Re: Master Plan on rewinding

["Alexander E. Patrakov" <patrakov@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1025 bytes --]

21.09.2014 15:53, Clemens Ladisch wrote:
> Raymond Yau wrote:
>> Does snd-oxygen provide this position with granularity which is less than
>> the minimum period size ?
>
> Yes.  Its DMA controller uses a burst size of 32 bytes.  The pointer registers
> are documented as reporting the position with 4-byte accuracy, but there were
> problems when the period/buffer sizes were not aligned to 32 bytes.  I've set
> the minimum period size to 64 bytes, just to be safe.

Well, my friend has tested the card anyway, and I am afraid that the 
situation is in fact more complex than documented. Look how fast (8 
samples per ioctl in a busy loop!) the card eats the first 256 samples. 
This is very suspicious, and I am not really sure whether we can 
actually perform a rewind over these 256 samples.

The "usual" step of the pointer updates (via snd_pcm_avail) is indeed 8 
samples = 32 bytes with some fine-grained updates sometimes showing up 
in the middle, which matches the documented burst size.

-- 
Alexander E. Patrakov

[-- Attachment #2: pcm_avail.c --]
[-- Type: text/x-csrc, Size: 3669 bytes --]

/*
 *  This extra small demo sends silence to your speakers and tests the precision of the reported position.
 */

#include <asoundlib.h>

#include <stdio.h>
#include <stdlib.h>

const char* device = "hw:0";
const int channels = 2;
const snd_pcm_sframes_t period_size = 1024;
const int periods = 4;
const int rate = 48000;


int main(int argc, char* argv[])
{
        int err;
	int failed = 0;
        unsigned int j;
	short *silence;
	snd_pcm_sframes_t avail = -1;
	snd_pcm_uframes_t min_period_size;
	snd_pcm_uframes_t boundary;
	int dir;

        snd_pcm_t *handle;
	snd_output_t *out = NULL;

	snd_pcm_hw_params_t *params;
	snd_pcm_sw_params_t *swparams;

	snd_pcm_hw_params_alloca(&params);
	snd_pcm_sw_params_alloca(&swparams);

	snd_output_stdio_attach(&out, stderr, 0);
	silence = calloc(period_size * periods, sizeof(short) * channels);

	if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
		fprintf(stderr, "Playback open error: %s\n", snd_strerror(err));
		exit(EXIT_FAILURE);
	}

	failed =           (err = snd_pcm_hw_params_any(handle, params)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_rate_resample(handle, params, 1)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_channels(handle, params, channels)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_rate(handle, params, rate, 0)) < 0;

	if (failed) {
		fprintf(stderr, "Playback hwparams (access & format) error: %s\n", snd_strerror(err));
		exit(EXIT_FAILURE);
	}

	err = snd_pcm_hw_params_get_period_size_min(params, &min_period_size, &dir);
	if (err < 0) {
		fprintf(stderr, "Cannot get minimum period size: %s\n", snd_strerror(err));
	}

	fprintf(stderr, "min_period_size: %d frames, dir: %d\n", (int)min_period_size, dir);

	failed =           (err = snd_pcm_hw_params_set_period_size(handle, params, period_size, 0)) < 0;
	failed = failed || (err = snd_pcm_hw_params_set_periods(handle, params, periods, 0)) < 0;
	failed = failed || (err = snd_pcm_hw_params(handle, params)) < 0;
	if (failed) {
		fprintf(stderr, "Playback hwparams (period size & periods) error: %s\n", snd_strerror(err));
		exit(EXIT_FAILURE);
	}

	err = snd_pcm_hw_params_get_fifo_size(params);
	if (err < 0) {
		fprintf(stderr, "Playback hwparams: can't get FIFO size, error: %s\n", snd_strerror(err));
	} else {
		fprintf(stderr, "Playback hwparams: FIFO size is %d\n", err);
	}

	failed =           (err = snd_pcm_sw_params_current(handle, swparams)) < 0;
	failed = failed || (err = snd_pcm_sw_params_set_start_threshold(handle, swparams, period_size)) < 0;
	failed = failed || (err = snd_pcm_sw_params_set_avail_min(handle, swparams, period_size)) < 0;
	failed = failed || (err = snd_pcm_sw_params(handle, swparams)) < 0;
	if (failed) {
		fprintf(stderr, "Playback swparams error: %s\n", snd_strerror(err));
		exit(EXIT_FAILURE);
	}

	snd_pcm_dump(handle, out);
	fprintf(stderr, "Playing silence\n");
	fflush(stderr);
	memset(silence, 0, period_size * periods * sizeof(short) * channels);
	err = snd_pcm_writei(handle, silence, period_size * periods);
	if (err < 0) {
		fprintf(stderr, "Playback error: %s\n", snd_strerror(err));
		exit(EXIT_FAILURE);
	}

	j = 0;
	while (1) {
		snd_pcm_sframes_t avail1 = snd_pcm_avail(handle);
		if (avail1 < 0)
			break;
		if (avail != avail1) {
			fprintf(stderr, "Available: %d, loop iteration: %d\n", (int)avail1, j);
		}
		avail = avail1;
		j++;
	}
	snd_pcm_drop(handle);
	snd_pcm_close(handle);

	free(silence);
	return 0;
}

[-- Attachment #3: report.txt --]
[-- Type: text/plain, Size: 22544 bytes --]

min_period_size: 16 frames, dir: 0
Playback hwparams: FIFO size is 0
Hardware PCM card 0 'Xonar DX' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1024
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Playing silence
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