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682 discussions

Re: [mad-dev] madplay: How to select a specific ALSA card
by joker1999 19 Sep '08

19 Sep '08

Thomas Reitmayr-2 wrote: > > Hi, > I just started using madplay a short while ago and I was wondering > whether it is possible to select an ALSA card different from the default > one for audio output. >>From looking at the code it seems like the PATH part of --output is > used, however > madplay --output=alsa:plughw:1 myfile.mp3 > chokes as the TYPE alsa does not exist (in audio.c). > > Did I miss something in the command line or is this a bug / missing > feature (for which I could provide a patch)? > > Thanks, > -Thomas > > > You can try: madplay -o wave:- something.mp3 | aplay Regards -- View this message in context: http://www.nabble.com/madplay%3A-How-to-select-a-specific-ALSA-card-tp14695… Sent from the Mad - Dev mailing list archive at Nabble.com.

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Converting fixed point numbers
by Reiner 12 Jul '08

12 Jul '08

Hello, madplay uses the following in audio_linear_round /* quantize and scale */ return sample >> (MAD_F_FRACBITS + 1 - bits); if bits is 16 (unsigned short e,g) we will shift 13 bits, whats about the 3 MSB bits ??? With this I think only the first digit of the whole part is taken, what is with the sign and the other 2 digits from the whole part, are they never used? Thanks Reiner

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libmad documentation project
by Michelle Baert 09 Jun '08

09 Jun '08

Hi, I recently started working on a small audio processing project. I chose to use mad library for dealing with mp3 files. Since I needed to study it for getting enough understanding of it, and the package TODO file calls for contributors to documentation project, I tried to make my notes useful for the programmers community. One thing I like in java programming is the documentation facility, which generates browseable API documentation directly from comments inserted in source files. The same functionality is available for C/C++ and other languages, with Doxygen (open-source) program, so I decided to use it. You'll find all details and files here: http://m.baert.free.fr/contrib/docs/libmad/ Your comments and suggestions are welcome. TIA for them. -- Best regards, Michelle Baert

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madplayer cross-compile on ARM11 compilation error "impossible constraint in 'asm'"
by Jianfeng Li 21 May '08

21 May '08

Hi, All, I am now trying to cross-compile the madplayer on an arm11 based embedded system. The compiler I am using is from montavista mobilinux 5.0. When I tried to build the madplay, for the file resample.c, I got 2 errors on line 89 and 104. The error information is "impossible constraint in 'asm'. When I tried to build the libmad, I also met the same error. But it seems that during compilation if "FPM-ARM" option is enabled then the error is solved. But here I checked the Makefile, there is no such option of "FPM" as in the Makefile of libmad. So can anybody help to tell me why this error happens, it is due to the compiler's constraint/requirement? How should I try to solve this error? Is "trying to enable the FPM" a good option to try? Many thanks in advance! Regards, Jeffen _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx…

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Stream Decode
by Alexey V Paramonov 20 May '08

20 May '08

Hi! I have the following question - is it possible to decode a stream using MAD? For example: I have shoutcast stream and I read it in small portions (say, 40960 bytes), decode it and encode back to mp3 using LAME (chaning bitrate, samplerate, etc...). The problem is that I have to call mad_stream_buffer with each piece of stream data, decode/encode it and then if I listen the resulting mp3 file - I notice "noise" between theese small decoded pieces. Seems like it happen not only with VBR files. Pseudo-code: while ( bytes = read(file_id, buff, SHOUT_BUFFER_LENGTH ) ) { mad_stream_buffer(&stream, buff, bytes ); while(1){ mad_frame_decode(&frame,&stream) .... int ret = lame_encode_buffer( lameGlobalFlags, left, right, nsamples, mp3Buf, mp3Size ); // Play resulting mp3 data } } Is it possible to decode a stream without theese "edge effects" ? May be I should not re-initialize MAD buffer after each read in some way? Please help.

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Initite loop bug in libid3tag-0.15.0b
by Kentaro Oda 30 Jan '08

30 Jan '08

Hi, for the maintainer libid3tag. I found an infinite loop bug in libid3tag-0.15.0b library, which causes memory overflow. The problem occurs when parsing an ID3_FIELD_TYPE_STRINGLIST field, specifically when data to be parsed is ended with '\0'. In this case, **ptr == 0, but the condition end - *ptr is 1 so loop continues infinitely. *** field.c 2003-04-19 09:14:33.000000000 +0900 --- field-patched.c 2008-01-13 16:08:22.000000000 +0900 *************** *** 291,297 **** end = *ptr + length; ! while (end - *ptr > 0) { ucs4 = id3_parse_string(ptr, end - *ptr, *encoding, 0); if (ucs4 == 0) goto fail; --- 291,297 ---- end = *ptr + length; ! while (end - *ptr > 0 && **ptr != '\0') { ucs4 = id3_parse_string(ptr, end - *ptr, *encoding, 0); if (ucs4 == 0) goto fail; -- Kentaro Oda

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madplay: How to select a specific ALSA card
by Thomas Reitmayr 08 Jan '08

08 Jan '08

Hi, I just started using madplay a short while ago and I was wondering whether it is possible to select an ALSA card different from the default one for audio output. >From looking at the code it seems like the PATH part of --output is used, however madplay --output=alsa:plughw:1 myfile.mp3 chokes as the TYPE alsa does not exist (in audio.c). Did I miss something in the command line or is this a bug / missing feature (for which I could provide a patch)? Thanks, -Thomas

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memory leaking in mad_layer_III?
by Niels Roosen 27 Sep '07

27 Sep '07

Hello, In the past while I have been rounding up development for a streaming server for the radio station I am part of. However, during the last stress testing phase I noticed that memory usage slowly increases as streaming clients disconnect and connect. At first I was convinced it was some leak in my own code but valgrind didn't confirm that this was happening. However, I noticed that there was quite some lost memory originating in the mad_layer_III() function in layer3.c: ==5957== 7,701 bytes in 3 blocks are definitely lost in loss record 68 of 85 ==5957== at 0x481B72C: malloc (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so) ==5957== by 0x485F1C1: mad_layer_III (in /usr/lib/libmad.so.0.2.1) ==5957== by 0x485429A: mad_frame_decode (in /usr/lib/libmad.so.0.2.1) ==5957== by 0x7775: decode_data (server.c:318) ==5957== by 0x9387: server (server.c:980) ==5957== by 0x4874164: pthread_start_thread (in /lib/libpthread-0.10.so) ==5957== by 0x4A176E9: clone (in /lib/libc-2.3.6.so) ==5957== 13,824 bytes in 3 blocks are definitely lost in loss record 71 of 85 ==5957== at 0x481CE9E: calloc (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so) ==5957== by 0x485F215: mad_layer_III (in /usr/lib/libmad.so.0.2.1) ==5957== by 0x485429A: mad_frame_decode (in /usr/lib/libmad.so.0.2.1) ==5957== by 0x7775: decode_data (server.c:318) ==5957== by 0x9387: server (server.c:980) ==5957== by 0x4874164: pthread_start_thread (in /lib/libpthread-0.10.so) ==5957== by 0x4A176E9: clone (in /lib/libc-2.3.6.so) One would assume this is just caused by memory not being free()'d up when the program exits, but the longer the server has run, the more memory was definitely lost, indicating that the memory loss originates here. I use the mad library in such a way that I manually line up data and decode this data per frame, which is required to ensure certain functionality of the streaming server. I made sure that when I reinitialize the decoder every time I run the mad_*_finish() operations on all the structs I use before running mad_*_init() again. However, I suspect that not all allocated memory is freed as it should. Am I missing something or could it be that using mad this way hasn't been tested excessively enough and is it true that the memory alllocated in mad_layer_III() on lines 2530 and 2538 (libmad version 0.15.1b) is not freed properly? I would be delighted to either get confirmation on this or some advice on how to solve this issue. If more information is required I will do my best to provide this. Regards, Niels Roosen -- "One of the most frightening things about your true nerd, for many people, is not that he's socially inept - because everybody's been there - but rather his complete lack of embarrassment about it." - Randy Waterhouse in Cryptonomicon n: Arnie / Arnicus | e: niels(a)okkernoot.net w: http://okkernoot.net/ | irc: irc.okkernoot.net #geek | icq: 31817478 aim: arniea a arniea | msn: arnie(a)okkernoot.net http://jungletrain.net/ - 24/7 Drum and Bass Internet Radio

2 4

Calculation error
by Tim Dylla 07 Sep '07

07 Sep '07

Hi List, I did some testing on my own implementation of mp3, and used MAD as reference. Therefore I generated a sine-sweep from 0Hz to 22kHz ( as far as this is possible ;) ) at 0dBFS, and 48kHz Samplerate. Then I encoded it with Lame for a single Channel MPEG-1 Layer III Bitstream, 48kHz Samplerate, 320kbps Bitrate. (I don't know the exact Lame-version and optionstring anymore, but I didn't use anything weird) As expected, the resulting bitstream can be decoded without any obvious error with my Decoder and also with the dist10 decoder. MAD in contrast introduces a perceivable error right on the first half wave of the sine sweep. I think, it's an overflow in the requantization or the IMDCT (when I remember right, the huffman decoder produces very high output at this moment). I used MAD 0.15.2b in conjunction with MADFrontend on a 32bit-Windoze-machine. The option string was -b24 -d I'm not a friend of posting large files on a mailing list without any agreement with the moderator, so if someone is interested in the bitstream and the resulting raw file, pleas feel free to send me a message. With regards, Tim Dylla

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libMad Vs ffmpeg
by Chulwoong Jeon 24 Aug '07

24 Aug '07

I am porting MP3 at ARM9 platform. If I use only fixed-point(Integer), I wonder which one is faster between MAD mp3 decoding and ffmpeg mp3 decoding. CW

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