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Fix several bugs in h264bitstream

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This commit is contained in:
Cameron Gutman
2026-07-26 18:55:23 -05:00
parent acea86de24
commit 3e24a7a1a5
3 changed files with 51 additions and 15 deletions
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h264bitstream/h264_stream.c
+32 -4
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@@ -109,6 +109,10 @@ void read_seq_parameter_set_rbsp(sps_t* sps, bs_t* b)
sps->offset_for_non_ref_pic = bs_read_se(b);
sps->offset_for_top_to_bottom_field = bs_read_se(b);
sps->num_ref_frames_in_pic_order_cnt_cycle = bs_read_ue(b);
if (sps->num_ref_frames_in_pic_order_cnt_cycle > 256)
{
sps->num_ref_frames_in_pic_order_cnt_cycle = 256;
}
for( i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++ )
{
sps->offset_for_ref_frame[ i ] = bs_read_se(b);
@@ -231,6 +235,10 @@ void read_vui_parameters(sps_t* sps, bs_t* b)
void read_hrd_parameters(hrd_t* hrd, bs_t* b)
{
hrd->cpb_cnt_minus1 = bs_read_ue(b);
if (hrd->cpb_cnt_minus1 > 31)
{
hrd->cpb_cnt_minus1 = 31;
}
hrd->bit_rate_scale = bs_read_u(b, 4);
hrd->cpb_size_scale = bs_read_u(b, 4);
for( int SchedSelIdx = 0; SchedSelIdx <= hrd->cpb_cnt_minus1; SchedSelIdx++ )
@@ -326,7 +334,7 @@ void write_seq_parameter_set_rbsp(sps_t* sps, bs_t* b)
bs_write_u1(b, sps->seq_scaling_matrix_present_flag);
if( sps->seq_scaling_matrix_present_flag )
{
for( i = 0; i < 8; i++ )
for( i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++ )
{
bs_write_u1(b, sps->seq_scaling_list_present_flag[ i ]);
if( sps->seq_scaling_list_present_flag[ i ] )
@@ -396,9 +404,29 @@ void write_scaling_list(bs_t* b, int* scalingList, int sizeOfScalingList, int* u
{
if( nextScale != 0 )
{
nextScale = scalingList[ j ];
if (useDefaultScalingMatrixFlag[0]) { nextScale = 0; }
delta_scale = (nextScale - lastScale) % 256 ;
if (useDefaultScalingMatrixFlag[0]) {
nextScale = 0;
} else {
nextScale = scalingList[ j ];
if (j > 0 && nextScale == lastScale) {
int all_same = 1;
for (int k = j + 1; k < sizeOfScalingList; k++) {
if (scalingList[k] != lastScale) {
all_same = 0;
break;
}
}
if (all_same) {
nextScale = 0;
}
}
}
delta_scale = nextScale - lastScale;
if (delta_scale < -128) {
delta_scale += 256;
} else if (delta_scale > 127) {
delta_scale -= 256;
}
bs_write_se(b, delta_scale);
}
lastScale = scalingList[ j ];