mad-dev

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682 discussions

Speeding up audio books and podcasts
by Bill Cox 09 Jan '11

09 Jan '11

Hi, Jos. Thanks for writing daisy-player. It looks quite good to me. I find that a lot of vision impaired people like to speed up podcasts and audio books. This is a feature I would be happy to help add to daisy-player. I wrote a simple C library called sonic which can speed up or slow down speech with fairly low distortion. It's best attribute is low distortion at high speed up factors of 2X or more. It looks like I need to modify madplay, to enable speeding up of speech as an option, which should not be too hard. I'll post to their dev list to see if I the author is interested in including the capability. Bill

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compile MAD on snowleopard
by jschmidt＠folkwang-hochschule.de 04 Jan '11

04 Jan '11

Hi everybody, I would like to include MAD in an xcode project and I used the very simple minimad.c file. I also included the headers from the project trunk. But then I get an error: "_mad_decoder_finish", referenced from: _main in main.o during the linking. So I realized that I have to build the mad-lib first (right?) and I started the ./configure from console which went well but the make throws another error: (sed -e '1s|.*|/*|' -e '1b' -e '$s|.*| */|' -e '$b' \ -e 's/^.*/ *&/' ./COPYRIGHT; echo; \ echo "# ifdef __cplusplus"; \ echo 'extern "C" {'; \ echo "# endif"; echo; \ if [ ".-DFPM_INTEL" != "." ]; then \ echo ".-DFPM_INTEL" | sed -e 's|^\.-D|# define |'; echo; \ fi; \ sed -ne 's/^# *define *$HAVE_.*_ASM$.*/# define \1/p' \ config.h; echo; \ sed -ne 's/^# *define *OPT_$SPEED\|ACCURACY$.*/# define OPT_\1/p' \ config.h; echo; \ sed -ne 's/^# *define *$SIZEOF_.*$/# define \1/p' \ config.h; echo; \ for header in version.h fixed.h bit.h timer.h stream.h frame.h synth.h decoder.h; do \ echo; \ sed -n -f ./mad.h.sed ./$header; \ done; echo; \ echo "# ifdef __cplusplus"; \ echo '}'; \ echo "# endif") >mad.h make all-recursive if /bin/sh ./libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I. -DFPM_INTEL -DASO_ZEROCHECK -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 -fstrength-reduce -MT version.lo -MD -MP -MF ".deps/version.Tpo" -c -o version.lo version.c; \ then mv -f ".deps/version.Tpo" ".deps/version.Plo"; else rm -f ".deps/version.Tpo"; exit 1; fi mkdir .libs gcc -DHAVE_CONFIG_H -I. -I. -I. -DFPM_INTEL -DASO_ZEROCHECK -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 -fstrength-reduce -MT version.lo -MD -MP -MF .deps/version.Tpo -c version.c -fno-common -DPIC -o .libs/version.o cc1: warning: -f[no-]force-mem is nop and option will be removed in 4.3 version.c:1: error: CPU you selected does not support x86-64 instruction set version.c:1: error: CPU you selected does not support x86-64 instruction set make[2]: *** [version.lo] Error 1 make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2 This looks like the wrong architecture.. but I am not so familiar with the options in 'make'. Can anybody confirm the first case and does anyone have an idea for the make-problem? Thanks a lot in advance! Best Johannes

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madplay
by Neil Jones 22 Sep '10

22 Sep '10

Hi, Im trying to play mp3's on a new arch using madplay and alsa. If I pipe the output of madplay into alsa it works fine eg: madplay -R48000 -o wav:- file.mp3 | aplay -cc but if I invoke it directly: madplay - R48000 file.mp3 it sounds horrible, like its clipping and there lots of white/pinknoise mixed in. I have tried attenuating the output (-a -10) and check alasa-mixer settings that doesn't help. I also get the same effect when playing audio via mplayer (using libmad) I have no FPU so cant try mpg123 for instance. Any help or hints welcome. Cheers Neil

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Skipping and Rewinding to certain frames (Low Level API)
by Adam Magaluk 09 Jun '10

09 Jun '10

Hello Mad List, I am working on a project that uses libmad to decode mp3s, one requirement for the project is for rewinding or fast forwarding to a particular frame at any point in the playback. What is the preferred way to do that? Currently I set a variable when skipping forward that disables the write to output (which is libao). It works but I get a bunch of alsa underun errors (Not a libmad problem though). What bothers me more though is when I want to rewind I have to re-initialize the song and skip to the frame that is needed. That seems very inefficient to me. Is there a better way? Thanks for any advice, Adam Magaluk

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help
by 肖芳 08 Jun '10

08 Jun '10

hello : I want to use this libmad on FPGA to decode MP3,but I get the results of zeros ,I don't know why,please help me ! thank you ! xiao fang

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libmad and pkgconfig
by Александр Цамутали 20 Apr '10

20 Apr '10

Hi! I've sent this email today without subscribing first. It seems like it didn't reached list. So I subscribed and sent it again. Recently I packaged mpd for NixOS [1] and found one problem. mpd's configure uses pkgconfig to find libmad. There was no mad.pc in NixOS and I was surprised to find that Arch Linux, Gentoo and Debian patch libmad to install mad.pc. So I took patch from Arch Linux [2]. I think it would be good to add this patch to libmad sources, what do you think? [1] http://nixos.org [2] http://repos.archlinux.org/wsvn/packages/libmad/trunk/libmad.patch -- Александр Цамутали

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Submit a new patch for libmad decoder to support Atmel AVR UC3 architecture
by Mainchain, Stephane 17 Mar '10

17 Mar '10

Hello, I'd like to submit a patch for the Libmad MP3 decoder to support the Atmel AVR32 architecture (www.atmel.com/avr32). This patch has been hardly validated and is in the state to be released. Patch is available here: http://www.avrfreaks.net/index.php?module=Freaks%20Files&func=viewFile&id=3… Could anyone tell me what is the procedure for review? Kind Regards, Stephane Mainchain

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[libid3tag] saving both v1.1 and v2.3 tags
by Pascal Ognibene 02 Jan '10

02 Jan '10

Hi all, Sorry for the double-post - gmail has decided to send the mail before I was done :-( I want to tag existing, untagged mp3 files. Using the code below, I can save v1.1 id3 tags in the file, but I'm struggling to get v2.3.0 tags to be saved as well (I want both v1.1 and v2.3.0 in the same file). The code below will just save properly the first tag (ID3_FRAME_COMMENT), the second one seems to be ignored. Any help or code snippet would be welcome! Thank's, Pog --- Code snippet below: { struct id3_file *id3 = id3_file_open("/home/myself/foo.mp3", ID3_FILE_MODE_READWRITE); struct id3_tag *tag = id3_file_tag(id3); if (tag != NULL) { id3_tag_options(tag, ID3_TAG_OPTION_ID3V1, ~0); id3_tag_options(tag, ID3_TAG_OPTION_COMPRESSION, 0);//for ipod/itunes compatibility id3_tag_options(tag, ID3_TAG_OPTION_CRC, 0); id3_set_string(tag, ID3_FRAME_TITLE, "azertyuiopqdsfhjkklwxcéèàç@êôî", ID3_FIELD_TEXTENCODING_UTF_16); id3_set_string(tag, "TOWN", "SimplePod", ID3_FIELD_TEXTENCODING_UTF_16); } // update id3_file_update(id3); id3_file_close(id3); } // taken from the gtkpod code base void id3_set_string(struct id3_tag *tag, const char *frame_name, const char *data, enum id3_field_textencoding encoding) { int res; struct id3_frame *frame; union id3_field *field; id3_ucs4_t *ucs4; /* clear the frame, because of bug in libid3tag see http://www.mars.org/mailman/public/mad-dev/2004-October/001113.html */ while ((frame = id3_tag_findframe(tag, frame_name, 0))) { id3_tag_detachframe(tag, frame); id3_frame_delete(frame); } if ((data == NULL) || (strlen(data) == 0)) return; frame = id3_frame_new(frame_name); id3_tag_attachframe(tag, frame); /* Use the specified text encoding */ field = id3_frame_field(frame, 0); id3_field_settextencoding(field, encoding); if ((strcmp(frame_name, ID3_FRAME_COMMENT) == 0) || (strcmp(frame_name, "USLT") == 0)) { field = id3_frame_field(frame, 3); field->type = ID3_FIELD_TYPE_STRINGFULL; } else { field = id3_frame_field(frame, 1); field->type = ID3_FIELD_TYPE_STRINGLIST; } if (encoding == ID3_FIELD_TEXTENCODING_ISO_8859_1) { /* we read 'ISO_8859_1' to stand for 'any locale charset' -- most programs seem to work that way */ //always use utf-8, local encoding FIXME //id3_latin1_t *raw = charset_from_utf8(data); ucs4 = id3_latin1_ucs4duplicate(data); //g_free(raw); } else { /* Yeah! We use unicode encoding and won't have to worry about charsets */ ucs4 = id3_utf8_ucs4duplicate((id3_utf8_t *) data); } if ((strcmp(frame_name, ID3_FRAME_COMMENT) == 0) || (strcmp(frame_name, "USLT") == 0)) res = id3_field_setfullstring(field, ucs4); else res = id3_field_setstrings(field, 1, &ucs4); g_free(ucs4); if (res != 0) g_print(_("Error setting ID3 field: %s\n"), frame_name); }

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[libid3tag] saving both v1.1 and v2.3 tags
by Pascal Ognibene 02 Jan '10

02 Jan '10

Hi all, I want to tag existing, untagged mp3 files. Using the code below, I can save v1.1 id3 tags in the file, but I'm struggling to get v2.3.0 tags to be saved as well (at the s Any help or code snippet to

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MAD on Android
by collet.jb＠gmail.com 18 Nov '09

18 Nov '09

Hi, I'ma new developper in audio decoding and I'm working on a prototype for Android. Does anyone can explain me how I can compile libmad for android (ARM architecture) ? Thanks a lot.

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