/* GStreamer * Copyright (C) <2016> Carlos Rafael Giani * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifndef __GST_RAW_BASE_PARSE_H__ #define __GST_RAW_BASE_PARSE_H__ #include #include G_BEGIN_DECLS #define GST_TYPE_RAW_BASE_PARSE \ (gst_raw_base_parse_get_type()) #define GST_RAW_BASE_PARSE(obj) \ (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParse)) #define GST_RAW_BASE_PARSE_CAST(obj) \ ((GstRawBaseParse *)(obj)) #define GST_RAW_BASE_PARSE_CLASS(klass) \ (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParseClass)) #define GST_RAW_BASE_PARSE_GET_CLASS(obj) \ (G_TYPE_INSTANCE_GET_CLASS((obj), GST_TYPE_RAW_BASE_PARSE, GstRawBaseParseClass)) #define GST_IS_RAW_BASE_PARSE(obj) \ (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_RAW_BASE_PARSE)) #define GST_IS_RAW_BASE_PARSE_CLASS(klass) \ (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_RAW_BASE_PARSE)) #define GST_RAW_BASE_PARSE_CONFIG_MUTEX_LOCK(obj) g_mutex_lock(&(((GstRawBaseParse *)(obj))->config_mutex)) #define GST_RAW_BASE_PARSE_CONFIG_MUTEX_UNLOCK(obj) g_mutex_unlock(&(((GstRawBaseParse *)(obj))->config_mutex)) typedef enum _GstRawBaseParseConfig GstRawBaseParseConfig; typedef struct _GstRawBaseParse GstRawBaseParse; typedef struct _GstRawBaseParseClass GstRawBaseParseClass; /** * GstRawBaseParseConfig: * @GST_RAW_BASE_PARSE_CONFIG_CURRENT: configuration that is currently active * @GST_RAW_BASE_PARSE_CONFIG_SINKCAPS: configuration that is defined by the input sink caps * @GST_RAW_BASE_PARSE_CONFIG_PROPERTIES: configuration that is defined by class properties * * Identifier for the type of parser configuration. */ enum _GstRawBaseParseConfig { GST_RAW_BASE_PARSE_CONFIG_CURRENT = 1, GST_RAW_BASE_PARSE_CONFIG_SINKCAPS, GST_RAW_BASE_PARSE_CONFIG_PROPERTIES }; /** * GstRawBaseParse: * * The opaque #GstRawBaseParse data structure. */ struct _GstRawBaseParse { GstBaseParse parent; /*< private > */ /* TRUE if the source pad caps have been set already. This is used * for checking if the source pad caps have to be set. */ gboolean src_caps_set; /* Mutex which protects access to and modifications on the configs. */ GMutex config_mutex; }; /** * GstRawBaseParseClass: * @parent_class: The parent class structure * @set_current_config: Sets the new current configuration. Subclasses must internally * switch to this new configuration. Return FALSE if this failed, * TRUE otherwise. * @get_current_config: Gets the current configuration. All return values except * except GST_RAW_BASE_PARSE_CONFIG_CURRENT are valid. * @set_config_from_caps: Parses the caps and copies its information to the configuration. * Returns FALSE if this failed, TRUE otheriwse. Specified caps * are not unref'd. * @get_caps_from_config: Creates a new caps structure out of the information from the * specified configuration. Ownership over the returned caps are * transferred to the caller. If something fails during the caps * creation, the vfunc must make sure to destroy any partially * created caps; the *caps value is always set to NULL in case of * failure. Returns FALSE in case of failure, * TRUE in case of success. * @get_config_frame_size: Gets the size of one frame, in bytes, from the specified * configuration. This must be the size of the complete frame, * including any overhead (metadata, headers, padding bytes etc.). * @get_max_frames_per_buffer: Optional. * Returns up to how many complete frames one output buffer may * contain. The value must be nonzero. This is useful for example * with video parsers which need to ensure that one output buffer * contains only one video frame, even if the input buffer contains * several complete frames. If this vfunc is not set, then there * is no maximum number of frames per buffer - the parser reads * as many complete frames as possible from the input buffer. * @is_config_ready: Returns TRUE if the specified configuration is ready, FALSE * otherwise. * @process: Optional. * This is useful to do any last minute processing before the * data is pushed downstream. One example is channel reordering * in audio parsers. * in_data is the complete input buffer, total_num_in_bytes is * the total amount of bytes this input buffer contains (including * excess bytes that form an incomplete rame). num_valid_in_bytes * is the subset of these bytes that are to be pushed downstream. * If for example the frame size is 4, and total_num_in_bytes is * 411, then num_valid_in_bytes will be 408, since the last 3 * bytes form an incomplete frame. * The value of num_valid_in_bytes excludes the overhead bytes * indicated by @get_overhead_size. * If the subclass creates a new buffer here, *processed_data * must be set to the new buffer's pointer. If the subclass does * not create any new buffer, and just expects the first * num_valid_in_bytes of the input buffer to be pushed downstream, * then *processed_data must be set to NULL. * If this vfunc is not set, then the parser behaves as if this * vfunc set *processed_data data to NULL. * @is_unit_format_supported: Returns TRUE if the given format is supported by the * @get_units_per_second function, FALSE otherwise. * @get_units_per_second: Returns how many units per second exist for a given format. * For example, with an audio parser and format DEFAULT, the units * per second are typically the number of samples per second * (= the sample rate). For video parsers, this would be the frame * rate. If BYTES or TIME are used as format, then the result must * not include any extra overhead (metadata, headers, padding etc.) * @get_overhead_size: Optional. * Returns the number of bytes that make up the portion of a frame * that isn't payload. Examples are padding bytes, headers, and * other kinds of metadata. If this vfunc isn't defined, then an * overhead size of 0 bytes is assumed. * * Subclasses are required to override all vfuncs except for @process, which is optional. * The raw base parser lock is held during all vfunc calls. */ struct _GstRawBaseParseClass { GstBaseParseClass parent_class; gboolean (*set_current_config) (GstRawBaseParse *raw_base_parse, GstRawBaseParseConfig config); GstRawBaseParseConfig (*get_current_config) (GstRawBaseParse *raw_base_parse); gboolean (*set_config_from_caps) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config, GstCaps * caps); gboolean (*get_caps_from_config) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config, GstCaps ** caps); gsize (*get_config_frame_size) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config); guint (*get_max_frames_per_buffer) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config); gboolean (*is_config_ready) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config); gboolean (*process) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config, GstBuffer * in_data, gsize total_num_in_bytes, gsize num_valid_in_bytes, GstBuffer ** processed_data); gboolean (*is_unit_format_supported) (GstRawBaseParse * raw_base_parse, GstFormat format); void (*get_units_per_second) (GstRawBaseParse * raw_base_parse, GstFormat format, GstRawBaseParseConfig config, gsize * units_per_sec_n, gsize * units_per_sec_d); gint (*get_overhead_size) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config); gint (*get_alignment) (GstRawBaseParse * raw_base_parse, GstRawBaseParseConfig config); }; void gst_raw_base_parse_invalidate_src_caps (GstRawBaseParse * raw_base_parse); GType gst_raw_base_parse_get_type (void); G_END_DECLS #endif