mad-dev August 2004

mad-dev@lists.mars.org

4 participants
5 discussions

mp3gain vs madplay
by Bruce Fitzsimons 15 Sep '04

15 Sep '04

Peoples, I'm about to launch into a debugging session to see why mp3gain (http://mp3gain.sourceforge.net/ ) and madplay 0.15.1b don't seem to be playing together (no pun intended). I thought I'd ask if anyone has used the two together yet, or if there is another linux-based replaygain processor (for adding replaygain to existing mp3s) that is more reliable. map3gain does appear to be adding a tag, as it finds it again if rerun over the same file. "# mp3gain /tmp/Abracadabra.mp3 /tmp/Abracadabra.mp3 Recommended "Track" dB change: -1.690000 Recommended "Track" mp3 gain change: -1 Max PCM sample at current gain: 28533.063680 Max mp3 global gain field: 180 Min mp3 global gain field: 116 Recommended "Album" dB change for all files: -7.490000 Recommended "Album" mp3 gain change for all files: -5" madplay doesn't appear to find it: "# madplay -G -Tv /tmp/Abracadabra.mp3 MPEG Audio Decoder 0.15.1 (beta) - Copyright (C) 2000-2004 Robert Leslie et al. Title: Abracadabra Artist: The Steve Miller Band Album: Golds Greatest Hits Track: 11 Year: 1982 Genre: Vocal Encoder Version: LAME 3.92 VBR Method: constant Bitrate: 255+ kbps Stereo Mode: normal Preset: none Unwise Settings: no Encoding Flags: Lowpass Filter: 19500 Hz ATH Type: 2 Noise Shaping: 1 Surround: none Start Delay: 576 samples End Padding: 1503 samples Source Rate: 44.1 kHz Music Length: 9948263 bytes Audio Frames: 11900" (note the missing "Replay Gain" printout I expect after reading the source) I'd hasten to add that I suspect mp3gain of doing something wrong, not madplay. I'm guessing the tag is wrong or in the wrong place. Any info would be appreciated, otherwise I'll report my findings to the list when I discover the root cause. /Bruce

5 8

question about left channel frequency information in stereo mode
by Shiming Dong 16 Aug '04

16 Aug '04

Hi there: I met with a new problem in the stereo mode: The two channels have different sound information and I only need to detect a tone with the specific frequency in the left channel. What changes shall I make for the following formula if I have two channels and each channel has 576 units pcm information. Thank you! shiming > 1. I use mad library to get the pcm data of a marker tone, each frame > contain 576 samples. I turned each 16 bits integer samples into floating > point by divided by 32768. And I put it into a floating point array > pcm[576]. > > 2. I tried to do fourier transformation to those pcm data: > Fk = sum (pcm[i] * cos(2*pi*k*i / N)) > > N = 576 > i: from 0 to N > k: from 0 to N / 2 > F[288]: is a floating point array > Thank you! shiming --------------------------------- Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage!

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[patch] add pkg-config support
by Eivind Magnus Hvidevold 07 Aug '04

07 Aug '04

Here is a patch for adding pkg-config support to libmad. It would make life a bit easier for distro maintainers if this was applied. In case you didn't know, pkg-config is a tool for providing LDFLAGS and CFLAGS for packages using shared libraries. It's on freedesktop.org. Debian has already been distributing the pkg-config file mad.pc with libmad for some time, and people developing on debian (notably xmms2 developers) have started relying on this support being present, causing some confusion for people installing from source and on some BSDs which do not provide mad.pc (google: pkgconfig libmad). EMH

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mp3 bitstream error
by Grigory A. 06 Aug '04

06 Aug '04

Hi! I am trying to play attached bitstream using mimimad application. and minimad say to me decoding error 0x0235 at byte offset 0 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */ but my winamp play it well. What is the problem? I attach only firs 16 kB of bitstream. in start of file there is a header of 0x240 bytes I "remove" it by simple seeking the file pointer. The problem is located in function int mad_layer_III(MAD_STREAM *stream, MAD_FRAME *frame) but where exactly here error = III_sideinfo(&stream->ptr, nch, header->flags & MAD_FLAG_LSF_EXT, &si, &data_bitlen, &priv_bitlen); or here - // -------- find main_data of this frame ----------- frame_space = stream->next_frame - mad_bit_nextbyte(&stream->ptr); ... I don't know. And one of possibilities is - wrong bitstream? but winamp play it well. So could some one help me understand what is the problem? -- Best regards, Grigory mailto:Ryhor@tut.by

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Re: MAD library for TI DSP
by Grigory A. 05 Aug '04

05 Aug '04

Hi loboWu! I've sent it to you from several e-mail accounts - but it didn't work - always same - fail to delivery So I try to do same from my yahoo.com e-mail and more http://dsp.neora.ru/cores/mp3.zip Grigory. Thursday, August 5, 2004, 2:28:30 PM, you wrote: l> Hi, Grigory: l> � l> � l> I am trying to port the MAD library for the TI-54X DSP,too l> And I try to implemnt it with Q1.15, but in vain. l> The output is so terrible with noise. l> � l> Could you please send me your implementation for reference ? l> � l> I will try my best for it, and put it on DM270 platform! l> � l> Thank you very much! l> � l> Lobo Wu,�� ITRI/CCL�� Taiwan -- Best regards, Grigory mailto:Ryhor@tut.by

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mad-dev August 2004