On Mon, 5 Feb 2018, Ray Tiley wrote:
On Sun, Jan 28, 2018 at 9:40 PM Ray Tiley <rayti...@gmail.com> wrote:This changes how NTSC VANC is extracted from the buffer. In NTSC the vanc data interleved between the uyvy and not just the luma as in high definition resolutions. In my testing this allows a decklink card encoding valid NTSC closed captions to pass the caption data to the x264 encoder. Updated with rewviews from Devon Heitmueller and Marton Balint. Signed-off-by: Ray Tiley <rayti...@gmail.com> --- libavdevice/decklink_dec.cpp | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp index 94dae26..c7811eb 100644 --- a/libavdevice/decklink_dec.cpp +++ b/libavdevice/decklink_dec.cpp @@ -149,6 +149,30 @@ static void extract_luma_from_v210(uint16_t *dst, const uint8_t *src, int width) } } +static void unpack_v210(uint16_t *dst, const uint8_t *src, int width) +{ + int i; + for (i = 0; i < width / 6; i++) { + *dst++ = src[0] + ((src[1] & 3) << 8); + *dst++ = (src[1] >> 2) + ((src[2] & 15) << 6); + *dst++ = (src[2] >> 4) + ((src[3] & 63) << 4); + + *dst++ = src[4] + ((src[5] & 3) << 8); + *dst++ = (src[5] >> 2) + ((src[6] & 15) << 6); + *dst++ = (src[6] >> 4) + ((src[7] & 63) << 4); + + *dst++ = src[8] + ((src[9] & 3) << 8); + *dst++ = (src[9] >> 2) + ((src[10] & 15) << 6); + *dst++ = (src[10] >> 4) + ((src[11] & 63) << 4); + + *dst++ = src[12] + ((src[13] & 3) << 8); + *dst++ = (src[13] >> 2) + ((src[14] & 15) << 6); + *dst++ = (src[14] >> 4) + ((src[15] & 63) << 4); + + src += 16; + } +} + static uint8_t calc_parity_and_line_offset(int line) { uint8_t ret = (line < 313) << 5; @@ -741,7 +765,11 @@ HRESULT decklink_input_callback::VideoInputFrameArrived( uint8_t *buf; if (vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) { uint16_t luma_vanc[MAX_WIDTH_VANC]; - extract_luma_from_v210(luma_vanc, buf, videoFrame->GetWidth()); + if (ctx->bmd_mode == bmdModeNTSC) { + unpack_v210(luma_vanc, buf, videoFrame->GetWidth()); + } else { + extract_luma_from_v210(luma_vanc, buf, videoFrame->GetWidth()); + } txt_buf = get_metadata(avctx, luma_vanc, videoFrame->GetWidth(), txt_buf, sizeof(txt_buf0) - (txt_buf - txt_buf0), &pkt); } -- 2.7.4Anything else I need to do for this patch?
I thought you are working on an updated patch, or I just missed the new one? The email you replied to here definitely contains the old, without interleaved VANC autodetection or proper width for get_metadata.
Regards, Marton _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
