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682 discussions

libid3tag
by cab 16 Jun '07

16 Jun '07

Hello, Ok I'm here to report a few bugs with libid3tag The function id3_file_open works half the time file=id3_file_open(input,ID3_FILE_MODE_READONLY); if (file==NULL) { printf("file error(id3_tag_size fun)\n"); return 1; } this line often return 1 and prints file error each time I execute this command, I check the file path and it's correct so I concluded that the bug was coming from this function. Thanks. Best Regards Cab

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seeking error
by www.bigcab＠free.fr 08 Jun '07

08 Jun '07

rob wrote : Sadeesh Kumar wrote: > In libmad, when the song is playing, how can i jump to different > differnt location and start to play from that location?. I find it, there is > no direct easy interface to do this. To jump to a new location using the low-level API: 1. Seek to an approximate location in the file and load your buffer with data from the new position. 2. Call mad_stream_buffer() to update the stream pointers for the modified buffer. 3. Call mad_frame_mute() and mad_synth_mute(). At this point you can simply resume decoding. However, to avoid any unpleasant burps in the audio, unless you have seeked to the very beginning of the file, it is best to: 4. Call mad_frame_decode() successfully at least twice. Note that the first few calls will probably yield recoverable decoding errors which you can safely ignore. 5. Call mad_synth_frame() once and discard the resulting PCM. The MAD plug-in for Winamp does all of this if you're looking for an example. Cheers, -rob but the problem is I've got these errors decoding error 0x0101 (lost synchronization) at byte offset 4096 decoding error 0x0235 (bad main_data_begin pointer) at byte offset 4203 and then my player doesn't work any more, there's a bug what is wrong ? here my source code int seek(state*status /*structure to store the data*/,int value) { printf("seeking in mp3 started\n"); struct mad_stream *stream; stream=status->stream; struct mad_frame frame; frame=status->mad_frame; struct mad_synth synth; synth=status->synth; printf("%lf is the value in percent\n",value); pthread_mutex_lock(&mutex); int seek_bit; int bitrate=status->bitrate; int samplerate=status->srate; int frame_size=144*bitrate/samplerate; seek_bit=percent_to_bits(status->mp3_file_size,(int)value); int reste=seek_bit-status->cur_bit; int factor=reste/frame_size; seek_bit=status->cur_bit+factor*frame_size+4*factor; printf("mad stream buffer call\n"); mad_stream_buffer(stream,status->start_mp3+seek_bit,status->mp3_file_size-seek_bit); status->cur_bit=seek_bit; mad_frame_mute(&frame); mad_synth_mute(&synth); int result,i=0; result=mad_frame_decode(&frame,stream); while((result!=0)||(i<2)) { result=mad_frame_decode(&frame,stream); i+=1; } mad_synth_frame(&synth,&frame); pthread_mutex_unlock(&mutex); printf("seeking in mp3 ended\n"); return 0; } what is wrong with my source code?

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MAD_ERROR_BADHUFFDATA before MAD_ERROR_BUFLEN
by Radek Bartoň 22 May '07

22 May '07

Hello. I tried to incorporate Madlld low-level API demonstration code into my MP3 player, but I'm experiencing a weird problem. When data stored by mad_stream_buffer to MAD are going to run out MAD_ERROR_BADHUFFDATA is generated right before MAD_ERROR_BUFLEN. Then when new data are sent to MAD MAD_ERROR_BADCRC and MAD_ERROR_BADDATAPTR occur. Since then no other errors occur until next data are consumed. This produces slight skip in otherwise fluent playback. I checked twice that my code which I'm attaching is equivalent to Madlld's one. Please, if you'll notice a reasong of this behaviour in my code, let me know since I'm little desperate about this. Thank you. -- Bc. Radek Bartoň Faculty of Information Technology Brno University of Technology E-mail: xbarto33(a)stud.fit.vutbr.cz Web: http://blackhex.no-ip.org Jabber: blackhex(a)jabber.cz

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Question on New IMDCT Algorithm
by 岷兰王 09 Apr '07

09 Apr '07

Hi, I have been reading the new IMDCT algorithm in libmad-0.15.1b. I can understand how it works. But what I can't get how the "scale[]" array is produced. It seems not to be the same with other arrays in layer3.c, such as cs[], ca[], etc. Can any body help me on this question?? Thank you! --------------------------------- Mp3疯狂搜-新歌热歌高速下

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Re: mad-dev Digest, Vol 20, Issue 2
by Li xiaochao.Jeff 31 Mar '07

31 Mar '07

For algorithm, I think it is almost the best. But for implementation, there might be another optimization. Remember, the choice of algorithm is much dependent upon the hardware architecture. Regards, Li xiaochao.Jeff ----- Original Message ----- From: <mad-dev-request(a)lists.mars.org> To: <mad-dev(a)lists.mars.org> Sent: Friday, March 30, 2007 3:00 AM Subject: mad-dev Digest, Vol 20, Issue 2 > Send mad-dev mailing list submissions to > mad-dev(a)lists.mars.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.mars.org/bin/mailman/listinfo/mad-dev > or, via email, send a message with subject or body 'help' to > mad-dev-request(a)lists.mars.org > > You can reach the person managing the list at > mad-dev-owner(a)lists.mars.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of mad-dev digest..." > > > Today's Topics: > > 1. Synthesis filter bank in libmad (Karthika) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 29 Mar 2007 07:45:58 +0100 (BST) > From: Karthika <karthika_lakshmi(a)yahoo.co.in> > Subject: [mad-dev] Synthesis filter bank in libmad > To: MAD <mad-dev(a)lists.mars.org> > Message-ID: <333191.28381.qm(a)web7906.mail.in.yahoo.com> > Content-Type: text/plain; charset=iso-8859-1 > > Helloo, > I am trying to understand the synthesis filter > bank in the LIBMAD. I could not understand in what > order the D coefficients are used to obtain the PCM > samples. Also,half of these coefficients have some > relation to the other half. Then, why all the > coefficients are being used in D.dat file? What is the > significance of even and odd pointers? How is the > windowing operation between U vector and D vector > taking place? > > Also, I would like to know if we can further > optimize the LIBMAD source code. For e.g, by using > Cooley-Tukey algorithm for the calculation of > fastdct() and dct32() . Could anyone suggest any > further optimization techniques for porting LIBMAD on > an ARM processor? > > Any help will be greatly appreciated. > > Thanks and Regards, > Karthika Lakshmi. > > > > > > __________________________________________________________ > Yahoo! India Answers: Share what you know. Learn something new > http://in.answers.yahoo.com/ > > > End of mad-dev Digest, Vol 20, Issue 2 > ************************************** >

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Synthesis filter bank in libmad
by Karthika 29 Mar '07

29 Mar '07

Helloo, I am trying to understand the synthesis filter bank in the LIBMAD. I could not understand in what order the D coefficients are used to obtain the PCM samples. Also,half of these coefficients have some relation to the other half. Then, why all the coefficients are being used in D.dat file? What is the significance of even and odd pointers? How is the windowing operation between U vector and D vector taking place? Also, I would like to know if we can further optimize the LIBMAD source code. For e.g, by using Cooley-Tukey algorithm for the calculation of fastdct() and dct32() . Could anyone suggest any further optimization techniques for porting LIBMAD on an ARM processor? Any help will be greatly appreciated. Thanks and Regards, Karthika Lakshmi. __________________________________________________________ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/

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[SOS]:MDCT values in madlib
by shiyuanyuan 01 Mar '07

01 Mar '07

2 1

how to play cdr file decoded by madlld
by Gang-Ryung Uh 04 Feb '07

04 Feb '07

We installed madlld and decode sample mp3 file into cdr extension. Could you advise us how to play that cdr file on cygwin with window XP? Thanks, __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

1 1

ressources needed
by zelos 414 26 Jan '07

26 Jan '07

Hello, I'm interested in making a mp3 mplayer in c++ with MAD. I was using FMOD which supports much more formats(Ogg, mod, etc) but it is not GPL! Do you know where I can find a doc about MAD API ? I can't even find one!? Thanks a lot. Zelos

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madplay application in uClinux distribution
by Paraskevi D. Kyritsi 19 Jan '07

19 Jan '07

My name is Paraskeyh Kyritsi and I have downloaded madplay-0.15.2b with the libmad-0.15.1b and libid3tag-0.15.1b. I have built all the above in a uClinux distribution kernel version 2.4.x using arm-elf tools. The produced image is being downloaded in a sdram memory and is being played by an arm9 microprocessor with audio output in a Teak DSP core. There seems to be no problem with the debug of the code but...I can't hear the mp3 file being played. I have some debug messages like the below ones: ################################################################### # madplay /storage/moby-flowe210907_8k16b.mp3 DSP ioctl: DSP_PREPARE 20 20 DSP codec internal MPEG Audio Decoder 0.15.2 (beta) - Copyright (C) 2000-2004 Robert Leslie et al. We are in the player_run function argc=1 argv[0]=/storage/moby-flowe210907_8k16b.mp3 Initialize audio run the player Run PlayList!!!! is result 0? yes!!! here we are in ---->result = play_all(player) playlist_entry=/storage/moby-flowe210907_8k16b.mp3 Fail reading ID3 tag information result=-1 frames decoded1 3780247555 finish up ######################################################### Well, it's rather difficult situation. I hope there is someone who can test something similar to help me. Regards, Paraskeyh Kyritsi

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