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Moved ring buffer pointers and added a mechanism to transfer them via shm

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This commit is contained in:
Jaroslav Kysela 2002-04-23 15:51:29 +00:00
parent f063381430
commit c941c548f8
26 changed files with 469 additions and 171 deletions
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11
src/pcm/pcm_hw.c
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@ -29,6 +29,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
@ -60,7 +61,7 @@ typedef struct {
int fd;
int card, device, subdevice;
int mmap_emulation;
volatile struct sndrv_pcm_mmap_status *mmap_status;
volatile struct sndrv_pcm_mmap_status * mmap_status;
struct sndrv_pcm_mmap_control *mmap_control;
int shadow_appl_ptr: 1,
avail_update_flag: 1,
@ -256,10 +257,10 @@ static int snd_pcm_hw_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
if (hw->mmap_shm) {
hw->shadow_appl_ptr = 1;
hw->appl_ptr = 0;
pcm->appl_ptr = &hw->appl_ptr;
snd_pcm_set_appl_ptr(pcm, &hw->appl_ptr, -1, 0);
} else {
hw->shadow_appl_ptr = 0;
pcm->appl_ptr = &hw->mmap_control->appl_ptr;
snd_pcm_set_appl_ptr(pcm, &hw->mmap_control->appl_ptr, hw->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL);
}
}
return 0;
@ -529,7 +530,7 @@ static int snd_pcm_hw_mmap_status(snd_pcm_t *pcm)
return -errno;
}
hw->mmap_status = ptr;
pcm->hw_ptr = &hw->mmap_status->hw_ptr;
snd_pcm_set_hw_ptr(pcm, &hw->mmap_status->hw_ptr, hw->fd, SNDRV_PCM_MMAP_OFFSET_STATUS + offsetof(struct sndrv_pcm_mmap_status, hw_ptr));
return 0;
}
@ -545,7 +546,7 @@ static int snd_pcm_hw_mmap_control(snd_pcm_t *pcm)
return -errno;
}
hw->mmap_control = ptr;
pcm->appl_ptr = &hw->mmap_control->appl_ptr;
snd_pcm_set_appl_ptr(pcm, &hw->mmap_control->appl_ptr, hw->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL);
return 0;
}