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303 discussions

Gapless decoding with LAME tag reading
by Tobias Rundström 11 Aug '06

11 Aug '06

Hello List, I am trying to get our mad decoder in XMMS2 to playback LAME encoded files gapless by reading the decoder delay in the header, but I have some problems to get it working 100%. The test cases I have is confirmed playing gapless in foobar2000 so I guess I just doing something wrong :-) I parse the LAME tag with more or less the same code as in madplay.c and then I do: data->samples_to_skip = lame->start_delay; data->samples_to_skip_end = lame->end_padding; data->samples_to_play = (guint64)(((guint64)xmms_xing_get_frames (data->xing) * (guint64)1152) - (guint64)lame->start_delay); XMMS_DBG ("Samples to skip in the beginning: %d, total: %lld", data- >samples_to_skip, data->samples_to_play); These flags are then used in my decoding function which is attached at the bottom. Still I get around 1000 samples of silence in the beginning when I watch the output wave in a wave editor. My theories are that: 1) maybe MAD is adding silence to the output, I read something like hinted towards this on the interwebb somewhere. 2) that my find first sync code is not working properly. I feed the first frame (that I find the Xing/LAME tag in) back to the decoding routine found below, can that produce silence also? 3) My math is off somewhere :-) Any help on getting this play "perfect" gapless would be very appreciated! The full code is available here: http://git.xmms.se/? p=xmms2-devel.git;a=tree;;f=src/plugins/mad -- Tobias static gint xmms_mad_read (xmms_xform_t *xform, gpointer buf, gint len, xmms_error_t *err) { xmms_mad_data_t *data; xmms_samples16_t *out = (xmms_samples16_t *)buf; gint ret; gint j; gint read = 0; data = xmms_xform_private_data_get (xform); j = 0; while (read < len) { /* use already synthetized frame first */ if (data->synthpos < data->synth.pcm.length) { if (data->samples_to_skip <= 0 && data->samples_to_play >= 0) { out[j++] = scale_linear (data->synth.pcm.samples[0] [data->synthpos]); if (data->channels == 2) { out[j++] = scale_linear (data->synth.pcm.samples [1][data->synthpos]); read += 2 * xmms_sample_size_get (XMMS_SAMPLE_FORMAT_S16); data->samples_to_play -= 2; } else { read += xmms_sample_size_get (XMMS_SAMPLE_FORMAT_S16); data->samples_to_play --; } } else { if (data->channels == 2) { data->samples_to_skip -= 2; } else { data->samples_to_skip --; } } data->synthpos++; continue; } /* then try to decode another frame */ if (mad_frame_decode (&data->frame, &data->stream) != -1) { mad_synth_frame (&data->synth, &data->frame); data->synthpos = 0; continue; } /* if there is no frame to decode stream more data */ if (data->stream.next_frame) { guchar *buffer = data->buffer; const guchar *nf = data->stream.next_frame; memmove (data->buffer, data->stream.next_frame, data->buffer_length = (&buffer[data- >buffer_length] - nf)); } ret = xmms_xform_read (xform, (gchar *)data->buffer + data- >buffer_length, 4096 - data->buffer_length, err); if (ret <= 0) { return ret; } data->buffer_length += ret; mad_stream_buffer (&data->stream, data->buffer, data- >buffer_length); } return read; }

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Announce: MAD now included in the Comprehensive Source Database (CSDB)
by Enrico Weigelt 03 Aug '06

03 Aug '06

Hi folks, I'd like you to know that the MAD packages are now included in the comprehensive source database (CSDB): http://sourcefarm.metux.de/ regards, -- --------------------------------------------------------------------- Enrico Weigelt == metux IT service phone: +49 36207 519931 www: http://www.metux.de/ fax: +49 36207 519932 email: contact(a)metux.de cellphone: +49 174 7066481 --------------------------------------------------------------------- -- DSL ab 0 Euro. -- statische IP -- UUCP -- Hosting -- Webshops -- ---------------------------------------------------------------------

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reading from a from a given time
by tarek allaoua 26 Jul '06

26 Jul '06

Hi all, I want to know if the feature of reading an mp3 file from a given time is already implemented ? if not how hard would be to make it possible. Best regards. T

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Compiling madplay on arm-linux
by Shinta L. 17 Jul '06

17 Jul '06

Hi... I have problem compiling madplay for arm-linux.... I used the arm-linux-gcc 3.2.3, compiled the libmad and libid3tag successfully, but when i compile madplay, i received the following message: ----- compile message starts here ----- checking for id3_tag_parse in -lid3tag... no configure: error: libid3tag was not found *** You must first install libid3tag before you can build this package. *** If libid3tag is already installed, you may need to use the LDFLAGS *** environment variable to specify its installed location, e.g. -L<dir>. ----- compile message ends ----- i got the libid3tag.so.0 at the right folder but it still can't find the file.... If someone knows how to solve the problem, please give me some advise. Thanks. Regards, Shinta

2 1

Sample rate
by tarek allaoua 10 Jul '06

10 Jul '06

Hi, can mad decode mp3 files with samplerate other then 44.1 Khz or 22.05 Khz ? can any one explin me tis behaviour plz. Best regards. Tarek.

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compile error on linux
by Yamamoto Kazuko 09 Jun '06

09 Jun '06

I have problem in compiling madplay on linux(RedHat Linux7.3). I've found similar problem in this archive, but it didn't help. 1. I downloaded libid3tag-0.15.1b.tar.gz, libmad-0.15.1b.tar.gz, madplay-0.15.1b.tar.gz 2. I configured, maked and installed libid3tag and libmad, which were successful. I also confirmed that there are mad.h and id3tag.h under /usr/local/include. 3. I tried to make madplay, then I got following messages. -----compile messages starts here gcc -Wall -march=i486 -g -O2 -pg -pg -o madplay madplay.o getopt.o getopt1.o version.o resample.o filter.o tag.o crc.o player.o audio.o audio_aiff.o audio_cdda.o audio_hex.o audio_null.o audio_raw.o audio_snd.o audio_wave.o audio_esd.o audio_oss.o /usr/lib/libesd.so -L/usr/lib -laudiofile -lmad -lid3tag -lm resample.o: In function `resample_init': /home/kazu/mad/madplay-0.15.1b/resample.c:46: undefined reference to `mad_f_div' player.o: In function `show_id3': /home/kazu/mad/madplay-0.15.1b/player.c:644: undefined reference to `id3_frame_field' /home/kazu/mad/madplay-0.15.1b/player.c:678: undefined reference to `id3_frame_field' /home/kazu/mad/madplay-0.15.1b/player.c:684: undefined reference to `id3_frame_field' player.o: In function `process_id3': /home/kazu/mad/madplay-0.15.1b/player.c:1232: undefined reference to `id3_frame_field' /home/kazu/mad/madplay-0.15.1b/player.c:1278: undefined reference to `id3_frame_field' /home/kazu/mad/madplay-0.15.1b/player.c:1278: undefined reference to `id3_field_getlatin1' /home/kazu/mad/madplay-0.15.1b/player.c:1279: undefined reference to `id3_frame_field' /home/kazu/mad/madplay-0.15.1b/player.c:1342: undefined reference to `id3_frame_field' /usr/lib/libid3tag.a(util.o): In function `id3_util_compress': util.o(.text+0x12f): undefined reference to `compress2' /usr/lib/libid3tag.a(util.o): In function `id3_util_decompress': util.o(.text+0x196): undefined reference to `uncompress' collect2: ld returned 1 exit status make[2]: *** [madplay] エラー 1 make[2]: 出ますディレクトリ `/home/kazu/mad/madplay-0.15.1b' make[1]: *** [all-recursive] エラー 1 make[1]: 出ますディレクトリ `/home/kazu/mad/madplay-0.15.1b' make: *** [all] エラー 2 ----compile message end If someone know the solution, please give me advise. Thank you in advance, Kazu

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MAD/ARM archeology..
by john cooper 14 Apr '06

14 Apr '06

Hello, I've been lugging around a 0.13 version of libmad for about 5 years for use in a back burner project. I've ported the works to PPC about a year ago and just today to ARM. With 0.13 libmad there seems to be some really funky decode artifacts in libmad 0.13/ARM (but not in 0.15.1) which I couldn't explain. I noticed a few ARM-specific changes in fixed.h between 0.15.1 and 0.13 as well as what appear to be some tweaks called out in the CHANGES file. But the echo-like decode artifacts were so dramatic I can't believe they would have gone unnoticed nor unaddressed. I suppose it could be some odd build issue local to my work but that seems rather remote. Anyone encounter any similar issue specific to ARM in or around that vintage? Thanks, -john -- john.cooper(a)third-harmonic.com

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Stayalive Wrapper
by Matthew Rubenstein 19 Mar '06

19 Mar '06

I listen to a stream that plays data retrieved by curl piped to madplay, on my Inspiron8000's Ubuntu GNOME desktop: #!/bin/sh # Clean out old sessions. killall curl madplay sleep 2 # WWOZ.org stream curl http://wwoz-sc.streamguys.com:80 | madplay -Q - Every once in a while the curl process is interrupted by a network timeout. I want to put the script into a loop that tests the playback status, and restarts the pipeline if it's not playing. Any ideas? -- (C) Matthew Rubenstein

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Documentation
by MUNDOALEM.com 14 Mar '06

14 Mar '06

I'm starting to code with audio now. I'm trying to code a basic mp3 player just for studying purposes. I found libmad interesting to my purposes and would like to learn how to use it on my ANSI C programs. But I couldn't find any documentation of it. So if you could send me some links over the internet it would be pretty good!! Thank you very much you all. Egon Braun

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Suitability of use for Embedded Project
by Doug Allender 07 Mar '06

07 Mar '06

I am looking for source code for a no operating system, streamed audio receiver. I am told the stream is MPEG1 Layer2. Is the MAD source suitable for this? , and have people found this easy to port?

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