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FFmpeg/libavdevice/decklink_dec.cpp
Aaron Levinson 7f7ee86d5a avdevice/decklink: fix MSVC build issues 
Purpose: Made minor changes to get the decklink avdevice code to build
using Visual C++.

Notes: Made changes to configure per Hendrik Leppkes's review of first
and second versions of patch.  Also made slight alterations per Marton
Balint's reviews.

Comments:

-- configure: Added if enabled decklink section and setting
   decklink_indev_extralibs and decklink_outdev_extralibs here for
   both mingw and Windows.  Also eliminated the setting of these
   variables in the mingw section earlier in the file.

-- libavdevice/decklink_common.cpp: Switched the order of the include
   of libavformat/internal.h to workaround build issues with Visual
   C++.  See comment in file for more details.

-- libavdevice/decklink_dec.cpp:
a) Rearranged the include of libavformat/internal.h (for reasons as
   described above).
b) Made slight alteration to an argument for call to av_rescale_q() to
   workaround a compiler error with Visual C++.  This appears to only
   be an issue when building C++ files with Visual C++.  See comment
   in code for more details.

-- libavdevice/decklink_enc.cpp: Rearranged the include of
   libavformat/internal.h (for reasons as described above).

Signed-off-by: Aaron Levinson <alevinsn@aracnet.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
2017-05-08 22:43:35 +02:00

671 lines
21 KiB
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/*
* Blackmagic DeckLink input
* Copyright (c) 2013-2014 Luca Barbato, Deti Fliegl
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* 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" {
#include "libavformat/internal.h"
}
#include <DeckLinkAPI.h>
extern "C" {
#include "config.h"
#include "libavformat/avformat.h"
#include "libavutil/avutil.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/time.h"
#include "libavutil/mathematics.h"
#if CONFIG_LIBZVBI
#include <libzvbi.h>
#endif
}
#include "decklink_common.h"
#include "decklink_dec.h"
#if CONFIG_LIBZVBI
static uint8_t calc_parity_and_line_offset(int line)
{
uint8_t ret = (line < 313) << 5;
if (line >= 7 && line <= 22)
ret += line;
if (line >= 320 && line <= 335)
ret += (line - 313);
return ret;
}
int teletext_data_unit_from_vbi_data(int line, uint8_t *src, uint8_t *tgt)
{
vbi_bit_slicer slicer;
vbi_bit_slicer_init(&slicer, 720, 13500000, 6937500, 6937500, 0x00aaaae4, 0xffff, 18, 6, 42 * 8, VBI_MODULATION_NRZ_MSB, VBI_PIXFMT_UYVY);
if (vbi_bit_slice(&slicer, src, tgt + 4) == FALSE)
return -1;
tgt[0] = 0x02; // data_unit_id
tgt[1] = 0x2c; // data_unit_length
tgt[2] = calc_parity_and_line_offset(line); // field_parity, line_offset
tgt[3] = 0xe4; // framing code
return 0;
}
#endif
static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q)
{
memset(q, 0, sizeof(AVPacketQueue));
pthread_mutex_init(&q->mutex, NULL);
pthread_cond_init(&q->cond, NULL);
q->avctx = avctx;
}
static void avpacket_queue_flush(AVPacketQueue *q)
{
AVPacketList *pkt, *pkt1;
pthread_mutex_lock(&q->mutex);
for (pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
pkt1 = pkt->next;
av_packet_unref(&pkt->pkt);
av_freep(&pkt);
}
q->last_pkt = NULL;
q->first_pkt = NULL;
q->nb_packets = 0;
q->size = 0;
pthread_mutex_unlock(&q->mutex);
}
static void avpacket_queue_end(AVPacketQueue *q)
{
avpacket_queue_flush(q);
pthread_mutex_destroy(&q->mutex);
pthread_cond_destroy(&q->cond);
}
static unsigned long long avpacket_queue_size(AVPacketQueue *q)
{
unsigned long long size;
pthread_mutex_lock(&q->mutex);
size = q->size;
pthread_mutex_unlock(&q->mutex);
return size;
}
static int avpacket_queue_put(AVPacketQueue *q, AVPacket *pkt)
{
AVPacketList *pkt1;
// Drop Packet if queue size is > 1GB
if (avpacket_queue_size(q) > 1024 * 1024 * 1024 ) {
av_log(q->avctx, AV_LOG_WARNING, "Decklink input buffer overrun!\n");
return -1;
}
/* duplicate the packet */
if (av_dup_packet(pkt) < 0) {
return -1;
}
pkt1 = (AVPacketList *)av_malloc(sizeof(AVPacketList));
if (!pkt1) {
return -1;
}
pkt1->pkt = *pkt;
pkt1->next = NULL;
pthread_mutex_lock(&q->mutex);
if (!q->last_pkt) {
q->first_pkt = pkt1;
} else {
q->last_pkt->next = pkt1;
}
q->last_pkt = pkt1;
q->nb_packets++;
q->size += pkt1->pkt.size + sizeof(*pkt1);
pthread_cond_signal(&q->cond);
pthread_mutex_unlock(&q->mutex);
return 0;
}
static int avpacket_queue_get(AVPacketQueue *q, AVPacket *pkt, int block)
{
AVPacketList *pkt1;
int ret;
pthread_mutex_lock(&q->mutex);
for (;; ) {
pkt1 = q->first_pkt;
if (pkt1) {
q->first_pkt = pkt1->next;
if (!q->first_pkt) {
q->last_pkt = NULL;
}
q->nb_packets--;
q->size -= pkt1->pkt.size + sizeof(*pkt1);
*pkt = pkt1->pkt;
av_free(pkt1);
ret = 1;
break;
} else if (!block) {
ret = 0;
break;
} else {
pthread_cond_wait(&q->cond, &q->mutex);
}
}
pthread_mutex_unlock(&q->mutex);
return ret;
}
class decklink_input_callback : public IDeckLinkInputCallback
{
public:
decklink_input_callback(AVFormatContext *_avctx);
~decklink_input_callback();
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
virtual ULONG STDMETHODCALLTYPE AddRef(void);
virtual ULONG STDMETHODCALLTYPE Release(void);
virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags);
virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);
private:
ULONG m_refCount;
pthread_mutex_t m_mutex;
AVFormatContext *avctx;
decklink_ctx *ctx;
int no_video;
int64_t initial_video_pts;
int64_t initial_audio_pts;
};
decklink_input_callback::decklink_input_callback(AVFormatContext *_avctx) : m_refCount(0)
{
avctx = _avctx;
decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
ctx = (struct decklink_ctx *)cctx->ctx;
no_video = 0;
initial_audio_pts = initial_video_pts = AV_NOPTS_VALUE;
pthread_mutex_init(&m_mutex, NULL);
}
decklink_input_callback::~decklink_input_callback()
{
pthread_mutex_destroy(&m_mutex);
}
ULONG decklink_input_callback::AddRef(void)
{
pthread_mutex_lock(&m_mutex);
m_refCount++;
pthread_mutex_unlock(&m_mutex);
return (ULONG)m_refCount;
}
ULONG decklink_input_callback::Release(void)
{
pthread_mutex_lock(&m_mutex);
m_refCount--;
pthread_mutex_unlock(&m_mutex);
if (m_refCount == 0) {
delete this;
return 0;
}
return (ULONG)m_refCount;
}
static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
IDeckLinkAudioInputPacket *audioFrame,
int64_t wallclock,
DecklinkPtsSource pts_src,
AVRational time_base, int64_t *initial_pts)
{
int64_t pts = AV_NOPTS_VALUE;
BMDTimeValue bmd_pts;
BMDTimeValue bmd_duration;
HRESULT res = E_INVALIDARG;
switch (pts_src) {
case PTS_SRC_AUDIO:
if (audioFrame)
res = audioFrame->GetPacketTime(&bmd_pts, time_base.den);
break;
case PTS_SRC_VIDEO:
if (videoFrame)
res = videoFrame->GetStreamTime(&bmd_pts, &bmd_duration, time_base.den);
break;
case PTS_SRC_REFERENCE:
if (videoFrame)
res = videoFrame->GetHardwareReferenceTimestamp(time_base.den, &bmd_pts, &bmd_duration);
break;
case PTS_SRC_WALLCLOCK:
{
/* MSVC does not support compound literals like AV_TIME_BASE_Q
* in C++ code (compiler error C4576) */
AVRational timebase;
timebase.num = 1;
timebase.den = AV_TIME_BASE;
pts = av_rescale_q(wallclock, timebase, time_base);
break;
}
}
if (res == S_OK)
pts = bmd_pts / time_base.num;
if (pts != AV_NOPTS_VALUE && *initial_pts == AV_NOPTS_VALUE)
*initial_pts = pts;
if (*initial_pts != AV_NOPTS_VALUE)
pts -= *initial_pts;
return pts;
}
HRESULT decklink_input_callback::VideoInputFrameArrived(
IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
{
void *frameBytes;
void *audioFrameBytes;
BMDTimeValue frameTime;
BMDTimeValue frameDuration;
int64_t wallclock = 0;
ctx->frameCount++;
if (ctx->audio_pts_source == PTS_SRC_WALLCLOCK || ctx->video_pts_source == PTS_SRC_WALLCLOCK)
wallclock = av_gettime_relative();
// Handle Video Frame
if (videoFrame) {
AVPacket pkt;
av_init_packet(&pkt);
if (ctx->frameCount % 25 == 0) {
unsigned long long qsize = avpacket_queue_size(&ctx->queue);
av_log(avctx, AV_LOG_DEBUG,
"Frame received (#%lu) - Valid (%liB) - QSize %fMB\n",
ctx->frameCount,
videoFrame->GetRowBytes() * videoFrame->GetHeight(),
(double)qsize / 1024 / 1024);
}
videoFrame->GetBytes(&frameBytes);
videoFrame->GetStreamTime(&frameTime, &frameDuration,
ctx->video_st->time_base.den);
if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
if (ctx->draw_bars && videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {
unsigned bars[8] = {
0xEA80EA80, 0xD292D210, 0xA910A9A5, 0x90229035,
0x6ADD6ACA, 0x51EF515A, 0x286D28EF, 0x10801080 };
int width = videoFrame->GetWidth();
int height = videoFrame->GetHeight();
unsigned *p = (unsigned *)frameBytes;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x += 2)
*p++ = bars[(x * 8) / width];
}
}
if (!no_video) {
av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - No input signal detected "
"- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
}
no_video = 1;
} else {
if (no_video) {
av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - Input returned "
"- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
}
no_video = 0;
}
pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->video_pts_source, ctx->video_st->time_base, &initial_video_pts);
pkt.dts = pkt.pts;
pkt.duration = frameDuration;
//To be made sure it still applies
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = ctx->video_st->index;
pkt.data = (uint8_t *)frameBytes;
pkt.size = videoFrame->GetRowBytes() *
videoFrame->GetHeight();
//fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts);
#if CONFIG_LIBZVBI
if (!no_video && ctx->teletext_lines && videoFrame->GetPixelFormat() == bmdFormat8BitYUV && videoFrame->GetWidth() == 720) {
IDeckLinkVideoFrameAncillary *vanc;
AVPacket txt_pkt;
uint8_t txt_buf0[1611]; // max 35 * 46 bytes decoded teletext lines + 1 byte data_identifier
uint8_t *txt_buf = txt_buf0;
if (videoFrame->GetAncillaryData(&vanc) == S_OK) {
int i;
int64_t line_mask = 1;
txt_buf[0] = 0x10; // data_identifier - EBU_data
txt_buf++;
for (i = 6; i < 336; i++, line_mask <<= 1) {
uint8_t *buf;
if ((ctx->teletext_lines & line_mask) && vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) {
if (teletext_data_unit_from_vbi_data(i, buf, txt_buf) >= 0)
txt_buf += 46;
}
if (i == 22)
i = 317;
}
vanc->Release();
if (txt_buf - txt_buf0 > 1) {
int stuffing_units = (4 - ((45 + txt_buf - txt_buf0) / 46) % 4) % 4;
while (stuffing_units--) {
memset(txt_buf, 0xff, 46);
txt_buf[1] = 0x2c; // data_unit_length
txt_buf += 46;
}
av_init_packet(&txt_pkt);
txt_pkt.pts = pkt.pts;
txt_pkt.dts = pkt.dts;
txt_pkt.stream_index = ctx->teletext_st->index;
txt_pkt.data = txt_buf0;
txt_pkt.size = txt_buf - txt_buf0;
if (avpacket_queue_put(&ctx->queue, &txt_pkt) < 0) {
++ctx->dropped;
}
}
}
}
#endif
if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
++ctx->dropped;
}
}
// Handle Audio Frame
if (audioFrame) {
AVPacket pkt;
BMDTimeValue audio_pts;
av_init_packet(&pkt);
//hack among hacks
pkt.size = audioFrame->GetSampleFrameCount() * ctx->audio_st->codecpar->channels * (16 / 8);
audioFrame->GetBytes(&audioFrameBytes);
audioFrame->GetPacketTime(&audio_pts, ctx->audio_st->time_base.den);
pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->audio_pts_source, ctx->audio_st->time_base, &initial_audio_pts);
pkt.dts = pkt.pts;
//fprintf(stderr,"Audio Frame size %d ts %d\n", pkt.size, pkt.pts);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = ctx->audio_st->index;
pkt.data = (uint8_t *)audioFrameBytes;
if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
++ctx->dropped;
}
}
return S_OK;
}
HRESULT decklink_input_callback::VideoInputFormatChanged(
BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode,
BMDDetectedVideoInputFormatFlags)
{
return S_OK;
}
static HRESULT decklink_start_input(AVFormatContext *avctx)
{
struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
ctx->input_callback = new decklink_input_callback(avctx);
ctx->dli->SetCallback(ctx->input_callback);
return ctx->dli->StartStreams();
}
extern "C" {
av_cold int ff_decklink_read_close(AVFormatContext *avctx)
{
struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
if (ctx->capture_started) {
ctx->dli->StopStreams();
ctx->dli->DisableVideoInput();
ctx->dli->DisableAudioInput();
}
ff_decklink_cleanup(avctx);
avpacket_queue_end(&ctx->queue);
av_freep(&cctx->ctx);
return 0;
}
av_cold int ff_decklink_read_header(AVFormatContext *avctx)
{
struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
struct decklink_ctx *ctx;
AVStream *st;
HRESULT result;
char fname[1024];
char *tmp;
int mode_num = 0;
int ret;
ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
if (!ctx)
return AVERROR(ENOMEM);
ctx->list_devices = cctx->list_devices;
ctx->list_formats = cctx->list_formats;
ctx->teletext_lines = cctx->teletext_lines;
ctx->preroll = cctx->preroll;
ctx->duplex_mode = cctx->duplex_mode;
if (cctx->video_input > 0 && (unsigned int)cctx->video_input < FF_ARRAY_ELEMS(decklink_video_connection_map))
ctx->video_input = decklink_video_connection_map[cctx->video_input];
if (cctx->audio_input > 0 && (unsigned int)cctx->audio_input < FF_ARRAY_ELEMS(decklink_audio_connection_map))
ctx->audio_input = decklink_audio_connection_map[cctx->audio_input];
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) {
av_log(avctx, AV_LOG_WARNING, "The @mode syntax is deprecated and will be removed. Please use the -format_code option.\n");
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 || cctx->format_code) {
if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not set mode number %d or format code %s for %s\n",
mode_num, (cctx->format_code) ? cctx->format_code : "(unset)", 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" */
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