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mediastreamer2 library - modular sound and video processing and streaming
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Copyright (C) 2006 Simon MORLAT (simon.morlat@linphone.org)
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include "allfilters.h"
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typedef void (*MSFilterFunc)(struct _MSFilter *f);
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typedef int (*MSFilterMethodFunc)(struct _MSFilter *f, void *arg);
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typedef void (*MSFilterNotifyFunc)(void *userdata , unsigned int id, void *arg);
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struct _MSFilterMethod{
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MSFilterMethodFunc method;
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typedef struct _MSFilterMethod MSFilterMethod;
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enum _MSFilterCategory{
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typedef enum _MSFilterCategory MSFilterCategory;
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MSFilterId id; /* the id declared in allfilters.h */
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const char *name; /* filter name */
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const char *text; /*some descriptive text*/
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MSFilterCategory category;
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const char *enc_fmt; /* must be set if MS_FILTER_ENCODER/MS_FILTER_DECODER */
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int ninputs; /*number of inputs */
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int noutputs; /*number of outputs */
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MSFilterFunc preprocess; /* called once before processing */
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MSFilterFunc process; /* called every tick to do the filter's job*/
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MSFilterFunc postprocess; /*called once after processing */
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MSFilterMethod *methods;
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typedef struct _MSFilterDesc MSFilterDesc;
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/*protected attributes */
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MSFilterNotifyFunc notify;
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struct _MSTicker *ticker;
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/*private attributes */
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typedef struct _MSFilter MSFilter;
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/* useful for plugins only */
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void ms_filter_register(MSFilterDesc *desc);
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/* functions to retrieve encoders/decoders according to codec name */
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MSFilterDesc * ms_filter_get_encoder(const char *mime);
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MSFilterDesc * ms_filter_get_decoder(const char *mime);
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MSFilter * ms_filter_create_encoder(const char *mime);
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MSFilter * ms_filter_create_decoder(const char *mime);
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bool_t ms_filter_codec_supported(const char *mime);
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MSFilter *ms_filter_new(MSFilterId id);
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MSFilter *ms_filter_new_from_name(const char *name);
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int ms_filter_link(MSFilter *f1, int pin1, MSFilter *f2, int pin2);
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int ms_filter_unlink(MSFilter *f1, int pin1, MSFilter *f2, int pin2);
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int ms_filter_call_method(MSFilter *f, unsigned int id, void *arg);
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int ms_filter_call_method_noarg(MSFilter *f, unsigned int id);
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void ms_filter_set_notify_callback(MSFilter *f, MSFilterNotifyFunc fn, void *userdata);
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MSFilterId ms_filter_get_id(MSFilter *f);
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void ms_filter_destroy(MSFilter *f);
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/* I define the id taking the lower bits of the address of the MSFilterDesc object,
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the method index (_cnt_) and the argument size */
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/* I hope using this to avoid type mismatch (calling a method on the wrong filter)*/
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#define MS_FILTER_METHOD_ID(_id_,_cnt_,_argsize_) \
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( (((unsigned long)(_id_)) & 0xFFFF)<<16 | (_cnt_<<8) | (_argsize_ & 0xFF ))
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#define MS_FILTER_METHOD(_id_,_count_,_argtype_) \
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MS_FILTER_METHOD_ID(_id_,_count_,sizeof(_argtype_))
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#define MS_FILTER_METHOD_NO_ARG(_id_,_count_) \
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MS_FILTER_METHOD_ID(_id_,_count_,0)
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#define MS_FILTER_BASE_METHOD(_count_,_argtype_) \
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MS_FILTER_METHOD_ID(MS_FILTER_BASE_ID,_count_,sizeof(_argtype_))
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#define MS_FILTER_EVENT(_id_,_count_,_argtype_) \
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MS_FILTER_METHOD_ID(_id_,_count_,sizeof(_argtype_))
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#define MS_FILTER_EVENT_NO_ARG(_id_,_count_)\
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MS_FILTER_METHOD_ID(_id_,_count_,0)
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/* some MSFilter base methods:*/
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#define MS_FILTER_SET_SAMPLE_RATE MS_FILTER_BASE_METHOD(0,int)
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#define MS_FILTER_GET_SAMPLE_RATE MS_FILTER_BASE_METHOD(1,int)
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#define MS_FILTER_SET_BITRATE MS_FILTER_BASE_METHOD(2,int)
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#define MS_FILTER_GET_BITRATE MS_FILTER_BASE_METHOD(3,int)
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#define MS_FILTER_SET_FMTP MS_FILTER_BASE_METHOD(4,const char)
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#define MS_FILTER_GET_NCHANNELS MS_FILTER_BASE_METHOD(5,int)
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#define MS_FILTER_SET_NCHANNELS MS_FILTER_BASE_METHOD(6,int)
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#define MS_FILTER_ADD_FMTP MS_FILTER_BASE_METHOD(7,const char)
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#define MS_FILTER_ADD_ATTR MS_FILTER_BASE_METHOD(8,const char)
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#define MS_FILTER_SET_MTU MS_FILTER_BASE_METHOD(9,int)
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#define MS_FILTER_GET_MTU MS_FILTER_BASE_METHOD(10,int)
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MSFilter *ms_filter_new_from_desc(MSFilterDesc *desc);
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void ms_filter_process(MSFilter *f);
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void ms_filter_preprocess(MSFilter *f, struct _MSTicker *t);
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void ms_filter_postprocess(MSFilter *f);
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bool_t ms_filter_inputs_have_data(MSFilter *f);
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void ms_filter_notify(MSFilter *f, unsigned int id, void *arg);
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void ms_filter_notify_no_arg(MSFilter *f, unsigned int id);
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#define ms_filter_lock(f) ms_mutex_lock(&(f)->lock)
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#define ms_filter_unlock(f) ms_mutex_unlock(&(f)->lock)
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void ms_filter_unregister_all(void);
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/* used by awk script in Makefile.am to generate alldescs.c */
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#define MS_FILTER_DESC_EXPORT(desc)
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mediastreamer2/include/mediastreamer2/msfilter.h
