659 lines
21 KiB
C++
659 lines
21 KiB
C++
/*
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* Blackmagic DeckLink input
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* Copyright (c) 2013-2014 Luca Barbato, Deti Fliegl
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <DeckLinkAPI.h>
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#include <pthread.h>
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#include <semaphore.h>
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extern "C" {
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#include "config.h"
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#include "libavformat/avformat.h"
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#include "libavformat/internal.h"
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#include "libavutil/avutil.h"
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#include "libavutil/common.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/time.h"
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#include "libavutil/mathematics.h"
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#if CONFIG_LIBZVBI
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#include <libzvbi.h>
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#endif
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}
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#include "decklink_common.h"
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#include "decklink_dec.h"
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#if CONFIG_LIBZVBI
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static uint8_t calc_parity_and_line_offset(int line)
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{
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uint8_t ret = (line < 313) << 5;
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if (line >= 7 && line <= 22)
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ret += line;
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if (line >= 320 && line <= 335)
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ret += (line - 313);
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return ret;
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}
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int teletext_data_unit_from_vbi_data(int line, uint8_t *src, uint8_t *tgt)
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{
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vbi_bit_slicer slicer;
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vbi_bit_slicer_init(&slicer, 720, 13500000, 6937500, 6937500, 0x00aaaae4, 0xffff, 18, 6, 42 * 8, VBI_MODULATION_NRZ_MSB, VBI_PIXFMT_UYVY);
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if (vbi_bit_slice(&slicer, src, tgt + 4) == FALSE)
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return -1;
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tgt[0] = 0x02; // data_unit_id
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tgt[1] = 0x2c; // data_unit_length
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tgt[2] = calc_parity_and_line_offset(line); // field_parity, line_offset
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tgt[3] = 0xe4; // framing code
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return 0;
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}
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#endif
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static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q)
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{
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memset(q, 0, sizeof(AVPacketQueue));
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pthread_mutex_init(&q->mutex, NULL);
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pthread_cond_init(&q->cond, NULL);
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q->avctx = avctx;
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}
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static void avpacket_queue_flush(AVPacketQueue *q)
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{
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AVPacketList *pkt, *pkt1;
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pthread_mutex_lock(&q->mutex);
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for (pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
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pkt1 = pkt->next;
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av_packet_unref(&pkt->pkt);
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av_freep(&pkt);
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}
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q->last_pkt = NULL;
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q->first_pkt = NULL;
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q->nb_packets = 0;
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q->size = 0;
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pthread_mutex_unlock(&q->mutex);
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}
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static void avpacket_queue_end(AVPacketQueue *q)
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{
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avpacket_queue_flush(q);
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pthread_mutex_destroy(&q->mutex);
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pthread_cond_destroy(&q->cond);
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}
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static unsigned long long avpacket_queue_size(AVPacketQueue *q)
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{
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unsigned long long size;
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pthread_mutex_lock(&q->mutex);
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size = q->size;
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pthread_mutex_unlock(&q->mutex);
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return size;
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}
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static int avpacket_queue_put(AVPacketQueue *q, AVPacket *pkt)
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{
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AVPacketList *pkt1;
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// Drop Packet if queue size is > 1GB
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if (avpacket_queue_size(q) > 1024 * 1024 * 1024 ) {
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av_log(q->avctx, AV_LOG_WARNING, "Decklink input buffer overrun!\n");
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return -1;
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}
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/* duplicate the packet */
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if (av_dup_packet(pkt) < 0) {
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return -1;
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}
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pkt1 = (AVPacketList *)av_malloc(sizeof(AVPacketList));
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if (!pkt1) {
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return -1;
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}
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pkt1->pkt = *pkt;
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pkt1->next = NULL;
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pthread_mutex_lock(&q->mutex);
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if (!q->last_pkt) {
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q->first_pkt = pkt1;
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} else {
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q->last_pkt->next = pkt1;
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}
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q->last_pkt = pkt1;
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q->nb_packets++;
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q->size += pkt1->pkt.size + sizeof(*pkt1);
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pthread_cond_signal(&q->cond);
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pthread_mutex_unlock(&q->mutex);
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return 0;
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}
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static int avpacket_queue_get(AVPacketQueue *q, AVPacket *pkt, int block)
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{
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AVPacketList *pkt1;
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int ret;
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pthread_mutex_lock(&q->mutex);
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for (;; ) {
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pkt1 = q->first_pkt;
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if (pkt1) {
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q->first_pkt = pkt1->next;
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if (!q->first_pkt) {
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q->last_pkt = NULL;
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}
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q->nb_packets--;
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q->size -= pkt1->pkt.size + sizeof(*pkt1);
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*pkt = pkt1->pkt;
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av_free(pkt1);
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ret = 1;
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break;
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} else if (!block) {
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ret = 0;
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break;
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} else {
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pthread_cond_wait(&q->cond, &q->mutex);
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}
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}
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pthread_mutex_unlock(&q->mutex);
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return ret;
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}
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class decklink_input_callback : public IDeckLinkInputCallback
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{
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public:
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decklink_input_callback(AVFormatContext *_avctx);
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~decklink_input_callback();
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virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
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virtual ULONG STDMETHODCALLTYPE AddRef(void);
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virtual ULONG STDMETHODCALLTYPE Release(void);
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virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags);
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virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);
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private:
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ULONG m_refCount;
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pthread_mutex_t m_mutex;
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AVFormatContext *avctx;
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decklink_ctx *ctx;
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int no_video;
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int64_t initial_video_pts;
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int64_t initial_audio_pts;
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};
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decklink_input_callback::decklink_input_callback(AVFormatContext *_avctx) : m_refCount(0)
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{
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avctx = _avctx;
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decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
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ctx = (struct decklink_ctx *)cctx->ctx;
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initial_audio_pts = initial_video_pts = AV_NOPTS_VALUE;
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pthread_mutex_init(&m_mutex, NULL);
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}
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decklink_input_callback::~decklink_input_callback()
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{
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pthread_mutex_destroy(&m_mutex);
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}
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ULONG decklink_input_callback::AddRef(void)
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{
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pthread_mutex_lock(&m_mutex);
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m_refCount++;
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pthread_mutex_unlock(&m_mutex);
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return (ULONG)m_refCount;
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}
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ULONG decklink_input_callback::Release(void)
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{
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pthread_mutex_lock(&m_mutex);
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m_refCount--;
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pthread_mutex_unlock(&m_mutex);
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if (m_refCount == 0) {
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delete this;
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return 0;
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}
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return (ULONG)m_refCount;
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}
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static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
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IDeckLinkAudioInputPacket *audioFrame,
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int64_t wallclock,
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DecklinkPtsSource pts_src,
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AVRational time_base, int64_t *initial_pts)
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{
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int64_t pts = AV_NOPTS_VALUE;
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BMDTimeValue bmd_pts;
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BMDTimeValue bmd_duration;
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HRESULT res = E_INVALIDARG;
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switch (pts_src) {
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case PTS_SRC_AUDIO:
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if (audioFrame)
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res = audioFrame->GetPacketTime(&bmd_pts, time_base.den);
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break;
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case PTS_SRC_VIDEO:
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if (videoFrame)
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res = videoFrame->GetStreamTime(&bmd_pts, &bmd_duration, time_base.den);
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break;
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case PTS_SRC_REFERENCE:
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if (videoFrame)
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res = videoFrame->GetHardwareReferenceTimestamp(time_base.den, &bmd_pts, &bmd_duration);
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break;
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case PTS_SRC_WALLCLOCK:
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pts = av_rescale_q(wallclock, AV_TIME_BASE_Q, time_base);
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break;
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}
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if (res == S_OK)
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pts = bmd_pts / time_base.num;
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if (pts != AV_NOPTS_VALUE && *initial_pts == AV_NOPTS_VALUE)
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*initial_pts = pts;
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if (*initial_pts != AV_NOPTS_VALUE)
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pts -= *initial_pts;
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return pts;
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}
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HRESULT decklink_input_callback::VideoInputFrameArrived(
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IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
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{
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void *frameBytes;
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void *audioFrameBytes;
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BMDTimeValue frameTime;
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BMDTimeValue frameDuration;
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int64_t wallclock = 0;
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ctx->frameCount++;
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if (ctx->audio_pts_source == PTS_SRC_WALLCLOCK || ctx->video_pts_source == PTS_SRC_WALLCLOCK)
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wallclock = av_gettime_relative();
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// Handle Video Frame
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if (videoFrame) {
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AVPacket pkt;
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av_init_packet(&pkt);
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if (ctx->frameCount % 25 == 0) {
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unsigned long long qsize = avpacket_queue_size(&ctx->queue);
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av_log(avctx, AV_LOG_DEBUG,
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"Frame received (#%lu) - Valid (%liB) - QSize %fMB\n",
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ctx->frameCount,
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videoFrame->GetRowBytes() * videoFrame->GetHeight(),
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(double)qsize / 1024 / 1024);
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}
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videoFrame->GetBytes(&frameBytes);
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videoFrame->GetStreamTime(&frameTime, &frameDuration,
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ctx->video_st->time_base.den);
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if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
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if (ctx->draw_bars && videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {
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unsigned bars[8] = {
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0xEA80EA80, 0xD292D210, 0xA910A9A5, 0x90229035,
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0x6ADD6ACA, 0x51EF515A, 0x286D28EF, 0x10801080 };
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int width = videoFrame->GetWidth();
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int height = videoFrame->GetHeight();
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unsigned *p = (unsigned *)frameBytes;
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x += 2)
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*p++ = bars[(x * 8) / width];
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}
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}
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if (!no_video) {
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av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - No input signal detected "
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"- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
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}
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no_video = 1;
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} else {
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if (no_video) {
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av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - Input returned "
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"- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
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}
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no_video = 0;
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}
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pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->video_pts_source, ctx->video_st->time_base, &initial_video_pts);
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pkt.dts = pkt.pts;
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pkt.duration = frameDuration;
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//To be made sure it still applies
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pkt.flags |= AV_PKT_FLAG_KEY;
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pkt.stream_index = ctx->video_st->index;
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pkt.data = (uint8_t *)frameBytes;
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pkt.size = videoFrame->GetRowBytes() *
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videoFrame->GetHeight();
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//fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts);
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#if CONFIG_LIBZVBI
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if (!no_video && ctx->teletext_lines && videoFrame->GetPixelFormat() == bmdFormat8BitYUV && videoFrame->GetWidth() == 720) {
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IDeckLinkVideoFrameAncillary *vanc;
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AVPacket txt_pkt;
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uint8_t txt_buf0[1611]; // max 35 * 46 bytes decoded teletext lines + 1 byte data_identifier
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uint8_t *txt_buf = txt_buf0;
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if (videoFrame->GetAncillaryData(&vanc) == S_OK) {
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int i;
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int64_t line_mask = 1;
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txt_buf[0] = 0x10; // data_identifier - EBU_data
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txt_buf++;
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for (i = 6; i < 336; i++, line_mask <<= 1) {
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uint8_t *buf;
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if ((ctx->teletext_lines & line_mask) && vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) {
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if (teletext_data_unit_from_vbi_data(i, buf, txt_buf) >= 0)
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txt_buf += 46;
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}
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if (i == 22)
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i = 317;
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}
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vanc->Release();
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if (txt_buf - txt_buf0 > 1) {
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int stuffing_units = (4 - ((45 + txt_buf - txt_buf0) / 46) % 4) % 4;
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while (stuffing_units--) {
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memset(txt_buf, 0xff, 46);
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txt_buf[1] = 0x2c; // data_unit_length
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txt_buf += 46;
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}
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av_init_packet(&txt_pkt);
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txt_pkt.pts = pkt.pts;
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txt_pkt.dts = pkt.dts;
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txt_pkt.stream_index = ctx->teletext_st->index;
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txt_pkt.data = txt_buf0;
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txt_pkt.size = txt_buf - txt_buf0;
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if (avpacket_queue_put(&ctx->queue, &txt_pkt) < 0) {
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++ctx->dropped;
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}
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}
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}
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}
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#endif
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if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
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++ctx->dropped;
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}
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}
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// Handle Audio Frame
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if (audioFrame) {
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AVPacket pkt;
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BMDTimeValue audio_pts;
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av_init_packet(&pkt);
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//hack among hacks
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pkt.size = audioFrame->GetSampleFrameCount() * ctx->audio_st->codecpar->channels * (16 / 8);
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audioFrame->GetBytes(&audioFrameBytes);
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audioFrame->GetPacketTime(&audio_pts, ctx->audio_st->time_base.den);
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pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->audio_pts_source, ctx->audio_st->time_base, &initial_audio_pts);
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pkt.dts = pkt.pts;
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//fprintf(stderr,"Audio Frame size %d ts %d\n", pkt.size, pkt.pts);
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pkt.flags |= AV_PKT_FLAG_KEY;
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pkt.stream_index = ctx->audio_st->index;
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pkt.data = (uint8_t *)audioFrameBytes;
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if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
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++ctx->dropped;
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}
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}
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return S_OK;
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}
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HRESULT decklink_input_callback::VideoInputFormatChanged(
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BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode,
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BMDDetectedVideoInputFormatFlags)
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{
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return S_OK;
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}
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static HRESULT decklink_start_input(AVFormatContext *avctx)
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{
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struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
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struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
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ctx->input_callback = new decklink_input_callback(avctx);
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ctx->dli->SetCallback(ctx->input_callback);
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return ctx->dli->StartStreams();
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}
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extern "C" {
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av_cold int ff_decklink_read_close(AVFormatContext *avctx)
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{
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struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
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struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
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if (ctx->capture_started) {
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ctx->dli->StopStreams();
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ctx->dli->DisableVideoInput();
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ctx->dli->DisableAudioInput();
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}
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ff_decklink_cleanup(avctx);
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avpacket_queue_end(&ctx->queue);
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av_freep(&cctx->ctx);
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return 0;
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}
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av_cold int ff_decklink_read_header(AVFormatContext *avctx)
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{
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struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
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struct decklink_ctx *ctx;
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AVStream *st;
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HRESULT result;
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char fname[1024];
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char *tmp;
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int mode_num = 0;
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int ret;
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ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
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if (!ctx)
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return AVERROR(ENOMEM);
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ctx->list_devices = cctx->list_devices;
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ctx->list_formats = cctx->list_formats;
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ctx->teletext_lines = cctx->teletext_lines;
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ctx->preroll = cctx->preroll;
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ctx->duplex_mode = cctx->duplex_mode;
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if (cctx->video_input > 0 && (unsigned int)cctx->video_input < FF_ARRAY_ELEMS(decklink_video_connection_map))
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ctx->video_input = decklink_video_connection_map[cctx->video_input];
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if (cctx->audio_input > 0 && (unsigned int)cctx->audio_input < FF_ARRAY_ELEMS(decklink_audio_connection_map))
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ctx->audio_input = decklink_audio_connection_map[cctx->audio_input];
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ctx->audio_pts_source = cctx->audio_pts_source;
|
|
ctx->video_pts_source = cctx->video_pts_source;
|
|
ctx->draw_bars = cctx->draw_bars;
|
|
cctx->ctx = ctx;
|
|
|
|
#if !CONFIG_LIBZVBI
|
|
if (ctx->teletext_lines) {
|
|
av_log(avctx, AV_LOG_ERROR, "Libzvbi support is needed for capturing teletext, please recompile FFmpeg.\n");
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
#endif
|
|
|
|
/* Check audio channel option for valid values: 2, 8 or 16 */
|
|
switch (cctx->audio_channels) {
|
|
case 2:
|
|
case 8:
|
|
case 16:
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Value of channels option must be one of 2, 8 or 16\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* List available devices. */
|
|
if (ctx->list_devices) {
|
|
ff_decklink_list_devices(avctx);
|
|
return AVERROR_EXIT;
|
|
}
|
|
|
|
strcpy (fname, avctx->filename);
|
|
tmp=strchr (fname, '@');
|
|
if (tmp != NULL) {
|
|
mode_num = atoi (tmp+1);
|
|
*tmp = 0;
|
|
}
|
|
|
|
ret = ff_decklink_init_device(avctx, fname);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Get input device. */
|
|
if (ctx->dl->QueryInterface(IID_IDeckLinkInput, (void **) &ctx->dli) != S_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not open input device from '%s'\n",
|
|
avctx->filename);
|
|
ret = AVERROR(EIO);
|
|
goto error;
|
|
}
|
|
|
|
/* List supported formats. */
|
|
if (ctx->list_formats) {
|
|
ff_decklink_list_formats(avctx, DIRECTION_IN);
|
|
ret = AVERROR_EXIT;
|
|
goto error;
|
|
}
|
|
|
|
if (mode_num > 0) {
|
|
if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not set mode %d for %s\n", mode_num, fname);
|
|
ret = AVERROR(EIO);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Setup streams. */
|
|
st = avformat_new_stream(avctx, NULL);
|
|
if (!st) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
|
|
st->codecpar->sample_rate = bmdAudioSampleRate48kHz;
|
|
st->codecpar->channels = cctx->audio_channels;
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
ctx->audio_st=st;
|
|
|
|
st = avformat_new_stream(avctx, NULL);
|
|
if (!st) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->width = ctx->bmd_width;
|
|
st->codecpar->height = ctx->bmd_height;
|
|
|
|
st->time_base.den = ctx->bmd_tb_den;
|
|
st->time_base.num = ctx->bmd_tb_num;
|
|
av_stream_set_r_frame_rate(st, av_make_q(st->time_base.den, st->time_base.num));
|
|
|
|
if (cctx->v210) {
|
|
st->codecpar->codec_id = AV_CODEC_ID_V210;
|
|
st->codecpar->codec_tag = MKTAG('V', '2', '1', '0');
|
|
st->codecpar->bit_rate = av_rescale(ctx->bmd_width * ctx->bmd_height * 64, st->time_base.den, st->time_base.num * 3);
|
|
} else {
|
|
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
|
|
st->codecpar->format = AV_PIX_FMT_UYVY422;
|
|
st->codecpar->codec_tag = MKTAG('U', 'Y', 'V', 'Y');
|
|
st->codecpar->bit_rate = av_rescale(ctx->bmd_width * ctx->bmd_height * 16, st->time_base.den, st->time_base.num);
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
|
|
ctx->video_st=st;
|
|
|
|
if (ctx->teletext_lines) {
|
|
st = avformat_new_stream(avctx, NULL);
|
|
if (!st) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->time_base.den = ctx->bmd_tb_den;
|
|
st->time_base.num = ctx->bmd_tb_num;
|
|
st->codecpar->codec_id = AV_CODEC_ID_DVB_TELETEXT;
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
ctx->teletext_st = st;
|
|
}
|
|
|
|
av_log(avctx, AV_LOG_VERBOSE, "Using %d input audio channels\n", ctx->audio_st->codecpar->channels);
|
|
result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, ctx->audio_st->codecpar->channels);
|
|
|
|
if (result != S_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot enable audio input\n");
|
|
ret = AVERROR(EIO);
|
|
goto error;
|
|
}
|
|
|
|
result = ctx->dli->EnableVideoInput(ctx->bmd_mode,
|
|
cctx->v210 ? bmdFormat10BitYUV : bmdFormat8BitYUV,
|
|
bmdVideoInputFlagDefault);
|
|
|
|
if (result != S_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot enable video input\n");
|
|
ret = AVERROR(EIO);
|
|
goto error;
|
|
}
|
|
|
|
avpacket_queue_init (avctx, &ctx->queue);
|
|
|
|
if (decklink_start_input (avctx) != S_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot start input stream\n");
|
|
ret = AVERROR(EIO);
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
ff_decklink_cleanup(avctx);
|
|
return ret;
|
|
}
|
|
|
|
int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt)
|
|
{
|
|
struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
|
|
struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
|
|
AVFrame *frame = ctx->video_st->codec->coded_frame;
|
|
|
|
avpacket_queue_get(&ctx->queue, pkt, 1);
|
|
if (frame && (ctx->bmd_field_dominance == bmdUpperFieldFirst || ctx->bmd_field_dominance == bmdLowerFieldFirst)) {
|
|
frame->interlaced_frame = 1;
|
|
if (ctx->bmd_field_dominance == bmdUpperFieldFirst) {
|
|
frame->top_field_first = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
} /* extern "C" */
|