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Code Issues Releases Wiki Activity

improved audio delay estimation, supposed to help make the video smoother

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16105 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2005-07-26 10:47:29 +00:00
parent b80670d823
commit 897390ed1e
1 changed files with 23 additions and 16 deletions
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39
libao2/ao_jack.c
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@ -43,15 +43,12 @@ static jack_port_t *ports[MAX_CHANS];
static int num_ports; ///< Number of used ports == number of channels
static jack_client_t *client;
static float jack_latency;
static int estimate;
static volatile int paused = 0; ///< set if paused
static volatile int underrun = 0; ///< signals if an underrun occured
//! If this is defined try to make a more precise delay estimation. Will be slower.
#undef JACK_ESTIMATE_DELAY
#ifdef JACK_ESTIMATE_DELAY
static volatile int callback_samples = 0;
static volatile unsigned int callback_time = 0;
#endif
static volatile float callback_interval = 0;
static volatile float callback_time = 0;
//! size of one chunk, if this is too small MPlayer will start to "stutter"
//! after a short time of playback
@ -186,10 +183,15 @@ static int outputaudio(jack_nframes_t nframes, void *arg) {
underrun = 1;
if (paused || underrun)
silence(bufs, nframes, num_ports);
#ifdef JACK_ESTIMATE_DELAY
callback_samples = nframes;
callback_time = GetTimer();
#endif
if (estimate) {
float now = (float)GetTimer() / 1000000.0;
float diff = callback_time + callback_interval - now;
if (diff < 0.002)
callback_time += callback_interval;
else
callback_time = now;
callback_interval = (float)nframes / (float)ao_data.samplerate;
}
return 0;
}
@ -204,7 +206,9 @@ static void print_help ()
" connects MPlayer to the jack ports named myout\n"
"\nOptions:\n"
" port=<port name>\n"
" Connects to the given ports instead of the default physical ones\n");
" Connects to the given ports instead of the default physical ones\n"
" estimate\n"
" Estimates the amount of data in buffers (experimental)\n");
}
static int init(int rate, int channels, int format, int flags) {
@ -213,10 +217,12 @@ static int init(int rate, int channels, int format, int flags) {
char client_name[40];
opt_t subopts[] = {
{"port", OPT_ARG_MSTRZ, &port_name, NULL},
{"estimate", OPT_ARG_BOOL, &estimate, NULL},
{NULL}
};
int port_flags = JackPortIsInput;
int i;
estimate = 1;
if (subopt_parse(ao_subdevice, subopts) != 0) {
print_help();
return 0;
@ -269,6 +275,7 @@ static int init(int rate, int channels, int format, int flags) {
rate = jack_get_sample_rate(client);
jack_latency = (float)(jack_port_get_total_latency(client, ports[0]) +
jack_get_buffer_size(client)) / (float)rate;
callback_interval = 0;
buffer = (unsigned char *) malloc(BUFFSIZE);
ao_data.channels = channels;
@ -343,11 +350,11 @@ static int play(void *data, int len, int flags) {
static float get_delay() {
int buffered = BUFFSIZE - CHUNK_SIZE - buf_free(); // could be less
float in_jack = jack_latency;
#ifdef JACK_ESTIMATE_DELAY
unsigned int elapsed = GetTimer() - callback_time;
in_jack += (float)callback_samples / (float)ao_data.samplerate - (float)elapsed / 1000.0 / 1000.0;
if (in_jack < 0) in_jack = 0;
#endif
if (estimate && callback_interval > 0) {
float elapsed = (float)GetTimer() / 1000000.0 - callback_time;
in_jack += callback_interval - elapsed;
if (in_jack < 0) in_jack = 0;
}
return (float)buffered / (float)ao_data.bps + in_jack;
}