/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2005 Wim Taymans * * 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 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_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; /* called to fill 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_LINEAR: samples in linear PCM * @GST_BUFTYPE_FLOAT: samples in 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 format * @GST_BUFTYPE_GSM: samples in gsm format * * The format of the samples in the ringbuffer. */ typedef enum { GST_BUFTYPE_LINEAR, GST_BUFTYPE_FLOAT, GST_BUFTYPE_MU_LAW, GST_BUFTYPE_A_LAW, GST_BUFTYPE_IMA_ADPCM, GST_BUFTYPE_MPEG, GST_BUFTYPE_GSM, } GstBufferFormatType; typedef enum { GST_UNKNOWN, GST_S8, GST_U8, GST_S16_LE, GST_S16_BE, GST_U16_LE, GST_U16_BE, GST_S24_LE, GST_S24_BE, GST_U24_LE, GST_U24_BE, GST_S32_LE, GST_S32_BE, GST_U32_LE, GST_U32_BE, GST_S24_3LE, GST_S24_3BE, GST_U24_3LE, GST_U24_3BE, GST_S20_3LE, GST_S20_3BE, GST_U20_3LE, GST_U20_3BE, GST_S18_3LE, GST_S18_3BE, GST_U18_3LE, GST_U18_3BE, GST_FLOAT32_LE, GST_FLOAT32_BE, GST_FLOAT64_LE, GST_FLOAT64_BE, GST_MU_LAW, GST_A_LAW, GST_IMA_ADPCM, GST_MPEG, GST_GSM, /* fill me */ } GstBufferFormat; /** * 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 * * The structure containing the format specification of the ringbuffer. */ struct _GstRingBufferSpec { /*< public >*/ /* in */ GstCaps *caps; /* the caps of the buffer */ /* in/out */ GstBufferFormatType type; GstBufferFormat format; gboolean sign; gboolean bigend; gint width; gint depth; gint rate; gint channels; guint64 latency_time; /* the required/actual latency time */ guint64 buffer_time; /* the required/actual time of the buffer */ gint segsize; /* size of one buffer segement */ gint segtotal; /* total number of segments */ /* out */ gint bytes_per_sample; /* number of bytes of one sample */ guint8 silence_sample[32]; /* bytes representing silence */ /*< 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; GstBuffer *data; 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; /*< private >*/ union { struct { gboolean flushing; /* ATOMIC */ gint may_start; } ABI; /* adding + 0 to mark ABI change to be undone later */ gpointer _gst_reserved[GST_PADDING + 0]; } abidata; }; /** * GstRingBufferClass: * @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 * * 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); /*< private >*/ gpointer _gst_reserved[GST_PADDING]; }; 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); /* 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); /* 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); /* read samples */ guint gst_ring_buffer_read (GstRingBuffer *buf, guint64 sample, guchar *data, guint len); /* mostly protected */ 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__ */