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Code Issues Releases Activity

avdevice/decklink_dec: use a custom memory allocator

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The default memory allocator is limited in the max number of frames available,
and therefore caused frame drops if the frames were not freed fast enough.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-06-04 10:02:46 +02:00
parent 8a0c2901f1
commit 643123b29d
1 changed files with 50 additions and 0 deletions
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50
libavdevice/decklink_dec.cpp
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@ -21,6 +21,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <atomic>
using std::atomic;
/* Include internal.h first to avoid conflict between winsock.h (used by
* DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
extern "C" {
@ -98,6 +101,44 @@ static VANCLineNumber vanc_line_numbers[] = {
{bmdModeUnknown, 0, -1, -1, -1}
};
class decklink_allocator : public IDeckLinkMemoryAllocator
{
public:
decklink_allocator(): _refs(1) { }
virtual ~decklink_allocator() { }
// IDeckLinkMemoryAllocator methods
virtual HRESULT STDMETHODCALLTYPE AllocateBuffer(unsigned int bufferSize, void* *allocatedBuffer)
{
void *buf = av_malloc(bufferSize + AV_INPUT_BUFFER_PADDING_SIZE);
if (!buf)
return E_OUTOFMEMORY;
*allocatedBuffer = buf;
return S_OK;
}
virtual HRESULT STDMETHODCALLTYPE ReleaseBuffer(void* buffer)
{
av_free(buffer);
return S_OK;
}
virtual HRESULT STDMETHODCALLTYPE Commit() { return S_OK; }
virtual HRESULT STDMETHODCALLTYPE Decommit() { return S_OK; }
// IUnknown methods
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
virtual ULONG STDMETHODCALLTYPE AddRef(void) { return ++_refs; }
virtual ULONG STDMETHODCALLTYPE Release(void)
{
int ret = --_refs;
if (!ret)
delete this;
return ret;
}
private:
std::atomic<int> _refs;
};
extern "C" {
static void decklink_object_free(void *opaque, uint8_t *data)
{
@ -924,6 +965,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
{
struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
struct decklink_ctx *ctx;
class decklink_allocator *allocator;
AVStream *st;
HRESULT result;
char fname[1024];
@ -1017,6 +1059,14 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
ctx->input_callback = new decklink_input_callback(avctx);
ctx->dli->SetCallback(ctx->input_callback);
allocator = new decklink_allocator();
ret = (ctx->dli->SetVideoInputFrameMemoryAllocator(allocator) == S_OK ? 0 : AVERROR_EXTERNAL);
allocator->Release();
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot set custom memory allocator\n");
goto error;
}
if (mode_num == 0 && !cctx->format_code) {
if (decklink_autodetect(cctx) < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot Autodetect input stream or No signal\n");