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: 07-27-2006 06:38 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 ====================================================================== ---------------------------------------------------------------------- Raymond - 07-27-06 06:36 ---------------------------------------------------------------------- /* Open PCM device for playback. */ rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0); if (rc < 0) { fprintf(stderr, "unable to open pcm device: %s\n", snd_strerror(rc)); exit(1); } /* Allocate a hardware parameters object. */ snd_pcm_hw_params_alloca(¶ms); /* Fill it in with default values. */ snd_pcm_hw_params_any(handle, params); /* Set the desired hardware parameters. */ /* Interleaved mode */ snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); /* Signed 16-bit little-endian format */ snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); /* Two channels (stereo) */ snd_pcm_hw_params_set_channels(handle, params, 2); /* 44100 bits/second sampling rate (CD quality) */ val = 44100; snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); /* Write the parameters to the driver */ rc = snd_pcm_hw_params(handle, params); if (rc < 0) { fprintf(stderr, "unable to set hw parameters: %s\n", snd_strerror(rc)); exit(1); } Hardware related parameters The ALSA PCM devices use the parameter refining system for hardware parameters - snd_pcm_hw_params_t. It means, that application choose the full-range of configurations at first and then application sets single parameters until all parameters are elementary (definite). Refer to the program in the article, Although the pcm state has been changed from SND_PCM_STATE_OPEN to SND_PCM_STATE_PREPARE according to http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html it has not set all parameters until all parameters become elementary (definite). In simple word, even pcm_state change to SND_PCM_STATE_PREPARE does not guarantee that all parameters are elementary (definite). This may be the cause of segfault AFAIK, there is no single method to make the remaining parameters (e.g. period_size, buffer_size, period, period_time and buffer_time) to become elementary (definite) for all existing ALSA drivers ---------------------------------------------------------------------- cruiseoveride - 07-27-06 06:38 ---------------------------------------------------------------------- Wow ray, u should join the ALSA team, they need people like you haha Looks like uve closed this thread with that post. i guess i didnt really start this post for that program haha , i only later came to realise that the audiophile driver was in bad shape. but anyways... im going to get a buddy of mine to check the wiring from the vt1724 to the DACs hopefully its the same as the Juli, but lets wait and see. and the other thing, do i need to do something in my devint to allow the card to work with other alsa cards, imean with the sequencer? as i wanted to build the driver on an incremental process. each time rebooting and loading the new version, but at the current state, i just copied and pasted the devinit from the phase22 and got a clean compile and added a few other things, just to see if the module loads cleanly but, i cant seem to have the ap192k and other cards loaded at the same time now? i guess i will figure this out myself again. but apart from that, this is about it for new ap192k.c code, and Yes rlrevell i know this is not the place for it but.... static unsigned char ap192k_eeprom[] __devinitdata = { 0x68, /* SYSCONF: 1xADC, 1xDACs */ 0x80, /* ACLINK: I2S */ 0xf8, /* I2S: vol, 96k and 192k, 24bit*/ 0xc3, /* SPDIF: out-en, out-int, spdif-in */ 0xFF, /* GPIO_DIR */ 0xFF, /* GPIO_DIR1 */ 0xFF, /* GPIO_DIR2 */ 0x00, /* GPIO_MASK */ 0x00, /* GPIO_MASK1 */ 0x00, /* GPIO_MASK2 */ 0x00, /* GPIO_STATE: */ 0x00, /* GPIO_STATE1: */ 0x00, /* GPIO_STATE2 */ }; 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 07-20-06 05:01 Raymond Note Edited: 0011107 07-20-06 08:05 cruiseoveride Note Added: 0011112 07-20-06 08:19 Raymond Note Added: 0011114 07-20-06 08:22 Raymond Note Edited: 0011114 07-20-06 10:49 Raymond Note Added: 0011116 07-20-06 15:52 cruiseoveride Note Added: 0011127 07-20-06 16:09 Raymond Note Added: 0011130 07-20-06 16:12 Raymond Note Added: 0011131 07-20-06 16:35 cruiseoveride Note Added: 0011132 07-20-06 16:39 cruiseoveride Note Edited: 0011132 07-20-06 17:42 cruiseoveride Note Added: 0011134 07-20-06 17:49 Raymond Note Added: 0011135 07-20-06 17:55 Raymond Note Edited: 0011135 07-20-06 19:30 Raymond Note Added: 0011136 07-20-06 19:31 Raymond Note Edited: 0011136 07-21-06 01:16 cruiseoveride Note Added: 0011138 07-21-06 01:28 cruiseoveride Note Added: 0011139 07-21-06 01:45 cruiseoveride Note Added: 0011140 07-21-06 03:28 Raymond Note Added: 0011141 07-21-06 20:23 cruiseoveride Note Added: 0011155 07-22-06 02:13 Raymond Note Added: 0011157 07-22-06 02:42 Raymond Note Edited: 0011157 07-22-06 02:53 Raymond Note Edited: 0011157 07-22-06 03:00 cruiseoveride Note Added: 0011161 07-22-06 03:01 cruiseoveride Note Edited: 0011161 07-22-06 04:12 Raymond Note Added: 0011164 07-22-06 04:15 Raymond Note Edited: 0011164 07-23-06 04:05 Raymond Note Added: 0011179 07-23-06 06:26 cruiseoveride Note Added: 0011181 07-23-06 06:41 Raymond Note Added: 0011182 07-23-06 06:46 Raymond Note Edited: 0011182 07-23-06 06:47 Raymond Note Edited: 0011182 07-23-06 06:52 Raymond Note Edited: 0011182 07-23-06 06:55 Raymond Note Edited: 0011182 07-23-06 13:05 Raymond Note Edited: 0011182 07-23-06 13:11 Raymond Note Edited: 0011182 07-23-06 13:17 Raymond Note Edited: 0011182 07-23-06 13:23 Raymond Note Edited: 0011182 07-23-06 14:16 Raymond Note Added: 0011187 07-23-06 14:20 Raymond Note Edited: 0011187 07-23-06 15:24 Raymond Note Edited: 0011187 07-23-06 17:23 rlrevell Note Added: 0011190 07-23-06 17:39 Raymond Note Added: 0011191 07-23-06 17:42 Raymond Note Edited: 0011191 07-23-06 17:49 cruiseoveride Note Added: 0011192 07-23-06 17:57 cruiseoveride Note Added: 0011193 07-23-06 18:03 rlrevell Note Added: 0011194 07-23-06 18:27 cruiseoveride Note Added: 0011195 07-23-06 18:30 cruiseoveride Note Edited: 0011195 07-23-06 18:33 cruiseoveride Note Edited: 0011195 07-24-06 02:15 Raymond Note Added: 0011206 07-24-06 02:27 Raymond Note Edited: 0011206 07-24-06 02:28 Raymond Note Edited: 0011206 07-24-06 07:12 Raymond Note Edited: 0011206 07-24-06 07:48 Raymond Note Edited: 0011206 07-25-06 18:02 Raymond Note Added: 0011230 07-26-06 00:19 cruiseoveride Note Added: 0011233 07-26-06 01:20 Raymond Note Added: 0011234 07-26-06 01:27 Raymond Note Edited: 0011234 07-26-06 01:31 Raymond Note Edited: 0011234 07-26-06 01:33 Raymond Note Edited: 0011234 07-26-06 04:30 cruiseoveride Note Added: 0011237 07-26-06 04:39 cruiseoveride File Added: 1724-envy24ht_nov2001.pdf 07-26-06 04:41 cruiseoveride Note Added: 0011238 07-26-06 04:47 Raymond Note Added: 0011239 07-26-06 04:53 Raymond Note Added: 0011240 07-26-06 05:17 Raymond Note Edited: 0011240 07-26-06 06:22 Raymond Note Added: 0011242 07-26-06 07:46 Raymond Note Added: 0011243 07-26-06 07:55 Raymond Note Edited: 0011243 07-26-06 15:42 cruiseoveride Note Added: 0011248 07-26-06 23:59 cruiseoveride Note Added: 0011251 07-27-06 00:15 cruiseoveride Note Added: 0011252 07-27-06 00:50 cruiseoveride Note Edited: 0011252 07-27-06 00:54 cruiseoveride Note Added: 0011253 07-27-06 00:54 cruiseoveride Note Edited: 0011253 07-27-06 00:57 rlrevell Note Added: 0011254 07-27-06 01:00 cruiseoveride Note Added: 0011255 07-27-06 01:03 rlrevell Note Added: 0011256 07-27-06 04:43 Raymond Note Added: 0011257 07-27-06 04:51 Raymond Note Edited: 0011257 07-27-06 06:25 Raymond Note Added: 0011258 07-27-06 06:28 Raymond Note Edited: 0011258 07-27-06 06:29 Raymond Note Edited: 0011258 07-27-06 06:36 Raymond Note Edited: 0011258 07-27-06 06:38 cruiseoveride Note Added: 0011259 ====================================================================== ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
