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8e6d070148
As part of this, in alsa-udev.c, certain structures and variables referred to as "device" are renamed to "card". Otherwise, there is ambiguity, since "device" can mean a udev device, an SPA device, a compress-offload device, a PCM device etc. Also, replace "card id" with "card number" to emphasize that these integers are not actually SPA object IDs.
66 lines
3.6 KiB
C
66 lines
3.6 KiB
C
#ifndef COMPRESS_OFFLOAD_API_H
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#define COMPRESS_OFFLOAD_API_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <sound/compress_offload.h>
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#include <sound/compress_params.h>
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#include <spa/support/log.h>
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#include "compress-offload-api-util.h"
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struct compress_offload_api_context;
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/* This is a simple encapsulation of the ALSA Compress-Offload API
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* and its ioctl calls. It is intentionally not using any PipeWire
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* or SPA headers to allow for porting it or extracting it as its
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* own library in the future if needed. It functions as an alternative
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* to tinycompress, and was written, because tinycompress lacks
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* critical functionality (it does not expose important device caps)
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* and adds little value in this particular use case.
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*
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* Encapsulating the ioctls behind this API also allows for using
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* different backends. This might be interesting in the future for
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* testing purposes; for example, an alternative backend could exist
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* that emulates a compress-offload device by decoding with FFmpeg.
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* This would be useful for debugging compressed audio related issues
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* in PipeWire on the PC - an important advantage, since getting to
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* actual compress-offload hardware can sometimes be difficult. */
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COMPR_API_PRIVATE struct compress_offload_api_context* compress_offload_api_open(int card_nr, int device_nr,
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struct spa_log *log);
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COMPR_API_PRIVATE void compress_offload_api_close(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_get_fd(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_set_params(struct compress_offload_api_context *context,
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struct snd_codec *codec, uint32_t fragment_size,
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uint32_t num_fragments);
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COMPR_API_PRIVATE void compress_offload_api_get_fragment_config(struct compress_offload_api_context *context,
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uint32_t *fragment_size, uint32_t *num_fragments);
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COMPR_API_PRIVATE const struct snd_compr_caps * compress_offload_api_get_caps(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_get_codec_caps(struct compress_offload_api_context *context,
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uint32_t codec_id, struct snd_compr_codec_caps *codec_caps);
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COMPR_API_PRIVATE bool compress_offload_api_supports_codec(struct compress_offload_api_context *context, uint32_t codec_id);
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COMPR_API_PRIVATE int compress_offload_api_start(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_stop(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_pause(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_resume(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_drain(struct compress_offload_api_context *context);
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COMPR_API_PRIVATE int compress_offload_api_get_timestamp(struct compress_offload_api_context *context,
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struct snd_compr_tstamp *timestamp);
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COMPR_API_PRIVATE int compress_offload_api_get_available_space(struct compress_offload_api_context *context,
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struct snd_compr_avail *available_space);
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COMPR_API_PRIVATE int compress_offload_api_write(struct compress_offload_api_context *context,
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const void *data, size_t size);
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#endif /* COMPRESS_OFFLOAD_API_H */
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