Nabble - MAD

Re: MAD on Android

2009-11-18T12:08:47Z

Hi,

I'm an Android developer and I happen to also be on the mad-dev list. I don't think this is really a question for mad-dev, but you should probably start here:

http://developer.android.com/sdk/ndk/1.5_r1/index.html

Android developer forums would be a better place to ask questions, at least until you get to the point where you can run simple examples under the Android NDK, but you're having specific problems with libmad.

Also, keep in mind that Android already has a media framework that can decode MP3 files, so you should ask yourself whether it makes sense to use libmad at all. Finally, note that there's no guarantee that future Android devices will run on ARM.

- Dominic

On Wed, Nov 18, 2009 at 7:56 AM, <collet.jb@...> wrote:

Hi,

I'm a 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.

From forum: Mad - Dev

MAD on Android

2009-11-18T07:56:54Z

Hi,

I'm a 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.

From forum: Mad - Dev

24 or 28 bit samples?

2009-11-01T01:41:25Z

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).

From forum: Mad - Dev

Libid3tag dependency on Zlib

2009-10-12T01:24:15Z

Hi,

Libid3tag library needs zlib for compilation. In my source tree zlib source is in let's say /zlib folder and the makefile looks as attached. There are potentially other applications using zlib so I can't configur the zlib makefile specifically for libid3tag

I know that by installing zlib to a particular directory and pointing libid3tag to that path I could get away with this. But I am not allowed to edit the makefile.

Could you suggets a way how libid3tag can use this zlib?

Regards
Kiran

Makefile (1K) Download Attachment

From forum: Mad - Dev

madplay with alsa mode?

2009-10-10T23:05:59Z

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@...

audio_alsa.c:100: undefined reference to `snd_pcm_hw_params_set_buffer_time_near@...

...

Has anyone seen this?

Thanks,

Feng

From forum: Mad - Dev

Re: about FPM_INTEL / ASO_ZEROCHECK

2009-10-10T10:58:56Z

On Oct 9, 2009, at 4:14 PM, leon deng wrote:

> 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.

Probably they should be the same for 64 bits (amd64) as for 32 bits
(i386).

FPM_INTEL means to use the x86 assembler instructions for fixed-point
multiplication. ASO_ZEROCHECK is an optimization that works well
under x86 so should be enabled by default.

You could try FPM_64BIT as an alternative. FPM_DEFAULT should be
avoided because it provides poor accuracy.

> 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?

The optimization flags were hand-picked because at the time they were
chosen they worked better than e.g. a simple -O2. They are only
useful when building libmad and are probably not necessary to
duplicate for the rest of your program.

--
Rob Leslie
rob@...

From forum: Mad - Dev

about FPM_INTEL / ASO_ZEROCHECK

2009-10-09T16:14:58Z

Hi, guys

How 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

From forum: Mad - Dev

assert error happened when read one kind of mp3 file

2009-10-06T13:15:41Z

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

From forum: Mad - Dev

Re: Question about madplay, libmad and libid3tag

2009-09-28T13:13:37Z

On Sep 27, 2009, at 6:52 PM, Kiran Biswal wrote:

> I am new user of MAD. I am trying to compile MAD on my platform
> (MIPS based). When I try to run the ./confogure from commandline it
> prompts me to point to the libmad and libid3tag which are in
> separate directories, so I give path to both libmad and libid3tag
> like below from the directory where madplay-0.15.2b is kept
>
> ./configure CPPFLAGS=-I/root/Music/audioplayer/libmad/libmad-0.15.1b
> CPPFLAGS=-I/root/Music/audioplayer/libid3tag/libid3tag-0.15.1b
> LDFLAGS=-L/root/Music/audioplayer/libmad/libmad-0.15.1b LDFLAGS=-L/
> root/Music/audioplayer/libid3tag/libid3tag-0.15.1b
>
> But it still complains that it can not find mad.h and I must first
> install libmad .
>
> Could you please tell me how to point to libmad and lib3tag at the
> same time?

The usual way to build and install is:

% cd libmad-0.15.1b
% ./configure
% make
# make install

% cd ../libid3tag-0.15.1b
% ./configure
% make
# make install

% cd ../madplay-0.15.2b
% ./configure
% make
# make install

(The order is important; you must install libmad and libid3tag before
configuring madplay.)

The default is to install under /usr/local, i.e. /usr/local/include
for header files, /usr/local/lib for shared library files, and /usr/
local/bin for executables.

If you want to install somewhere else (e.g. /opt/mad), you can do so
like this:

% cd libmad-0.15.1b
% ./configure --prefix=/opt/mad
% make
# make install

% cd ../libid3tag-0.15.1b
% ./configure --prefix=/opt/mad
% make
# make install

% cd ../madplay-0.15.2b
% ./configure --prefix=/opt/mad CPPFLAGS=-I/opt/mad/include
LDFLAGS=-L/opt/mad/lib
% make
# make install

--
Rob Leslie
rob@...

From forum: Mad - User

Re: Detecting the last frame

2009-09-28T12:41:19Z

On Sep 27, 2009, at 12:43 AM, Troy Watson wrote:
> 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?

You may need to decode the next frame before you output the previously
synth'ed one to be absolutely sure.

Keep in mind that when mad_frame_decode() (or mad_header_decode())
returns -1 and stream->error is MAD_ERROR_BUFLEN, and you are at EOF,
there may be one last frame you can decode by appending
MAD_BUFFER_GUARD zero bytes at the end of the buffer, but not
necessarily.

--
Rob Leslie
rob@...

From forum: Mad - Dev

Question about madplay, libmad and libid3tag

2009-09-27T18:52:27Z

Hi All ,

I am new user of MAD. I am trying to compile MAD on my platform (MIPS based). When I try to run the ./confogure from commandline it prompts me to point to the libmad and libid3tag which are in separate directories, so I give path to both libmad and libid3tag like below from the directory where madplay-0.15.2b is kept

./configure CPPFLAGS=-I/root/Music/audioplayer/libmad/libmad-0.15.1b CPPFLAGS=-I/root/Music/audioplayer/libid3tag/libid3tag-0.15.1b LDFLAGS=-L/root/Music/audioplayer/libmad/libmad-0.15.1b LDFLAGS=-L/root/Music/audioplayer/libid3tag/libid3tag-0.15.1b

But it still complains that it can not find mad.h and I must first install libmad .

Could you please tell me how to point to libmad and lib3tag at the same time?

Thanks in advance for the help

Regards

Kiran

From forum: Mad - User

Detecting the last frame

2009-09-27T00:43:42Z

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?

From forum: Mad - Dev

compile libmad on AMD Dual core server errors

2009-09-24T02:37:10Z

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

From forum: Mad - Dev

Precise volume control

2009-08-14T13:53:23Z

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.

From forum: Mad - Dev

答复: Re: does anybody make madplay play AAC?

2009-08-11T23:52:21Z

hi:
thanks for replying.
i would like to let madplay work in embedded world.especially in arm
linux :)

Political Confusion <politicalconfusion@...>
2009-08-12 14:35

收件人
liu.yaojin@...
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@... <liu.yaojin@...> wrote:

From: liu.yaojin@... <liu.yaojin@...>
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?

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From forum: Mad - Dev

does anybody make madplay play AAC?

2009-08-10T18:33:09Z

hi ,guys.
i want to let madplay play aac files, has any one done this?
how about develop together?

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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.

From forum: Mad - Dev

ARM9 with ALSA will only play via pipe

2009-07-03T22:07:55Z

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

From forum: Mad - Dev

ReplayGain in RVA2 frames

2009-05-24T10:45:22Z

Hello,

I noticed that Madplay supports ReplayGain, which is nice because
ReplayGain is a very useful idea. However, Madplay currently does
not read ReplayGain information from ID3v2 RVA2 frames. (Madplay does
read RVA2 frames, but doesn't look at the identification string which
distinguishes between track-gain and album-gain.)

This is unfortunate because it seems that, out of at least five
distinct methods for storing ReplayGain information, RVA2 is now
best supported among audio players.

I would like to make the following changes to the ReplayGain code
in madplay:

* Support ReplayGain from RVA2 frames in addition to RGAD frames.
This will improve compatibility with other audio players, making
ReplayGain much more usable.

* Remove the +6 dB pre-amplification thing.
The original ReplayGain standard specified normalize to 83 dB and
amplify +6 dB. But this was later revised into simply normalize
to 89 dB, which is how all current implementations are doing it.
The +6 dB could be left in place for LAME tags older than 3.95.1.

I am willing to write and test a patch that implements these changes.
Would you accept that patch?

Greetings,
Joris van Rantwijk.

From forum: Mad - Dev

How to get the accurate song time?

2009-05-06T12:14:45Z

Hi to all,

I neet to get the time of the song when it is playing. I am using the code below:

static
enum mad_flow header(void *data, struct mad_header const *header)
{
    mad_timer_add(&musicTimer, header->duration);
    return MAD_FLOW_CONTINUE;
}

long mp3_song_time(void)
{
    return mad_timer_count(musicTimer, MAD_UNITS_MILLISECONDS);
}

The code works, but it is not fast enough. I am getting the time with "mp3_song_time" faster than the header is called. (obs: I am using two processors, one to decode the song and the other to run the code that uses the song time).

Is there another way to get the right (more accurate) time?

Thanks in advance,

--
Carlos Henrique Gomes Correia
Game Programmer
Interama Games

Skype: carloshgcorreia
Tel: +55 27 3345 8525
Web: www.interama.net

From forum: Mad - Dev

Re: Maintaining libid3tag?

2009-04-02T10:14:51Z

On Apr 2, 2009, at 12:58 PM, Kurt Roeckx wrote:

> On Thu, Apr 02, 2009 at 09:44:18AM -0400, Andy Grundman wrote:
>> Is there any interest in having someone take over maintenance of
>> libid3tag? There are several patches floating around in various
>> places
>> [1] that should be rolled into an official release. There are also
>> some
>> issues related to handling of broken iTunes tags that I'd like to
>> fix and
>> don't see any patches for. I'm happy to volunteer.
>>
>> [1]
>> http://patch-tracking.debian.net/package/libid3tag
>
> Those are patches we added to the package, the difference between
> our version and upstream's version. And there hasn't been any
> activity upstream for a while.
>
> We really only have 1 open bug report:
> http://bugs.debian.org/350578
>
>> http://bugs.gentoo.org/show_bug.cgi?id=210564
>
> We have fixed this bug long before the gentoo bug report. This is
> http://bugs.debian.org/304913
> http://bugs.debian.org/480187

Yeah, it looks like Gentoo has the most complete set of patches.
However, there are a few issues with them:

http://sources.gentoo.org/viewcvs.py/gentoo-x86/media-libs/libid3tag/files/0.15.1b/

libid3tag-0.15.1b-compat.patch - This is a duplicate of
libid3tag-0.15.1b-unknown-encoding.patch
libid3tag-0.15.1b-fix_overflow.patch - This patch breaks reading of
UTF-16BE tags. The fix may be:

--- field.c.orig 2008-05-05 09:49:15.000000000 -0400
+++ field.c 2008-05-05 09:49:25.000000000 -0400
@@ -291,7 +291,7 @@

end = *ptr + length;

- while (end - *ptr > 0) {
+ while (end - *ptr > 0 && (*encoding ==
ID3_FIELD_TEXTENCODING_UTF_16BE || **ptr != '\0')) {
ucs4 = id3_parse_string(ptr, end - *ptr, *encoding, 0);
if (ucs4 == 0)
goto fail;

From forum: Mad - Dev

Re: Maintaining libid3tag?

2009-04-02T10:00:23Z

On Thu, Apr 02, 2009 at 06:58:22PM +0200, Kurt Roeckx wrote:

> On Thu, Apr 02, 2009 at 09:44:18AM -0400, Andy Grundman wrote:
> > Is there any interest in having someone take over maintenance of
> > libid3tag? There are several patches floating around in various places
> > [1] that should be rolled into an official release. There are also some
> > issues related to handling of broken iTunes tags that I'd like to fix and
> > don't see any patches for. I'm happy to volunteer.
> >
> > [1]
> > http://patch-tracking.debian.net/package/libid3tag
>
> Those are patches we added to the package, the difference between
> our version and upstream's version. And there hasn't been any
> activity upstream for a while.

I was under the impression that you've mailed the debian list
about this, and not the upstream list. Sorry about that.

Kurt

From forum: Mad - Dev

Re: Maintaining libid3tag?

2009-04-02T09:58:22Z

On Thu, Apr 02, 2009 at 09:44:18AM -0400, Andy Grundman wrote:
> Is there any interest in having someone take over maintenance of
> libid3tag? There are several patches floating around in various places
> [1] that should be rolled into an official release. There are also some
> issues related to handling of broken iTunes tags that I'd like to fix and
> don't see any patches for. I'm happy to volunteer.
>
> [1]
> http://patch-tracking.debian.net/package/libid3tag

Those are patches we added to the package, the difference between
our version and upstream's version. And there hasn't been any
activity upstream for a while.

We really only have 1 open bug report:
http://bugs.debian.org/350578

> http://bugs.gentoo.org/show_bug.cgi?id=210564

We have fixed this bug long before the gentoo bug report. This is
http://bugs.debian.org/304913
http://bugs.debian.org/480187

Kurt

From forum: Mad - Dev

Maintaining libid3tag?

2009-04-02T06:44:18Z

Is there any interest in having someone take over maintenance of
libid3tag? There are several patches floating around in various
places [1] that should be rolled into an official release. There are
also some issues related to handling of broken iTunes tags that I'd
like to fix and don't see any patches for. I'm happy to volunteer.

[1]
http://patch-tracking.debian.net/package/libid3tag
http://bugs.gentoo.org/show_bug.cgi?id=210564

--
Andy Grundman
Logitech Streaming Media Systems (Slim Devices)
andy@... / www.slimdevices.com

From forum: Mad - Dev

id3tag pkgconfig: -zf

2009-03-24T05:54:11Z

Hi there, I'm investigating an error when attempting to build sonic
visualiser 1.5 and we narrowed it down to the -zf option in the
pkgconfig. Is this a bug in libid3tag or in my distro?

This is the error at compiletime:

g++ -Wl,-O1 -Wl,-rpath,/usr/lib -o sonic-visualiser tmp_obj/main.o
tmp_obj/OSCHandler.o tmp_obj/MainWindow.o tmp_obj/PreferencesDialog.o
tmp_obj/moc_MainWindow.o tmp_obj/moc_PreferencesDialog.o
tmp_obj/qrc_sonic-visualiser.o -L../view -L../layer -L../data
-L../widgets -L../transform -L../plugin -L../base -L../system
-L../framework -L../audioio -L../rdf -L/usr/lib -lsvframework
-lsvaudioio -lsvview -lsvlayer -lsvrdf -lsvtransform -lsvwidgets
-lsvdata -lsvplugin -lsvbase -lsvsystem -lbz2
-L/home/hollunder/builds/vamp-plugin-sdk/pkg/usr/lib -lvamp-hostsdk
-loggz -lfishsound -lvorbisenc -lspeex -lvorbis -logg -lmad -zf
-lid3tag -lrubberband -lfftw3 -lfftw3f -lsndfile -lsamplerate -llrdf
-lrdf -lrasqal -lraptor -lportaudio -ljack -llo -Wl,-Bdynamic -lQtXml
-L/usr/lib -pthread -pthread -lQtGui -L/usr/X11R6/lib -pthread -lpng
-lfreetype -lgobject-2.0 -lSM -lICE -pthread -pthread -lXrender
-lfontconfig -lXext -lX11 -lQtNetwork -lssl -lcrypto -pthread -pthread
-lQtCore -lz -lm -pthread -lgthread-2.0 -lrt -lglib-2.0 -lpthread -ldl
g++: unrecognized option '-zf'

This is the pkgconfig file including the -zf

prefix=/usr
exec_prefix=/usr/bin
libdir=/usr/lib
includedir=/usr/include

Name: ID3TAG
Description: libid3tag - ID3 tag manipulation library
Version: 0.15.0b
Libs: -L${libdir} -lid3tag -zf
Cflags:

Thanks in advance for your help

From forum: Mad - User

About one application for decoder design

2009-01-22T00:06:08Z

Hi,all
How are you?
I found a source code for mp3 decorder using libmad library. It is called MADAudioFormatReader. if you do not know, it is not a big deal.
In this code, It can handle the stereo (2 channles )mp3 file, However, it can not handle single channel mp3 file.
What's the decorder difference between one channel and two channels mp3 file? I do not think there is a big difference. I think the key is
to know the structure in data chunks for both case and use the right function in MAD.
Am I right? Could you give me some clue?
I attach the file to this email for reference.
Best

Leon

[MADAudioFormat.cpp]

#include "stdafx.h" #include "MADAudioFormat.h" #define FPM_64BIT #define OPT_ACCURACY #include "mad.h" #define madFixedToIEEEfloat(mad) float(jlimit(double(-1.f), double(1.f), (mad * double(1.0 / (1 << MAD_F_FRACBITS))))) const int XING_FRAMES = 0x00000001L; const int XING_BYTES = 0x00000002L; const int XING_TOC = 0x00000004L; const int XING_SCALE = 0x00000008L; struct xing { long flags; unsigned long frames; unsigned long bytes; unsigned char toc[100]; long scale; }; class MADAudioFormatReader : public AudioFormatReader { public: MADAudioFormatReader(InputStream* const sourceStream) : AudioFormatReader(sourceStream, T("MPEG Audio Decoder (MAD)")) { usesFloatingPointData = true; sampleRate = 0; _streamStartPosition = 0; _samplesLeftInBuffer = 0; // Skip over ID3v2 tag (if there is one) { unsigned char tag_[10]; memset(&tag_, 0, sizeof(tag_)); int bytesRead = input->read(&tag_, sizeof(tag_)); if(bytesRead == sizeof(tag_) && tag_[0] == 'I' && tag_[1] == 'D' && tag_[2] == '3') { _streamStartPosition = sizeof(tag_); _streamStartPosition += (int(tag_[6]) << 21) | (int(tag_[7]) << 14) | (int(tag_[8]) << 7) | int(tag_[9]); } } input->setPosition(_streamStartPosition); mad_stream_init(&_madStream); mad_frame_init(&_madFrame); mad_synth_init(&_madSynth); if(scanHeader(&_madFrame.header, &_xing) != -1) { input->setPosition(_streamStartPosition); _streamSize = input->getTotalLength(); _madSynth.pcm.length = 0; _madCurTime = mad_timer_zero; if(_xing.flags & XING_FRAMES) { _madTimeLength = _madFrame.header.duration; mad_timer_multiply(&_madTimeLength, _xing.frames); } else { // Estimate playing time from file size mad_timer_set(&_madTimeLength, 0, 1, _madFrame.header.bitrate / 8); mad_timer_multiply(&_madTimeLength, (long)_streamSize); } sampleRate = _madFrame.header.samplerate; lengthInSamples = int64(double(mad_timer_count(_madTimeLength, MAD_UNITS_MILLISECONDS)) / 1000.f * double(sampleRate) + .5f); bitsPerSample = 16; numChannels = MAD_NCHANNELS(&_madFrame.header); input->setPosition(_streamStartPosition); } } ~MADAudioFormatReader() { mad_synth_finish(&_madSynth); mad_frame_finish(&_madFrame); mad_stream_finish(&_madStream); } bool read (int** destSamples, int64 startSampleInFile, int numSamples) { if(startSampleInFile >= lengthInSamples) return true; if(startSampleInFile + numSamples > lengthInSamples) numSamples = lengthInSamples - startSampleInFile; if(startSampleInFile != _lastSample) { if(seek(startSampleInFile)) _lastSample = startSampleInFile; else { lengthInSamples = _lastSample; return true; } } float *left = (float*)destSamples[0]; float *right = (float*)destSamples[1]; int numToRead_ = 0; while(numSamples > 0) { if(_samplesLeftInBuffer <= 0) { while(mad_frame_decode(&_madFrame, &_madStream) == -1) { if(MAD_RECOVERABLE(_madStream.error)) continue; int shift = 0; if(_madStream.next_frame) { shift = _madStream.bufend - _madStream.next_frame; memmove(_buffer, _madStream.next_frame, (size_t)shift); } int64 bytes = input->read(_buffer + shift, sizeof(_buffer) - shift); if(!bytes) { lengthInSamples = _lastSample; _madSynth.pcm.length = 0; _samplesLeftInBuffer = 0; return true; } mad_stream_buffer(&_madStream, _buffer, (long)(shift + bytes)); } mad_synth_frame(&_madSynth, &_madFrame); _samplesLeftInBuffer = _madSynth.pcm.length; _leftChannel = _madSynth.pcm.samples[0]; for (int k = 0;k < _madSynth.pcm.length;k++) _madSynth.pcm.samples[1][k] = 0; _rightChannel = _madSynth.pcm.samples[1]; mad_timer_add(&_madCurTime, _madFrame.header.duration); } numToRead_ = (_samplesLeftInBuffer <= numSamples) ? _samplesLeftInBuffer : numSamples; numSamples -= numToRead_; _samplesLeftInBuffer -= numToRead_; _lastSample += numToRead_; while (numToRead_--) { if(left) // (*left++) = madFixedToIEEEfloat(_madSynth.pcm.channels == 1 ? *_leftChannel : *_leftChannel++); (*left++) = madFixedToIEEEfloat(_madSynth.pcm.channels == 1 ? *_leftChannel++ : *_leftChannel++); if(right) //(*right++) = madFixedToIEEEfloat(_madSynth.pcm.channels == 1 ? *_leftChannel++ : *_rightChannel++); (*right++) = madFixedToIEEEfloat(_madSynth.pcm.channels == 1 ? *_rightChannel++: *_rightChannel++ ); } } return true; } private: bool seek(int64 sample) { if(!input) return false; int64 milliseconds_ = mad_timer_count(_madTimeLength, MAD_UNITS_MILLISECONDS); int64 currentMillisecond_ = int64(double(sample) / double(sampleRate) * 1000); double fraction_ = double(currentMillisecond_) / double(milliseconds_); mad_timer_set(&_madCurTime, currentMillisecond_, currentMillisecond_, MAD_UNITS_MILLISECONDS); if(_xing.flags & XING_TOC) { int percent_, p1_, p2_; percent_ = int(fraction_ * 100); p1_ = (percent_ < 100) ? _xing.toc[percent_ ] : 0x100; p2_ = (percent_ < 99) ? _xing.toc[percent_ + 1] : 0x100; fraction_ = (p1_ + (p2_ - p1_) * (fraction_ * 100 - percent_)) / 0x100; } int64 pos_ = int64(double(_streamSize) * fraction_); input->setPosition(pos_ ? pos_ : _streamStartPosition); int size = input->read(_buffer, sizeof(_buffer)); if(!size) { _madSynth.pcm.length = 0; _samplesLeftInBuffer = 0; return false; } mad_stream_buffer(&_madStream, _buffer, size); mad_frame_mute(&_madFrame); mad_synth_mute(&_madSynth); int skip_ = 2; do { if(!mad_frame_decode(&_madFrame, &_madStream)) { mad_timer_add(&_madCurTime, _madFrame.header.duration); if(!(--skip_)) mad_synth_frame(&_madSynth, &_madFrame); } else if(!MAD_RECOVERABLE(_madStream.error)) break; } while(skip_); _madSynth.pcm.length = 0; _samplesLeftInBuffer = 0; return true; } int parseXing(struct xing *xing, struct mad_bitptr ptr, unsigned int bitlen) { if (bitlen < 64 || mad_bit_read(&ptr, 32) != (('X' << 24) | ('i' << 16) | ('n' << 8) | 'g')) { xing->flags = 0; return -1; } xing->flags = mad_bit_read(&ptr, 32); bitlen -= 64; if (xing->flags & XING_FRAMES) { if (bitlen < 32) { xing->flags = 0; return -1; } xing->frames = mad_bit_read(&ptr, 32); bitlen -= 32; } if (xing->flags & XING_BYTES) { if (bitlen < 32) { xing->flags = 0; return -1; } xing->bytes = mad_bit_read(&ptr, 32); bitlen -= 32; } if (xing->flags & XING_TOC) { int i; if (bitlen < 800) { xing->flags = 0; return -1; } for (i = 0; i < 100; ++i) xing->toc[i] = (unsigned char) mad_bit_read(&ptr, 8); bitlen -= 800; } if (xing->flags & XING_SCALE) { if (bitlen < 32) { xing->flags = 0; return -1; } xing->scale = mad_bit_read(&ptr, 32); bitlen -= 32; } return 0; } int scanHeader(struct mad_header *header, struct xing *xing) { struct mad_stream stream; struct mad_frame frame; unsigned char buffer[8192]; unsigned int buflen = 0; int count = 0, result = 0; mad_stream_init(&stream); mad_frame_init(&frame); if (xing) xing->flags = 0; while(1) { if(buflen < sizeof(buffer)) { int64 bytes = input->read(buffer + buflen, sizeof(buffer) - buflen); if(!bytes) { result = -1; break; } buflen += int(bytes); } mad_stream_buffer(&stream, buffer, buflen); while(1) { if(mad_frame_decode(&frame, &stream) == -1) { if(!MAD_RECOVERABLE(stream.error)) break; continue; } if(count++ || (xing && parseXing(xing, stream.anc_ptr, stream.anc_bitlen) == 0)) break; } if (count || stream.error != MAD_ERROR_BUFLEN) break; memmove(buffer, stream.next_frame, (buflen = &buffer[buflen] - stream.next_frame)); } if(count) { if(header) *header = frame.header; } else result = -1; mad_frame_finish(&frame); mad_stream_finish(&stream); return result; } private: struct xing _xing; /* Xing VBR tag data */ struct mad_stream _madStream; /* MAD stream structure */ struct mad_frame _madFrame; /* MAD frame structure */ struct mad_synth _madSynth; /* MAD synth structure */ int _samplesLeftInBuffer; int64 _streamSize; int64 _lastSample; int64 _streamStartPosition; mad_fixed_t *_leftChannel; mad_fixed_t *_rightChannel; mad_timer_t _madCurTime; /* current playing time position */ mad_timer_t _madTimeLength; /* total playing time of current stream */ unsigned char _buffer[40000]; /* input stream buffer */ }; static const tchar* const extensions[] = { T(".mp3"), T(".mp2"), T(".mpg"), 0 }; MADAudioFormat::MADAudioFormat() : AudioFormat(T("MPEG Audio Decoder (MAD)"), (const tchar**) extensions) { } MADAudioFormat::~MADAudioFormat() { } bool MADAudioFormat::canHandleFile(const File& fileToTest) { return fileToTest.hasFileExtension(T("mp3")) || fileToTest.hasFileExtension(T("mp2")) || fileToTest.hasFileExtension(T("mpg")); } const Array<int> MADAudioFormat::getPossibleSampleRates() { const int rates[] = { 44100, 48000, 0 }; return Array <int>(rates); } const Array<int> MADAudioFormat::getPossibleBitDepths() { const int depths[] = { 16, 24, 32, 0 }; return Array<int> (depths); } bool MADAudioFormat::canDoStereo() { return true; } bool MADAudioFormat::canDoMono() { return true; } bool MADAudioFormat::isCompressed() { return true; } AudioFormatReader* MADAudioFormat::createReaderFor(InputStream* sourceStream, const bool deleteStreamIfOpeningFails) { AudioFormatReader* r = new MADAudioFormatReader(sourceStream); if (r->sampleRate == 0) if (!deleteStreamIfOpeningFails) delete r; return r; } AudioFormatWriter* MADAudioFormat::createWriterFor(OutputStream* streamToWriteTo, double sampleRateToUse, unsigned int numberOfChannels, int bitsPerSample, const StringPairArray& metadataValues, int qualityOptionIndex) { return 0; }

From forum: Mad - Dev

Re: About Xing VBR tag data

2009-01-13T22:23:07Z

On Jan 11, 2009, at 12:03 AM, leon deng wrote:

> I am new to MAD. I got confused about XING tag. Is XING also a mp3
> encoder? or XING is Tag in the mp3 format.
> If it is the later case, in the encoder side, we can put the size of
> the data in XING tag, and we can get the size of the file in XING
> tag in the decoder side. Because,
> we do not want to calculate the data size,and want to get the data
> size in XING tag.
>
> I also found XING is also a mp3 encoder on website.
>
> So could you tell me what the XING is ?

Xing was responsible for creating an encoder notable for its VBR tag,
which enables more accurate seeking within variable bitrate files.
Among other things, Xing's VBR tag contains information about the
total duration of an MP3 file, something that is not otherwise readily
available from the MPEG stream.

On Jan 13, 2009, at 11:18 AM, leon deng wrote:

> I want to find some mp3 headers, such as XING header,which can
> provide the duration information(total play time). I want to make
> use of it to achieve mp3 streaming support in libmad.
> So there are two questions.
> 1.I wrote a mp3 header reader, and it reads headers in the first 10
> frames. I only read first 4 bytes for each frame. where is XING
> duration field located, or could you provide some header
> documentation for XING header to me?
> 2. Could you please tell me some other headers which can provide
> duration information in it?

The Xing VBR tag, if present, is located within the ancillary data
portion of the first audio frame (unless the frame has CRC protection
enabled, in which case the tag is misplaced and overlaps the end of
the frame's audio data by two octets). You will find some code to
read the tag in the madplay distribution, within the files tag.c and
tag.h.

In general, MPEG audio streams only contain duration information about
each individual frame. If you know the total number of frames within
a file, you can calculate the total duration (assuming a constant
sample rate). Unfortunately, the total number of frames is difficult
to estimate in VBR files, and the only way to correctly calculate the
total duration -- absent a Xing tag or other source of metadata -- is
to scan every frame in the file.

--
Rob Leslie
rob@...

From forum: Mad - Dev

Re: How to achieve mp3 streaming using MAD?

2009-01-13T12:06:50Z

Hello Leon!

Am 13.01.2009, 20:18 Uhr, schrieb leon deng <pluginstarter@...>:

> Hi,all
> I want to find some mp3 headers, such as XING header,which can provide
> the
> duration information(total play time). I want to make use of it to
> achieve
> mp3 streaming support in libmad.
> So there are two questions.
> 1.I wrote a mp3 header reader, and it reads headers in the first 10
> frames.
> I only read first 4 bytes for each frame. where is XING duration field
> located, or could you provide some header documentation for XING header
> to
> me?
> 2. Could you please tell me some other headers which can provide duration
> information in it?

Follow this link:
http://www.hydrogenaudio.org/forums/lofiversion/index.php/t31277.html

> Best,
> Leon

Ciao Robert

From forum: Mad - Dev

How to achieve mp3 streaming using MAD?

2009-01-13T11:18:35Z

Hi,all
I want to find some mp3 headers, such as XING header,which can provide the duration information(total play time). I want to make use of it to achieve mp3 streaming support in libmad.
So there are two questions.
1.I wrote a mp3 header reader, and it reads headers in the first 10 frames. I only read first 4 bytes for each frame. where is XING duration field located, or could you provide some header documentation for XING header to me?
2. Could you please tell me some other headers which can provide duration information in it?

Best,
Leon

From forum: Mad - Dev

About Xing VBR tag data

2009-01-11T00:03:39Z

Hi ,all
I am new to MAD. I got confused about XING tag. Is XING also a mp3 encoder? or XING is Tag in the mp3 format.
If it is the later case, in the encoder side, we can put the size of the data in XING tag, and we can get the size of the file in XING tag in the decoder side. Because,
we do not want to calculate the data size,and want to get the data size in XING tag.

I also found XING is also a mp3 encoder on website.

So could you tell me what the XING is ?

From forum: Mad - Dev

playback/decoding problem

2008-12-02T00:05:21Z

Hello,

i have a problem with one stream that is not correct decoded by libmad. I use libmad-0.15.1b-r5 and mplayer with the following command line:

mplayer -ac mad http://gffstream.ic.llnwd.net/stream/gffstream_w19a

This is a mp3 radio stream and i get ugly noise and spikes. I can try another stream and it works very well. Can anyone tell me why this stream is not correct decoded. I have tried some other decoders
but its always the same problem.

Thanks,

Mathias

---

OUTPUT:

mplayer -ac mad http://gffstream.ic.llnwd.net/stream/gffstream_w19a

Connecting to server gffstream.ic.llnwd.net[87.248.219.36]: 80...
Cache size set to 320 KBytes
Cache fill: 15.00% (49152 bytes)
Audio only file format detected.
==========================================================================
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...

---

From forum: Mad - Dev

Playback issues

2008-10-26T13:00:03Z

Hi, I am trying to make a sound library for the Wii that uses libmad for
the mp3 decoding. However, I seem to have a problem, my code reports a
lot of lost sync errors when decoding the frames. Could someone please
take a look at my code and see if I am doing something obviously wrong?

You can find my code at svn://henke37.cjb.net/sound/ , the main file is
newMP3Player.cpp .

From forum: Mad - Dev

Madplay improved patch for alsa audio

2008-10-19T05:25:46Z

Hi,

Attached is an improved patch for alsa backend of madplay.
* fix allocation of buffer, buffer_size is number of frames
* use default 16 bit depth (some hardware has small buffers, 16/24 bit
difference is very small)

Regards,

Micha

--- madplay-0.15.2b/audio_alsa.c 2008-10-18 15:10:16.000000000 +0200
+++ madplay-0.15.2b/audio_alsa.c.new 2008-10-18 15:03:27.000000000 +0200
@@ -28,31 +28,30 @@

#include <errno.h>

-#define ALSA_PCM_OLD_HW_PARAMS_API
-#define ALSA_PCM_OLD_SW_PARAMS_API
#include <alsa/asoundlib.h>

#include <mad.h>

#include "audio.h"

-char *buf = NULL;
-int paused = 0;
+#define BUFFER_TIME_MAX 500000

-int rate = -1;
-int channels = -1;
-int bitdepth = -1;
-int sample_size = -1;
-
-int buffer_time = 500000;
-int period_time = 100000;
-char *defaultdev = "plughw:0,0";
+unsigned char *buf = NULL;
+int paused = 0;
+
+unsigned int rate = 0;
+unsigned int channels = -1;
+unsigned int bitdepth = -1;
+unsigned int sample_size = -1;
+
+unsigned int buffer_time;
+unsigned int period_time;
+char *defaultdev = "plughw:0,0";

snd_pcm_hw_params_t *alsa_hwparams;
snd_pcm_sw_params_t *alsa_swparams;

-snd_pcm_sframes_t buffer_size;
-snd_pcm_sframes_t period_size;
+snd_pcm_uframes_t buffer_size;

snd_pcm_format_t alsa_format = -1;
snd_pcm_access_t alsa_access = SND_PCM_ACCESS_MMAP_INTERLEAVED;
@@ -66,14 +65,20 @@
snd_pcm_hw_params_t *params,
snd_pcm_access_t access)
{
- int err, dir;
-
+ int err;
+
/* choose all parameters */
err = snd_pcm_hw_params_any(handle,params);
if (err < 0) {
printf("Access type not available for playback: %s\n", snd_strerror(err));
return err;
}
+ /* set the access type */
+ err = snd_pcm_hw_params_set_access(handle, params, alsa_access);
+ if (err < 0) {
+ printf("Sample format not available for playback: %s\n", snd_strerror(err));
+ return err;
+ }
/* set the sample format */
err = snd_pcm_hw_params_set_format(handle, params, alsa_format);
if (err < 0) {
@@ -87,29 +92,38 @@
return err;
}
/* set the stream rate */
- err = snd_pcm_hw_params_set_rate_near(handle, params, rate, 0);
+ err = snd_pcm_hw_params_set_rate(handle, params, rate, 0);
if (err < 0) {
printf("Rate %iHz not available for playback: %s\n", rate, snd_strerror(err));
return err;
}
- if (err != rate) {
- printf("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
- return -EINVAL;
- }
+ err = snd_pcm_hw_params_get_buffer_time_max(params, &buffer_time, NULL);
+ if (err < 0) {
+ printf("Unable to retrieve buffer time: %s\n", snd_strerror(err));
+ return err;
+ }
+ if (buffer_time > BUFFER_TIME_MAX)
+ buffer_time = BUFFER_TIME_MAX;
/* set buffer time */
- err = snd_pcm_hw_params_set_buffer_time_near(handle, params, buffer_time, &dir);
+ err = snd_pcm_hw_params_set_buffer_time_near(handle, params, &buffer_time, 0);
if (err < 0) {
printf("Unable to set buffer time %i for playback: %s\n", buffer_time, snd_strerror(err));
return err;
}
- buffer_size = snd_pcm_hw_params_get_buffer_size(params);
+ if (period_time * 4 > buffer_time)
+ period_time = buffer_time / 4;
/* set period time */
- err = snd_pcm_hw_params_set_period_time_near(handle, params, period_time, &dir);
+ err = snd_pcm_hw_params_set_period_time_near(handle, params, &period_time, NULL);
if (err < 0) {
printf("Unable to set period time %i for playback: %s\n", period_time, snd_strerror(err));
return err;
}
- period_size = snd_pcm_hw_params_get_period_size(params, &dir);
+ /* retrieve buffer size */
+ err = snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
+ if (err < 0) {
+ printf("Unable to retrieve buffer size: %s\n", snd_strerror(err));
+ return err;
+ }
/* write the parameters to device */
err = snd_pcm_hw_params(handle, params);
if (err < 0) {
@@ -123,6 +137,7 @@
int set_swparams(snd_pcm_t *handle,
snd_pcm_sw_params_t *params)
{
+ unsigned int start_threshold;
int err;

/* get current swparams */
@@ -136,13 +151,7 @@
if (err < 0) {
printf("Unable to set start threshold mode for playback: %s\n", snd_strerror(err));
return err;
- }
- /* allow transfer when at least period_size samples can be processed */
- err = snd_pcm_sw_params_set_avail_min(handle, params, period_size);
- if (err < 0) {
- printf("Unable to set avail min for playback: %s\n", snd_strerror(err));
- return err;
- }
+ }
/* align all transfers to 1 samples */
err = snd_pcm_sw_params_set_xfer_align(handle, params, 1);
if (err < 0) {
@@ -190,7 +199,7 @@
rate = config->speed;

if ( bitdepth == 0 )
- config->precision = bitdepth = 32;
+ config->precision = bitdepth = 16;

switch (bitdepth)
{
@@ -241,7 +250,7 @@
return -1;
}

- buf = malloc(buffer_size);
+ buf = malloc(buffer_size * sample_size);
if (buf == NULL) {
audio_error="unable to allocate output buffer table";
return -1;
@@ -279,7 +288,7 @@
int play(struct audio_play *play)
{
int err, len;
- char *ptr;
+ unsigned char *ptr;

ptr = buf;
len = play->nsamples;

From forum: Mad - Dev

libmad-0.15.1b does not compile on Fedora 9

2008-10-13T13:00:24Z

Hi,

[Posted this on mad-dev some days ago, got no answer...]

I've just installed a clean Fedora 9 distro, and I tried to compile
libmad-0.15.1b (which I had done fine previously, under Fedora 5),
I got the following error :

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 -fPIC -DPIC -o .libs/version.o
cc1: error: unrecognized command line option "-fforce-mem"
make[2]: *** [version.lo] Error 1

gcc version 4.3.0 does not have the "-fforce-mem" option... what can I do ?
is there a way (a configure option) to disable this ?

Thx,
Joao

--
Joao Moreira de Sa Coutinho
joao.moreira@...
Tel.: 08.70.23.48.29
Mob.: 06.28.90.83.67

From forum: Mad - User

libmad-0.15.1b does not compile on Fedora 9

2008-10-11T08:27:11Z

Hi,

I've just installed a clean Fedora 9 distro, and I tried to compile
libmad-0.15.1b (which I had done fine previously, under Fedora 5),
I got the following error :

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 -fPIC -DPIC -o .libs/version.o
cc1: error: unrecognized command line option "-fforce-mem"
make[2]: *** [version.lo] Error 1

gcc version 4.3.0 does not have the "-fforce-mem" option... what can I do ?
is there a way (a configure option) to disable this ?

Thx,
Joao

--
Joao Moreira de Sa Coutinho
joao.moreira@...
Tel.: 08.70.23.48.29
Mob.: 06.28.90.83.67

From forum: Mad - Dev

Re: madplay: How to select a specific ALSA card

2008-09-19T01:20:27Z

joker1999 wrote:

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

You may also need
mount /dev/sda1 -o remount,async,noatime
on nslu2 to get better usb transfer, so you won't experience hangs during playback.

Regards

From forum: Mad - Dev