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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2023-06-19 10:28:05 +0100
committerTakashi Iwai <tiwai@suse.de>2023-06-21 07:28:31 +0200
commit7ea9ee0064281ef630e038f8dd2f6e8f4030a696 (patch)
treeb091aafb960d17c45d6c6f5561e328fffecde3b1 /Documentation/sound
parent79597c8bf64ca99eab385115743131d260339da5 (diff)
ALSA: compress: allow setting codec params after next track
For gapless playback it is possible that each track can have different codec profile with same decoder, for example we have WMA album, we may have different tracks as WMA v9, WMA v10 and so on Or if DSP's like QDSP have abililty to switch decoders on single stream for each track, then this call could be used to set new codec parameters. Existing code does not allow to change this profile while doing gapless playback. Reuse existing SNDRV_COMPRESS_SET_PARAMS to set this new track params along some additional checks to enforce proper state machine. With this new changes now the user can call SNDRV_COMPRESS_SET_PARAMS anytime after setting next track and additional check in write should also ensure that params are set before writing new data. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Acked-by: Vinod Koul <vkoul@kernel.org> Link: https://lore.kernel.org/r/20230619092805.21649-1-srinivas.kandagatla@linaro.org Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/designs/compress-offload.rst11
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/sound/designs/compress-offload.rst b/Documentation/sound/designs/compress-offload.rst
index 935f325dbc77..655624f77092 100644
--- a/Documentation/sound/designs/compress-offload.rst
+++ b/Documentation/sound/designs/compress-offload.rst
@@ -268,11 +268,12 @@ with setting of meta_data and signalling for next track ::
| |
| V
| +----------+
- | | |
- | |NEXT_TRACK|
- | | |
- | +----------+
- | |
+ | compr_set_params() | |
+ | +-----------|NEXT_TRACK|
+ | | | |
+ | | +--+-------+
+ | | | |
+ | +--------------+ |
| |
| | compr_partial_drain()
| |