fix:mp3解码数据不正常

components/multimedia/luat_lib_multimedia.c

@@ -278,7 +278,7 @@ static int l_codec_get_audio_data(lua_State *L) {
 			{
 				result = mp3dec_decode_frame(coder->mp3_decoder, in_buff->addr + pos, in_buff->used - pos, out_buff->addr + out_buff->used, &info);
 //				LLOGD("result %u,%u,%u,%u", result, info.frame_bytes, pos, coder->mp3_decoder->reserv);
-				out_buff->used += (result * info.channels);
+				out_buff->used += (result * info.channels * 2);
 				if (result)
 				{
 					pos += info.frame_bytes;

demo/multimedia/Air105/main.lua

@@ -45,32 +45,35 @@ sys.taskInit(function()
     fatfs.mount("SD", 0, TF_CS, 24000000)
     local data, err = fatfs.getfree("SD")
     local buff = zbuff.create(1024)
-    local in_buff = zbuff.create(8 * 1024 + 512)
+    local in_buff = zbuff.create(2 * 1024 + 512)
     if data then
         log.info("fatfs", "getfree", json.encode(data))
         f = io.open("/sd/music/test1.mp3", "rb")
         if f then
             log.debug("find mp3")
-            data = f:read(8192)
+            data = f:read(2048)
             codecr = codec.create(codec.MP3)
             local result, AudioFormat, NumChannels, SampleRate, BitsPerSample, is_signed = codec.get_audio_info(codecr, data)
             if result then
-                buff:resize(SampleRate * 2)
+                buff:resize(65536)
                 in_buff:copy(nil, data)
                 result = codec.get_audio_data(codecr, in_buff, buff)
                 log.debug("start", audio.start(0, AudioFormat, NumChannels, SampleRate, BitsPerSample, is_signed))
                 audio.write(0, buff)
-                data = f:read(8192)
+                data = f:read(2048)
                 in_buff:copy(nil, data) 
                 result = codec.get_audio_data(codecr, in_buff, buff)
                 audio.write(0, buff)
-                data = f:read(8192)
+                data = f:read(2048)
+                buff:resize(1024)
                 while data and #data > 0 do
                     sys.waitUntil("moredata", 2000)
                     in_buff:copy(nil, data) 
+                    buff:resize(65536)
                     result = codec.get_audio_data(codecr, in_buff, buff)
                     audio.write(0, buff)
-                    data = f:read(8192)
+                    buff:resize(1024)
+                    data = f:read(2048)
                 end
                 sys.waitUntil("playover", 2000)    
                 codec.release(codecr)
@@ -83,6 +86,7 @@ sys.taskInit(function()
         data = nil
         f = io.open("/sd/music/test.wav", "rb")
         if f then
+            buff:resize(1024)
             buff:seek(0, zbuff.SEEK_SET)
             buff:copy(0, f:read(12))
             if buff:query(0, 4) == 'RIFF' and buff:query(8, 4) == 'WAVE' then