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tv: remove some differences between immediate/normal mode 

The immediate mode (which is the default) uses a tiny ringbuffer and
doesn't grab timestamps. This leads to quite bad behavior due to the
fact that there's an additional buffer between playloop and TV code (the
demuxer thread, which doesn't exist in MPlayer).

Always grab the timestamps and use a decently-sized buffer. I still have
no clue what I'm doing, and hacked it until it appeared to work. Report
regressions if you experience any.
This commit is contained in:
wm4 2014-10-25 17:56:29 +02:00
parent c6a1b8ebcc
commit 34f2970157
1 changed files with 23 additions and 38 deletions
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61
stream/tvi_v4l2.c
View File

@ -1243,12 +1243,7 @@ static int start(priv_t *priv)
init_audio(priv);
if (priv->tv_param->audio && !priv->audio_initialized) return 0;
/* we need this to size the audio buffer properly */
if (priv->immediate_mode) {
priv->video_buffer_size_max = 2;
} else {
priv->video_buffer_size_max = get_capture_buffer_size(priv);
}
priv->video_buffer_size_max = get_capture_buffer_size(priv);
if (priv->tv_param->audio) {
setup_audio_buffer_sizes(priv);
@ -1319,11 +1314,7 @@ static int start(priv_t *priv)
priv->video_cnt = 0;
/* request buffers */
if (priv->immediate_mode) {
request.count = 2;
} else {
request.count = BUFFER_COUNT;
}
request.count = BUFFER_COUNT;
request.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
request.memory = V4L2_MEMORY_MMAP;
@ -1435,12 +1426,10 @@ static void *video_grabber(void *data)
{
int ret;
if (priv->immediate_mode) {
while (priv->video_cnt == priv->video_buffer_size_max) {
usleep(10000);
if (priv->shutdown) {
return NULL;
}
while (priv->video_cnt == priv->video_buffer_size_max) {
usleep(10000);
if (priv->shutdown) {
return NULL;
}
}
@ -1513,19 +1502,17 @@ static void *video_grabber(void *data)
interval = priv->curr_frame - priv->first_frame;
delta = interval - prev_interval;
if (!priv->immediate_mode) {
// interpolate the skew in time
if (priv->tv_param->audio) pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
if (priv->tv_param->audio) pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > delta*MAX_SKEW_DELTA) {
skew = prev_skew + delta*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -delta*MAX_SKEW_DELTA) {
skew = prev_skew - delta*MAX_SKEW_DELTA;
} else {
skew = xskew;
}
// interpolate the skew in time
if (priv->tv_param->audio) pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
if (priv->tv_param->audio) pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > delta*MAX_SKEW_DELTA) {
skew = prev_skew + delta*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -delta*MAX_SKEW_DELTA) {
skew = prev_skew - delta*MAX_SKEW_DELTA;
} else {
skew = xskew;
}
MP_TRACE(priv, "\nfps = %f, interval = %f, a_skew = %f, corr_skew = %f\n",
@ -1553,17 +1540,15 @@ static void *video_grabber(void *data)
pthread_mutex_unlock(&priv->video_buffer_mutex);
if (priv->video_cnt == priv->video_buffer_size_current) {
if (!priv->immediate_mode) {
MP_ERR(priv, "\nvideo buffer full - dropping frame\n");
if (priv->audio_insert_null_samples) {
pthread_mutex_lock(&priv->audio_mutex);
priv->dropped_frames_timeshift += delta;
pthread_mutex_unlock(&priv->audio_mutex);
}
MP_ERR(priv, "\nvideo buffer full - dropping frame\n");
if (!priv->immediate_mode || priv->audio_insert_null_samples) {
pthread_mutex_lock(&priv->audio_mutex);
priv->dropped_frames_timeshift += delta;
pthread_mutex_unlock(&priv->audio_mutex);
}
} else {
if (priv->immediate_mode) {
priv->video_ringbuffer[priv->video_tail].timestamp = -1;
priv->video_ringbuffer[priv->video_tail].timestamp = interval - skew;
} else {
// compensate for audio skew
// negative skew => there are more audio samples, increase interval