The mp3player from mrzhangf1ghter

👋 Hi, I’m @MrzhangF1ghter
👀 I’m interested in Embeded software&hardware
🌱 I’m currently learning lvgl
🚀 I’m currently working in drone field
📫 [email protected]

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mp3player's Issues

在全志F1C上执行时出现data abort 或者undefined instruction

data abort是地址未4字节对齐，但是我对齐后，又出现下边这个异常。调试发现是在mp3dec.c文件里函数IMDCT和Subband 会出现这个异常，请大佬指点一下是什么原因，查了几天也没找到原因

rt_kprintf("5\n");
		/* alias reduction, inverse MDCT, overlap-add, frequency inversion */
		for (ch = 0; ch < mp3DecInfo->nChans; ch++)
			if (IMDCT(mp3DecInfo, gr, ch) < 0) {
				MP3ClearBadFrame(mp3DecInfo, outbuf);
				return ERR_MP3_INVALID_IMDCT;			
			}

		/* subband transform - if stereo, interleaves pcm LRLRLR */
		if (Subband(mp3DecInfo, outbuf + gr*mp3DecInfo->nGranSamps*mp3DecInfo->nChans) < 0) {
			MP3ClearBadFrame(mp3DecInfo, outbuf);
			return ERR_MP3_INVALID_SUBBAND;			
		}
	}
	return ERR_MP3_NONE;
}

msh />mp3play -s ring.mp3
[D/mp3 player] EVENT:PLAYSTOPPAUSERESUME, STATE:STOPPED -> PLAYING
[D/I2S] channels:2,SUNXI_DA_TXCHMAP:76543210

[I/mp3 player] play start, uri=ring.mp3
[D/mp3 tag] current file pos:0
[D/mp3 tag] ring.mp3:751 KB,0.73 MB
[D/mp3 tag] mp3 data start at :0.000000 KB
[D/mp3 tag] sync word offset at:0
------------MP3 INFO------------
Title:
Artist:
Year:
Comment:
Genre:Blues
Length:00:48
Bitrate:128 kbit/s
Frequency:44100 Hz
--------------------------------
[D/mp3 player] 0x8110e9e0 0x81123490 2048
xx
zzz
aaa
bbb
1
2
3
4
5
Execption:
r00:0x00000000 r01:0x00000000 r02:0x00000000 r03:0x00000000
r04:0x8111a448 r05:0x00000000 r06:0xe92d40f0 r07:0x00000000
r08:0x00000000 r09:0x00000000 r10:0x00000000
fp :0x00000000 ip :0x00000000
sp :0x80000594 lr :0x800026ae pc :0x800026ae
cpsr:0x40000033
undefined instruction
thread - mp3_play stack:
         pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
charge    15  suspend 0x00000098 0x00000800    07%   0x00000013 OK
thread    16  ready   0x00000080 0x00001000    05%   0x00000014 ETIMOUT
serial    17  suspend 0x00000188 0x00001000    09%   0x00000014 OK
key       15  ready   0x000000a8 0x00000800    08%   0x00000014 ETIMOUT
usbd_rx    4  suspend 0x000000b0 0x00000800    08%   0x0000000a OK
usbd_tx    4  suspend 0x000000b0 0x00000800    08%   0x00000009 OK
tshell    20  ready   0x00000150 0x00001000    19%   0x00000006 OK
wav_p     15  suspend 0x00000110 0x00000800    13%   0x0000000a OK
mp3_play  15  running 0x00000140 0x00002000    09%   0x00000001 OK
mmcsd_de  22  suspend 0x000000b8 0x00000400    68%   0x00000009 OK
alarmsvc  10  suspend 0x00000098 0x00000800    07%   0x00000005 OK
sys work  23  suspend 0x00000070 0x00000800    05%   0x0000000a OK
tidle0    31  ready   0x00000060 0x00000100    46%   0x00000002 OK
timer      4  suspend 0x00000068 0x00000200    20%   0x00000009 OK
main      10  suspend 0x00000090 0x00000800    27%   0x00000004 OK
shutdown...

您好，请教您一个问题

由于之前没接触过RTT，请教您一个问题。看了一下RTT的框架，它有一套audio的driver，如果接入这一套就需要去实现audio的ops从而给应用层使用。但是该mp3player为啥没有用audio的接口，而去调用pcm的一套。也就是说如果我需要使用mp3player需要再挂载一套pcm的io驱动实现pcm_write/read是么？也不知道表达清楚没有，谢谢。

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