/*access to the first available CU for rendering
this is a blocking call since input may change the output (temporal scalability)*/
GF_CMUnit *gf_cm_get_output(GF_CompositionMemory *cb)
{
GF_CMUnit *out = NULL;
/*if paused or stop or buffering, do nothing*/
switch (cb->Status) {
case CB_BUFFER:
return NULL;
case CB_STOP:
case CB_PAUSE:
/*only visual buffers deliver data when paused*/
if (cb->odm->codec->type != GF_STREAM_VISUAL) goto exit;
break;
}
/*no output*/
if (!cb->output->dataLength) {
if ((cb->Status != CB_STOP) && cb->HasSeenEOS && (cb->odm && cb->odm->codec)) {
GF_LOG(GF_LOG_DEBUG, GF_LOG_COMPOSE, ("[ODM%d] Switching composition memory to stop state - time %d\n", cb->odm->OD->objectDescriptorID, (u32) cb->odm->media_stop_time));
cb->Status = CB_STOP;
cb->odm->current_time = (u32) cb->odm->media_stop_time;
/*force update of media time*/
MS_UpdateTiming(cb->odm, 1);
}
goto exit;
}
/*update the timing*/
if ((cb->Status != CB_STOP) && cb->odm && cb->odm->codec) {
cb->odm->current_time = cb->output->TS;
/*handle visual object - EOS if no more data (we keep the last CU for rendering, so check next one)*/
if (cb->HasSeenEOS && (!cb->output->next->dataLength || (cb->Capacity==1))) {
GF_LOG(GF_LOG_DEBUG, GF_LOG_COMPOSE, ("[ODM%d] Switching composition memory to stop state - time %d\n", cb->odm->OD->objectDescriptorID, (u32) cb->odm->media_stop_time));
cb->Status = CB_STOP;
cb->odm->current_time = (u32) cb->odm->media_stop_time;
/*force update of media time*/
MS_UpdateTiming(cb->odm, 1);
}
}
out = cb->output;
exit:
return out;
}
/*render : setup media sensor and update timing in case of inline scenes*/
void RenderMediaSensor(SFNode *node, void *rs)
{
Clock *ck;
MediaSensorStack *st = Node_GetPrivate(node);
if (!st->stream) st->stream = MO_FindObject(node, &st->sensor->url);
if (!st->stream) return;
if (!st->stream->odm) return;
if (!st->is_init) {
ChainAddEntry(st->stream->odm->ms_stack, st);
ODM_InitSegmentDescriptors(st->stream->odm, st->seg, &st->sensor->url);
st->is_init = 1;
st->active_seg = 0;
}
/*media sensor bound to natural media (audio, video) is updated when fetching the stream
data for rendering.*/
ck = NULL;
/*check inline scenes - if the scene is set to restart DON'T MODIFY SENSOR: since we need a 2 render
passes to restart inline, scene is considered as not running*/
if (st->stream->odm->subscene && !st->stream->odm->subscene->needs_restart) {
ck = st->stream->odm->subscene->scene_codec->ck;
/*since audio may be used alone through an inline scene, we need to refresh the graph*/
if (st->stream->odm->is_open) Term_InvalidateScene(st->stream->term);
}
/*check anim streams*/
else if (st->stream->odm->codec && (st->stream->odm->codec->type==M4ST_SCENE)) ck = st->stream->odm->codec->ck;
/*check OCR streams*/
else if (st->stream->odm->ocr_codec) ck = st->stream->odm->ocr_codec->ck;
if (ck && CK_IsStarted(ck) ) {
st->stream->odm->current_time = CK_GetTime(ck);
MS_UpdateTiming(st->stream->odm);
}
}