mad-user August 2006

mad-user@lists.mars.org

2 participants
3 discussions

Where the hell is definition of struct id3_file????
by tj 29 Sep '06

29 Sep '06

In trying to learn how to use libid3, since there sems to be no documentatio. I am looking at soure trying to figure out how to use it. The first problem is the practically every call uses a pointer to a "struct id3_file" . Now, the problem is that there is no definition for id3_file structure in any .h file. I finally found it in file.c, a source file. How the hell are you supposed to use it in your app when the prototype is in a package source file? Seems that something is really broken here. tj

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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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mad-user August 2006