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Code Issues Releases Activity

prores: decode alpha plane when it's present

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This commit is contained in:
Kostya Shishkov 2013-05-17 19:40:35 +02:00
parent 7e2b15c094
commit cebdedca57
1 changed files with 103 additions and 9 deletions
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112
libavcodec/proresdec.c
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@ -134,12 +134,21 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
ctx->chroma_factor = (buf[12] >> 6) & 3;
ctx->mb_chroma_factor = ctx->chroma_factor + 2;
ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1;
ctx->alpha_info = buf[17] & 0xf;
if (ctx->alpha_info > 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);
return AVERROR_INVALIDDATA;
}
switch (ctx->chroma_factor) {
case 2:
avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA422P10
: AV_PIX_FMT_YUV422P10;
break;
case 3:
avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA444P10
: AV_PIX_FMT_YUV444P10;
break;
default:
av_log(avctx, AV_LOG_ERROR,
@ -168,10 +177,6 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
avctx->color_trc = buf[15];
avctx->colorspace = buf[16];
ctx->alpha_info = buf[17] & 0xf;
if (ctx->alpha_info)
avpriv_report_missing_feature(avctx, "Alpha channel");
ctx->qmat_changed = 0;
ptr = buf + 20;
flags = buf[19];
@ -466,6 +471,78 @@ static void decode_slice_plane(ProresContext *ctx, ProresThreadData *td,
}
static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
const int num_bits)
{
const int mask = (1 << num_bits) - 1;
int i, idx, val, alpha_val;
idx = 0;
alpha_val = mask;
do {
do {
if (get_bits1(gb))
val = get_bits(gb, num_bits);
else {
int sign;
val = get_bits(gb, num_bits == 16 ? 7 : 4);
sign = val & 1;
val = (val + 2) >> 1;
if (sign)
val = -val;
}
alpha_val = (alpha_val + val) & mask;
if (num_bits == 16)
dst[idx++] = alpha_val >> 6;
else
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
if (idx == num_coeffs - 1)
break;
} while (get_bits1(gb));
val = get_bits(gb, 4);
if (!val)
val = get_bits(gb, 11);
if (idx + val > num_coeffs)
val = num_coeffs - idx;
if (num_bits == 16)
for (i = 0; i < val; i++)
dst[idx++] = alpha_val >> 6;
else
for (i = 0; i < val; i++)
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
} while (idx < num_coeffs);
}
/**
* Decode alpha slice plane.
*/
static void decode_alpha_plane(ProresContext *ctx, ProresThreadData *td,
const uint8_t *buf, int data_size,
uint16_t *out_ptr, int linesize,
int mbs_per_slice)
{
GetBitContext gb;
int i;
uint16_t *block_ptr;
memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks));
init_get_bits(&gb, buf, data_size << 3);
if (ctx->alpha_info == 2)
unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 16);
else
unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 8);
block_ptr = td->blocks;
for (i = 0; i < 16; i++) {
memcpy(out_ptr, block_ptr, 16 * mbs_per_slice * sizeof(*out_ptr));
out_ptr += linesize >> 1;
block_ptr += 16 * mbs_per_slice;
}
}
static int decode_slice(AVCodecContext *avctx, void *tdata)
{
ProresThreadData *td = tdata;
@ -476,11 +553,12 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
int slice_num = td->slice_num;
int mbs_per_slice = td->slice_width;
const uint8_t *buf;
uint8_t *y_data, *u_data, *v_data;
uint8_t *y_data, *u_data, *v_data, *a_data;
AVFrame *pic = ctx->frame;
int i, sf, slice_width_factor;
int slice_data_size, hdr_size, y_data_size, u_data_size, v_data_size;
int y_linesize, u_linesize, v_linesize;
int slice_data_size, hdr_size;
int y_data_size, u_data_size, v_data_size, a_data_size;
int y_linesize, u_linesize, v_linesize, a_linesize;
buf = ctx->slice_data[slice_num].index;
slice_data_size = ctx->slice_data[slice_num + 1].index - buf;
@ -490,19 +568,23 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
y_data = pic->data[0];
u_data = pic->data[1];
v_data = pic->data[2];
a_data = pic->data[3];
y_linesize = pic->linesize[0];
u_linesize = pic->linesize[1];
v_linesize = pic->linesize[2];
a_linesize = pic->linesize[3];
if (pic->interlaced_frame) {
if (!(pic_num ^ pic->top_field_first)) {
y_data += y_linesize;
u_data += u_linesize;
v_data += v_linesize;
a_data += a_linesize;
}
y_linesize <<= 1;
u_linesize <<= 1;
v_linesize <<= 1;
a_linesize <<= 1;
}
if (slice_data_size < 6) {
@ -516,6 +598,8 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
u_data_size = AV_RB16(buf + 4);
v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) :
slice_data_size - y_data_size - u_data_size - hdr_size;
a_data_size = slice_data_size - y_data_size - u_data_size -
v_data_size - hdr_size;
if (hdr_size + y_data_size + u_data_size + v_data_size > slice_data_size ||
v_data_size < 0 || hdr_size < 6) {
@ -560,6 +644,16 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
slice_width_factor + ctx->chroma_factor - 1,
td->qmat_chroma_scaled, 1);
/* decode alpha plane if available */
if (a_data && a_data_size)
decode_alpha_plane(ctx, td,
buf + hdr_size + y_data_size +
u_data_size + v_data_size,
a_data_size,
(uint16_t*) (a_data + (mb_y_pos << 4) * a_linesize +
(mb_x_pos << 5)), a_linesize,
mbs_per_slice);
return 0;
}