mad-user August 2004

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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Why too fast song tact by LibMad on RH9 Linux?
by Maxipoint Rep Office 17 Aug '04

17 Aug '04

Do you have a soundcard that will only play at 48KHz? RE: no, because same mp3s on windows play OK Or perhaps it's a MP3 recorded at 22KHz and you've opened the sound device at 44KHz. RE: no you can see in code that I am setRate (44100); all songs are recorded on the 192kbps 44.1kHz. Maybe I must define kbps too? -GP #include <sys/soundcard.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/ioctl.h> #include <fcntl.h> #include <errno.h> #include <unistd.h> #include "audio.h" #include <qstring.h> CAudioSink::CAudioSink () { // initialize device if ((sound_dev = open ("/dev/sound/dsp", O_WRONLY)) == -1) sound_dev = open ("/dev/dsp", O_WRONLY); if (sound_dev == -1) throw tr ("Failed to initialize OSS device"); if (ioctl (sound_dev, SNDCTL_DSP_SYNC, 0) == -1) throw tr ("Failed to sync with DSP"); // TODO: this must be moved to another method to handle mono data channels = 2; ioctl (sound_dev, SNDCTL_DSP_CHANNELS, &channels); ioctl (sound_dev, SNDCTL_DSP_SYNC, 0); int fmt = AFMT_S16_LE; // set 16-bit data in little-endian format ioctl (sound_dev, SNDCTL_DSP_SAMPLESIZE, &fmt); ioctl (sound_dev, SNDCTL_DSP_SYNC, 0); // set default playback rate setRate (44100); } CAudioSink::~CAudioSink () { close (sound_dev); } // set samplerate of data void CAudioSink::setRate (int _rate) { rate = _rate; ioctl (sound_dev, SNDCTL_DSP_SPEED, &rate); } // reset audio device void CAudioSink::flush () { ioctl (sound_dev, SNDCTL_DSP_RESET, 0); } // play data buffer void CAudioSink::play (unsigned char* ptr, int len) { while (len) { int wrote; wrote = write (sound_dev, ptr, len); // this check handles that fact that write syscall can be // interrupted at any time if (wrote == -1) { if (errno == EINTR) continue; else break; } ptr += wrote; len -= wrote; } }

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Why too fast song tact by LibMad on RH9 Linux?
by Maxipoint Rep Office 17 Aug '04

17 Aug '04

Why too fast song tact by LibMad on RH9 Linux? I am create own MP3 player with C++ and LibMad on the Linux. But song tact is to fast, all songs are faster with humoristic tone like on too fast vinil discs. Songs are min. 10% faster on LibMad and it is on ANY booster SO visible, and on small PC loudspeaker you must make more effort to hear, but when you know about that you can hear on small PC loudspeaker too Any help??

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mad-user August 2004