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proresdec: simplify slice component offsets handling

This commit is contained in:
Kostya Shishkov 2013-05-18 07:06:19 +02:00
parent cfbd98abe8
commit 03ece7b040
1 changed files with 27 additions and 25 deletions
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52
libavcodec/proresdec.c
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@ -559,6 +559,7 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
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;
int coff[4];
buf = ctx->slice_data[slice_num].index;
slice_data_size = ctx->slice_data[slice_num + 1].index - buf;
@ -579,13 +580,19 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
y_data += y_linesize;
u_data += u_linesize;
v_data += v_linesize;
a_data += a_linesize;
if (a_data)
a_data += a_linesize;
}
y_linesize <<= 1;
u_linesize <<= 1;
v_linesize <<= 1;
a_linesize <<= 1;
}
y_data += (mb_y_pos << 4) * y_linesize + (mb_x_pos << 5);
u_data += (mb_y_pos << 4) * u_linesize + (mb_x_pos << ctx->mb_chroma_factor);
v_data += (mb_y_pos << 4) * v_linesize + (mb_x_pos << ctx->mb_chroma_factor);
if (a_data)
a_data += (mb_y_pos << 4) * a_linesize + (mb_x_pos << 5);
if (slice_data_size < 6) {
av_log(avctx, AV_LOG_ERROR, "slice data too small\n");
@ -594,15 +601,18 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
/* parse slice header */
hdr_size = buf[0] >> 3;
coff[0] = hdr_size;
y_data_size = AV_RB16(buf + 2);
coff[1] = coff[0] + y_data_size;
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;
coff[2] = coff[1] + u_data_size;
v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) : slice_data_size - coff[2];
coff[3] = coff[2] + v_data_size;
a_data_size = slice_data_size - coff[3];
if (hdr_size + y_data_size + u_data_size + v_data_size > slice_data_size ||
v_data_size < 0 || hdr_size < 6) {
/* if V or alpha component size is negative that means that previous
component sizes are too large */
if (v_data_size < 0 || a_data_size < 0 || hdr_size < 6) {
av_log(avctx, AV_LOG_ERROR, "invalid data size\n");
return AVERROR_INVALIDDATA;
}
@ -621,37 +631,29 @@ static int decode_slice(AVCodecContext *avctx, void *tdata)
}
/* decode luma plane */
decode_slice_plane(ctx, td, buf + hdr_size, y_data_size,
(uint16_t*) (y_data + (mb_y_pos << 4) * y_linesize +
(mb_x_pos << 5)), y_linesize,
decode_slice_plane(ctx, td, buf + coff[0], y_data_size,
(uint16_t*) y_data, y_linesize,
mbs_per_slice, 4, slice_width_factor + 2,
td->qmat_luma_scaled, 0);
/* decode U chroma plane */
decode_slice_plane(ctx, td, buf + hdr_size + y_data_size, u_data_size,
(uint16_t*) (u_data + (mb_y_pos << 4) * u_linesize +
(mb_x_pos << ctx->mb_chroma_factor)),
u_linesize, mbs_per_slice, ctx->num_chroma_blocks,
decode_slice_plane(ctx, td, buf + coff[1], u_data_size,
(uint16_t*) u_data, u_linesize,
mbs_per_slice, ctx->num_chroma_blocks,
slice_width_factor + ctx->chroma_factor - 1,
td->qmat_chroma_scaled, 1);
/* decode V chroma plane */
decode_slice_plane(ctx, td, buf + hdr_size + y_data_size + u_data_size,
v_data_size,
(uint16_t*) (v_data + (mb_y_pos << 4) * v_linesize +
(mb_x_pos << ctx->mb_chroma_factor)),
v_linesize, mbs_per_slice, ctx->num_chroma_blocks,
decode_slice_plane(ctx, td, buf + coff[2], v_data_size,
(uint16_t*) v_data, v_linesize,
mbs_per_slice, ctx->num_chroma_blocks,
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,
decode_alpha_plane(ctx, td, buf + coff[3], a_data_size,
(uint16_t*) a_data, a_linesize,
mbs_per_slice);
return 0;