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Diffstat (limited to 'src/audio_out/audio_oss_out.c')
-rw-r--r--src/audio_out/audio_oss_out.c145
1 files changed, 28 insertions, 117 deletions
diff --git a/src/audio_out/audio_oss_out.c b/src/audio_out/audio_oss_out.c
index e8a9eacca..c5b387bea 100644
--- a/src/audio_out/audio_oss_out.c
+++ b/src/audio_out/audio_oss_out.c
@@ -17,7 +17,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
- * $Id: audio_oss_out.c,v 1.7 2001/05/27 23:48:12 guenter Exp $
+ * $Id: audio_oss_out.c,v 1.8 2001/06/04 17:13:36 guenter Exp $
*/
#ifdef HAVE_CONFIG_H
@@ -69,8 +69,7 @@
#define AUDIO_NUM_FRAGMENTS 15
#define AUDIO_FRAGMENT_SIZE 8192
-#define GAP_TOLERANCE 15000
-#define MAX_MASTER_CLOCK_DIV 5000
+#define GAP_TOLERANCE 5000
#ifdef CONFIG_DEVFS_FS
#define DSP_TEMPLATE "/dev/sound/dsp%d"
@@ -90,15 +89,10 @@ typedef struct oss_functions_s {
int mode;
int32_t output_sample_rate, input_sample_rate;
- int32_t output_rate_correction;
double sample_rate_factor;
uint32_t num_channels;
uint32_t bytes_in_buffer; /* number of bytes writen to audio hardware */
- uint32_t last_vpts; /* vpts at which last written package ends */
-
- uint32_t sync_vpts; /* this syncpoint is used as a starting point */
- uint32_t sync_bytes_in_buffer; /* for vpts <-> samplecount assoc */
int audio_step; /* pts per 32 768 samples (sample = #bytes/2) */
int32_t bytes_per_kpts; /* bytes per 1024/90000 sec */
@@ -136,10 +130,6 @@ static int ao_open(ao_functions_t *this_gen,
this->mode = mode;
this->input_sample_rate = rate;
this->bytes_in_buffer = 0;
- this->last_vpts = 0;
- this->output_rate_correction = 0;
- this->sync_vpts = 0;
- this->sync_bytes_in_buffer = 0;
this->audio_started = 0;
/*
@@ -241,32 +231,6 @@ static int ao_open(ao_functions_t *this_gen,
return 1;
}
-static uint32_t ao_get_current_vpts (oss_functions_t *this) {
-
- int pos ;
- int32_t diff ;
- uint32_t vpts ;
-
- count_info info;
-
- if (this->audio_started) {
- ioctl (this->audio_fd, SNDCTL_DSP_GETOPTR, &info);
-
- pos = info.bytes;
-
- } else
- pos = 0;
-
- diff = this->sync_bytes_in_buffer - pos;
-
- vpts = this->sync_vpts - diff * 1024 / this->bytes_per_kpts;
-
- xprintf (AUDIO|VERBOSE,"audio_oss_out: get_current_vpts pos=%d diff=%d vpts=%d sync_vpts=%d\n",
- pos, diff, vpts, this->sync_vpts);
-
- return vpts;
-}
-
static void ao_fill_gap (oss_functions_t *this, uint32_t pts_len) {
int num_bytes = pts_len * this->bytes_per_kpts / 1024;
@@ -286,8 +250,6 @@ static void ao_fill_gap (oss_functions_t *this, uint32_t pts_len) {
num_bytes = 0;
}
}
-
- this->last_vpts += pts_len;
}
static void ao_write_audio_data(ao_functions_t *this_gen,
@@ -296,99 +258,58 @@ static void ao_write_audio_data(ao_functions_t *this_gen,
{
oss_functions_t *this = (oss_functions_t *) this_gen;
- uint32_t vpts,
- audio_vpts,
- master_vpts;
- int32_t diff, gap;
- int bDropPackage;
- uint16_t sample_buffer[8192];
-
+ uint32_t vpts, buffer_vpts;
+ int32_t gap;
+ int bDropPackage;
+ uint16_t sample_buffer[10000];
+ count_info info;
+ int pos;
if (this->audio_fd<0)
return;
vpts = this->metronom->got_audio_samples (this->metronom, pts_, num_samples);
- xprintf (VERBOSE|AUDIO, "audio_oss_out: got %d samples, vpts=%d, last_vpts=%d\n",
- num_samples, vpts, this->last_vpts);
+ xprintf (VERBOSE|AUDIO, "audio_oss_out: got %d samples, vpts=%d\n",
+ num_samples, vpts);
/*
- * check if these samples "fit" in the audio output buffer
- * or do we have an audio "gap" here?
+ * where, in the timeline is the "end" of the audio buffer at the moment?
*/
-
- gap = vpts - this->last_vpts ;
-
- /*
- printf ("audio_oss_out: gap = %d - %d + %d = %d\n",
- vpts, this->last_vpts, diff, gap);
- */
- bDropPackage = 0;
-
- if (gap>GAP_TOLERANCE) {
- ao_fill_gap (this, gap);
- } else if (gap<-GAP_TOLERANCE) {
- bDropPackage = 1;
- }
+ buffer_vpts = this->metronom->get_current_time (this->metronom);
- /*
- * sync on master clock
- */
+ if (this->audio_started) {
+ ioctl (this->audio_fd, SNDCTL_DSP_GETOPTR, &info);
+ pos = info.bytes;
+ } else
+ pos = 0;
- audio_vpts = ao_get_current_vpts (this) ;
- master_vpts = this->metronom->get_current_time (this->metronom);
- diff = audio_vpts - master_vpts;
+ buffer_vpts += (this->bytes_in_buffer - pos) * 1024 / this->bytes_per_kpts;
- xprintf (AUDIO|VERBOSE, "audio_oss_out: syncing on master clock: audio_vpts=%d master_vpts=%d\n",
- audio_vpts, master_vpts);
- /*
- printf ("audio_oss_out: audio_vpts=%d <=> master_vpts=%d (diff=%d)\n",
- audio_vpts, master_vpts, diff);
- */
+ printf ("audio_oss_out: got audio package vpts = %d, buffer_vpts = %d\n",
+ vpts, buffer_vpts);
/*
- * method 1 : resampling
+ * calculate gap:
*/
- /*
- if (abs(diff)>5000) {
-
- if (diff>5000) {
- ao_fill_gap (diff);
- } else if (diff<-5000) {
- bDropPackage = 1;
- }
-
- } else if (abs(diff)>1000) {
- this->output_rate_correction = diff/10 ;
-
- printf ("audio_oss_out: diff = %d => rate correction : %d\n", diff, this->output_rate_correction);
-
- if ( this->output_rate_correction < -500)
- this->output_rate_correction = -500;
- else if ( this->output_rate_correction > 500)
- this->output_rate_correction = 500;
- }
- */
+ gap = vpts - buffer_vpts;
- /*
- * method 2: adjust master clock
- */
-
+ bDropPackage = 0;
- if (abs(diff)>MAX_MASTER_CLOCK_DIV) {
- printf ("master clock adjust time %d -> %d (diff: %d)\n", master_vpts, audio_vpts, diff);
- this->metronom->adjust_clock (this->metronom, audio_vpts);
+ if (gap>GAP_TOLERANCE) {
+ ao_fill_gap (this, gap);
+ } else if (gap<-GAP_TOLERANCE) {
+ bDropPackage = 1;
}
-
/*
* resample and output samples
*/
if (!bDropPackage) {
- int num_output_samples = num_samples * (this->output_sample_rate + this->output_rate_correction) / this->input_sample_rate;
+ int num_output_samples = num_samples * (this->output_sample_rate) / this->input_sample_rate;
switch (this->mode) {
case AO_CAP_MODE_MONO:
@@ -422,13 +343,6 @@ static void ao_write_audio_data(ao_functions_t *this_gen,
xprintf (AUDIO|VERBOSE, "audio_oss_out :audio package written\n");
/*
- * remember vpts
- */
-
- this->sync_vpts = vpts;
- this->sync_bytes_in_buffer = this->bytes_in_buffer;
-
- /*
* step values
*/
@@ -436,10 +350,7 @@ static void ao_write_audio_data(ao_functions_t *this_gen,
this->audio_started = 1;
} else {
printf ("audio_oss_out: audio package (vpts = %d) dropped\n", vpts);
- this->sync_vpts = vpts;
}
-
- this->last_vpts = vpts + num_samples * 90000 / this->input_sample_rate ;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-09 14:47:28 +0000