered. This indicates whether we believe the data to be correctly framed in the file format. This parameter is read-only on this component.
OMX_IndexParamCodecConfig Query for codec-specific information. This is current used to transfer information such as aspect ratio, cropping, and codec-specific header bytes. This is currently only supported for VideoCore based components to query. It is read-only on this component.
110OMX_IndexParamAudioPortFormat Query / set the audio port format. This port supports several audio formats, although doesn't support any conversion so the audio format will be set when the stream has been inspected.
OMX_IndexParamAudioAmr Query the AMR properties. Currently eAMRBandMode is supported, and used to distinguish between different variants of AMR.
OMX_IndexParamAudioAac Query AAC format parameters.
OMX_IndexParamAudioMp3 Query MP3 format parameters.
OMX_IndexParamAudioDdp Query DDP format parameters. Currently eBitStreamId is used to distinguish between different variants of DDP.
OMX_IndexParamAudioPcm Query PCM audio parameter. Currently support sampling rate and no. of channels.
OMX_IndexParamAudioEvrc This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioG726 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioMidi This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioQcelp13 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioQcelp8 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioRa This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioVorbis This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamAudioWma This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexConfigBrcmAudioTrackGaplessPlayback Query encoder delay and padding information for gapless audio playback.
111OMX_IndexParamVideoPortFormat Query / set the video port format. This port supports several video formats, although doesn't support any conversion so the video format will be set when the stream has been inspected.
OMX_IndexParamNalStreamFormat Query the format of NAL units that will be output by the reader (OMX_NaluFormatStartCodes or OMX_NaluFormatOneNaluPerBuffer). A value of 0 means that the type can be found by looking at the codec configuration data. This is parameter is currently only relevant for AVC streams.
OMX_IndexParamVideoAvc This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamVideoH263 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamVideoMpeg2 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamVideoMpeg4 This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamVideoRv This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
OMX_IndexParamVideoWmv This parameter is handled but not filled in by the component. A query will return all zero values and a set must have all zero values.
112OMX_IndexParamOtherPortFormat Query / set the other port format. This port supports several text subtitle formats, although doesn't support any conversion so the format will be set when the stream has been inspected.

Supported Metadata Tree

protocol  
duration  
num_stream  
#audXXtype, bit_rate, sample_rate, num_channels 
title, artist, album, year, genre, track, lyrics, hasimage Present for MP3 files with ID3 tags. Only those tags present in the file are created when the file is parsed.
#vidXXtype, bit_rate, height, width 
levelPresent for MP4 files with a video stream.
Some handlers support multiple streams. A metadata container will be created for each stream, starting with #aud00, then #aud01 for audio streams, and #vid00, #vid01 etc for video streams. A port-level query for an item will return that item for the currently selected stream of that type.