This function is base on the accelerator implementation
for compress API:
04177158cf98 ("ALSA: compress_offload: introduce accel operation mode")
Audio signal processing also has the requirement for memory to
memory similar as Video.
This asrc memory to memory (memory ->asrc->memory) case is a non
real time use case.
User fills the input buffer to the asrc module, after conversion, then asrc
sends back the output buffer to user. So it is not a traditional ALSA playback
and capture case.
Because we had implemented the "memory -> asrc ->i2s device-> codec"
use case in ALSA. Now the "memory->asrc->memory" needs
to reuse the code in asrc driver, so the patch 1 and patch 2 is for refining
the code to make it can be shared by the "memory->asrc->memory"
driver.
Other change is to add memory to memory support for two kinds of i.MX ASRC
modules.
changes in v6:
- rebase to latest tree, change to use 'MODULE_IMPORT_NS("DMA_BUF")'
- Add Acked-by: Vinod Koul for patch 1/6
changes in v5:
- Drop Jaroslav Kysela's patch as it has been merged.
- Add Jaroslav Kysela's Acked-by tag, received in v3.
changes in v4:
- remove the RFC tag, no comments receive in v3
- Add Jaroslav Kysela's patch in this patch set. because it may be
better for reviewing in a full patch set.
- Fix the list_for_each_entry_reverse to list_for_each_entry_safe_reverse
- Fix some coding style issues in Jaroslav Kysela's patch
changes in v3:
- use Jaroslav's suggestion for header file compress_params.h (PATCH 01)
- remove the ASRC_OUTPUT_FORMAT/ASRC_OUTPUT_RATE definition
- remove ASRC_RATIO_MOD in this version because it uses .set_metadata()
Will wait Jaroslav's update or other better method in the future.
- Address some comments from Pierre.
changes in v2:
- Remove the changes in compress API
- drop the SNDRV_COMPRESS_SRC_RATIO_MOD
- drop the SND_AUDIOCODEC_SRC and struct snd_dec_src
- define private metadata key value
ASRC_OUTPUT_FORMAT/ASRC_OUTPUT_RATE/ASRC_RATIO_MOD
Shengjiu Wang (6):
ALSA: compress: Add output rate and output format support
ASoC: fsl_asrc: define functions for memory to memory usage
ASoC: fsl_easrc: define functions for memory to memory usage
ASoC: fsl_asrc_m2m: Add memory to memory function
ASoC: fsl_asrc: register m2m platform device
ASoC: fsl_easrc: register m2m platform device
include/uapi/sound/compress_params.h | 23 +-
sound/soc/fsl/Kconfig | 1 +
sound/soc/fsl/Makefile | 2 +-
sound/soc/fsl/fsl_asrc.c | 179 ++++++-
sound/soc/fsl/fsl_asrc.h | 2 +
sound/soc/fsl/fsl_asrc_common.h | 70 +++
sound/soc/fsl/fsl_asrc_m2m.c | 727 +++++++++++++++++++++++++++
sound/soc/fsl/fsl_easrc.c | 261 +++++++++-
sound/soc/fsl/fsl_easrc.h | 4 +
9 files changed, 1260 insertions(+), 9 deletions(-)
create mode 100644 sound/soc/fsl/fsl_asrc_m2m.c
--
2.34.1
