/* GStreamer * Copyright (C) 2011 Mark Nauwelaerts . * Copyright (C) 2011 Nokia Corporation. All rights reserved. * Contact: Stefan Kost * * 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_BASE_AUDIO_ENCODER_H__ #define __GST_BASE_AUDIO_ENCODER_H__ #ifndef GST_USE_UNSTABLE_API #warning "GstBaseAudioEncoder is unstable API and may change in future." #warning "You can define GST_USE_UNSTABLE_API to avoid this warning." #endif #include #include #include G_BEGIN_DECLS #define GST_TYPE_BASE_AUDIO_ENCODER (gst_base_audio_encoder_get_type()) #define GST_BASE_AUDIO_ENCODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_AUDIO_ENCODER,GstBaseAudioEncoder)) #define GST_BASE_AUDIO_ENCODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_AUDIO_ENCODER,GstBaseAudioEncoderClass)) #define GST_BASE_AUDIO_ENCODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_AUDIO_ENCODER,GstBaseAudioEncoderClass)) #define GST_IS_BASE_AUDIO_ENCODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_AUDIO_ENCODER)) #define GST_IS_BASE_AUDIO_ENCODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_AUDIO_ENCODER)) #define GST_BASE_AUDIO_ENCODER_CAST(obj) ((GstBaseAudioEncoder *)(obj)) /** * GST_BASE_AUDIO_ENCODER_SINK_NAME: * * the name of the templates for the sink pad */ #define GST_BASE_AUDIO_ENCODER_SINK_NAME "sink" /** * GST_BASE_AUDIO_ENCODER_SRC_NAME: * * the name of the templates for the source pad */ #define GST_BASE_AUDIO_ENCODER_SRC_NAME "src" /** * GST_BASE_AUDIO_ENCODER_SRC_PAD: * @obj: base parse instance * * Gives the pointer to the source #GstPad object of the element. * * Since: 0.10.x */ #define GST_BASE_AUDIO_ENCODER_SRC_PAD(obj) (GST_BASE_AUDIO_ENCODER_CAST (obj)->srcpad) /** * GST_BASE_AUDIO_ENCODER_SINK_PAD: * @obj: base parse instance * * Gives the pointer to the sink #GstPad object of the element. * * Since: 0.10.x */ #define GST_BASE_AUDIO_ENCODER_SINK_PAD(obj) (GST_BASE_AUDIO_ENCODER_CAST (obj)->sinkpad) /** * GST_BASE_AUDIO_ENCODER_SEGMENT: * @obj: base parse instance * * Gives the segment of the element. * * Since: 0.10.x */ #define GST_BASE_AUDIO_ENCODER_SEGMENT(obj) (GST_BASE_AUDIO_ENCODER_CAST (obj)->segment) typedef struct _GstBaseAudioEncoder GstBaseAudioEncoder; typedef struct _GstBaseAudioEncoderClass GstBaseAudioEncoderClass; typedef struct _GstBaseAudioEncoderPrivate GstBaseAudioEncoderPrivate; typedef struct _GstBaseAudioEncoderContext GstBaseAudioEncoderContext; /** * GstAudioState: * @xint: whether sample data is int or float * @rate: rate of sample data * @channels: number of channels in sample data * @width: width (in bits) of sample data * @depth: used bits in sample data (if integer) * @sign: rate of sample data (if integer) * @endian: endianness of sample data * @bpf: bytes per audio frame */ typedef struct _GstAudioState { gboolean is_int; gint rate; gint channels; gint width; gint depth; gboolean sign; gint endian; GstAudioChannelPosition *channel_pos; gint bpf; } GstAudioState; /** * GstBaseAudioEncoderContext: * @state: a #GstAudioState describing input audio format * @frame_samples: number of samples (per channel) subclass needs to be handed, * or will be handed all available if 0. * @frame_max: max number of frames of size @frame_bytes accepted at once * (assumed minimally 1) * @min_latency: min latency of element * @max_latency: max latency of element * @lookahead: encoder lookahead (in units of input rate samples) * * Transparent #GstBaseAudioEncoderContext data structure. */ struct _GstBaseAudioEncoderContext { /* input */ GstAudioState state; /* output */ gint frame_samples; gint frame_max; gint lookahead; /* MT-protected (with LOCK) */ GstClockTime min_latency; GstClockTime max_latency; }; /** * GstBaseAudioEncoder: * @element: the parent element. * * The opaque #GstBaseAudioEncoder data structure. */ struct _GstBaseAudioEncoder { GstElement element; /*< protected >*/ /* source and sink pads */ GstPad *sinkpad; GstPad *srcpad; /* MT-protected (with STREAM_LOCK) */ GstSegment segment; GstBaseAudioEncoderContext *ctx; /* properties */ gint64 tolerance; gboolean perfect_ts; gboolean hard_resync; gboolean granule; /*< private >*/ GstBaseAudioEncoderPrivate *priv; gpointer _gst_reserved[GST_PADDING_LARGE]; }; /** * GstBaseAudioEncoderClass: * @start: Optional. * Called when the element starts processing. * Allows opening external resources. * @stop: Optional. * Called when the element stops processing. * Allows closing external resources. * @set_format: Notifies subclass of incoming data format. * GstBaseAudioEncoderContext fields have already been * set according to provided caps. * @handle_frame: Provides input samples (or NULL to clear any remaining data) * according to directions as provided by subclass in the * #GstBaseAudioEncoderContext. Input data ref management * is performed by base class, subclass should not care or * intervene. * @flush: Optional. * Instructs subclass to clear any codec caches and discard * any pending samples and not yet returned encoded data. * @event: Optional. * Event handler on the sink pad. This function should return * TRUE if the event was handled and should be discarded * (i.e. not unref'ed). * @pre_push: Optional. * Called just prior to pushing (encoded data) buffer downstream. * Subclass has full discretionary access to buffer, * and a not OK flow return will abort downstream pushing. * @getcaps: Optional. * Allows for a custom sink getcaps implementation (e.g. * for multichannel input specification). If not implemented, * default returns gst_base_audio_encoder_proxy_getcaps * applied to sink template caps. * * Subclasses can override any of the available virtual methods or not, as * needed. At minimum @set_format and @handle_frame needs to be overridden. */ struct _GstBaseAudioEncoderClass { GstElementClass parent_class; /*< public >*/ /* virtual methods for subclasses */ gboolean (*start) (GstBaseAudioEncoder *enc); gboolean (*stop) (GstBaseAudioEncoder *enc); gboolean (*set_format) (GstBaseAudioEncoder *enc, GstAudioState *state); GstFlowReturn (*handle_frame) (GstBaseAudioEncoder *enc, GstBuffer *buffer); void (*flush) (GstBaseAudioEncoder *enc); GstFlowReturn (*pre_push) (GstBaseAudioEncoder *enc, GstBuffer **buffer); gboolean (*event) (GstBaseAudioEncoder *enc, GstEvent *event); GstCaps * (*getcaps) (GstBaseAudioEncoder *enc); /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE]; }; GType gst_base_audio_encoder_get_type (void); GstFlowReturn gst_base_audio_encoder_finish_frame (GstBaseAudioEncoder * enc, GstBuffer *buffer, gint samples); GstCaps * gst_base_audio_encoder_proxy_getcaps (GstBaseAudioEncoder * enc, GstCaps * caps); GstCaps * gst_base_audio_encoder_add_streamheader (GstCaps * caps, GstBuffer * buf, ...); G_END_DECLS #endif /* __GST_BASE_AUDIO_ENCODER_H__ */