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added system for resending recent samples as a form of

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preemptive retransmission to deal with wifi packet loss.
This commit is contained in:
gardners 2012-04-24 20:49:59 +09:30
parent 2831507c8d
commit 30471f19ef
2 changed files with 44 additions and 11 deletions
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11
serval.h
View File

@ -1261,6 +1261,14 @@ typedef struct vomp_call_half {
unsigned long long milliseconds_since_call_start;
} vomp_call_half;
typedef struct vomp_sample_block {
unsigned int codec;
unsigned long long starttime;
unsigned long long endtime;
unsigned char bytes[1024];
} vomp_sample_block;
#define VOMP_MAX_RECENT_SAMPLES 8
typedef struct vomp_call_state {
vomp_call_half local;
vomp_call_half remote;
@ -1271,6 +1279,8 @@ typedef struct vomp_call_state {
int last_sent_status;
int next_status_time;
unsigned char remote_codec_list[256];
int recent_sample_rotor;
vomp_sample_block recent_samples[VOMP_MAX_RECENT_SAMPLES];
} vomp_call_state;
#define VOMP_CODEC_NONE 0x00
@ -1306,6 +1316,7 @@ char *vomp_describe_codec(int c);
int vomp_tick();
int vomp_tick_interval();
int vomp_sample_size(int c);
int vomp_codec_timespan(int c);
typedef struct command_line_option {
int (*function)(int argc, const char *const *argv, struct command_line_option *o);

44
vomp.c
View File

@ -230,15 +230,35 @@ int vomp_send_status(vomp_call_state *call,int flags,overlay_mdp_frame *arg)
p[(*len)++]=(now_rel_call>>8)&0xff;
p[(*len)++]=(now_rel_call>>0)&0xff;
/* now codec code and sample block */
p[(*len)++]=arg->vompevent.audio_sample_codec;
int i;
for(i=0;i<arg->vompevent.audio_sample_bytes;i++)
p[(*len)++]=arg->vompevent.audio_bytes[i];
} else {
WHYF("Sample bytes(%d) != codec specification(%d)",
arg->vompevent.audio_sample_bytes,
vomp_sample_size(arg->vompevent.audio_sample_codec));
/* record sample in recent list */
vomp_sample_block *sb=call->recent_samples;
int rotor=call->recent_sample_rotor%VOMP_MAX_RECENT_SAMPLES;
sb[rotor].codec=arg->vompevent.audio_sample_codec;
sb[rotor].endtime=now_rel_call;
sb[rotor].starttime=now_rel_call-vomp_codec_timespan(sb[rotor].codec);
bcopy(&arg->vompevent.audio_bytes[0],&sb[rotor].bytes[0],
vomp_sample_size(sb[rotor].codec));
/* stuff frame with most recent sample blocks as a form of preemptive
retransmission. But don't make the packets too large. */
while ((*len)<256) {
WHYF("TOP rotor=%d, codec=%s, endtime=%lld",
rotor,vomp_describe_codec(sb[rotor].codec),
sb[rotor].endtime);
p[(*len)++]=sb[rotor].codec;
bcopy(&sb[rotor].bytes[0],&p[*len],vomp_sample_size(sb[rotor].codec));
(*len)+=vomp_sample_size(sb[rotor].codec);
rotor--; if (rotor<0) rotor+=VOMP_MAX_RECENT_SAMPLES;
rotor%=VOMP_MAX_RECENT_SAMPLES;
WHYF("END rotor=%d, codec=%s, endtime=%lld",
rotor,vomp_describe_codec(sb[rotor].codec),
sb[rotor].endtime);
if ((!sb[rotor].endtime)||(sb[rotor].endtime==now_rel_call)) break;
}
call->recent_sample_rotor++;
call->recent_sample_rotor%=VOMP_MAX_RECENT_SAMPLES;
}
}
@ -299,7 +319,8 @@ int vomp_call_start_audio(vomp_call_state *call)
int vomp_process_audio(vomp_call_state *call,overlay_mdp_frame *mdp)
{
int ofs=14;
WHYF("got here (payload has %d bytes)",mdp->in.payload_length);
if (mdp->in.payload_length>14)
WHYF("got here (payload has %d bytes)",mdp->in.payload_length);
/* Get end time marker for sample block collection */
unsigned int e=0;
@ -643,7 +664,8 @@ int vomp_mdp_event(overlay_mdp_frame *mdp,
WHY("Audio packet arrived");
vomp_call_state *call
=vomp_find_call_by_session(mdp->vompevent.call_session_token);
return vomp_send_status(call,VOMP_TELLREMOTE|VOMP_SENDAUDIO,mdp);
if (call)
return vomp_send_status(call,VOMP_TELLREMOTE|VOMP_SENDAUDIO,mdp);
}
break;
default: