29 Sep, 2015
6 commits
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This commit moves the codes related to data block processing from packet
streaming layer to AM824 layer.Each driver initializes amdtp stream structure for AM824 data block by
calling amdtp_am824_init(). Then, a memory block is allocated for AM824
specific structure. This memory block is released by calling
amdtp_stream_destroy().When setting streaming parameters, it calls amdtp_am824_set_parameters().
When starting packet streaming, it calls amdtp_stream_start(). When
stopping packet streaming, it calls amdtp_stream_stop().Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
In IEC 61883-6, MIDI messages are transferred in MIDI conformant data
channel. Essentially, packet streaming layer is not responsible for MIDI
functionality.This commit moves MIDI trigger helper function from the layer to AM824
layer. The rest of codes related to MIDI functionality will be moved in
later commits.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
In IEC 61883-6, several types of data are available in AM824 format. The
data is transferred in each data channel. The position of data channel in
data block differs depending on model.Current implementation has an array to map the index of data channel in an
data block to the position of actual data channel. The implementation
allows each driver to access the mapping directly.In later commit, the mapping is in specific structure pushed into an
opaque pointer. Helper functions are required.This commit adds the helper functions for this purpose. In IEC 61883-6,
AM824 format supports many data types, while this specification easily
causes over-engineering. Current AM824 implementation is allowed to handle
two types of data, Multi Bit Linear Audio data (=PCM samples) and MIDI
conformant data (=MIDI messages).Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
In IEC 61883-6, PCM frames are transferred in Multi Bit Linear Audio data
channel. The data channel transfers 16/20/24 bit PCM samples. Thus, PCM
substream has a constrain about it.This commit moves codes related to the constraint from packet streaming
layer to AM824 data block processing layer.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
The value of FDF field in CIP header is protocol-dependent. Thus, it's
better to allow data block processing layer to decide the value in any
timing.In AM824 data format, the value of FDF field in CIP header indicates
N-flag and Nominal Sampling Frequency Code (sfc). The N-flag is for
switching 'Clock-based rate control mode' and 'Command-based rate control
mode'. In our implementation, 'Clock-based rate control mode' is just
supported. Therefore, When sampling transfer frequency is decided, then
the FDF can be set.This commit replaces 'amdtp_stream_set_parameters' with
'amdtp_am824_set_parameters' to set the FDF. This is the same timing
to decide the ration between the number of data blocks and the number of
PCM frames.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
This commit adds data block processing layer for AM824 format. The new
layer initializes streaming layer with its value for fmt field.Currently, most implementation of data block processing still remains
streaming layer. In later commits, these codes will be moved to the layer.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
