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[ALSA] oxygen: add symbols for buffer/period size constraints 

Introduce symbols for the buffer/period size constraints so that their
limits and relationships become clearer.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Clemens Ladisch 2008-05-13 09:25:39 +02:00 committed by Jaroslav Kysela
parent 4a4bc53bc5
commit d55d7a1cbb
1 changed files with 30 additions and 16 deletions
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46
sound/pci/oxygen/oxygen_pcm.c
View File

@ -24,6 +24,16 @@
#include <sound/pcm_params.h>
#include "oxygen.h"
/* most DMA channels have a 16-bit counter for 32-bit words */
#define BUFFER_BYTES_MAX ((1 << 16) * 4)
/* the multichannel DMA channel has a 24-bit counter */
#define BUFFER_BYTES_MAX_MULTICH ((1 << 24) * 4)
#define PERIOD_BYTES_MIN 64
#define DEFAULT_BUFFER_BYTES (BUFFER_BYTES_MAX / 2)
#define DEFAULT_BUFFER_BYTES_MULTICH (1024 * 1024)
static const struct snd_pcm_hardware oxygen_stereo_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
@ -44,11 +54,11 @@ static const struct snd_pcm_hardware oxygen_stereo_hardware = {
.rate_max = 192000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 256 * 1024,
.period_bytes_min = 128,
.period_bytes_max = 128 * 1024,
.buffer_bytes_max = BUFFER_BYTES_MAX,
.period_bytes_min = PERIOD_BYTES_MIN,
.period_bytes_max = BUFFER_BYTES_MAX / 2,
.periods_min = 2,
.periods_max = 2048,
.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
};
static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
@ -70,11 +80,11 @@ static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
.rate_max = 192000,
.channels_min = 2,
.channels_max = 8,
.buffer_bytes_max = 2048 * 1024,
.period_bytes_min = 128,
.period_bytes_max = 256 * 1024,
.buffer_bytes_max = BUFFER_BYTES_MAX_MULTICH,
.period_bytes_min = PERIOD_BYTES_MIN,
.period_bytes_max = BUFFER_BYTES_MAX_MULTICH / 2,
.periods_min = 2,
.periods_max = 16384,
.periods_max = BUFFER_BYTES_MAX_MULTICH / PERIOD_BYTES_MIN,
};
static const struct snd_pcm_hardware oxygen_ac97_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
@ -88,11 +98,11 @@ static const struct snd_pcm_hardware oxygen_ac97_hardware = {
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 256 * 1024,
.period_bytes_min = 128,
.period_bytes_max = 128 * 1024,
.buffer_bytes_max = BUFFER_BYTES_MAX,
.period_bytes_min = PERIOD_BYTES_MIN,
.period_bytes_max = BUFFER_BYTES_MAX / 2,
.periods_min = 2,
.periods_max = 2048,
.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
};
static const struct snd_pcm_hardware *const oxygen_hardware[PCM_COUNT] = {
@ -664,12 +674,14 @@ int oxygen_pcm_init(struct oxygen *chip)
snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(chip->pci),
512 * 1024, 2048 * 1024);
DEFAULT_BUFFER_BYTES_MULTICH,
BUFFER_BYTES_MAX_MULTICH);
if (ins)
snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(chip->pci),
128 * 1024, 256 * 1024);
DEFAULT_BUFFER_BYTES,
BUFFER_BYTES_MAX);
}
outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_1_TO_SPDIF);
@ -689,7 +701,8 @@ int oxygen_pcm_init(struct oxygen *chip)
strcpy(pcm->name, "Digital");
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(chip->pci),
128 * 1024, 256 * 1024);
DEFAULT_BUFFER_BYTES,
BUFFER_BYTES_MAX);
}
if (chip->has_ac97_1) {
@ -719,7 +732,8 @@ int oxygen_pcm_init(struct oxygen *chip)
strcpy(pcm->name, outs ? "Front Panel" : "Analog 2");
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(chip->pci),
128 * 1024, 256 * 1024);
DEFAULT_BUFFER_BYTES,
BUFFER_BYTES_MAX);
}
return 0;
}