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avdevice/decklink_dec: Extraction of luma from V210 VANC modularized

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In preparation to support multiple VANC data decode

Signed-off-by: Karthick J <kjeyapal@akamai.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Karthick J 2017-08-30 10:21:00 +05:30 committed by Marton Balint
parent e6cdf30fb4
commit a8755785d7
1 changed files with 21 additions and 14 deletions
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35
libavdevice/decklink_dec.cpp
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@ -46,6 +46,8 @@ extern "C" {
#include "decklink_common.h"
#include "decklink_dec.h"
#define MAX_WIDTH_VANC 1920
typedef struct VANCLineNumber {
BMDDisplayMode mode;
int vanc_start;
@ -103,6 +105,18 @@ static int get_vanc_line_idx(BMDDisplayMode mode)
return i - 1;
}
/* The 10-bit VANC data is packed in V210, we only need the luma component. */
static void extract_luma_from_v210(uint16_t *dst, const uint8_t *src, int width)
{
int i;
for (i = 0; i < width / 3; i += 3) {
*dst++ = (src[1] >> 2) + ((src[2] & 15) << 6);
*dst++ = src[4] + ((src[5] & 3) << 8);
*dst++ = (src[6] >> 4) + ((src[7] & 63) << 4);
src += 8;
}
}
static uint8_t calc_parity_and_line_offset(int line)
{
uint8_t ret = (line < 313) << 5;
@ -218,19 +232,10 @@ static uint8_t* teletext_data_unit_from_ancillary_packet(uint16_t *py, uint16_t
return tgt;
}
static uint8_t* teletext_data_unit_from_vanc_data(uint8_t *src, uint8_t *tgt, int64_t wanted_lines)
static uint8_t* teletext_data_unit_from_vanc_data(uint16_t *py, uint8_t *tgt, int64_t wanted_lines)
{
uint16_t y[1920];
uint16_t *py = y;
uint16_t *pend = y + 1920;
/* The 10-bit VANC data is packed in V210, we only need the luma component. */
while (py < pend) {
*py++ = (src[1] >> 2) + ((src[2] & 15) << 6);
*py++ = src[4] + ((src[5] & 3) << 8);
*py++ = (src[6] >> 4) + ((src[7] & 63) << 4);
src += 8;
}
py = y;
uint16_t *pend = py + 1920;
while (py < pend - 6) {
if (py[0] == 0 && py[1] == 0x3ff && py[2] == 0x3ff) { // ancillary data flag
py += 3;
@ -559,13 +564,15 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
}
}
#endif
if (vanc_format == bmdFormat10BitYUV) {
if (vanc_format == bmdFormat10BitYUV && videoFrame->GetWidth() <= MAX_WIDTH_VANC) {
int idx = get_vanc_line_idx(ctx->bmd_mode);
for (i = vanc_line_numbers[idx].vanc_start; i <= vanc_line_numbers[idx].vanc_end; i++) {
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 (videoFrame->GetWidth() == 1920) {
txt_buf = teletext_data_unit_from_vanc_data(buf, txt_buf, ctx->teletext_lines);
txt_buf = teletext_data_unit_from_vanc_data(luma_vanc, txt_buf, ctx->teletext_lines);
if (txt_buf - txt_buf0 > 1611) { // ensure we still have at least 1920 bytes free in the buffer
av_log(avctx, AV_LOG_ERROR, "Too many OP47 teletext packets.\n");
break;