diff options
| -rw-r--r-- | libavcodec/cbs_h2645.c | 10 | ||||
| -rw-r--r-- | libavcodec/cbs_h265_syntax_template.c | 9 |
2 files changed, 13 insertions, 6 deletions
diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c index d42073cc5a..095e449ddc 100644 --- a/libavcodec/cbs_h2645.c +++ b/libavcodec/cbs_h2645.c @@ -233,6 +233,16 @@ static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc, return 0; } +// payload_extension_present() - true if we are before the last 1-bit +// in the payload structure, which must be in the last byte. +static int cbs_h265_payload_extension_present(GetBitContext *gbc, uint32_t payload_size, + int cur_pos) +{ + int bits_left = payload_size * 8 - cur_pos; + return (bits_left > 0 && + (bits_left > 7 || show_bits(gbc, bits_left) & MAX_UINT_BITS(bits_left - 1))); +} + #define HEADER(name) do { \ ff_cbs_trace_header(ctx, name); \ } while (0) diff --git a/libavcodec/cbs_h265_syntax_template.c b/libavcodec/cbs_h265_syntax_template.c index a51b12cfc6..ed08b06e9c 100644 --- a/libavcodec/cbs_h265_syntax_template.c +++ b/libavcodec/cbs_h265_syntax_template.c @@ -1572,7 +1572,7 @@ static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw, int err, i, length; #ifdef READ - int start_pos, end_pos, bits_left; + int start_pos, end_pos; start_pos = get_bits_count(rw); #endif @@ -1651,12 +1651,9 @@ static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw, } #ifdef READ - // payload_extension_present() - true if we are before the last 1-bit - // in the payload structure, which must be in the last byte. end_pos = get_bits_count(rw); - bits_left = *payload_size * 8 - (end_pos - start_pos); - if (bits_left > 0 && - (bits_left > 7 || ff_ctz(show_bits(rw, bits_left)) < bits_left - 1)) + if (cbs_h265_payload_extension_present(rw, *payload_size, + end_pos - start_pos)) flag(use_alt_cpb_params_flag); else infer(use_alt_cpb_params_flag, 0); |