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g2meet: make JPEG tile decoder operate on 8x8 block mask 

This is needed for upcoming Go2Meeting (G2M2/G2M3) decoder.
This commit is contained in:
Kostya Shishkov 2014-02-08 13:39:32 +01:00
parent d6d7851801
commit 6477449243
1 changed files with 16 additions and 7 deletions
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23
libavcodec/g2meet.c
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@ -253,19 +253,25 @@ static int jpg_decode_data(JPGContext *c, int width, int height,
mb_h = (height + 15) >> 4;
if (!num_mbs)
num_mbs = mb_w * mb_h;
num_mbs = mb_w * mb_h * 4;
for (i = 0; i < 3; i++)
c->prev_dc[i] = 1024;
bx = by = 0;
c->dsp.clear_blocks(c->block[0]);
for (mb_y = 0; mb_y < mb_h; mb_y++) {
for (mb_x = 0; mb_x < mb_w; mb_x++) {
if (mask && !mask[mb_x]) {
if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
!mask[mb_x * 2 + mask_stride] &&
!mask[mb_x * 2 + 1 + mask_stride]) {
bx += 16;
continue;
}
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) {
if (mask && !mask[mb_x * 2 + i + j * mask_stride])
continue;
num_mbs--;
if ((ret = jpg_decode_block(c, &gb, 0,
c->block[i + j * 2])) != 0)
return ret;
@ -290,14 +296,14 @@ static int jpg_decode_data(JPGContext *c, int width, int height,
}
}
if (!--num_mbs)
if (!num_mbs)
return 0;
bx += 16;
}
bx = 0;
by += 16;
if (mask)
mask += mask_stride;
mask += mask_stride * 2;
}
return 0;
@ -403,7 +409,7 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
nblocks = *src++ + 1;
cblocks = 0;
bstride = FFALIGN(width, 16) >> 4;
bstride = FFALIGN(width, 16) >> 3;
// blocks are coded LSB and we need normal bitreader for JPEG data
bits = 0;
for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
@ -418,14 +424,17 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
cblocks += coded;
if (cblocks > nblocks)
return AVERROR_INVALIDDATA;
c->kempf_flags[j + i * bstride] = coded;
c->kempf_flags[j * 2 + i * 2 * bstride] =
c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
}
}
memset(c->jpeg_tile, 0, c->tile_stride * height);
jpg_decode_data(&c->jc, width, height, src, src_end - src,
c->jpeg_tile, c->tile_stride,
c->kempf_flags, bstride, nblocks, 0);
c->kempf_flags, bstride, nblocks * 4, 0);
kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
c->jpeg_tile, c->tile_stride,