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add support for mmap read

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This commit is contained in:
Eric Laurent
2013-09-16 14:31:17 -07:00
parent 782bfda5e7
commit bb7c5dfd95
2 changed files with 30 additions and 7 deletions
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include/tinyalsa/asoundlib.h
+1
View File
@@ -185,6 +185,7 @@ int pcm_read(struct pcm *pcm, void *data, unsigned int count);
* mmap() support.
*/
int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count);
int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count);
int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
unsigned int *frames);
int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames);
pcm.c
+29 -7
View File
@@ -300,7 +300,7 @@ static void pcm_hw_munmap_status(struct pcm *pcm) {
}
static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
const char *src, unsigned int src_offset,
char *buf, unsigned int src_offset,
unsigned int frames)
{
int size_bytes = pcm_frames_to_bytes(pcm, frames);
@@ -308,12 +308,18 @@ static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset);
/* interleaved only atm */
memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
src + src_offset_bytes, size_bytes);
if (pcm->flags & PCM_IN)
memcpy(buf + src_offset_bytes,
(char*)pcm->mmap_buffer + pcm_offset_bytes,
size_bytes);
else
memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
buf + src_offset_bytes,
size_bytes);
return 0;
}
static int pcm_mmap_write_areas(struct pcm *pcm, const char *src,
static int pcm_mmap_transfer_areas(struct pcm *pcm, char *buf,
unsigned int offset, unsigned int size)
{
void *pcm_areas;
@@ -323,7 +329,7 @@ static int pcm_mmap_write_areas(struct pcm *pcm, const char *src,
while (size > 0) {
frames = size;
pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
pcm_areas_copy(pcm, pcm_offset, src, offset, frames);
pcm_areas_copy(pcm, pcm_offset, buf, offset, frames);
commit = pcm_mmap_commit(pcm, pcm_offset, frames);
if (commit < 0) {
oops(pcm, commit, "failed to commit %d frames\n", frames);
@@ -894,7 +900,7 @@ int pcm_wait(struct pcm *pcm, int timeout)
return 1;
}
int pcm_mmap_write(struct pcm *pcm, const void *buffer, unsigned int bytes)
int pcm_mmap_transfer(struct pcm *pcm, const void *buffer, unsigned int bytes)
{
int err = 0, frames, avail;
unsigned int offset = 0, count;
@@ -955,7 +961,7 @@ int pcm_mmap_write(struct pcm *pcm, const void *buffer, unsigned int bytes)
break;
/* copy frames from buffer */
frames = pcm_mmap_write_areas(pcm, buffer, offset, frames);
frames = pcm_mmap_transfer_areas(pcm, (void *)buffer, offset, frames);
if (frames < 0) {
fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n",
(unsigned int)pcm->mmap_status->hw_ptr,
@@ -970,3 +976,19 @@ int pcm_mmap_write(struct pcm *pcm, const void *buffer, unsigned int bytes)
return 0;
}
int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count)
{
if ((~pcm->flags) & (PCM_OUT | PCM_MMAP))
return -ENOSYS;
return pcm_mmap_transfer(pcm, (void *)data, count);
}
int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count)
{
if ((~pcm->flags) & (PCM_IN | PCM_MMAP))
return -ENOSYS;
return pcm_mmap_transfer(pcm, data, count);
}