A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2287> ====================================================================== Reported By: cruiseoveride Assigned To: ====================================================================== Project: ALSA - lib Issue ID: 2287 Category: 0_general Reproducibility: always Severity: crash Priority: normal Status: new ====================================================================== Date Submitted: 07-16-2006 18:03 CEST Last Modified: 07-20-2006 04:22 CEST ====================================================================== Summary: Segfaults all functions after snd_pcm_hw_params_get_buffer_size (params,(snd_pcm_uframes_t *) & val); Description: I am new to Alsa and am not happy at all at the state of documentation available. You guys seriously need to do something about this. I have an M-Audio Audiophile Delta 192 (ICE1724) and I want to port envy24control for this chip, However I first need to familiar myself with the ALSA API. So I began by looking for simple examples on how to use ALSA API and came accross the followinf prog (Attached file test.c). The program compiles cleanly with gcc-4.1 and runs, however after it prints out the ..."buffer size = 8192 frames" It segfaults. If you slash out line 104, it resolves the issue. My question is, Is there a bug in this function? Code was obtained from http://www.linuxjournal.com/article/6735 ====================================================================== ---------------------------------------------------------------------- cruiseoveride - 07-19-06 17:43 ---------------------------------------------------------------------- thats great, only one problem I have no idea how to write a driver, but let see if ALSA will help. So help! the card is .. 05:07.0 Multimedia audio controller: VIA Technologies Inc. VT1720/24 [Envy24PT/HT] PCI Multi-Channel Audio Controller (rev 01) now we look at the VIA website,.. The Max sample rate on the card is 192KHz So this would make it more a 24HT than a 24PT, but the number of channels on the card would blend it with a 24MT too. So then...Acording to VIA this should have the following capabilities... 24HT ------------------------ Max Output Channels - 8 Max Input Channels - 4 24bit on either Analog or Digital I/O and 192Khz || the 24MT however matches the M-Audio Delta Audiophile 192 closest with the following 24MT (according to VIA) --- (according to physik) Max Output Channels - 2 --- (2x RCA OUT (Main Out L/R, Mon Out L/R) Max Input Channels - 2 ----- (1x RCA IN (In L/R) + 1x S/PDIF IN ) 24bit on either Analog or Digital I/O ----- (true) and 192Khz || ---- (true) So then wat do we do, is the linux pci ID incorrect? Ok lets believe its true and stick to a 24HT I have no idea wat ur talking about with the AKxx and the ADC/DAC So wat do WE do? I have enough C and C++ knowledge to write a driver however, i do not have to knowledge to hack an existing ALSA driver. I could write a new driver from scracth but I cant until the ALSA API is properly documented. So was to I do? ---------------------------------------------------------------------- Raymond - 07-20-06 04:22 ---------------------------------------------------------------------- You should find out the label of the "envy24xx" on the largest chip, the label of 48-pins ac97 chip if the chip use AC-link) or the label of the ADC/DAC (black ic) if the chip use I2S link) lspci -vn Your card should have different PCI Subsystem vendor id and device id You don't need to write from scratch, search the alsa-devel mailing archive and find out those topic about 'patch to add support for particular iec1724 card'. alsa-driver http://www.alsa-project.org/~iwai/writing-an-alsa-driver/index.html Issue History Date Modified Username Field Change ====================================================================== 07-16-06 18:03 cruiseoveride New Issue 07-16-06 18:03 cruiseoveride File Added: test.c 07-16-06 20:38 cruiseoveride Issue Monitored: cruiseoveride 07-17-06 02:44 Raymond Note Added: 0011032 07-17-06 02:47 Raymond Note Edited: 0011032 07-17-06 03:18 Raymond Note Edited: 0011032 07-17-06 05:45 cruiseoveride Note Added: 0011033 07-17-06 05:46 cruiseoveride Note Edited: 0011033 07-17-06 07:31 Raymond Note Added: 0011035 07-17-06 08:23 Raymond Note Added: 0011036 07-17-06 08:26 Raymond Note Edited: 0011036 07-17-06 14:48 cruiseoveride Note Added: 0011039 07-17-06 14:59 cruiseoveride Note Added: 0011040 07-17-06 16:07 Raymond Note Added: 0011042 07-17-06 16:31 Raymond Note Edited: 0011042 07-17-06 16:40 cruiseoveride Note Added: 0011044 07-17-06 17:13 cruiseoveride Note Added: 0011045 07-17-06 17:34 Raymond Note Added: 0011046 07-17-06 17:56 cruiseoveride Note Added: 0011047 07-18-06 07:44 Raymond Note Added: 0011053 07-18-06 14:21 cruiseoveride Note Added: 0011057 07-18-06 14:35 Raymond Note Added: 0011060 07-19-06 02:52 cruiseoveride Note Added: 0011075 07-19-06 03:27 Raymond Note Added: 0011076 07-19-06 06:21 Raymond Note Added: 0011080 07-19-06 17:43 cruiseoveride Note Added: 0011090 07-19-06 17:50 cruiseoveride File Added: chip.jpg 07-20-06 04:22 Raymond Note Added: 0011107 ====================================================================== ------------------------------------------------------------------------- Take Surveys. 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