It uses the libzvbi slicer, therefore teletext capture requires libzvbi.
Showing the changes to libavdevice/decklink_dec.cpp (1 of 6 files). Show all
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| @@ -25,14 +25,47 @@ · 24 unmodified lines | |||
| 25 | #include <semaphore.h> | 25 | #include <semaphore.h> |
| 26 | 26 | ||
| 27 | extern "C" { | 27 | extern "C" { |
| 28 | #include "config.h" | ||
| 28 | #include "libavformat/avformat.h" | 29 | #include "libavformat/avformat.h" |
| 29 | #include "libavformat/internal.h" | 30 | #include "libavformat/internal.h" |
| 30 | #include "libavutil/imgutils.h" | 31 | #include "libavutil/imgutils.h" |
| 32 | #if CONFIG_LIBZVBI | ||
| 33 | #include <libzvbi.h> | ||
| 34 | #endif | ||
| 31 | } | 35 | } |
| 32 | 36 | ||
| 33 | #include "decklink_common.h" | 37 | #include "decklink_common.h" |
| 34 | #include "decklink_dec.h" | 38 | #include "decklink_dec.h" |
| 35 | 39 | ||
| 40 | #if CONFIG_LIBZVBI | ||
| 41 | static uint8_t calc_parity_and_line_offset(int line) | ||
| 42 | { | ||
| 43 | uint8_t ret = (line < 313) << 5; | ||
| 44 | if (line >= 7 && line <= 22) | ||
| 45 | ret += line; | ||
| 46 | if (line >= 320 && line <= 335) | ||
| 47 | ret += (line - 313); | ||
| 48 | return ret; | ||
| 49 | } | ||
| 50 | |||
| 51 | int teletext_data_unit_from_vbi_data(int line, uint8_t *src, uint8_t *tgt) | ||
| 52 | { | ||
| 53 | vbi_bit_slicer slicer; | ||
| 54 | |||
| 55 | vbi_bit_slicer_init(&slicer, 720, 13500000, 6937500, 6937500, 0x00aaaae4, 0xffff, 18, 6, 42 * 8, VBI_MODULATION_NRZ_MSB, VBI_PIXFMT_UYVY); | ||
| 56 | |||
| 57 | if (vbi_bit_slice(&slicer, src, tgt + 4) == FALSE) | ||
| 58 | return -1; | ||
| 59 | |||
| 60 | tgt[0] = 0x02; // data_unit_id | ||
| 61 | tgt[1] = 0x2c; // data_unit_length | ||
| 62 | tgt[2] = calc_parity_and_line_offset(line); // field_parity, line_offset | ||
| 63 | tgt[3] = 0xe4; // framing code | ||
| 64 | |||
| 65 | return 0; | ||
| 66 | } | ||
| 67 | #endif | ||
| 68 | |||
| 36 | static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q) | 69 | static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q) |
| 37 | { | 70 | { |
| 38 | memset(q, 0, sizeof(AVPacketQueue)); | 71 | memset(q, 0, sizeof(AVPacketQueue)); |
| @@ -277,6 +310,50 @@ HRESULT decklink_input_callback::VideoInputFrameArrived( · 238 unmodified lines | |||
| 277 | pkt.size = videoFrame->GetRowBytes() * | 310 | pkt.size = videoFrame->GetRowBytes() * |
| 278 | videoFrame->GetHeight(); | 311 | videoFrame->GetHeight(); |
| 279 | //fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts); | 312 | //fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts); |
| 313 | |||
| 314 | #if CONFIG_LIBZVBI | ||
| 315 | if (!no_video && ctx->teletext_lines && videoFrame->GetPixelFormat() == bmdFormat8BitYUV && videoFrame->GetWidth() == 720) { | ||
| 316 | IDeckLinkVideoFrameAncillary *vanc; | ||
| 317 | AVPacket txt_pkt; | ||
| 318 | uint8_t txt_buf0[1611]; // max 35 * 46 bytes decoded teletext lines + 1 byte data_identifier | ||
| 319 | uint8_t *txt_buf = txt_buf0; | ||
| 320 | |||
| 321 | if (videoFrame->GetAncillaryData(&vanc) == S_OK) { | ||
| 322 | int i; | ||
| 323 | int64_t line_mask = 1; | ||
| 324 | txt_buf[0] = 0x10; // data_identifier - EBU_data | ||
| 325 | txt_buf++; | ||
| 326 | for (i = 6; i < 336; i++, line_mask <<= 1) { | ||
| 327 | uint8_t *buf; | ||
| 328 | if ((ctx->teletext_lines & line_mask) && vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) { | ||
| 329 | if (teletext_data_unit_from_vbi_data(i, buf, txt_buf) >= 0) | ||
| 330 | txt_buf += 46; | ||
| 331 | } | ||
| 332 | if (i == 22) | ||
| 333 | i = 317; | ||
| 334 | } | ||
| 335 | vanc->Release(); | ||
| 336 | if (txt_buf - txt_buf0 > 1) { | ||
| 337 | int stuffing_units = (4 - ((45 + txt_buf - txt_buf0) / 46) % 4) % 4; | ||
| 338 | while (stuffing_units--) { | ||
| 339 | memset(txt_buf, 0xff, 46); | ||
| 340 | txt_buf[1] = 0x2c; // data_unit_length | ||
| 341 | txt_buf += 46; | ||
| 342 | } | ||
| 343 | av_init_packet(&txt_pkt); | ||
| 344 | txt_pkt.pts = pkt.pts; | ||
| 345 | txt_pkt.dts = pkt.dts; | ||
| 346 | txt_pkt.stream_index = ctx->teletext_st->index; | ||
| 347 | txt_pkt.data = txt_buf0; | ||
| 348 | txt_pkt.size = txt_buf - txt_buf0; | ||
| 349 | if (avpacket_queue_put(&ctx->queue, &txt_pkt) < 0) { | ||
| 350 | ++ctx->dropped; | ||
| 351 | } | ||
| 352 | } | ||
| 353 | } | ||
| 354 | } | ||
| 355 | #endif | ||
| 356 | |||
| 280 | c->frame_number++; | 357 | c->frame_number++; |
| 281 | if (avpacket_queue_put(&ctx->queue, &pkt) < 0) { | 358 | if (avpacket_queue_put(&ctx->queue, &pkt) < 0) { |
| 282 | ++ctx->dropped; | 359 | ++ctx->dropped; |
| @@ -378,9 +455,17 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx) · 95 unmodified lines | |||
| 378 | return AVERROR(ENOMEM); | 455 | return AVERROR(ENOMEM); |
| 379 | ctx->list_devices = cctx->list_devices; | 456 | ctx->list_devices = cctx->list_devices; |
| 380 | ctx->list_formats = cctx->list_formats; | 457 | ctx->list_formats = cctx->list_formats; |
| 458 | ctx->teletext_lines = cctx->teletext_lines; | ||
| 381 | ctx->preroll = cctx->preroll; | 459 | ctx->preroll = cctx->preroll; |
| 382 | cctx->ctx = ctx; | 460 | cctx->ctx = ctx; |
| 383 | 461 | ||
| 462 | #if !CONFIG_LIBZVBI | ||
| 463 | if (ctx->teletext_lines) { | ||
| 464 | av_log(avctx, AV_LOG_ERROR, "Libzvbi support is needed for capturing teletext, please recompile FFmpeg.\n"); | ||
| 465 | return AVERROR(ENOSYS); | ||
| 466 | } | ||
| 467 | #endif | ||
| 468 | |||
| 384 | iter = CreateDeckLinkIteratorInstance(); | 469 | iter = CreateDeckLinkIteratorInstance(); |
| 385 | if (!iter) { | 470 | if (!iter) { |
| 386 | av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n"); | 471 | 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) · 101 unmodified lines | |||
| 488 | 573 | ||
| 489 | ctx->video_st=st; | 574 | ctx->video_st=st; |
| 490 | 575 | ||
| 576 | if (ctx->teletext_lines) { | ||
| 577 | st = avformat_new_stream(avctx, NULL); | ||
| 578 | if (!st) { | ||
| 579 | av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n"); | ||
| 580 | goto error; | ||
| 581 | } | ||
| 582 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | ||
| 583 | st->codec->time_base.den = ctx->bmd_tb_den; | ||
| 584 | st->codec->time_base.num = ctx->bmd_tb_num; | ||
| 585 | st->codec->codec_id = AV_CODEC_ID_DVB_TELETEXT; | ||
| 586 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ | ||
| 587 | ctx->teletext_st = st; | ||
| 588 | } | ||
| 589 | |||
| 491 | result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, 2); | 590 | result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, 2); |
| 492 | 591 | ||
| 493 | if (result != S_OK) { | 592 | if (result != S_OK) { |