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g2meet: make JPEG tile decoder operate on 8x8 block mask
This is needed for upcoming Go2Meeting (G2M2/G2M3) decoder.
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d6d7851801
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@ -253,19 +253,25 @@ static int jpg_decode_data(JPGContext *c, int width, int height,
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mb_h = (height + 15) >> 4;
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if (!num_mbs)
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num_mbs = mb_w * mb_h;
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num_mbs = mb_w * mb_h * 4;
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for (i = 0; i < 3; i++)
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c->prev_dc[i] = 1024;
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bx = by = 0;
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c->dsp.clear_blocks(c->block[0]);
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for (mb_y = 0; mb_y < mb_h; mb_y++) {
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for (mb_x = 0; mb_x < mb_w; mb_x++) {
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if (mask && !mask[mb_x]) {
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if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
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!mask[mb_x * 2 + mask_stride] &&
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!mask[mb_x * 2 + 1 + mask_stride]) {
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bx += 16;
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continue;
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}
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for (j = 0; j < 2; j++) {
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for (i = 0; i < 2; i++) {
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if (mask && !mask[mb_x * 2 + i + j * mask_stride])
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continue;
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num_mbs--;
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if ((ret = jpg_decode_block(c, &gb, 0,
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c->block[i + j * 2])) != 0)
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return ret;
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@ -290,14 +296,14 @@ static int jpg_decode_data(JPGContext *c, int width, int height,
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}
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}
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if (!--num_mbs)
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if (!num_mbs)
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return 0;
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bx += 16;
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}
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bx = 0;
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by += 16;
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if (mask)
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mask += mask_stride;
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mask += mask_stride * 2;
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}
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return 0;
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@ -403,7 +409,7 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
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nblocks = *src++ + 1;
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cblocks = 0;
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bstride = FFALIGN(width, 16) >> 4;
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bstride = FFALIGN(width, 16) >> 3;
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// blocks are coded LSB and we need normal bitreader for JPEG data
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bits = 0;
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for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
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@ -418,14 +424,17 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
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cblocks += coded;
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if (cblocks > nblocks)
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return AVERROR_INVALIDDATA;
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c->kempf_flags[j + i * bstride] = coded;
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c->kempf_flags[j * 2 + i * 2 * bstride] =
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c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
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c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
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c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
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}
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}
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memset(c->jpeg_tile, 0, c->tile_stride * height);
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jpg_decode_data(&c->jc, width, height, src, src_end - src,
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c->jpeg_tile, c->tile_stride,
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c->kempf_flags, bstride, nblocks, 0);
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c->kempf_flags, bstride, nblocks * 4, 0);
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kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
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c->jpeg_tile, c->tile_stride,
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