Commit 0a2b25dc authored by Yaowu Xu's avatar Yaowu Xu

configure: add --enable-coefficient-range-checking

This commit adds a configure time option used to enable strict error
checking in decoder to make sure intermediate stage cofficients of
inverse transforms are within valid range of signed 16 bit integer.

For valid VP9 input streams, intermediate stage coefficients should
always stay within the range of a signed 16 bit integer. Coefficients
can go out of this range for invalid/corrupt VP9 streams. However,
strictly checking this range for every intermediate coefficient can
be a burden for decoder, therefore such validation is only enabled
with configure option --enable-coefficient-range-checking.

Change-Id: I47d47c8c4e48a922c3d223ca59064f51b3f0f5ed
parent 0fa4777b
......@@ -46,6 +46,9 @@ Advanced options:
${toggle_realtime_only} enable this option while building for real-time encoding
${toggle_onthefly_bitpacking} enable on-the-fly bitpacking in real-time encoding
${toggle_error_concealment} enable this option to get a decoder which is able to conceal losses
${toggle_coefficient_range_checking}
enable decoder to check if intermediate
transform coefficients are in valid range
${toggle_runtime_cpu_detect} runtime cpu detection
${toggle_shared} shared library support
${toggle_static} static library support
......@@ -327,6 +330,7 @@ CONFIG_LIST="
encode_perf_tests
multi_res_encoding
temporal_denoising
coefficient_range_checking
experimental
size_limit
${EXPERIMENT_LIST}
......@@ -384,6 +388,7 @@ CMDLINE_SELECT="
encode_perf_tests
multi_res_encoding
temporal_denoising
coefficient_range_checking
experimental
"
......
......@@ -81,6 +81,16 @@ static const int sinpi_4_9 = 15212;
static INLINE int dct_const_round_shift(int input) {
int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
#if CONFIG_COEFFICIENT_RANGE_CHECKING
// For valid VP9 input streams, intermediate stage coefficients should always
// stay within the range of a signed 16 bit integer. Coefficients can go out
// of this range for invalid/corrupt VP9 streams. However, strictly checking
// this range for every intermediate coefficient can burdensome for a decoder,
// therefore the following assertion is only enabled when configured with
// --enable-coefficient-range-checking.
assert(INT16_MIN <= rv);
assert(rv <= INT16_MAX);
#endif
return (int16_t)rv;
}
......
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