static int ndi_write_header(AVFormatContext *avctx)
{
int ret = 0;
unsigned int n;
struct NDIContext *ctx = avctx->priv_data;
const NDIlib_send_create_t ndi_send_desc = { .p_ndi_name = avctx->filename,
.p_groups = NULL, .clock_video = ctx->clock_video, .clock_audio = ctx->clock_audio };
if (!NDIlib_initialize()) {
av_log(avctx, AV_LOG_ERROR, "NDIlib_initialize failed.\n");
return AVERROR_EXTERNAL;
}
/* check if streams compatible */
for (n = 0; n < avctx->nb_streams; n++) {
AVStream *st = avctx->streams[n];
AVCodecParameters *c = st->codecpar;
if (c->codec_type == AVMEDIA_TYPE_AUDIO) {
if ((ret = ndi_setup_audio(avctx, st)))
goto error;
} else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {
if ((ret = ndi_setup_video(avctx, st)))
goto error;
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");
ret = AVERROR(EINVAL);
goto error;
}
}
ctx->ndi_send = NDIlib_send_create(&ndi_send_desc);
if (!ctx->ndi_send) {
av_log(avctx, AV_LOG_ERROR, "Failed to create NDI output %s\n", avctx->filename);
ret = AVERROR_EXTERNAL;
}
error:
return ret;
}
#define OFFSET(x) offsetof(struct NDIContext, x)
static const AVOption options[] = {
{ "reference_level", "The audio reference level in dB" , OFFSET(reference_level), AV_OPT_TYPE_INT, { .i64 = 0 }, -20, 20, AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM},
int _tmain(int argc, _TCHAR* argv[])
{ // Not required, but "correct" (see the SDK documentation.
if (!NDIlib_initialize())
{ // Cannot run NDI. Most likely because the CPU is not sufficient (see SDK documentation).
// you can check this directly with a call to NDIlib_is_supported_CPU()
printf("Cannot run NDI.");
return 0;
}
// We are going to create an NDI finder that locates sources on the network.
// including ones that are available on this machine itself. It will use the default
// groups assigned for the current machine.
const NDIlib_find_create_t NDI_find_create_desc = { TRUE, NULL };
// We create the NDI finder
NDIlib_find_instance_t pNDI_find = NDIlib_find_create(&NDI_find_create_desc);
if (!pNDI_find) return FALSE;
// Run for one minute
for (DWORD start = ::GetTickCount(); ::GetTickCount() - start < 60000;)
{ // Wait up till 10 seconds to check for new sources having been added or removed from the network.
// Because we have specified a non zero timeout here, this will return NULL if there have been no changes.
DWORD no_sources = 0;
const NDIlib_source_t* p_sources = NDIlib_find_get_sources(pNDI_find, &no_sources, 10000);
// If it returned NULL then where where no changes on the network. If we have specified a timeout of 0,
// then it always returns all sources on the network.
if (!p_sources) continue;
// Display all the sources.
printf("Network sources (%u found).\n", no_sources);
for (DWORD i = 0; i < no_sources; i++)
printf("%d. %s\n", i + 1, p_sources[i].p_ndi_name);
}
// Destroy the NDI finder
NDIlib_find_destroy(pNDI_find);
// Success. We are done
return 0;
}
static int ndi_find_sources(AVFormatContext *avctx, const char *name, NDIlib_source_t *source_to_connect_to)
{
int j = AVERROR(ENODEV);
unsigned int n, i;
struct NDIContext *ctx = avctx->priv_data;
const NDIlib_source_t *ndi_srcs = NULL;
const NDIlib_find_create_t find_create_desc = { .show_local_sources = true,
.p_groups = NULL, .p_extra_ips = NULL };
if (!ctx->ndi_find)
ctx->ndi_find = NDIlib_find_create2(&find_create_desc);
if (!ctx->ndi_find) {
av_log(avctx, AV_LOG_ERROR, "NDIlib_find_create failed.\n");
return AVERROR(EIO);
}
while (1)
{
int f, t = ctx->wait_sources / 1000;
av_log(avctx, AV_LOG_DEBUG, "Waiting for sources %d miliseconds\n", t);
f = NDIlib_find_wait_for_sources(ctx->ndi_find, t);
av_log(avctx, AV_LOG_DEBUG, "NDIlib_find_wait_for_sources returns %d\n", f);
if (!f)
break;
};
ndi_srcs = NDIlib_find_get_current_sources(ctx->ndi_find, &n);
if (ctx->find_sources)
av_log(avctx, AV_LOG_INFO, "Found %d NDI sources:\n", n);
for (i = 0; i < n; i++) {
if (ctx->find_sources)
av_log(avctx, AV_LOG_INFO, "\t'%s'\t'%s'\n", ndi_srcs[i].p_ndi_name, ndi_srcs[i].p_ip_address);
if (!strcmp(name, ndi_srcs[i].p_ndi_name)) {
*source_to_connect_to = ndi_srcs[i];
j = i;
}
}
return j;
}
static int ndi_read_header(AVFormatContext *avctx)
{
int ret;
NDIlib_recv_create_t recv_create_desc;
const NDIlib_tally_t tally_state = { .on_program = true, .on_preview = false };
struct NDIContext *ctx = avctx->priv_data;
if (!NDIlib_initialize()) {
av_log(avctx, AV_LOG_ERROR, "NDIlib_initialize failed.\n");
return AVERROR_EXTERNAL;
}
/* Find available sources. */
ret = ndi_find_sources(avctx, avctx->url, &recv_create_desc.source_to_connect_to);
if (ctx->find_sources) {
return AVERROR_EXIT;
}
if (ret < 0)
return ret;
/* Create receiver description */
recv_create_desc.color_format = NDIlib_recv_color_format_e_UYVY_RGBA;
recv_create_desc.bandwidth = NDIlib_recv_bandwidth_highest;
recv_create_desc.allow_video_fields = ctx->allow_video_fields;
/* Create the receiver */
ctx->recv = NDIlib_recv_create(&recv_create_desc);
if (!ctx->recv) {
av_log(avctx, AV_LOG_ERROR, "NDIlib_recv_create2 failed.\n");
return AVERROR(EIO);
}
/* Set tally */
NDIlib_recv_set_tally(ctx->recv, &tally_state);
avctx->ctx_flags |= AVFMTCTX_NOHEADER;
return 0;
}
static int ndi_create_video_stream(AVFormatContext *avctx, NDIlib_video_frame_t *v)
{
AVStream *st;
AVRational tmp;
struct NDIContext *ctx = avctx->priv_data;
st = avformat_new_stream(avctx, NULL);
if (!st) {
av_log(avctx, AV_LOG_ERROR, "Cannot add video stream\n");
return AVERROR(ENOMEM);
}
st->time_base = NDI_TIME_BASE_Q;
st->r_frame_rate = av_make_q(v->frame_rate_N, v->frame_rate_D);
tmp = av_mul_q(av_d2q(v->picture_aspect_ratio, INT_MAX), (AVRational){v->yres, v->xres});
av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den, tmp.num, tmp.den, 1000);
st->codecpar->sample_aspect_ratio = st->sample_aspect_ratio;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->width = v->xres;
st->codecpar->height = v->yres;
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
st->codecpar->bit_rate = av_rescale(v->xres * v->yres * 16, v->frame_rate_N, v->frame_rate_D);
st->codecpar->field_order = v->frame_format_type == NDIlib_frame_format_type_progressive
? AV_FIELD_PROGRESSIVE : AV_FIELD_TT;
if (NDIlib_FourCC_type_UYVY == v->FourCC || NDIlib_FourCC_type_UYVA == v->FourCC) {
st->codecpar->format = AV_PIX_FMT_UYVY422;
st->codecpar->codec_tag = MKTAG('U', 'Y', 'V', 'Y');
if (NDIlib_FourCC_type_UYVA == v->FourCC)
av_log(avctx, AV_LOG_WARNING, "Alpha channel ignored\n");
} else if (NDIlib_FourCC_type_BGRA == v->FourCC) {
st->codecpar->format = AV_PIX_FMT_BGRA;
st->codecpar->codec_tag = MKTAG('B', 'G', 'R', 'A');
} else if (NDIlib_FourCC_type_BGRX == v->FourCC) {
st->codecpar->format = AV_PIX_FMT_BGR0;
st->codecpar->codec_tag = MKTAG('B', 'G', 'R', '0');
} else if (NDIlib_FourCC_type_RGBA == v->FourCC) {
st->codecpar->format = AV_PIX_FMT_RGBA;
st->codecpar->codec_tag = MKTAG('R', 'G', 'B', 'A');
} else if (NDIlib_FourCC_type_RGBX == v->FourCC) {
st->codecpar->format = AV_PIX_FMT_RGB0;
st->codecpar->codec_tag = MKTAG('R', 'G', 'B', '0');
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported video stream format, v->FourCC=%d\n", v->FourCC);
return AVERROR(EINVAL);
}
avpriv_set_pts_info(st, 64, 1, NDI_TIME_BASE);
ctx->video_st = st;
return 0;
}