[alsa-devel] [RFC 3/5] compress: add API header and driver header files
Vinod Koul
vinod.koul at linux.intel.com
Fri Sep 2 08:06:23 CEST 2011
This patch adds the header files for ioctl definations and header file for
driver APIs for lower level device drivers to use
Signed-off-by: Vinod Koul <vinod.koul at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
include/sound/compress_driver.h | 138 ++++++++++++++++++++++++++++++++++++++
include/sound/compress_offload.h | 137 +++++++++++++++++++++++++++++++++++++
2 files changed, 275 insertions(+), 0 deletions(-)
create mode 100644 include/sound/compress_driver.h
create mode 100644 include/sound/compress_offload.h
diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
new file mode 100644
index 0000000..e5fbbf1
--- /dev/null
+++ b/include/sound/compress_driver.h
@@ -0,0 +1,138 @@
+/*
+ * compress_driver.h - compress offload driver definations
+ *
+ * Copyright (C) 2011 Intel Corporation
+ * Authors: Vinod Koul <vinod.koul at linux.intel.com>
+ * Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+#ifndef __COMPRESS_DRIVER_H
+#define __COMPRESS_DRIVER_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
+ * @periods: number of such fragments
+ * @hw_pointer: offset of last location in buffer where DSP copied data
+ * @app_pointer: offset of last location in buffer where app wrote data
+ * @sleep: poll sleep
+ */
+struct snd_compr_runtime {
+ snd_pcm_state_t state;
+ struct snd_compr_ops *ops;
+ void *buffer;
+ size_t buffer_size;
+ size_t fragment_size;
+ unsigned int periods;
+ size_t hw_pointer;
+ size_t app_pointer;
+ wait_queue_head_t sleep;
+};
+
+/**
+ * struct snd_compr_stream: compressed stream
+ * @name: device name
+ * @ops: pointer to DSP callbacks
+ * @runtime: pointer to runtime structure
+ * @device: device pointer
+ * @direction: stream direction, playback/recording
+ * @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;
+ unsigned int direction;
+ 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
+ * @trigger: Trigger operations like start, pause, resume, drain, stop. 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_compr_params *params);
+ 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, const 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);
+ 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: Device pointer
+ * @lock: device lock
+ * @ops: pointer to DSP callbacks
+ * @private_data: pointer to DSP pvt data
+ */
+struct snd_compr {
+ const char *name;
+ struct device *dev;
+ struct mutex lock;
+ struct snd_compr_ops *ops;
+ struct list_head list;
+ void *private_data;
+};
+
+
+int snd_compress_register(struct snd_compr *device);
+int snd_compress_deregister(struct snd_compr *device);
+void snd_compr_period_elapsed(struct snd_compr_stream *stream);
+
+#endif
diff --git a/include/sound/compress_offload.h b/include/sound/compress_offload.h
new file mode 100644
index 0000000..48f816f
--- /dev/null
+++ b/include/sound/compress_offload.h
@@ -0,0 +1,137 @@
+/*
+ * compress_offload.h - compress offload header definations
+ *
+ * Copyright (C) 2011 Intel Corporation
+ * Authors: Vinod Koul <vinod.koul at linux.intel.com>
+ * Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+#ifndef __COMPRESS_OFFLOAD_H
+#define __COMPRESS_OFFLOAD_H
+
+#include <linux/types.h>
+/**
+ * struct snd_compressed_buffer:compressed buffer
+ * @fragment_size: size of buffer fragment in bytes
+ * @periods: number of such fragments
+ */
+struct snd_compressed_buffer {
+ size_t fragment_size;
+ int periods;
+};
+
+/* */
+struct snd_compr_params {
+ struct snd_compressed_buffer buffer;
+ struct SndAudioCodecSettings codec;
+};
+
+/**
+ * struct snd_compr_tstamp: timestamp descriptor
+ * @copied_bytes: Number of bytes offset in ring buffer to DSP
+ * @copied_total: Total number of bytes copied from ring buffer to DSP
+ * @decoded: Frames decoded by DSP
+ * @rendered: Frames rendered by DSP into a mixer or an audio output
+ * @sampling_rate: sampling rate of audio
+ */
+struct snd_compr_tstamp {
+ size_t copied_bytes;
+ size_t copied_total;
+ size_t decoded;
+ size_t rendered;
+ __u32 sampling_rate;
+};
+
+/**
+ * struct snd_compr_avail: avail descriptor
+ * @avail: Number of bytes available in ring buffer for writing/reading
+ * @tstamp: timestamp infomation
+ */
+struct snd_compr_avail {
+ size_t avail;
+ struct snd_compr_tstamp tstamp;
+};
+
+/**
+ * struct snd_compr_caps: caps descriptor
+ * @codecs: pointer to array of codecs
+ * @min_fragment_size: minimum fragment supported by DSP
+ * @max_fragment_size: maximum fragment supported by DSP
+ * @min_periods: min periods supported by DSP
+ * @max_periods: max periods supported by DSP
+ * @num_codecs: number of codecs supported
+ * @reserved: reserved field
+ */
+struct snd_compr_caps {
+ __u32 num_codecs;
+ __u32 min_fragment_size;
+ __u32 max_fragment_size;
+ __u32 min_periods;
+ __u32 max_periods;
+ __u32 codecs[MAX_NUM_CODECS];
+ __u32 reserved[11];
+};
+
+/**
+ * struct snd_compr_codec_caps: query capability of codec
+ * @codec: codec for which capability is queried
+ * @num_descriptors: number of codec descriptors
+ * @descriptor: array of codec capability descriptor
+ */
+struct snd_compr_codec_caps {
+ __u32 codec;
+ __u32 num_descriptors;
+ struct SndAudioCodecDescriptor descriptor[MAX_NUM_CODEC_DESCRIPTORS];
+};
+
+/**
+ * compress path ioctl definitions
+ * SNDRV_COMPRESS_GET_CAPS: Query capability of DSP
+ * SNDRV_COMPRESS_GET_CODEC_CAPS: Query capability of a codec
+ * SNDRV_COMPRESS_SET_PARAMS: Set codec and stream parameters
+ * Note: only codec params can be changed runtime and stream params cant be
+ * SNDRV_COMPRESS_GET_PARAMS: Query codec and stream params
+ * SNDRV_COMPRESS_TSTAMP: get the current timestamp value
+ * SNDRV_COMPRESS_AVAIL: get the current buffer avail value.
+ * This also queries the tstamp properties
+ * SNDRV_COMPRESS_PAUSE: Pause the running stream
+ * SNDRV_COMPRESS_RESUME: resume a paused stream
+ * SNDRV_COMPRESS_START: Start a stream
+ * SNDRV_COMPRESS_STOP: stop a running stream, discarding ring buffer content and
+ * buffers current with DSP
+ * SNDRV_COMPRESS_DRAIN: Play till end of buffers and stop after that
+ */
+#define SNDRV_COMPRESS_GET_CAPS _IOWR('C', 0x00, struct snd_compr_caps *)
+#define SNDRV_COMPRESS_GET_CODEC_CAPS _IOWR('C', 0x01, struct snd_compr_codec_caps *)
+#define SNDRV_COMPRESS_SET_PARAMS _IOW('C', 0x02, struct snd_compr_params *)
+#define SNDRV_COMPRESS_GET_PARAMS _IOR('C', 0x03, struct snd_compr_params *)
+#define SNDRV_COMPRESS_TSTAMP _IOR('C', 0x10, struct snd_compr_tstamp *)
+#define SNDRV_COMPRESS_AVAIL _IOR('C', 0x11, struct snd_compr_avail *)
+#define SNDRV_COMPRESS_PAUSE _IO('C', 0x20)
+#define SNDRV_COMPRESS_RESUME _IO('C', 0x21)
+#define SNDRV_COMPRESS_START _IO('C', 0x22)
+#define SNDRV_COMPRESS_STOP _IO('C', 0x23)
+#define SNDRV_COMPRESS_DRAIN _IO('C', 0x24)
+/*
+ * TODO
+ * 1. add mmap support
+ *
+ */
+#define SND_COMPR_TRIGGER_DRAIN 7 /*FIXME move this to pcm.h */
+#endif
--
1.7.0.4
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