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208 lines
11 KiB
C
208 lines
11 KiB
C
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/* GStreamer
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* Copyright (C) <2016> Carlos Rafael Giani <dv at pseudoterminal dot org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_RAW_BASE_PARSE_H__
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#define __GST_RAW_BASE_PARSE_H__
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#include <gst/gst.h>
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#include <gst/base/base.h>
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G_BEGIN_DECLS
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#define GST_TYPE_RAW_BASE_PARSE \
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(gst_raw_base_parse_get_type())
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#define GST_RAW_BASE_PARSE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParse))
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#define GST_RAW_BASE_PARSE_CAST(obj) \
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((GstRawBaseParse *)(obj))
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#define GST_RAW_BASE_PARSE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParseClass))
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#define GST_RAW_BASE_PARSE_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS((obj), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParseClass))
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#define GST_IS_RAW_BASE_PARSE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_RAW_BASE_PARSE))
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#define GST_IS_RAW_BASE_PARSE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_RAW_BASE_PARSE))
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#define GST_RAW_BASE_PARSE_CONFIG_MUTEX_LOCK(obj) g_mutex_lock(&(((GstRawBaseParse *)(obj))->config_mutex))
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#define GST_RAW_BASE_PARSE_CONFIG_MUTEX_UNLOCK(obj) g_mutex_unlock(&(((GstRawBaseParse *)(obj))->config_mutex))
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typedef enum _GstRawBaseParseConfig GstRawBaseParseConfig;
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typedef struct _GstRawBaseParse GstRawBaseParse;
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typedef struct _GstRawBaseParseClass GstRawBaseParseClass;
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/**
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* GstRawBaseParseConfig:
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* @GST_RAW_BASE_PARSE_CONFIG_CURRENT: configuration that is currently active
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* @GST_RAW_BASE_PARSE_CONFIG_SINKCAPS: configuration that is defined by the input sink caps
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* @GST_RAW_BASE_PARSE_CONFIG_PROPERTIES: configuration that is defined by class properties
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*
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* Identifier for the type of parser configuration.
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*/
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enum _GstRawBaseParseConfig
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{
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GST_RAW_BASE_PARSE_CONFIG_CURRENT = 1,
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GST_RAW_BASE_PARSE_CONFIG_SINKCAPS,
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GST_RAW_BASE_PARSE_CONFIG_PROPERTIES
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};
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/**
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* GstRawBaseParse:
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*
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* The opaque #GstRawBaseParse data structure.
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*/
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struct _GstRawBaseParse
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{
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GstBaseParse parent;
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/*< private > */
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/* TRUE if the source pad caps have been set already. This is used
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* for checking if the source pad caps have to be set. */
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gboolean src_caps_set;
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/* Mutex which protects access to and modifications on the configs. */
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GMutex config_mutex;
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};
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/**
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* GstRawBaseParseClass:
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* @parent_class: The parent class structure
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* @set_current_config: Sets the new current configuration. Subclasses must internally
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* switch to this new configuration. Return FALSE if this failed,
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* TRUE otherwise.
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* @get_current_config: Gets the current configuration. All return values except
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* except GST_RAW_BASE_PARSE_CONFIG_CURRENT are valid.
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* @set_config_from_caps: Parses the caps and copies its information to the configuration.
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* Returns FALSE if this failed, TRUE otheriwse. Specified caps
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* are not unref'd.
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* @get_caps_from_config: Creates a new caps structure out of the information from the
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* specified configuration. Ownership over the returned caps are
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* transferred to the caller. If something fails during the caps
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* creation, the vfunc must make sure to destroy any partially
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* created caps; the *caps value is always set to NULL in case of
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* failure. Returns FALSE in case of failure,
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* TRUE in case of success.
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* @get_config_frame_size: Gets the size of one frame, in bytes, from the specified
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* configuration. This must be the size of the complete frame,
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* including any overhead (metadata, headers, padding bytes etc.).
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* @get_max_frames_per_buffer: Optional.
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* Returns up to how many complete frames one output buffer may
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* contain. The value must be nonzero. This is useful for example
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* with video parsers which need to ensure that one output buffer
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* contains only one video frame, even if the input buffer contains
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* several complete frames. If this vfunc is not set, then there
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* is no maximum number of frames per buffer - the parser reads
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* as many complete frames as possible from the input buffer.
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* @is_config_ready: Returns TRUE if the specified configuration is ready, FALSE
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* otherwise.
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* @process: Optional.
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* This is useful to do any last minute processing before the
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* data is pushed downstream. One example is channel reordering
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* in audio parsers.
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* in_data is the complete input buffer, total_num_in_bytes is
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* the total amount of bytes this input buffer contains (including
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* excess bytes that form an incomplete rame). num_valid_in_bytes
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* is the subset of these bytes that are to be pushed downstream.
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* If for example the frame size is 4, and total_num_in_bytes is
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* 411, then num_valid_in_bytes will be 408, since the last 3
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* bytes form an incomplete frame.
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* The value of num_valid_in_bytes excludes the overhead bytes
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* indicated by @get_overhead_size.
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* If the subclass creates a new buffer here, *processed_data
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* must be set to the new buffer's pointer. If the subclass does
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* not create any new buffer, and just expects the first
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* num_valid_in_bytes of the input buffer to be pushed downstream,
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* then *processed_data must be set to NULL.
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* If this vfunc is not set, then the parser behaves as if this
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* vfunc set *processed_data data to NULL.
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* @is_unit_format_supported: Returns TRUE if the given format is supported by the
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* @get_units_per_second function, FALSE otherwise.
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* @get_units_per_second: Returns how many units per second exist for a given format.
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* For example, with an audio parser and format DEFAULT, the units
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* per second are typically the number of samples per second
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* (= the sample rate). For video parsers, this would be the frame
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* rate. If BYTES or TIME are used as format, then the result must
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* not include any extra overhead (metadata, headers, padding etc.)
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* @get_overhead_size: Optional.
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* Returns the number of bytes that make up the portion of a frame
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* that isn't payload. Examples are padding bytes, headers, and
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* other kinds of metadata. If this vfunc isn't defined, then an
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* overhead size of 0 bytes is assumed.
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*
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* Subclasses are required to override all vfuncs except for @process, which is optional.
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* The raw base parser lock is held during all vfunc calls.
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*/
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struct _GstRawBaseParseClass
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{
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GstBaseParseClass parent_class;
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gboolean (*set_current_config) (GstRawBaseParse *raw_base_parse,
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GstRawBaseParseConfig config);
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GstRawBaseParseConfig (*get_current_config) (GstRawBaseParse *raw_base_parse);
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gboolean (*set_config_from_caps) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config,
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GstCaps * caps);
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gboolean (*get_caps_from_config) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config,
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GstCaps ** caps);
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gsize (*get_config_frame_size) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config);
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guint (*get_max_frames_per_buffer) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config);
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gboolean (*is_config_ready) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config);
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gboolean (*process) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config,
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GstBuffer * in_data,
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gsize total_num_in_bytes,
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gsize num_valid_in_bytes,
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GstBuffer ** processed_data);
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gboolean (*is_unit_format_supported) (GstRawBaseParse * raw_base_parse,
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GstFormat format);
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void (*get_units_per_second) (GstRawBaseParse * raw_base_parse,
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GstFormat format,
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GstRawBaseParseConfig config,
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gsize * units_per_sec_n,
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gsize * units_per_sec_d);
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gint (*get_overhead_size) (GstRawBaseParse * raw_base_parse,
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GstRawBaseParseConfig config);
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};
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void gst_raw_base_parse_invalidate_src_caps (GstRawBaseParse * raw_base_parse);
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GType gst_raw_base_parse_get_type (void);
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G_END_DECLS
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#endif
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