mad-dev

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682 discussions

24 or 28 bit samples?
by Troy Watson 01 Nov '09

01 Nov '09

Hi all. Possibly a dumb question... MAD_F_FRACBITS is set to 28 by in mad.h; does that mean there are 28bits per sample in mad_synth.pcm.samples? I'm applying dither during the conversion to 16bit samples, and if I treat the samples as 24 bit I get terrible output, but if I treat them as 28 bit the audio sounds fine (with limited testing though).

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Detecting the last frame
by Troy Watson 12 Oct '09

12 Oct '09

Hi all, Is there a method to detect if the frame sent to mad_synth_frame is the last frame in the stream, without knowing in advance how many frames the input stream has? I am using libsamplerate and it requires the last block of audio data for a stream to set an end_of_input flag. Checking the EOF indicator for the input file is insufficient as that only informs me when the file has been fully buffered, not when the last frame has been synthesized. Any ideas or suggestions?

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madplay with alsa mode?
by Feng Ye 11 Oct '09

11 Oct '09

Hello there, I am having madplay compilation issue when using alsa mode (--with-alsa). All packages I used are the latest ones: - ALSA lib version is 1.0.21a - mad lib version 0.15.1b - id3tag lib version 0.15.1b - madplay version 0.15.2b The compilation errors are: audio_alsa.c:90: undefined reference to `snd_pcm_hw_params_set_rate_near(a)ALSA_0.9'<mailto:`snd_pcm_hw_params_set_rate_near@ALSA_0.9'> audio_alsa.c:100: undefined reference to `snd_pcm_hw_params_set_buffer_time_near(a)ALSA_0.9'<mailto:`snd_pcm_hw_params_set_buffer_time_near@ALSA_0.9'> ... Has anyone seen this? Thanks, Feng

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about FPM_INTEL / ASO_ZEROCHECK
by leon deng 10 Oct '09

10 Oct '09

Hi, guysHow is it going? when I build libmad in different platforms, i found two flags settings are different. I do not understand what those flags are used for, can any expert tell me about it? When i build libmad , i first ./configure, and then make. when I build it on 32 bits mac and 32 bits centOS, i have flags FPM_INTEL ASO_ZEROCHECK when I build it on 64 bits ubuntu and 64 bits centOS, I have flags FPM_DEFAULT In this case, Makefile do not have ASO_ZEROCHECK flag. i try to build libmad in my own program on those systems. i need to set the flags in my program. Any ideas about this? Another question is about : in libmad Makefile, there are lots of optimization flags. are those flags critical and should I also brought them all to my program? Thanks! Leon

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assert error happened when read one kind of mp3 file
by leon deng 06 Oct '09

06 Oct '09

Hi, guys. Hope you are doing good. When i use libmad decodes a mp3 file, and it gives me an assert in side layer3.c: 2633. layer3.c:2633: mad_layer_III: Assertion `stream->md_len + md_len - si.main_data_begin <= (511 + 2048 + 8)' failed. any ideas about this? Is libmad able to decode all kinds of mp3 files? Thanks! Leon

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compile libmad on AMD Dual core server errors
by leon deng 24 Sep '09

24 Sep '09

Hi, guys Hope everyone doing well! I am trying to compile libmad on ubuntu, which is run on AMD Dual core processor. I use gcc 4.3 I got some errors.One of the error is : libmad/fixed.h h:446:4:4 error: #error "no FPM selected" How to define FPM on AMD, is it intel processor specified? How to solve this issue? Thanks in advance! leon

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Precise volume control
by Nige 14 Aug '09

14 Aug '09

I am using the MAD low-level interface. I need to implement a volume control where the attenuation is specified in dB. Can anyone suggest a suitable algorithm, or better still tell me where I can find example code that does this? Thank you.

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答复: Re: does anybody make madplay play AAC?
by liu.yaojin＠zte.com.cn 12 Aug '09

12 Aug '09

hi: thanks for replying. i would like to let madplay work in embedded world.especially in arm linux :) Political Confusion <politicalconfusion(a)yahoo.com> 2009-08-12 14:35 收件人 liu.yaojin(a)zte.com.cn 抄送主题 Re: [mad-dev] does anybody make madplay play AAC? i haven't done this, but i would be interested in trying. what os (windows/linux/mac/?) are you using? i was thinking of building a simple player for windows using libavcodec and supporting asio-based audio drivers. -michael --- On Mon, 8/10/09, liu.yaojin(a)zte.com.cn <liu.yaojin(a)zte.com.cn> wrote: From: liu.yaojin(a)zte.com.cn <liu.yaojin(a)zte.com.cn> Subject: [mad-dev] does anybody make madplay play AAC? To: Date: Monday, August 10, 2009, 9:33 PM hi ,guys. i want to let madplay play aac files, has any one done this? how about develop together? -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system. -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system.

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does anybody make madplay play AAC?
by liu.yaojin＠zte.com.cn 11 Aug '09

11 Aug '09

hi ,guys. i want to let madplay play aac files, has any one done this? how about develop together? -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system.

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ARM9 with ALSA will only play via pipe
by rrsurfer1 04 Jul '09

04 Jul '09

Hi Guys, I build madplay for montavista 5.0 on an ARM9, specifically an OMAP-L137 EVM. I set configure to use alsa as the default device. I'm having trouble playing to the ALSA driver. If I run: ./madplay -v song.mp3 I get the ID3 info correct and then it stays at 00:00:00 and never plays... If I pipe the sound to aplay in wav format it works fine... any ideas for getting it to work straight from madplay? Any help is greatly appreciated! - Dominic -- View this message in context: http://www.nabble.com/ARM9-with-ALSA-will-only-play-via-pipe-tp24331425p243… Sent from the Mad - Dev mailing list archive at Nabble.com.

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