mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 15:53:08 +00:00
lavd/decklink_dec: add support for teletext
It uses the libzvbi slicer, therefore teletext capture requires libzvbi. Reviewed-by: Deti Fliegl <deti@fliegl.de> Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
parent
98e94dff7a
commit
995c7a6f5a
@ -236,6 +236,16 @@ Defaults to @option{false}.
|
||||
If set to @samp{1}, video is captured in 10 bit v210 instead
|
||||
of uyvy422. Not all Blackmagic devices support this option.
|
||||
|
||||
@item teletext_lines
|
||||
If set to nonzero, an additional teletext stream will be captured from the
|
||||
vertical ancillary data. This option is a bitmask of the VBI lines checked,
|
||||
specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB in the mask.
|
||||
Selected lines which do not contain teletext information will be ignored. You
|
||||
can use the special @option{all} constant to select all possible lines, or
|
||||
@option{standard} to skip lines 6, 318 and 319, which are not compatible with all
|
||||
receivers. Capturing teletext only works for SD PAL sources in 8 bit mode.
|
||||
To use this option, ffmpeg needs to be compiled with @code{--enable-libzvbi}.
|
||||
|
||||
@end table
|
||||
|
||||
@subsection Examples
|
||||
|
||||
@ -67,10 +67,12 @@ struct decklink_ctx {
|
||||
unsigned int dropped;
|
||||
AVStream *audio_st;
|
||||
AVStream *video_st;
|
||||
AVStream *teletext_st;
|
||||
|
||||
/* Options */
|
||||
int list_devices;
|
||||
int list_formats;
|
||||
int64_t teletext_lines;
|
||||
double preroll;
|
||||
|
||||
int frames_preroll;
|
||||
|
||||
@ -27,6 +27,7 @@ struct decklink_cctx {
|
||||
/* Options */
|
||||
int list_devices;
|
||||
int list_formats;
|
||||
int64_t teletext_lines;
|
||||
double preroll;
|
||||
int v210;
|
||||
};
|
||||
|
||||
@ -25,14 +25,47 @@
|
||||
#include <semaphore.h>
|
||||
|
||||
extern "C" {
|
||||
#include "config.h"
|
||||
#include "libavformat/avformat.h"
|
||||
#include "libavformat/internal.h"
|
||||
#include "libavutil/imgutils.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));
|
||||
@ -277,6 +310,50 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
|
||||
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
|
||||
|
||||
c->frame_number++;
|
||||
if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
|
||||
++ctx->dropped;
|
||||
@ -378,9 +455,17 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
|
||||
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;
|
||||
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
|
||||
|
||||
iter = CreateDeckLinkIteratorInstance();
|
||||
if (!iter) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");
|
||||
@ -488,6 +573,20 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
|
||||
|
||||
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");
|
||||
goto error;
|
||||
}
|
||||
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
||||
st->codec->time_base.den = ctx->bmd_tb_den;
|
||||
st->codec->time_base.num = ctx->bmd_tb_num;
|
||||
st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
|
||||
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
||||
ctx->teletext_st = st;
|
||||
}
|
||||
|
||||
result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, 2);
|
||||
|
||||
if (result != S_OK) {
|
||||
|
||||
@ -32,6 +32,9 @@ static const AVOption options[] = {
|
||||
{ "list_devices", "list available devices" , OFFSET(list_devices), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
|
||||
{ "list_formats", "list supported formats" , OFFSET(list_formats), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
|
||||
{ "bm_v210", "v210 10 bit per channel" , OFFSET(v210), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
|
||||
{ "teletext_lines", "teletext lines bitmask", OFFSET(teletext_lines), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, 0x7ffffffffLL, DEC, "teletext_lines"},
|
||||
{ "standard", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0x7fff9fffeLL}, 0, 0, DEC, "teletext_lines"},
|
||||
{ "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0x7ffffffffLL}, 0, 0, DEC, "teletext_lines"},
|
||||
{ NULL },
|
||||
};
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
|
||||
#define LIBAVDEVICE_VERSION_MAJOR 57
|
||||
#define LIBAVDEVICE_VERSION_MINOR 0
|
||||
#define LIBAVDEVICE_VERSION_MICRO 100
|
||||
#define LIBAVDEVICE_VERSION_MICRO 101
|
||||
|
||||
#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
|
||||
LIBAVDEVICE_VERSION_MINOR, \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user