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Release 4.12 include/sound/compress_driver.h

Directory: include/sound
 *  compress_driver.h - compress offload driver definations
 *  Copyright (C) 2011 Intel Corporation
 *  Authors:    Vinod Koul <>
 *              Pierre-Louis Bossart <>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  General Public License for more details.
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


#include <linux/types.h>
#include <linux/sched.h>
#include <sound/core.h>
#include <sound/compress_offload.h>
#include <sound/asound.h>
#include <sound/pcm.h>

struct snd_compr_ops;

 * struct snd_compr_runtime: runtime stream description
 * @state: stream state
 * @ops: pointer to DSP callbacks
 * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
 *      DSP doesn't implement copy
 * @buffer_size: size of the above buffer
 * @fragment_size: size of buffer fragment in bytes
 * @fragments: number of such fragments
 * @total_bytes_available: cumulative number of bytes made available in
 *      the ring buffer
 * @total_bytes_transferred: cumulative bytes transferred by offload DSP
 * @sleep: poll sleep
 * @private_data: driver private data pointer

struct snd_compr_runtime {
snd_pcm_state_t state;
struct snd_compr_ops *ops;
void *buffer;
u64 buffer_size;
u32 fragment_size;
u32 fragments;
u64 total_bytes_available;
u64 total_bytes_transferred;
wait_queue_head_t sleep;
void *private_data;

 * struct snd_compr_stream: compressed stream
 * @name: device name
 * @ops: pointer to DSP callbacks
 * @runtime: pointer to runtime structure
 * @device: device pointer
 * @error_work: delayed work used when closing the stream due to an error
 * @direction: stream direction, playback/recording
 * @metadata_set: metadata set flag, true when set
 * @next_track: has userspace signal next track transition, true when set
 * @private_data: pointer to DSP private data

struct snd_compr_stream {
const char *name;
struct snd_compr_ops *ops;
struct snd_compr_runtime *runtime;
struct snd_compr *device;
struct delayed_work error_work;
enum snd_compr_direction direction;
bool metadata_set;
bool next_track;
void *private_data;

 * struct snd_compr_ops: compressed path DSP operations
 * @open: Open the compressed stream
 * This callback is mandatory and shall keep dsp ready to receive the stream
 * parameter
 * @free: Close the compressed stream, mandatory
 * @set_params: Sets the compressed stream parameters, mandatory
 * This can be called in during stream creation only to set codec params
 * and the stream properties
 * @get_params: retrieve the codec parameters, mandatory
 * @set_metadata: Set the metadata values for a stream
 * @get_metadata: retrieves the requested metadata values from stream
 * @trigger: Trigger operations like start, pause, resume, drain, stop.
 * This callback is mandatory
 * @pointer: Retrieve current h/w pointer information. Mandatory
 * @copy: Copy the compressed data to/from userspace, Optional
 * Can't be implemented if DSP supports mmap
 * @mmap: DSP mmap method to mmap DSP memory
 * @ack: Ack for DSP when data is written to audio buffer, Optional
 * Not valid if copy is implemented
 * @get_caps: Retrieve DSP capabilities, mandatory
 * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory

struct snd_compr_ops {
int (*open)(struct snd_compr_stream *stream);
int (*free)(struct snd_compr_stream *stream);
int (*set_params)(struct snd_compr_stream *stream,
			struct snd_compr_params *params);
int (*get_params)(struct snd_compr_stream *stream,
			struct snd_codec *params);
int (*set_metadata)(struct snd_compr_stream *stream,
			struct snd_compr_metadata *metadata);
int (*get_metadata)(struct snd_compr_stream *stream,
			struct snd_compr_metadata *metadata);
int (*trigger)(struct snd_compr_stream *stream, int cmd);
int (*pointer)(struct snd_compr_stream *stream,
			struct snd_compr_tstamp *tstamp);
int (*copy)(struct snd_compr_stream *stream, char __user *buf,
		       size_t count);
int (*mmap)(struct snd_compr_stream *stream,
			struct vm_area_struct *vma);
int (*ack)(struct snd_compr_stream *stream, size_t bytes);
int (*get_caps) (struct snd_compr_stream *stream,
			struct snd_compr_caps *caps);
int (*get_codec_caps) (struct snd_compr_stream *stream,
			struct snd_compr_codec_caps *codec);

 * struct snd_compr: Compressed device
 * @name: DSP device name
 * @dev: associated device instance
 * @ops: pointer to DSP callbacks
 * @private_data: pointer to DSP pvt data
 * @card: sound card pointer
 * @direction: Playback or capture direction
 * @lock: device lock
 * @device: device id

struct snd_compr {
const char *name;
struct device dev;
struct snd_compr_ops *ops;
void *private_data;
struct snd_card *card;
unsigned int direction;
struct mutex lock;
int device;
	/* private: */
char id[64];
struct snd_info_entry *proc_root;
struct snd_info_entry *proc_info_entry;

/* compress device register APIs */
int snd_compress_register(struct snd_compr *device);
int snd_compress_deregister(struct snd_compr *device);
int snd_compress_new(struct snd_card *card, int device,
			int type, const char *id, struct snd_compr *compr);

/* dsp driver callback apis
 * For playback: driver should call snd_compress_fragment_elapsed() to let the
 * framework know that a fragment has been consumed from the ring buffer
 * For recording: we want to know when a frame is available or when
 * at least one frame is available so snd_compress_frame_elapsed()
 * callback should be called when a encodeded frame is available

static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream) { wake_up(&stream->runtime->sleep); }


Vinod Koul22100.00%1100.00%

static inline void snd_compr_drain_notify(struct snd_compr_stream *stream) { if (snd_BUG_ON(!stream)) return; stream->runtime->state = SNDRV_PCM_STATE_SETUP; wake_up(&stream->runtime->sleep); }


Vinod Koul39100.00%2100.00%

int snd_compr_stop_error(struct snd_compr_stream *stream, snd_pcm_state_t state); #endif

Overall Contributors

Vinod Koul42182.55%538.46%
Jeeja KP407.84%17.69%
Richard Fitzgerald265.10%215.38%
Charles Keepax173.33%17.69%
Qais Yousef30.59%17.69%
Takashi Iwai20.39%215.38%
Masanari Iida10.20%17.69%
Directory: include/sound
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