Zvinyorwa zvechinyorwa zvakatorwa kubva kwangu
Kugadzira mita yechiyero chechiratidzo
Pakupedzisira
Muchinyorwa chino tichaunganidza chiratidzo chechiyero mita yedunhu uye tidzidze kuverenga kuyerwa kwemhedzisiro kubva kune sefa. Ngationgororei kuyera kwechiyero.
Iyo seti yemafirita akapihwa ne media streamer anosanganisira sefa, MS_VOLUME, iyo inokwanisa kuyera iyo RMS nhanho yechiratidzo ichipfuura nepakati payo, kurerutsa chiratidzo uye kuita akawanda anobatsira uye asingatarisirwe mabasa. Tichapa chinyorwa chose kune iyi sefa gare gare. Asi ikozvino tichaishandisa semamita.
Isu tinoshandisa toni jenareta sechiratidzo sosi, chiratidzo kubva icho chinotumirwa kune MS_VOLUME sefa, kune iyo inobuda iyo inonzwika kadhi yakabatana.
Mumuenzaniso uyu, isu tichashandisa jenareta sefa mune zvishoma zvakasiyana modhi - ichagadzira imwe-toni chiratidzo kwatiri, i.e. chiratidzo chine imwechete sinusoidal oscillation.
Pamusoro peiyo frequency uye amplitude, isu tichada kuseta nguva iyo chiratidzo chichagadzirwa; inofanirwa kunge yakakwana kuitira kuti nhamba yakakwana yemasampuli ipfuure nepakati MS_VOLUME sefa yekuyera. Kuendesa marongero kune jenareta, iyo MSDtmfGenCustomTone chimiro inoshandiswa:
struct _MSDtmfGenCustomTone{
char tone_name[8]; /* Π’Π΅ΠΊΡΡΠΎΠ²ΠΎΠ΅ Π½Π°Π·Π²Π°Π½ΠΈΠ΅ ΡΠΈΠ³Π½Π°Π»Π° ΠΈΠ· 8 Π±ΡΠΊΠ².*/
int duration; /* ΠΠ»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΡΠΈΠ³Π½Π°Π»Π° Π² ΠΌΠΈΠ»Π»ΠΈΡΠ΅ΠΊΡΠ½Π΄Π°Ρ
.*/
int frequencies[2]; /* ΠΠ°ΡΠ° ΡΠ°ΡΡΠΎΡ ΠΈΠ· ΠΊΠΎΡΠΎΡΡΡ
Π΄ΠΎΠ»ΠΆΠ΅Π½ ΡΠΎΡΡΠΎΡΡΡ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΡΠΈΠ³Π½Π°Π». */
float amplitude; /* ΠΠΌΠΏΠ»ΠΈΡΡΠ΄Π° ΡΠΎΠ½ΠΎΠ², 1.0 ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΠ΅Ρ ΡΡΠΎΠ²Π½Ρ 0 Π΄Π ΠΎΡ ΠΌΠΈΠ»Π»ΠΈΠ²Π°ΡΡΠ° Π½Π° Π½Π°Π³ΡΡΠ·ΠΊΠ΅ 600 ΠΠΌ.*/
int interval; /* ΠΠ°ΡΠ·Π° Π² ΠΌΠΈΠ»Π»ΠΈΡΠ΅ΠΊΡΠ½Π΄Π°Ρ
ΠΏΠ΅ΡΠ΅Π΄ Π½Π°ΡΠ°Π»ΠΎΠΌ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ³ΡΡΠ²Π°Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»Π°.*/
int repeat_count; /* ΠΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΏΠΎΠ²ΡΠΎΡΠΎΠ².*/
};
typedef struct _MSDtmfGenCustomTone MSDtmfGenCustomTone;
Kutanga jenareta, tichashandisa nzira yayo yeMS_DTMF_GEN_PLAY_CUSTOM.
Block dhayagiramu yechiratidzo chekugadzirisa:
Kodhi yepurogiramu inoshandisa chirongwa ichi inoratidzwa pazasi.
/* Π€Π°ΠΉΠ» mstest3.c */
#include <mediastreamer2/msfilter.h>
#include <mediastreamer2/msticker.h>
#include <mediastreamer2/dtmfgen.h>
#include <mediastreamer2/mssndcard.h>
#include <mediastreamer2/msvolume.h>
int main()
{
ms_init();
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΊΠ·Π΅ΠΌΠΏΠ»ΡΡΡ ΡΠΈΠ»ΡΡΡΠΎΠ². */
MSFilter *voidsource=ms_filter_new(MS_VOID_SOURCE_ID);
MSFilter *dtmfgen=ms_filter_new(MS_DTMF_GEN_ID);
MSFilter *volume=ms_filter_new(MS_VOLUME_ID);
MSSndCard *card_playback=ms_snd_card_manager_get_default_card(ms_snd_card_manager_get());
MSFilter *snd_card_write=ms_snd_card_create_writer(card_playback);
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΈΠΊΠ΅Ρ. */
MSTicker *ticker=ms_ticker_new();
/* Π‘ΠΎΠ΅Π΄ΠΈΠ½ΡΠ΅ΠΌ ΡΠΈΠ»ΡΡΡΡ Π² ΡΠ΅ΠΏΠΎΡΠΊΡ. */
ms_filter_link(voidsource, 0, dtmfgen, 0);
ms_filter_link(dtmfgen, 0, volume, 0);
ms_filter_link(volume, 0, snd_card_write, 0);
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ ΡΠ°ΠΊΡΠΎΠ². */
ms_ticker_attach(ticker,voidsource);
MSDtmfGenCustomTone dtmf_cfg;
/* Π£ΡΡΠ°Π½Π°Π²Π»ΠΈΠ²Π°Π΅ΠΌ ΠΈΠΌΡ Π½Π°ΡΠ΅Π³ΠΎ ΡΠΈΠ³Π½Π°Π»Π°, ΠΏΠΎΠΌΠ½Ρ ΠΎ ΡΠΎΠΌ, ΡΡΠΎ Π² ΠΌΠ°ΡΡΠΈΠ²Π΅ ΠΌΡ Π΄ΠΎΠ»ΠΆΠ½Ρ
ΠΎΡΡΠ°Π²ΠΈΡΡ ΠΌΠ΅ΡΡΠΎ Π΄Π»Ρ Π½ΡΠ»Ρ, ΠΊΠΎΡΠΎΡΡΠΉ ΠΎΠ±ΠΎΠ·Π½Π°ΡΠ°Π΅Ρ ΠΊΠΎΠ½Π΅Ρ ΡΡΡΠΎΠΊΠΈ. */
strncpy(dtmf_cfg.tone_name, "busy", sizeof(dtmf_cfg.tone_name));
dtmf_cfg.duration=1000;
dtmf_cfg.frequencies[0]=440; /* ΠΡΠ΄Π΅ΠΌ Π³Π΅Π½Π΅ΡΠΈΡΠΎΠ²Π°ΡΡ ΠΎΠ΄ΠΈΠ½ ΡΠΎΠ½, ΡΠ°ΡΡΠΎΡΡ Π²ΡΠΎΡΠΎΠ³ΠΎ ΡΠΎΠ½Π° ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠΌ Π² 0.*/
dtmf_cfg.frequencies[1]=0;
dtmf_cfg.amplitude=1.0; /* Π’Π°ΠΊΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Π΅ ΡΠΈΠ½ΡΡΠ° Π΄ΠΎΠ»ΠΆΠ΅Π½ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΎΠ²Π°ΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°Ρ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ 0.707.*/
dtmf_cfg.interval=0.;
dtmf_cfg.repeat_count=0.;
/* ΠΠΊΠ»ΡΡΠ°Π΅ΠΌ Π·Π²ΡΠΊΠΎΠ²ΠΎΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡ. */
ms_filter_call_method(dtmfgen, MS_DTMF_GEN_PLAY_CUSTOM, (void*)&dtmf_cfg);
/* ΠΠ°Π΅ΠΌ, Π²ΡΠ΅ΠΌΡ ΠΏΠΎΠ»ΠΎΠ²ΠΈΠ½Ρ ΡΠ΅ΠΊΡΠ½Π΄Ρ, ΡΡΠΎΠ±Ρ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠ΅Π»Ρ Π½Π°ΠΊΠΎΠΏΠΈΠ» Π΄Π°Π½Π½ΡΠ΅. */
ms_usleep(500000);
/* Π§ΠΈΡΠ°Π΅ΠΌ ΡΠ΅Π·ΡΠ»ΡΡΠ°Ρ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ. */
float level=0;
ms_filter_call_method(volume, MS_VOLUME_GET_LINEAR,&level);
printf("ΠΠΌΠΏΠ»ΠΈΡΡΠ΄Π΅ ΡΠΈΠ½ΡΡΠ° %f Π²ΠΎΠ»ΡΡ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΠ΅Ρ ΡΡΠ΅Π΄Π½Π΅ΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅ %f Π²ΠΎΠ»ΡΡ.n", dtmf_cfg.amplitude, level);
}
Isu tinonyora muenzaniso wedu, sezvatakaita kare, tichingoshandisa zita refaira mstest3. Ngatimhanyei uye titore mhedzisiro:
ΠΠΌΠΏΠ»ΠΈΡΡΠ΄Π΅ ΡΠΈΠ½ΡΡΠ° 1.000000 Π²ΠΎΠ»ΡΡ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΠ΅Ρ ΡΡΠ΅Π΄Π½Π΅ΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅ 0.707733 Π²ΠΎΠ»ΡΡ.
Sezvauri kuona, mugumisiro wekuyera wakapindirana nenzvimbo yechitatu yedesimali ine kukosha kwedzidziso yakaenzana neskweya mudzi wezvikamu zviviri zvakakamurwa nepakati: sqr(2)/2=0,7071067811865475
Kutsauswa kwehukama kwemhedzisiro kubva paukoshi hwechokwadi hwaive 0.1%. Takaongorora chikanganiso chekuyera pachiyero chechiratidzo chepamusoro. Saizvozvowo, sezvo chiyero chinoderera, kukanganisa kunofanira kuwedzera. Ini ndinokurudzira kuti uzviongorore iwe pachako kune yakaderera masaini mazinga.
Muchinyorwa chinotevera tichaunganidza dunhu rinoona kuvepo kwechiratidzo chetoni yenguva yakapihwa painopinza uchishandisa toni detector. Isu tichadzidzawo maitiro ekugadzirisa zviitiko zvinogadzirwa nemasefa.
Source: www.habr.com