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Code Issues Releases Activity

avcodec/proresdec : add unpack alpha 12 func

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This commit is contained in:
Martin Vignali 2018-11-17 23:37:23 +01:00
parent 859604fe9d
commit fddc92d454
1 changed files with 41 additions and 6 deletions
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47
libavcodec/proresdec2.c
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@ -46,6 +46,11 @@ static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[
dst[i] = permutation[src[i]];
}
#define ALPHA_SHIFT_16_TO_10(alpha_val) (alpha_val >> 6)
#define ALPHA_SHIFT_8_TO_10(alpha_val) ((alpha_val << 2) | (alpha_val >> 6))
#define ALPHA_SHIFT_16_TO_12(alpha_val) (alpha_val >> 4)
#define ALPHA_SHIFT_8_TO_12(alpha_val) ((alpha_val << 4) | (alpha_val >> 4))
static void inline unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
const int num_bits, const int decode_precision) {
const int mask = (1 << num_bits) - 1;
@ -67,9 +72,17 @@ static void inline unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs
}
alpha_val = (alpha_val + val) & mask;
if (num_bits == 16) {
dst[idx++] = alpha_val >> 6;
if (decode_precision == 10) {
dst[idx++] = ALPHA_SHIFT_16_TO_10(alpha_val);
} else { /* 12b */
dst[idx++] = ALPHA_SHIFT_16_TO_12(alpha_val);
}
} else {
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
if (decode_precision == 10) {
dst[idx++] = ALPHA_SHIFT_8_TO_10(alpha_val);
} else { /* 12b */
dst[idx++] = ALPHA_SHIFT_8_TO_12(alpha_val);
}
}
if (idx >= num_coeffs)
break;
@ -80,11 +93,21 @@ static void inline unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs
if (idx + val > num_coeffs)
val = num_coeffs - idx;
if (num_bits == 16) {
for (i = 0; i < val; i++)
dst[idx++] = alpha_val >> 6;
for (i = 0; i < val; i++) {
if (decode_precision == 10) {
dst[idx++] = ALPHA_SHIFT_16_TO_10(alpha_val);
} else { /* 12b */
dst[idx++] = ALPHA_SHIFT_16_TO_12(alpha_val);
}
}
} else {
for (i = 0; i < val; i++)
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
for (i = 0; i < val; i++) {
if (decode_precision == 10) {
dst[idx++] = ALPHA_SHIFT_8_TO_10(alpha_val);
} else { /* 12b */
dst[idx++] = ALPHA_SHIFT_8_TO_12(alpha_val);
}
}
}
} while (idx < num_coeffs);
}
@ -99,6 +122,16 @@ static void unpack_alpha_10(GetBitContext *gb, uint16_t *dst, int num_coeffs,
}
}
static void unpack_alpha_12(GetBitContext *gb, uint16_t *dst, int num_coeffs,
const int num_bits)
{
if (num_bits == 16) {
unpack_alpha(gb, dst, num_coeffs, 16, 12);
} else { /* 8 bits alpha */
unpack_alpha(gb, dst, num_coeffs, 8, 12);
}
}
static av_cold int decode_init(AVCodecContext *avctx)
{
int ret = 0;
@ -146,6 +179,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (avctx->bits_per_raw_sample == 10){
ctx->unpack_alpha = unpack_alpha_10;
} else if (avctx->bits_per_raw_sample == 12){
ctx->unpack_alpha = unpack_alpha_12;
} else {
av_log(avctx, AV_LOG_ERROR, "Fail to set unpack_alpha for bits per raw sample %d\n", avctx->bits_per_raw_sample);
return AVERROR_BUG;