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>
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Marton Balint
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98e94dff7a
commit
995c7a6f5a
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@ -236,6 +236,16 @@ Defaults to @option{false}.
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If set to @samp{1}, video is captured in 10 bit v210 instead
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of uyvy422. Not all Blackmagic devices support this option.
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@item teletext_lines
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If set to nonzero, an additional teletext stream will be captured from the
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vertical ancillary data. This option is a bitmask of the VBI lines checked,
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specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB in the mask.
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Selected lines which do not contain teletext information will be ignored. You
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can use the special @option{all} constant to select all possible lines, or
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@option{standard} to skip lines 6, 318 and 319, which are not compatible with all
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receivers. Capturing teletext only works for SD PAL sources in 8 bit mode.
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To use this option, ffmpeg needs to be compiled with @code{--enable-libzvbi}.
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@end table
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@subsection Examples
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@ -67,10 +67,12 @@ struct decklink_ctx {
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unsigned int dropped;
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AVStream *audio_st;
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AVStream *video_st;
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AVStream *teletext_st;
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/* Options */
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int list_devices;
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int list_formats;
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int64_t teletext_lines;
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double preroll;
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int frames_preroll;
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@ -27,6 +27,7 @@ struct decklink_cctx {
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/* Options */
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int list_devices;
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int list_formats;
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int64_t teletext_lines;
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double preroll;
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int v210;
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};
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@ -25,14 +25,47 @@
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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/imgutils.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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@ -277,6 +310,50 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
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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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c->frame_number++;
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if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
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++ctx->dropped;
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@ -378,9 +455,17 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
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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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cctx->ctx = ctx;
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#if !CONFIG_LIBZVBI
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if (ctx->teletext_lines) {
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av_log(avctx, AV_LOG_ERROR, "Libzvbi support is needed for capturing teletext, please recompile FFmpeg.\n");
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return AVERROR(ENOSYS);
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}
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#endif
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iter = CreateDeckLinkIteratorInstance();
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if (!iter) {
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av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");
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@ -488,6 +573,20 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
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ctx->video_st=st;
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if (ctx->teletext_lines) {
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st = avformat_new_stream(avctx, NULL);
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if (!st) {
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av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
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goto error;
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}
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codec->time_base.den = ctx->bmd_tb_den;
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st->codec->time_base.num = ctx->bmd_tb_num;
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st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT;
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avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
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ctx->teletext_st = st;
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}
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result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, 2);
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if (result != S_OK) {
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@ -32,6 +32,9 @@ static const AVOption options[] = {
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{ "list_devices", "list available devices" , OFFSET(list_devices), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
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{ "list_formats", "list supported formats" , OFFSET(list_formats), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
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{ "bm_v210", "v210 10 bit per channel" , OFFSET(v210), AV_OPT_TYPE_INT , { .i64 = 0 }, 0, 1, DEC },
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{ "teletext_lines", "teletext lines bitmask", OFFSET(teletext_lines), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, 0x7ffffffffLL, DEC, "teletext_lines"},
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{ "standard", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0x7fff9fffeLL}, 0, 0, DEC, "teletext_lines"},
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{ "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0x7ffffffffLL}, 0, 0, DEC, "teletext_lines"},
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{ NULL },
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};
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@ -29,7 +29,7 @@
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#define LIBAVDEVICE_VERSION_MAJOR 57
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#define LIBAVDEVICE_VERSION_MINOR 0
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#define LIBAVDEVICE_VERSION_MICRO 100
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#define LIBAVDEVICE_VERSION_MICRO 101
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#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
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LIBAVDEVICE_VERSION_MINOR, \
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