static int cps_get_position(void* data, int64_t* position)
{
ClipSource* clipSource = (ClipSource*)data;
if (clipSource->duration >= 0)
{
int64_t targetPosition;
if (!msc_get_position(clipSource->targetSource, &targetPosition))
{
return 0;
}
*position = targetPosition - clipSource->start;
*position = (*position > clipSource->duration) ? clipSource->duration : *position;
*position = (*position < 0) ? 0 : *position;
return 1;
}
else if (clipSource->start > 0)
{
int64_t targetPosition;
if (!msc_get_position(clipSource->targetSource, &targetPosition))
{
return 0;
}
*position = targetPosition - clipSource->start;
*position = (*position < 0) ? 0 : *position;
return 1;
}
return msc_get_position(clipSource->targetSource, position);
}
static int cps_read_frame(void* data, const FrameInfo* frameInfo, MediaSourceListener* listener)
{
ClipSource* clipSource = (ClipSource*)data;
if (clipSource->duration >= 0)
{
/* check the position is within the clip boundaries */
int64_t position;
if (!msc_get_position(clipSource->targetSource, &position))
{
return -1;
}
if (position < clipSource->start ||
position >= clipSource->start + clipSource->duration)
{
return -1;
}
}
else if (clipSource->start > 0)
{
/* check the position is within the clip boundaries */
int64_t position;
if (!msc_get_position(clipSource->targetSource, &position))
{
return -1;
}
if (position < clipSource->start)
{
return -1;
}
}
return msc_read_frame(clipSource->targetSource, frameInfo, listener);
}
static int cps_seek_timecode(void* data, const Timecode* timecode, TimecodeType type, TimecodeSubType subType)
{
ClipSource* clipSource = (ClipSource*)data;
int64_t originalPosition = -1;
int64_t position;
/* get position so we can recover is seek is outside the clip boundaries */
if (!msc_get_position(clipSource->targetSource, &originalPosition))
{
originalPosition = -1; /* unknown */
}
int result = msc_seek_timecode(clipSource->targetSource, timecode, type, subType);
if (originalPosition < 0 || result != 0)
{
return result;
}
/* check the seek is within the clip boundaries */
if (!msc_get_position(clipSource->targetSource, &position))
{
/* TODO: what now? */
/* assume outside - go back to original position */
msc_seek(clipSource->targetSource, originalPosition);
return -1;
}
if (clipSource->duration >= 0)
{
if (position < clipSource->start ||
position > clipSource->start + clipSource->duration)
{
/* outside - go back to original position */
msc_seek(clipSource->targetSource, originalPosition);
return -1;
}
}
else if (clipSource->start > 0)
{
if (position < clipSource->start)
{
/* outside - go back to original position */
msc_seek(clipSource->targetSource, originalPosition);
return -1;
}
}
return result;
}
static int sync_sources(MultipleMediaSources* multSource)
{
MediaSourceElement* ele = &multSource->sources;
int64_t position;
int syncResult = 0;
while (ele != NULL && ele->source != NULL)
{
if (!SOURCE_IS_DISABLED(ele))
{
if (!msc_get_position(ele->source, &position))
{
syncResult = -1;
break;
}
if (position != multSource->syncPosition)
{
/* seek back to the sync position */
syncResult = msc_seek(ele->source, multSource->syncPosition);
if (syncResult != 0)
{
break;
}
}
}
ele = ele->next;
}
return syncResult;
}
static int cps_eof(void* data)
{
ClipSource* clipSource = (ClipSource*)data;
if (clipSource->duration >= 0)
{
if (msc_eof(clipSource->targetSource))
{
return 1;
}
int64_t position;
if (!msc_get_position(clipSource->targetSource, &position))
{
return 0;
}
return position >= clipSource->start + clipSource->duration;
}
return msc_eof(clipSource->targetSource);
}
static int mls_seek_timecode(void* data, const Timecode* timecode, TimecodeType type, TimecodeSubType subType)
{
MultipleMediaSources* multSource = (MultipleMediaSources*)data;
MediaSourceElement* ele = &multSource->sources;
int seekResult = 0;
int haveATimedOutResult = 0;
int failed = 0;
MediaSourceElement* passedEle = NULL;
int64_t position;
int syncResult;
/* make sure the sources are in sync */
if ((syncResult = sync_sources(multSource)) != 0)
{
return syncResult;
}
/* find the source that supports and successfully seeks to the timecode */
while (ele != NULL && ele->source != NULL)
{
if (!SOURCE_IS_DISABLED(ele))
{
seekResult = msc_seek_timecode(ele->source, timecode, type, subType);
if (seekResult == 0)
{
passedEle = ele;
if (!msc_get_position(ele->source, &position))
{
ml_log_error("Failed to get position at seek to timecode\n");
return -1;
}
break;
}
else if (seekResult == -2)
{
haveATimedOutResult = 1;
}
}
ele = ele->next;
}
if (passedEle == NULL)
{
/* none of the sources could be seeked to the timecode */
if (haveATimedOutResult)
{
/* assume that the timed out source could have seeked to the timecode */
return -2;
}
return -1;
}
/* try seek to the position corresponding to the timecode for the sources that failed */
ele = &multSource->sources;
while (ele != NULL && ele->source != NULL)
{
if (!SOURCE_IS_DISABLED(ele))
{
if (ele != passedEle && msc_seek(ele->source, position) != 0)
{
failed = 1;
break;
}
}
ele = ele->next;
}
if (!failed)
{
/* update sync position */
multSource->syncPosition = position;
}
return !failed ? 0 : -1;
}