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gstreamer/gst-libs/gst/audio/gstringbuffer.h
Wim Taymans dae848818d audio: rework audio caps. 
Rework the audio caps similar to the video caps. Remove
width/depth/endianness/signed fields and replace with a simple string
format and media type audio/x-raw.
Create a GstAudioInfo and some helper methods to parse caps.
Remove duplicate code from the ringbuffer and replace with audio info.
Use AudioInfo in the base audio filter class.
Port elements to new API.
2011-08-18 19:15:03 +02:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstringbuffer.h:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_RING_BUFFER_H__
#define __GST_RING_BUFFER_H__
#include <gst/gst.h>
#include <gst/audio/audio.h>
G_BEGIN_DECLS
#define GST_TYPE_RING_BUFFER (gst_ring_buffer_get_type())
#define GST_RING_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RING_BUFFER,GstRingBuffer))
#define GST_RING_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RING_BUFFER,GstRingBufferClass))
#define GST_RING_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_RING_BUFFER, GstRingBufferClass))
#define GST_RING_BUFFER_CAST(obj) ((GstRingBuffer *)obj)
#define GST_IS_RING_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RING_BUFFER))
#define GST_IS_RING_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RING_BUFFER))
typedef struct _GstRingBuffer GstRingBuffer;
typedef struct _GstRingBufferClass GstRingBufferClass;
typedef struct _GstRingBufferSpec GstRingBufferSpec;
/**
* GstRingBufferCallback:
* @rbuf: a #GstRingBuffer
* @data: target to fill
* @len: amount to fill
* @user_data: user data
*
* This function is set with gst_ring_buffer_set_callback() and is
* called to fill the memory at @data with @len bytes of samples.
*/
typedef void (*GstRingBufferCallback) (GstRingBuffer *rbuf, guint8* data, guint len, gpointer user_data);
/**
* GstRingBufferState:
* @GST_RING_BUFFER_STATE_STOPPED: The ringbuffer is stopped
* @GST_RING_BUFFER_STATE_PAUSED: The ringbuffer is paused
* @GST_RING_BUFFER_STATE_STARTED: The ringbuffer is started
*
* The state of the ringbuffer.
*/
typedef enum {
GST_RING_BUFFER_STATE_STOPPED,
GST_RING_BUFFER_STATE_PAUSED,
GST_RING_BUFFER_STATE_STARTED
} GstRingBufferState;
/**
* GstRingBufferSegState:
* @GST_SEGSTATE_INVALID: The content of the segment is invalid
* @GST_SEGSTATE_EMPTY: The segment is empty
* @GST_SEGSTATE_FILLED: The segment contains valid data
* @GST_SEGSTATE_PARTIAL: The segment partially contains valid data
*
* The state of a segment in the ringbuffer.
*/
typedef enum {
GST_SEGSTATE_INVALID,
GST_SEGSTATE_EMPTY,
GST_SEGSTATE_FILLED,
GST_SEGSTATE_PARTIAL
} GstRingBufferSegState;
/**
* GstBufferFormatType:
* @GST_BUFTYPE_RAW: samples in linear or float
* @GST_BUFTYPE_MU_LAW: samples in mulaw
* @GST_BUFTYPE_A_LAW: samples in alaw
* @GST_BUFTYPE_IMA_ADPCM: samples in ima adpcm
* @GST_BUFTYPE_MPEG: samples in mpeg audio (but not AAC) format
* @GST_BUFTYPE_GSM: samples in gsm format
* @GST_BUFTYPE_IEC958: samples in IEC958 frames (e.g. AC3)
* @GST_BUFTYPE_AC3: samples in AC3 format
* @GST_BUFTYPE_EAC3: samples in EAC3 format
* @GST_BUFTYPE_DTS: samples in DTS format
* @GST_BUFTYPE_MPEG2_AAC: samples in MPEG-2 AAC format
* @GST_BUFTYPE_MPEG4_AAC: samples in MPEG-4 AAC format
*
* The format of the samples in the ringbuffer.
*/
typedef enum
{
GST_BUFTYPE_RAW,
GST_BUFTYPE_MU_LAW,
GST_BUFTYPE_A_LAW,
GST_BUFTYPE_IMA_ADPCM,
GST_BUFTYPE_MPEG,
GST_BUFTYPE_GSM,
GST_BUFTYPE_IEC958,
GST_BUFTYPE_AC3,
GST_BUFTYPE_EAC3,
GST_BUFTYPE_DTS,
GST_BUFTYPE_MPEG2_AAC,
GST_BUFTYPE_MPEG4_AAC,
} GstBufferFormatType;
/**
* GstRingBufferSpec:
* @caps: The caps that generated the Spec.
* @type: the sample type
* @format: the sample format
* @sign: the sample sign
* @bigend: the endianness of the samples
* @width: the width of the samples
* @depth: th depth of the samples
* @rate: the samplerate
* @channels: the number of channels
* @latency_time: the latency in microseconds
* @buffer_time: the total buffer size in microseconds
* @segsize: the size of one segment in bytes
* @segtotal: the total number of segments
* @bytes_per_sample: number of bytes in one sample
* @silence_sample: bytes representing one sample of silence
* @seglatency: number of segments queued in the lower level device,
* defaults to segtotal
*
* The structure containing the format specification of the ringbuffer.
*/
struct _GstRingBufferSpec
{
/*< public >*/
/* in */
GstCaps *caps; /* the caps of the buffer */
/* in/out */
GstBufferFormatType type;
GstAudioInfo info;
guint64 latency_time; /* the required/actual latency time, this is the
* actual the size of one segment and the
* minimum possible latency we can achieve. */
guint64 buffer_time; /* the required/actual time of the buffer, this is
* the total size of the buffer and maximum
* latency we can compensate for. */
gint segsize; /* size of one buffer segment in bytes, this value
* should be chosen to match latency_time as
* well as possible. */
gint segtotal; /* total number of segments, this value is the
* number of segments of @segsize and should be
* chosen so that it matches buffer_time as
* close as possible. */
/* ABI added 0.10.20 */
gint seglatency; /* number of segments queued in the lower
* level device, defaults to segtotal. */
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
#define GST_RING_BUFFER_GET_COND(buf) (((GstRingBuffer *)buf)->cond)
#define GST_RING_BUFFER_WAIT(buf) (g_cond_wait (GST_RING_BUFFER_GET_COND (buf), GST_OBJECT_GET_LOCK (buf)))
#define GST_RING_BUFFER_SIGNAL(buf) (g_cond_signal (GST_RING_BUFFER_GET_COND (buf)))
#define GST_RING_BUFFER_BROADCAST(buf)(g_cond_broadcast (GST_RING_BUFFER_GET_COND (buf)))
/**
* GstRingBuffer:
* @cond: used to signal start/stop/pause/resume actions
* @open: boolean indicating that the ringbuffer is open
* @acquired: boolean indicating that the ringbuffer is acquired
* @data: data in the ringbuffer
* @spec: format and layout of the ringbuffer data
* @segstate: status of each segment in the ringbuffer (unused)
* @samples_per_seg: number of samples in one segment
* @empty_seg: pointer to memory holding one segment of silence samples
* @state: state of the buffer
* @segdone: readpointer in the ringbuffer
* @segbase: segment corresponding to segment 0 (unused)
* @waiting: is a reader or writer waiting for a free segment
*
* The ringbuffer base class structure.
*/
struct _GstRingBuffer {
GstObject object;
/*< public >*/ /* with LOCK */
GCond *cond;
gboolean open;
gboolean acquired;
guint8 *memory;
gsize size;
GstRingBufferSpec spec;
GstRingBufferSegState *segstate;
gint samples_per_seg;
guint8 *empty_seg;
/*< public >*/ /* ATOMIC */
gint state;
gint segdone;
gint segbase;
gint waiting;
/*< private >*/
GstRingBufferCallback callback;
gpointer cb_data;
gboolean flushing;
/* ATOMIC */
gint may_start;
gboolean active;
/*< private >*/
gpointer _gst_reserved[GST_PADDING + 0];
};
/**
* GstRingBufferClass:
* @parent_class: parent class
* @open_device: open the device, don't set any params or allocate anything
* @acquire: allocate the resources for the ringbuffer using the given spec
* @release: free resources of the ringbuffer
* @close_device: close the device
* @start: start processing of samples
* @pause: pause processing of samples
* @resume: resume processing of samples after pause
* @stop: stop processing of samples
* @delay: get number of samples queued in device
* @activate: activate the thread that starts pulling and monitoring the
* consumed segments in the device. Since 0.10.22
* @commit: write samples into the ringbuffer
* @clear_all: clear the entire ringbuffer Since 0.10.24
*
* The vmethods that subclasses can override to implement the ringbuffer.
*/
struct _GstRingBufferClass {
GstObjectClass parent_class;
/*< public >*/
gboolean (*open_device) (GstRingBuffer *buf);
gboolean (*acquire) (GstRingBuffer *buf, GstRingBufferSpec *spec);
gboolean (*release) (GstRingBuffer *buf);
gboolean (*close_device) (GstRingBuffer *buf);
gboolean (*start) (GstRingBuffer *buf);
gboolean (*pause) (GstRingBuffer *buf);
gboolean (*resume) (GstRingBuffer *buf);
gboolean (*stop) (GstRingBuffer *buf);
guint (*delay) (GstRingBuffer *buf);
/* ABI added */
gboolean (*activate) (GstRingBuffer *buf, gboolean active);
guint (*commit) (GstRingBuffer * buf, guint64 *sample,
guchar * data, gint in_samples,
gint out_samples, gint * accum);
void (*clear_all) (GstRingBuffer * buf);
/*< private >*/
gpointer _gst_reserved[GST_PADDING - 3];
};
GType gst_ring_buffer_get_type(void);
/* callback stuff */
void gst_ring_buffer_set_callback (GstRingBuffer *buf, GstRingBufferCallback cb,
gpointer user_data);
gboolean gst_ring_buffer_parse_caps (GstRingBufferSpec *spec, GstCaps *caps);
void gst_ring_buffer_debug_spec_caps (GstRingBufferSpec *spec);
void gst_ring_buffer_debug_spec_buff (GstRingBufferSpec *spec);
gboolean gst_ring_buffer_convert (GstRingBuffer * buf, GstFormat src_fmt,
gint64 src_val, GstFormat dest_fmt,
gint64 * dest_val);
/* device state */
gboolean gst_ring_buffer_open_device (GstRingBuffer *buf);
gboolean gst_ring_buffer_close_device (GstRingBuffer *buf);
gboolean gst_ring_buffer_device_is_open (GstRingBuffer *buf);
/* allocate resources */
gboolean gst_ring_buffer_acquire (GstRingBuffer *buf, GstRingBufferSpec *spec);
gboolean gst_ring_buffer_release (GstRingBuffer *buf);
gboolean gst_ring_buffer_is_acquired (GstRingBuffer *buf);
/* activating */
gboolean gst_ring_buffer_activate (GstRingBuffer *buf, gboolean active);
gboolean gst_ring_buffer_is_active (GstRingBuffer *buf);
/* flushing */
void gst_ring_buffer_set_flushing (GstRingBuffer *buf, gboolean flushing);
/* playback/pause */
gboolean gst_ring_buffer_start (GstRingBuffer *buf);
gboolean gst_ring_buffer_pause (GstRingBuffer *buf);
gboolean gst_ring_buffer_stop (GstRingBuffer *buf);
/* get status */
guint gst_ring_buffer_delay (GstRingBuffer *buf);
guint64 gst_ring_buffer_samples_done (GstRingBuffer *buf);
void gst_ring_buffer_set_sample (GstRingBuffer *buf, guint64 sample);
/* clear all segments */
void gst_ring_buffer_clear_all (GstRingBuffer *buf);
/* commit samples */
guint gst_ring_buffer_commit (GstRingBuffer *buf, guint64 sample,
guchar *data, guint len);
guint gst_ring_buffer_commit_full (GstRingBuffer * buf, guint64 *sample,
guchar * data, gint in_samples,
gint out_samples, gint * accum);
/* read samples */
guint gst_ring_buffer_read (GstRingBuffer *buf, guint64 sample,
guchar *data, guint len);
/* mostly protected */
/* not yet implemented
gboolean gst_ring_buffer_prepare_write (GstRingBuffer *buf, gint *segment, guint8 **writeptr, gint *len);
*/
gboolean gst_ring_buffer_prepare_read (GstRingBuffer *buf, gint *segment, guint8 **readptr, gint *len);
void gst_ring_buffer_clear (GstRingBuffer *buf, gint segment);
void gst_ring_buffer_advance (GstRingBuffer *buf, guint advance);
void gst_ring_buffer_may_start (GstRingBuffer *buf, gboolean allowed);
G_END_DECLS
#endif /* __GST_RING_BUFFER_H__ */
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