1 寮曡█ 杩戝咕骞�锛屽祵鍏ュ紡鏁�(sh霉)瀛楅煶闋荤敘(ch菐n)鍝佸彈鍒拌秺渚嗚秺澶氭秷璨�(f猫i)鑰呯殑闈掔潪銆傚湪MP3銆佹墜姗�(j墨)绛夋秷璨�(f猫i)椤為浕瀛愮敘(ch菐n)鍝佷腑锛屼汉鍊戝皪浜庨€欎簺鍊�(g猫)浜虹祩绔殑瑕佹眰鏃╁凡涓嶉檺浜庡柈绱旈€氳┍鍜岀啊鍠殑鏂囧瓧铏曠悊锛岄珮璩�(zh矛)閲忕殑闊虫晥鏄暥(d膩ng)鍓嶇櫦(f膩)灞曠殑閲嶈瓒ㄥ嫝銆傚祵鍏ュ紡闊抽牷绯荤当(t菕ng)鍒嗙偤纭欢瑷�(sh猫)瑷�(j矛)鍜岃粺浠惰ō(sh猫)瑷�(j矛)銆傜‖浠堕儴鍒嗛噰鐢ㄥ熀浜庘叀S绺界窔鐨勯煶闋荤郴绲�(t菕ng)楂旂郴绲�(ji茅)妲�(g貌u)銆傝粺浠朵笂锛屽祵鍏ュ紡Linux鏄竴绋畬鍏ㄩ枊鏀句笖鍏嶈不(f猫i)鐨勬搷浣滅郴绲�(t菕ng)銆傚畠鏀寔澶氱ó纭欢楂旂郴绲�(ji茅)妲�(g貌u)锛屽収(n猫i)鏍搁亱(y霉n)琛岄珮鏁堛€佺┅(w臎n)瀹�锛岃€屼笖婧愪唬纰奸枊鏀撅紝鏈夎憲瀹屽杽鐨勯枊鐧�(f膩)宸ュ叿锛岀偤闁嬬櫦(f膩)浜哄摗鎻愪緵浜嗗劒(y艒u)鑹殑闁嬬櫦(f膩)鐠�(hu谩n)澧冦€� 鏈枃鍒╃敤samsung鍏徃鐨凷3C2410鍨嬪井铏曠悊鍣ㄥ拰Philips鍏徃鐨刄DAl341鍨嬬珛楂旇伈闊抽牷CODEC妲�(g貌u)閫犱簡宓屽叆寮忛煶闋荤郴绲�(t菕ng)锛岀郸鍑虹浉闂�(gu膩n)纭欢闆昏矾鐨勮ō(sh猫)瑷�(j矛)锛屼粙绱硅┎闊抽牷绯荤当(t菕ng)鍩轰簬Linux2.4鍏�(n猫i)鏍哥増鏈殑椹�(q奴)鍕曠▼搴�?q奴)宕縁(xi脿n)銆� 2 ARM920T鍙奡3C2410绨′粙 ARM920T鏄疉RM鍏徃绯诲垪寰檿鐞嗗櫒鏍哥殑涓€绋紝瀹冮噰鐢�5闅庢绠￠亾鍖栨妧琛�(sh霉)锛屽悓鏅�(sh铆)閰嶅倷浜員humb鎿�(ku貌)灞�銆丒mbedded ICE瑾�(di脿o)瑭︽妧琛�(sh霉)鍜孒arvard绺界窔銆傚湪鐢熺敘(ch菐n)宸ヨ棟鐩稿悓鐨勬儏娉佷笅锛屾€ц兘鍙仈(d谩)ARM7TDMI鐨�2鍊嶄互涓娿€係3C2410鏄疭amsung鍏徃閲囩敤0.18 渭m宸ヨ棟鍒� 閫犵殑ARM9TDMI鏍稿井铏曠悊鍣�銆傚畠鏈夌崹(d煤)绔嬬殑16KB鎸囦护Cache銆�16KB鏁�(sh霉)鎿�(j霉)Cache鍜孧MU锛岄€欎竴鐗规€т娇寰楅枊鐧�(f膩)浜哄摗鍙互鐩存帴灏嘗inux绉绘鍒板熀浜庤┎铏曠悊鍣ㄧ殑鐩(bi膩o)绯荤当(t菕ng)涓€� 3 鍩轰簬鈪绺界窔鐨勭‖浠舵鏋跺(sh铆)鐝�(xi脿n) 鈪锛圛nter-IC Sound锛夌附绶氭槸Philips鍏徃鎻愬嚭鐨勪覆琛屾暩(sh霉)瀛楅煶闋荤附绶氬崝(xi茅)璀�銆傚畠鏄竴绋潰鍚戝濯掗珨鐨勯煶闋荤附绶�锛屽皥鐢ㄤ簬闊抽牷瑷�(sh猫)鍌欎箣闁撶殑鏁�(sh霉)鎿�(j霉)鍌宠几锛岀偤鏁�(sh霉)瀛楃珛楂旇伈鎻愪緵搴忓垪鐨勯€ｆ帴鑷虫(bi膩o)婧�(zh菙n)绶ㄨВ纰煎櫒銆傗叀S绺界窔鍙檿鐞嗚伈闊虫暩(sh霉)鎿�(j霉)銆傚叾浠栦俊铏燂紙濡傛帶鍒朵俊铏燂級蹇呴爤鍠崹(d煤)鍌宠几銆傜偤浜嗕娇闆昏矾鐨勫紩鍑哄紩鑵崇洝鍙兘灏�锛屸叀S鍙娇鐢ㄤ簡3姊濅覆琛岀附绶氾細鎻愪緵鍒嗘檪(sh铆)寰�(f霉)鐢ㄥ姛鑳界殑鏁�(sh霉)鎿�(j霉)绶氥€佸瓧娈甸伕鎿囩窔鍜屾檪(sh铆)閻樹俊铏熺窔銆� 鏁村€�(g猫)闊抽牷绯荤当(t菕ng)鐨勭‖浠堕儴鍒嗕富瑕佹槸CPU鍜孋ODEC鐨勯€ｆ帴鑸囧(sh铆)鐝�(xi脿n)銆傛湰绯荤当(t菕ng)閲囩敤Philips鍩轰簬鈪闊抽牷绺界窔鐨刄DAl34l鍨嬮煶闋籆ODEC銆傝┎CODEC鏀寔鈪绺界窔鏁�(sh霉)鎿�(j霉)鏍煎紡锛岄噰鐢ㄤ綅鍏冩祦杞�(zhu菐n)鎻涙妧琛�(sh霉)閫�(j矛n)琛屼俊铏熻檿鐞�锛屽叿鏈夊彲绶ㄧ▼澧炵泭鏀惧ぇ鍣紙PGA锛夊拰鏁�(sh霉)瀛楄嚜鍕曞鐩婃帶鍒跺櫒锛圓GC锛�銆� S3C2410鍏�(n猫i)缃叀S绺界窔鎺ュ彛锛屽彲鐩存帴澶栨帴8/16姣旂壒鐨勭珛楂旇伈CODEC銆傚畠閭勫彲浠ョ郸FIFO閫氶亾鎻愪緵DMA鍌宠几妯″紡鑰岄潪涓柗妯″紡锛屽緸鑰屼娇鏁�(sh霉)鎿�(j霉)鐧�(f膩)閫佸拰鎺ユ敹鍚屾檪(sh铆)閫�(j矛n)琛�銆傝┎鈪鎺ュ彛鏈�3绋伐浣滄柟寮忥紝鍙互閫氶亷瑷�(sh猫)缃叀SCON瀵勫瓨鍣ㄤ締閬告搰銆傛湰鏂囦粙绱圭殑纭欢妗嗘灦鍩轰簬鍌宠几鍜屾帴鏀舵ā寮忋€傚湪閫欑ó妯″紡涓�锛屸叀S鏁�(sh霉)鎿�(j霉)绶氬皣閫氶亷闆欓€氶亾DMA鍚屾檪(sh铆)鎺ユ敹鍜岀櫦(f膩)閫侀煶闋绘暩(sh霉)鎿�(j霉)锛孌MA鏈嶅嫏(w霉)璜嬫眰鐢盕IFO鍙畝瀵勫瓨鍣ㄨ嚜鍕曞畬鎴�銆係3C2410鏀寔4閫氶亾閫ｆ帴绯荤当(t菕ng)绺界窔锛圓HB锛夊拰澶栧湇绺界窔锛圓PB锛夌殑DMA鎺у埗鍣�銆傝〃1鍒楀嚭S3C2410鐨勫悇閫氶亾璜嬫眰婧�銆� 鐐轰簡瀵�(sh铆)鐝�(xi脿n)闊抽牷鏁�(sh霉)鎿�(j霉)鐨勫叏闆欏伐鍌宠几锛岄渶瑕佷娇鐢⊿3C2410鐨勯€氶亾1鍜岄€氶亾2锛氭帴鏀舵暩(sh霉)鎿�(j霉)閬告搰閫氶亾1鍜岀櫦(f膩)閫佹暩(sh霉)鎿�(j霉)閬告搰閫氶亾2銆係3C2410鐨凞MA鎺у埗鍣ㄦ矑鏈夊収(n猫i)缃殑DMA瀛樺劜鍗€(q奴)鍩�锛屽洜鑰岀▼搴忎腑蹇呴爤鐐洪煶闋昏ō(sh猫)鍌欏垎閰岲MA绶╁瓨鍗€(q奴)锛岄€氶亷DMA鐩存帴灏囬渶瑕佸洖鏀炬垨閷勯煶鐨勬暩(sh霉)鎿�(j霉)鏀惧湪鍏�(n猫i)瀛樼殑DMA绶╁瓨鍗€(q奴)涓�銆� 濡傚湒1鎵€绀�锛孲3C2410鐨勨叀S绺界窔淇¤櫉鑸嘦-DAl34l鐨勨叀S淇¤櫉鐩存帴鐩搁€ｃ€侺3鎺ュ彛鐨勫紩鑵矻3MODE銆丩3CLOCK鍜孡3DATA鍒嗗垾閫ｆ帴鍒癝3-C2410鐨凣PBl銆丟PB2鍜孏PB3閫氱敤鏁�(sh霉)鎿�(j霉)杓稿嚭寮曡叧銆俇DAl34l灏嶅鎻愪緵鍏╃祫闊抽牷淇¤櫉杓稿叆鎺ュ彛锛屾瘡绲勫寘鎷乏鍙�2鍊�(g猫)鑱查亾銆� 濡傚湒2鎵€绀�锛�2绲勯煶闋昏几鍏ュ湪UDAl34l鍏�(n猫i)閮ㄧ殑铏曠悊瀛樺湪寰堝ぇ宸垾锛氱涓€绲勯煶闋讳俊铏熻几鍏ュ悗缍�(j墨ng)閬�1鍊�(g猫)0 dB/6 dB闁嬮棞(gu膩n)鍚庨噰妯ｉ€佸叆鏁�(sh霉)瀛楁贩闊冲櫒锛涚浜岀祫闊抽牷淇¤櫉杓稿叆鍚庡厛缍�(j墨ng)閬庡彲绶ㄧ▼澧炵泭鏀惧ぇ鍣紙PGA锛�锛岀劧鍚庡啀閫�(j矛n)琛岄噰妯ｏ紝閲囨ǎ鍚庣殑鏁�(sh霉)鎿�(j霉)瑕佸啀缍�(j墨ng)閬庢暩(sh霉)瀛楄嚜鍕曞鐩婃帶鍒跺櫒锛圓GC锛夐€佸叆鏁�(sh霉)瀛楁贩闊冲櫒銆傝ō(sh猫)瑷�(j矛)纭欢闆昏矾鏅�(sh铆)閬哥敤绗簩绲勮几鍏ラ煶闋讳俊铏�銆傚洜?y脿n)姗勶辑顛恒劅^杌熶欢鐨勬柟娉曞(sh铆)鐝�(xi脿n)灏嶇郴绲�(t菕ng)杓稿叆闊抽噺澶у皬鐨勮(di脿o)绡€(ji茅)锛岄’鐒堕伕鐢ㄧ浜岀祫鍙互閫氶亷L3绺界窔鎺ュ彛鎺у埗AGC渚嗗(sh铆)鐝�(xi脿n)銆傚彟澶�锛岄伕鎿囬€氶亾2閭勫彲浠ラ€氶亷PGA灏嶅緸NIC杓稿叆鐨勪俊铏熼€�(j矛n)琛岀墖鍏�(n猫i)鏀惧ぇ銆� 鐢变簬鈪绺界窔鍙檿鐞嗛煶闋绘暩(sh霉)鎿�(j霉)锛屽洜姝DAl34l閭勫収(n猫i)缃簡鐢ㄤ簬鍌宠几鎺у埗淇¤櫉鐨凩3绺界窔鎺ュ彛銆侺3鎺ュ彛鐩哥暥(d膩ng)浜庢贩闊冲櫒鎺у埗鎺ュ彛锛屽彲浠ユ帶鍒惰几鍏�/杓稿嚭闊抽牷淇¤櫉鐨勪綆闊冲強闊抽噺澶у皬绛夈€侺3鎺ュ彛鎺ュ湪S3C2410鐨�3鍊�(g猫)閫氱敤GPIO杓稿叆杓稿嚭寮曡叧涓�锛屽埄鐢ㄩ€�3鍊�(g猫)I/O鍙ｆā鎿琇3绺界窔鐨勫叏閮ㄦ檪(sh铆)搴忓拰鍗�(xi茅)璀�銆傞€欓噷涓€瀹氳娉ㄦ剰L3绺界窔鐨勬檪(sh铆)閻樹笉鏄€ｇ簩(x霉)鏅�(sh铆)閻�锛屽畠鍙湪鏁�(sh霉)鎿�(j霉)绶氫笂鏈夋暩(sh霉)鎿�(j霉)鏅�(sh铆)鎵嶇櫦(f膩)鍑�8鍊�(g猫)鍛ㄦ湡鐨勬檪(sh铆)閻樹俊铏�锛屽叾浠栨儏娉佷笅鏅�(sh铆)閻樼窔濮嬬祩淇濇寔楂橀浕骞�銆� 4 Linux涓嬮煶闋婚﹨(q奴)鍕曠殑瀵�(sh铆)鐝�(xi脿n) 瑷�(sh猫)鍌欓﹨(q奴)鍕曠▼搴忔槸鎿嶄綔绯荤当(t菕ng)鍏�(n猫i)鏍稿拰姗�(j墨)鍣ㄧ‖浠朵箣闁撶殑鎺ュ彛锛岀偤鎳�(y墨ng)鐢ㄧ▼搴忓睆钄戒簡纭欢绱�(x矛)绡€(ji茅)銆傝ō(sh猫)鍌欓﹨(q奴)鍕曟槸鍏�(n猫i)鏍哥殑涓€閮ㄥ垎锛屼富瑕佸畬鎴愪互涓嬪姛鑳斤細瑷�(sh猫)鍌欏垵濮嬪寲鍜岄噵鏀�锛涜ō(sh猫)鍌欑鐞嗭紝鍖呮嫭瀵�(sh铆)鏅�(sh铆)鍙冩暩(sh霉)瑷�(sh猫)缃強鎻愪緵灏嶈ō(sh猫)鍌欑殑鎿嶄綔鎺ュ彛锛涜畝鍙栨噳(y墨ng)鐢ㄧ▼搴忓偝閫佺郸瑷�(sh猫)鍌欐枃浠剁殑鏁�(sh霉)鎿�(j霉)骞跺洖閫佹噳(y墨ng)鐢ㄧ▼搴忚珛姹傜殑鏁�(sh霉)鎿�(j霉)锛涙娓拰铏曠悊瑷�(sh猫)鍌欏嚭鐝�(xi脿n)鐨勯尟(cu貌)瑾�銆� 闊抽牷瑷�(sh猫)鍌欓﹨(q奴)鍕曠▼搴忎富瑕侀€氶亷灏嶇‖浠剁殑鎺у埗瀵�(sh铆)鐝�(xi脿n)闊抽牷娴佺殑鍌宠几锛屽悓鏅�(sh铆)鍚戜笂灞ゆ彁渚涙(bi膩o)婧�(zh菙n)鐨勯煶闋绘帴鍙ｃ€傜瓎鑰呰ō(sh猫)瑷�(j矛)鐨勯煶闋绘帴鍙ｉ﹨(q奴)鍕曞悜涓婃彁渚�2鍊�(g猫)妯�(bi膩o)婧�(zh菙n)鎺ュ彛锛氭暩(sh霉)瀛楅煶闋昏檿鐞嗭紙Digital Sound Processing-DSP锛�锛岃矤(f霉)璨�(z茅)闊抽牷鏁�(sh霉)鎿�(j霉)鐨勫偝杓稿嵆鎾斁鏁�(sh霉)瀛楀寲鑱查煶鏂囦欢鍜岄寗闊虫搷浣滅瓑锛涙贩闊冲櫒锛圡IXER锛�锛岃矤(f霉)璨�(z茅)灏嶈几鍑洪煶闋婚€�(j矛n)琛屾贩闊宠檿鐞�锛屽闊抽噺瑾�(di脿o)绡€(ji茅)銆侀珮浣庨煶鎺у埗绛�銆傞€�2鍊�(g猫)妯�(bi膩o)婧�(zh菙n)鎺ュ彛鍒嗗垾灏嶆噳(y墨ng)瑷�(sh猫)鍌欐枃浠禿ev/dsp鍜宒ev/mixer銆� 鏁村€�(g猫)闊抽牷椹�(q奴)鍕曠殑瀵�(sh铆)鐝�(xi脿n)鍒嗙偤鍒濆鍖栥€佹墦闁嬭ō(sh猫)鍌�銆丏SP椹�(q奴)鍕曘€丮IXER椹�(q奴)鍕曞拰閲嬫斁瑷�(sh猫)鍌欑瓑閮ㄥ垎銆� 4.1 鍒濆鍖栥€佹墦闁嬭ō(sh猫)鍌� 瑷�(sh猫)鍌欏垵濮嬪寲涓昏瀹屾垚灏峌DAl34l闊抽噺銆侀噰妯ｉ牷鐜�銆丩3鎺ュ彛绛夌殑鍒濆鍖�锛屽苟涓旀敞鍐婅ō(sh猫)鍌欍€傞€氶亷鍑芥暩(sh霉)audio_init锛坴oid锛夊畬鎴愪互涓嬪叿楂斿姛鑳斤細 S3C2410鎺у埗绔彛锛圙PBl-GPB3锛夌殑鍒濆鍖�锛� 鐐鸿ō(sh猫)鍌欏垎閰岲MA閫氶亾锛� UDAl34l鐨勫垵濮嬪寲锛� 娉ㄥ唺audio瑷�(sh猫)鍌欏拰mixer瑷�(sh猫)鍌�銆� 鎵撻枊瑷�(sh猫)鍌欑敱鎵撻枊鍑芥暩(sh霉)open锛堬級瀹屾垚浠ヤ笅 鍔熻兘锛� 瑷�(sh猫)缃ソ鈪鍜孡3绺界窔锛� 婧�(zh菙n)鍌欏ソ鑱查亾銆侀噰妯ｅ搴︾瓑鍙冩暩(sh霉)骞堕€氱煡瑷�(sh猫)鍌�锛� 鏍规摎(j霉)閲囨ǎ鍙冩暩(sh霉)瑷�(j矛)绠楀嚭绶╂矕鍗€(q奴)澶�?銆�? 鍒嗛厤鐩告噳(y墨ng)澶у皬鐨凞MA绶╂矕鍗€(q奴)渚涜ō(sh猫)鍌欎娇鐢�銆� 4.2 DSP椹�(q奴)鍕曠殑瀵�(sh铆)鐝�(xi脿n) DSP椹�(q奴)鍕曞(sh铆)鐝�(xi脿n)浜嗛煶闋绘暩(sh霉)鎿�(j霉)鐨勫偝杓稿嵆鎾斁鍜岄寗闊崇殑鏁�(sh霉)鎿�(j霉)鍌宠几銆傚悓鏅�(sh铆)鎻愪緵ioctl灏峌DA134l涓殑DAC鍜孉DC閲囨ǎ鐜囬€�(j矛n)琛屾帶鍒躲€傞噰妯ｇ巼鐨勬帶鍒朵富瑕佹槸璁€瀵玌DAl34l鍏�(n猫i)鐨勯噰妯ｇ巼鎺у埗瀵勫瓨鍣�锛屾墍浠ラ﹨(q奴)鍕曠殑涓昏閮ㄥ垎灏辨槸鎺у埗闊抽牷鏁�(sh霉)鎿�(j霉)鐨勫偝杓�銆� 椹�(q奴)鍕曚腑閫氶亷绲�(ji茅)妲�(g貌u)static audio_state渚嗘弿杩版暣鍊�(g猫)闊抽牷绯荤当(t菕ng)鐨勭媭鎱�(t脿i)锛屽叾涓渶涓昏鐨勬槸2鍊�(g猫)鏁�(sh霉)鎿�(j霉)娴佺祼(ji茅)妲�(g貌u)audio_in鍜宎udio_out銆傞€�2鍊�(g猫)鏁�(sh霉)鎿�(j霉)娴佺祼(ji茅)妲�(g貌u)鍒嗗垾鎻忚堪杓稿叆闊抽牷娴佸拰杓稿嚭闊抽牷娴佺殑淇℃伅銆傞€氶亷灏峚udio_in鍜宎udio_out鐨勬搷浣滃垎鍒ュ(sh铆)鐝�(xi脿n)闊抽牷鐨勮几鍏ュ拰杓稿嚭锛堥煶闋荤殑鎾斁鍜岄寗闊筹級锛屾湰椹�(q奴)鍕曠殑涓昏鍏�(n猫i)瀹规槸鏁�(sh霉)鎿�(j霉)娴佺祼(ji茅)妲�(g貌u)鐨勮ō(sh猫)瑷�(j矛)鍜屽(sh铆)鐝�(xi脿n)銆傝┎绲�(ji茅)妲�(g貌u)鎳�(y墨ng)瑭插寘鍚煶闋荤珐娌栧崁(q奴)鐨勪俊鎭€丏MA鐨勭浉闂�(gu膩n)淇℃伅銆佹墍鐢ㄥ埌鐨勪俊铏熼噺鍙奆IFO鐨勫叆鍙ｅ瘎瀛樺櫒鐨勫湴鍧€銆� 鐐轰簡鎻愰珮绯荤当(t菕ng)鐨勫悶鍚愰噺锛岀郴绲�(t菕ng)浣跨敤DMA鎶€琛�(sh霉)鐩存帴灏囬渶瑕佸洖鏀炬垨閷勫埗鐨勮伈闊冲瓨鏀惧湪鍏�(n猫i)鏍哥殑DMA绶╁瓨鍗€(q奴)涓�锛岀敱浜嶴3C2410鐨凞MA鎺у埗鍣ㄦ矑鏈夊収(n猫i)缃殑DMA瀛樺劜鍗€(q奴)鍩燂紝鍥犺€岄﹨(q奴)鍕曠▼搴忓繀闋堝湪鍏�(n猫i)瀛樺収(n猫i)鐐洪煶闋昏ō(sh猫)鍌欏垎閰岲MA绶╁瓨鍗€(q奴)銆傜珐娌栧崁(q奴)瑷�(sh猫)缃槸鍚﹀悎鐞嗛潪甯搁棞(gu膩n)閸点€備互write锛堬級鍑芥暩(sh霉)鐐轰緥锛屽洜?y脿n)姗愮簺l鏁�(sh霉)鎿�(j霉)閲忛€氬父杓冨ぇ锛岃€岀珐瀛樺お灏忓鏄撻€犳垚绶╁瓨婧㈠嚭锛屾墍浠ヨ閲囩敤杓冨ぇ鐨勭珐娌栧崁(q奴)銆傝€岃濉厖澶х殑绶╂矕鍗€(q奴)锛孋PU灏辫涓€娆¤檿鐞嗗ぇ閲忕殑鏁�(sh霉)鎿�(j霉)锛岄€欐ǎ铏曠悊鏁�(sh霉)鎿�(j霉)鏅�(sh铆)闁撹純闀�锛屽鏄撻€犳垚寤堕伈銆傜瓎鑰呴噰鐢ㄥ鍊�(g猫)绶╁瓨鐨勬(j墨)鍒�锛屽皣绶╂矕鍗€(q奴)鍒嗙偤澶氬€�(g猫)鏁�(sh霉)鎿�(j霉)娈点€傛暩(sh霉)鎿�(j霉)娈电殑鍊�(g猫)鏁�(sh霉)鍜屽ぇ灏忓垎鍒ュ湪鏁�(sh霉)鎿�(j霉)娴佺祼(ji茅)妲�(g貌u)涓寚瀹�銆傞€欐ǎ鎶婂ぇ鐨勬暩(sh霉)鎿�(j霉)娈靛垎鐐哄咕鍊�(g猫)灏忔铏曠悊锛屾瘡铏曠悊涓€灏忔鏁�(sh霉)鎿�(j霉)灏卞彲浠ラ€氶亷DMA鐧�(f膩)閫佸嚭鍘汇€俽ead鍑芥暩(sh霉)涔熸槸濡傛锛孌MA姣忕櫦(f膩)渚嗕竴灏忔鏁�(sh霉)鎿�(j霉)灏卞彲浠ヨ檿鐞嗭紝涓嶇敤绛夊埌澶х珐娌栧崁(q奴)閮藉～婊挎墠铏曠悊鏁�(sh霉)鎿�(j霉)銆傞€欓噷閭勬彁渚涗簡ioctl鎺ュ彛绲︿笂灞よ(di脿o)鐢紝閫欐ǎ涓婂堡鍙互鏍规摎(j霉)闊抽牷鏁�(sh霉)鎿�(j霉)鐨勭簿搴﹀嵆鏁�(sh霉)鎿�(j霉)娴侀噺渚嗚(di脿o)鏁寸珐娌栧崁(q奴)鏁�(sh霉)鎿�(j霉)娈电殑澶у皬鍜屽€�(g猫)鏁�(sh霉)锛屼互鍙栧緱鏈€濂界殑鍌宠几鏁堟灉銆� 4.3 MIXER椹�(q奴)鍕曠殑瀵�(sh铆)鐝�(xi脿n) MIXER椹�(q奴)鍕曞彧鎺у埗娣烽煶鏁堟灉锛屽苟涓嶅煼(zh铆)琛岃畝瀵搷浣滐紝鎵€浠IXER鐨勬枃浠舵搷浣滅祼(ji茅)妲�(g貌u)鍙(sh铆)鐝�(xi脿n)浜�1鍊�(g猫)ioctl瑾�(di脿o)鐢�锛屾彁渚涚郸涓婂堡瑷�(sh猫)缃瓹ODEC鐨勬贩闊虫晥鏋溿€傞﹨(q奴)鍕曚腑涓昏瀵�(sh铆)鐝�(xi脿n)浜�1鍊�(g猫)绲�(ji茅)妲�(g貌u)楂攕truct UDAl34l_codec銆傝┎绲�(ji茅)妲�(g貌u)楂旀弿杩颁簡CODEC鐨勫熀鏈俊鎭�锛屼富瑕佹槸瀵�(sh铆)鐝�(xi脿n)浜咰ODEC瀵勫瓨鍣ㄧ殑璁€瀵嚱鏁�(sh霉)鍜屾贩闊崇殑鎺у埗鍑芥暩(sh霉)銆侻IXER鏂囦欢鎿嶄綔绲�(ji茅)妲�(g貌u)涓殑ioctl灏辨槸瑾�(di脿o)鐢║-DAl341_codec涓殑娣烽煶鎺у埗鍑芥暩(sh霉)渚嗗(sh铆)鐝�(xi脿n)鐨�銆� 4.4 瑷�(sh猫)鍌欑殑鍗歌級 瑷�(sh猫)鍌欑殑鍗歌級鐢辨敞閵峰嚱鏁�(sh霉)close锛堬級渚嗗畬鎴�銆傛敞閵峰嚱鏁�(sh霉)浣跨敤娉ㄥ唺鏅�(sh铆)寰楀埌鐨勮ō(sh猫)鍌欒櫉锛屽悓鏅�(sh铆)閲嬫斁椹�(q奴)鍕曠▼搴忎娇鐢ㄧ殑鍚勭ó绯荤当(t菕ng)璩囨簮锛屽DMA鍜岀珐娌栧崁(q奴)绛�銆� 5 绲�(ji茅)鏉熻獮 鏈枃浠嬬垂浜嗗湪宓屽叆寮忕郴绲�(t菕ng)涓(g貌u)寤哄熀浜庘叀S绺界窔鐨勯煶闋荤郴绲�(t菕ng)锛屽(sh铆)鐝�(xi脿n)闊抽牷鐨勬挱鏀惧拰閷勯煶鐨勯噰闆�銆傚叿楂旇瑳杩颁簡鍩轰簬Samsung鍏徃S3C2410鍨嬪井铏曠悊鍣ㄧ殑CODEC纭欢閫ｆ帴鐨勫(sh铆)鐝�(xi脿n)鍙婂祵鍏ュ紡Linux涓嬮煶闋婚﹨(q奴)鍕曠殑瀵�(sh铆)鐝�(xi脿n)銆傝┎绯荤当(t菕ng)宸茬稉(j墨ng)鍦ㄥ熀浜嶴3C2410鐨勯枊鐧�(f膩)骞宠嚭涓婂緱鍒颁簡瀵�(sh铆)鐝�(xi脿n)锛屽彲浠ラ爢鍒╅€�(j矛n)琛岄煶闋荤殑鎾斁鍜岄噰闆嗭紝骞跺彇寰楄壇濂界殑鏁堟灉銆�