On Tue, Jul 22, 2003 at 03:51:58PM +0200, Carlo Wood wrote:
> int err = snd_pcm_mmap_begin(handle, &areas, &offset, &frames);
>
> returns err == 0, but results in areas == NULL ?
I looked deeper into it, and it happens because
snd_pcm_mmap_begin returns snd_pcm_mmap_areas()
which returns pcm->running_areas:
314 static inline const snd_pcm_channel_area_t *snd_pcm_mmap_areas(snd_pcm_t *pcm)
315 {
316 if (pcm->stopped_areas &&
317 snd_pcm_state(pcm) != SND_PCM_STATE_RUNNING)
318 return pcm->stopped_areas;
319 return pcm->running_areas;
320 }
where
(gdb) p *pcm
$6 = {dl_handle = 0x40016670, name = 0x81a5088 "emu10k1", type = SND_PCM_TYPE_HW,
stream = SND_PCM_STREAM_CAPTURE,
mode = 0, poll_fd = 9, poll_events = 1, setup = 1, access =
SND_PCM_ACCESS_RW_INTERLEAVED,
format = SND_PCM_FORMAT_S16_LE, subformat = SND_PCM_SUBFORMAT_STD, channels = 1,
rate = 22050, period_size = 384,
period_time = 17414, periods = {min = 0, max = 0, openmin = 0, openmax = 0, integer
= 0, empty = 0}, tick_time = 1000,
tstamp_mode = SND_PCM_TSTAMP_NONE, period_step = 1, sleep_min = 0, avail_min = 384,
start_threshold = 1,
stop_threshold = 768, silence_threshold = 0, silence_size = 0, xfer_align = 384,
boundary = 1610612736, info = 65795,
msbits = 16, rate_num = 22050, rate_den = 1, fifo_size = 0, buffer_size = 768,
buffer_time = {min = 0, max = 0,
openmin = 0, openmax = 0, integer = 0, empty = 0}, sample_bits = 16, frame_bits =
16, appl = {master = 0x0,
ptr = 0x4001b000, fd = 9, offset = -2130706432, link_dst_count = 0, link_dst =
0x0, private_data = 0x0, changed = 0},
hw = {master = 0x0, ptr = 0x40018008, fd = 9, offset = -2147483640, link_dst_count =
0, link_dst = 0x0,
private_data = 0x0, changed = 0}, min_align = 1, mmap_rw = 0, donot_close = 0,
mmap_channels = 0x0,
running_areas = 0x0, stopped_areas = 0x0, ops = 0x400cdc20, fast_ops = 0x400cdc60,
op_arg = 0x804ffa8,
fast_op_arg = 0x804ffa8, private_data = 0x81a4a98, async_handlers = {next =
0x80e5304, prev = 0x80e5304}}
Why is running_areas == 0x0 ??
I need direct read access for this capture-stream.
--
Carlo Wood <[EMAIL PROTECTED]>
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