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FFmpeg/libavcodec/cbs_h264_syntax_template.c
Andreas Rheinhardt ab2173c0a5 avcodec/cbs_h2645: Avoid function pointer casts, fix UB 
The SEI message read/write functions are called
via function pointers where the SEI message-specific
context is passed as void*. But the actual function
definitions use a pointer to their proper context
in place of void*, making the calls undefined behaviour.
Clang UBSan 17 warns about this.

This commit fixes this by adding wrapper functions
(created via macros) that have the right type that
call the actual functions. This reduced the number of failing
FATE tests with UBSan from 164 to 85 here.

Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-02-25 13:42:47 +01:00

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
static int FUNC(rbsp_trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)
{
int err;
fixed(1, rbsp_stop_one_bit, 1);
while (byte_alignment(rw) != 0)
fixed(1, rbsp_alignment_zero_bit, 0);
return 0;
}
static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawNALUnitHeader *current,
uint32_t valid_type_mask)
{
int err;
fixed(1, forbidden_zero_bit, 0);
ub(2, nal_ref_idc);
ub(5, nal_unit_type);
if (!(1 << current->nal_unit_type & valid_type_mask)) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid NAL unit type %d.\n",
current->nal_unit_type);
return AVERROR_INVALIDDATA;
}
if (current->nal_unit_type == 14 ||
current->nal_unit_type == 20 ||
current->nal_unit_type == 21) {
if (current->nal_unit_type != 21)
flag(svc_extension_flag);
else
flag(avc_3d_extension_flag);
if (current->svc_extension_flag) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "SVC not supported.\n");
return AVERROR_PATCHWELCOME;
} else if (current->avc_3d_extension_flag) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "3DAVC not supported.\n");
return AVERROR_PATCHWELCOME;
} else {
av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC not supported.\n");
return AVERROR_PATCHWELCOME;
}
}
return 0;
}
static int FUNC(scaling_list)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawScalingList *current,
int size_of_scaling_list)
{
int err, i, scale;
scale = 8;
for (i = 0; i < size_of_scaling_list; i++) {
ses(delta_scale[i], -128, +127, 1, i);
scale = (scale + current->delta_scale[i] + 256) % 256;
if (scale == 0)
break;
}
return 0;
}
static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawHRD *current)
{
int err, i;
ue(cpb_cnt_minus1, 0, 31);
ub(4, bit_rate_scale);
ub(4, cpb_size_scale);
for (i = 0; i <= current->cpb_cnt_minus1; i++) {
ues(bit_rate_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
ues(cpb_size_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
flags(cbr_flag[i], 1, i);
}
ub(5, initial_cpb_removal_delay_length_minus1);
ub(5, cpb_removal_delay_length_minus1);
ub(5, dpb_output_delay_length_minus1);
ub(5, time_offset_length);
return 0;
}
static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawVUI *current, H264RawSPS *sps)
{
int err;
flag(aspect_ratio_info_present_flag);
if (current->aspect_ratio_info_present_flag) {
ub(8, aspect_ratio_idc);
if (current->aspect_ratio_idc == 255) {
ub(16, sar_width);
ub(16, sar_height);
}
} else {
infer(aspect_ratio_idc, 0);
}
flag(overscan_info_present_flag);
if (current->overscan_info_present_flag)
flag(overscan_appropriate_flag);
flag(video_signal_type_present_flag);
if (current->video_signal_type_present_flag) {
ub(3, video_format);
flag(video_full_range_flag);
flag(colour_description_present_flag);
if (current->colour_description_present_flag) {
ub(8, colour_primaries);
ub(8, transfer_characteristics);
ub(8, matrix_coefficients);
} else {
infer(colour_primaries, 2);
infer(transfer_characteristics, 2);
infer(matrix_coefficients, 2);
}
} else {
infer(video_format, 5);
infer(video_full_range_flag, 0);
infer(colour_primaries, 2);
infer(transfer_characteristics, 2);
infer(matrix_coefficients, 2);
}
flag(chroma_loc_info_present_flag);
if (current->chroma_loc_info_present_flag) {
ue(chroma_sample_loc_type_top_field, 0, 5);
ue(chroma_sample_loc_type_bottom_field, 0, 5);
} else {
infer(chroma_sample_loc_type_top_field, 0);
infer(chroma_sample_loc_type_bottom_field, 0);
}
flag(timing_info_present_flag);
if (current->timing_info_present_flag) {
u(32, num_units_in_tick, 1, UINT32_MAX);
u(32, time_scale, 1, UINT32_MAX);
flag(fixed_frame_rate_flag);
} else {
infer(fixed_frame_rate_flag, 0);
}
flag(nal_hrd_parameters_present_flag);
if (current->nal_hrd_parameters_present_flag)
CHECK(FUNC(hrd_parameters)(ctx, rw, &current->nal_hrd_parameters));
flag(vcl_hrd_parameters_present_flag);
if (current->vcl_hrd_parameters_present_flag)
CHECK(FUNC(hrd_parameters)(ctx, rw, &current->vcl_hrd_parameters));
if (current->nal_hrd_parameters_present_flag ||
current->vcl_hrd_parameters_present_flag)
flag(low_delay_hrd_flag);
else
infer(low_delay_hrd_flag, 1 - current->fixed_frame_rate_flag);
flag(pic_struct_present_flag);
flag(bitstream_restriction_flag);
if (current->bitstream_restriction_flag) {
flag(motion_vectors_over_pic_boundaries_flag);
ue(max_bytes_per_pic_denom, 0, 16);
ue(max_bits_per_mb_denom, 0, 16);
// The current version of the standard constrains this to be in
// [0,15], but older versions allow 16.
ue(log2_max_mv_length_horizontal, 0, 16);
ue(log2_max_mv_length_vertical, 0, 16);
ue(max_num_reorder_frames, 0, H264_MAX_DPB_FRAMES);
ue(max_dec_frame_buffering, 0, H264_MAX_DPB_FRAMES);
} else {
infer(motion_vectors_over_pic_boundaries_flag, 1);
infer(max_bytes_per_pic_denom, 2);
infer(max_bits_per_mb_denom, 1);
infer(log2_max_mv_length_horizontal, 15);
infer(log2_max_mv_length_vertical, 15);
if ((sps->profile_idc == 44 || sps->profile_idc == 86 ||
sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 244) &&
sps->constraint_set3_flag) {
infer(max_num_reorder_frames, 0);
infer(max_dec_frame_buffering, 0);
} else {
infer(max_num_reorder_frames, H264_MAX_DPB_FRAMES);
infer(max_dec_frame_buffering, H264_MAX_DPB_FRAMES);
}
}
return 0;
}
static int FUNC(vui_parameters_default)(CodedBitstreamContext *ctx,
RWContext *rw, H264RawVUI *current,
H264RawSPS *sps)
{
infer(aspect_ratio_idc, 0);
infer(video_format, 5);
infer(video_full_range_flag, 0);
infer(colour_primaries, 2);
infer(transfer_characteristics, 2);
infer(matrix_coefficients, 2);
infer(chroma_sample_loc_type_top_field, 0);
infer(chroma_sample_loc_type_bottom_field, 0);
infer(fixed_frame_rate_flag, 0);
infer(low_delay_hrd_flag, 1);
infer(pic_struct_present_flag, 0);
infer(motion_vectors_over_pic_boundaries_flag, 1);
infer(max_bytes_per_pic_denom, 2);
infer(max_bits_per_mb_denom, 1);
infer(log2_max_mv_length_horizontal, 15);
infer(log2_max_mv_length_vertical, 15);
if ((sps->profile_idc == 44 || sps->profile_idc == 86 ||
sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 244) &&
sps->constraint_set3_flag) {
infer(max_num_reorder_frames, 0);
infer(max_dec_frame_buffering, 0);
} else {
infer(max_num_reorder_frames, H264_MAX_DPB_FRAMES);
infer(max_dec_frame_buffering, H264_MAX_DPB_FRAMES);
}
return 0;
}
static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSPS *current)
{
int err, i;
HEADER("Sequence Parameter Set");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_SPS));
ub(8, profile_idc);
flag(constraint_set0_flag);
flag(constraint_set1_flag);
flag(constraint_set2_flag);
flag(constraint_set3_flag);
flag(constraint_set4_flag);
flag(constraint_set5_flag);
u(2, reserved_zero_2bits, 0, 0);
ub(8, level_idc);
ue(seq_parameter_set_id, 0, 31);
if (current->profile_idc == 100 || current->profile_idc == 110 ||
current->profile_idc == 122 || current->profile_idc == 244 ||
current->profile_idc == 44 || current->profile_idc == 83 ||
current->profile_idc == 86 || current->profile_idc == 118 ||
current->profile_idc == 128 || current->profile_idc == 138) {
ue(chroma_format_idc, 0, 3);
if (current->chroma_format_idc == 3)
flag(separate_colour_plane_flag);
else
infer(separate_colour_plane_flag, 0);
ue(bit_depth_luma_minus8, 0, 6);
ue(bit_depth_chroma_minus8, 0, 6);
flag(qpprime_y_zero_transform_bypass_flag);
flag(seq_scaling_matrix_present_flag);
if (current->seq_scaling_matrix_present_flag) {
for (i = 0; i < ((current->chroma_format_idc != 3) ? 8 : 12); i++) {
flags(seq_scaling_list_present_flag[i], 1, i);
if (current->seq_scaling_list_present_flag[i]) {
if (i < 6)
CHECK(FUNC(scaling_list)(ctx, rw,
&current->scaling_list_4x4[i],
16));
else
CHECK(FUNC(scaling_list)(ctx, rw,
&current->scaling_list_8x8[i - 6],
64));
}
}
}
} else {
infer(chroma_format_idc, current->profile_idc == 183 ? 0 : 1);
infer(separate_colour_plane_flag, 0);
infer(bit_depth_luma_minus8, 0);
infer(bit_depth_chroma_minus8, 0);
}
ue(log2_max_frame_num_minus4, 0, 12);
ue(pic_order_cnt_type, 0, 2);
if (current->pic_order_cnt_type == 0) {
ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
} else if (current->pic_order_cnt_type == 1) {
flag(delta_pic_order_always_zero_flag);
se(offset_for_non_ref_pic, INT32_MIN + 1, INT32_MAX);
se(offset_for_top_to_bottom_field, INT32_MIN + 1, INT32_MAX);
ue(num_ref_frames_in_pic_order_cnt_cycle, 0, 255);
for (i = 0; i < current->num_ref_frames_in_pic_order_cnt_cycle; i++)
ses(offset_for_ref_frame[i], INT32_MIN + 1, INT32_MAX, 1, i);
}
ue(max_num_ref_frames, 0, H264_MAX_DPB_FRAMES);
flag(gaps_in_frame_num_allowed_flag);
ue(pic_width_in_mbs_minus1, 0, H264_MAX_MB_WIDTH);
ue(pic_height_in_map_units_minus1, 0, H264_MAX_MB_HEIGHT);
flag(frame_mbs_only_flag);
if (!current->frame_mbs_only_flag)
flag(mb_adaptive_frame_field_flag);
flag(direct_8x8_inference_flag);
flag(frame_cropping_flag);
if (current->frame_cropping_flag) {
ue(frame_crop_left_offset, 0, H264_MAX_WIDTH);
ue(frame_crop_right_offset, 0, H264_MAX_WIDTH);
ue(frame_crop_top_offset, 0, H264_MAX_HEIGHT);
ue(frame_crop_bottom_offset, 0, H264_MAX_HEIGHT);
}
flag(vui_parameters_present_flag);
if (current->vui_parameters_present_flag)
CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
else
CHECK(FUNC(vui_parameters_default)(ctx, rw, &current->vui, current));
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
static int FUNC(sps_extension)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSPSExtension *current)
{
int err;
HEADER("Sequence Parameter Set Extension");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_SPS_EXT));
ue(seq_parameter_set_id, 0, 31);
ue(aux_format_idc, 0, 3);
if (current->aux_format_idc != 0) {
int bits;
ue(bit_depth_aux_minus8, 0, 4);
flag(alpha_incr_flag);
bits = current->bit_depth_aux_minus8 + 9;
ub(bits, alpha_opaque_value);
ub(bits, alpha_transparent_value);
}
flag(additional_extension_flag);
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawPPS *current)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
int err, i;
HEADER("Picture Parameter Set");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_PPS));
ue(pic_parameter_set_id, 0, 255);
ue(seq_parameter_set_id, 0, 31);
sps = h264->sps[current->seq_parameter_set_id];
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
current->seq_parameter_set_id);
return AVERROR_INVALIDDATA;
}
flag(entropy_coding_mode_flag);
flag(bottom_field_pic_order_in_frame_present_flag);
ue(num_slice_groups_minus1, 0, 7);
if (current->num_slice_groups_minus1 > 0) {
unsigned int pic_size;
int iGroup;
pic_size = (sps->pic_width_in_mbs_minus1 + 1) *
(sps->pic_height_in_map_units_minus1 + 1);
ue(slice_group_map_type, 0, 6);
if (current->slice_group_map_type == 0) {
for (iGroup = 0; iGroup <= current->num_slice_groups_minus1; iGroup++)
ues(run_length_minus1[iGroup], 0, pic_size - 1, 1, iGroup);
} else if (current->slice_group_map_type == 2) {
for (iGroup = 0; iGroup < current->num_slice_groups_minus1; iGroup++) {
ues(top_left[iGroup], 0, pic_size - 1, 1, iGroup);
ues(bottom_right[iGroup],
current->top_left[iGroup], pic_size - 1, 1, iGroup);
}
} else if (current->slice_group_map_type == 3 ||
current->slice_group_map_type == 4 ||
current->slice_group_map_type == 5) {
flag(slice_group_change_direction_flag);
ue(slice_group_change_rate_minus1, 0, pic_size - 1);
} else if (current->slice_group_map_type == 6) {
ue(pic_size_in_map_units_minus1, pic_size - 1, pic_size - 1);
allocate(current->slice_group_id,
current->pic_size_in_map_units_minus1 + 1);
for (i = 0; i <= current->pic_size_in_map_units_minus1; i++)
us(av_log2(2 * current->num_slice_groups_minus1 + 1),
slice_group_id[i], 0, current->num_slice_groups_minus1, 1, i);
}
}
ue(num_ref_idx_l0_default_active_minus1, 0, 31);
ue(num_ref_idx_l1_default_active_minus1, 0, 31);
flag(weighted_pred_flag);
u(2, weighted_bipred_idc, 0, 2);
se(pic_init_qp_minus26, -26 - 6 * sps->bit_depth_luma_minus8, +25);
se(pic_init_qs_minus26, -26, +25);
se(chroma_qp_index_offset, -12, +12);
flag(deblocking_filter_control_present_flag);
flag(constrained_intra_pred_flag);
flag(redundant_pic_cnt_present_flag);
if (more_rbsp_data(current->more_rbsp_data))
{
flag(transform_8x8_mode_flag);
flag(pic_scaling_matrix_present_flag);
if (current->pic_scaling_matrix_present_flag) {
for (i = 0; i < 6 + (((sps->chroma_format_idc != 3) ? 2 : 6) *
current->transform_8x8_mode_flag); i++) {
flags(pic_scaling_list_present_flag[i], 1, i);
if (current->pic_scaling_list_present_flag[i]) {
if (i < 6)
CHECK(FUNC(scaling_list)(ctx, rw,
&current->scaling_list_4x4[i],
16));
else
CHECK(FUNC(scaling_list)(ctx, rw,
&current->scaling_list_8x8[i - 6],
64));
}
}
}
se(second_chroma_qp_index_offset, -12, +12);
} else {
infer(transform_8x8_mode_flag, 0);
infer(pic_scaling_matrix_present_flag, 0);
infer(second_chroma_qp_index_offset, current->chroma_qp_index_offset);
}
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
SEI_FUNC(sei_buffering_period, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIBufferingPeriod *current,
SEIMessageState *sei))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
int err, i, length;
HEADER("Buffering Period");
ue(seq_parameter_set_id, 0, 31);
sps = h264->sps[current->seq_parameter_set_id];
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
current->seq_parameter_set_id);
return AVERROR_INVALIDDATA;
}
h264->active_sps = sps;
if (sps->vui.nal_hrd_parameters_present_flag) {
for (i = 0; i <= sps->vui.nal_hrd_parameters.cpb_cnt_minus1; i++) {
length = sps->vui.nal_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;
xu(length, initial_cpb_removal_delay[SchedSelIdx],
current->nal.initial_cpb_removal_delay[i],
1, MAX_UINT_BITS(length), 1, i);
xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],
current->nal.initial_cpb_removal_delay_offset[i],
0, MAX_UINT_BITS(length), 1, i);
}
}
if (sps->vui.vcl_hrd_parameters_present_flag) {
for (i = 0; i <= sps->vui.vcl_hrd_parameters.cpb_cnt_minus1; i++) {
length = sps->vui.vcl_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;
xu(length, initial_cpb_removal_delay[SchedSelIdx],
current->vcl.initial_cpb_removal_delay[i],
1, MAX_UINT_BITS(length), 1, i);
xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],
current->vcl.initial_cpb_removal_delay_offset[i],
0, MAX_UINT_BITS(length), 1, i);
}
}
return 0;
}
static int FUNC(sei_pic_timestamp)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPicTimestamp *current,
const H264RawSPS *sps)
{
uint8_t time_offset_length;
int err;
u(2, ct_type, 0, 2);
flag(nuit_field_based_flag);
u(5, counting_type, 0, 6);
flag(full_timestamp_flag);
flag(discontinuity_flag);
flag(cnt_dropped_flag);
ub(8, n_frames);
if (current->full_timestamp_flag) {
u(6, seconds_value, 0, 59);
u(6, minutes_value, 0, 59);
u(5, hours_value, 0, 23);
} else {
flag(seconds_flag);
if (current->seconds_flag) {
u(6, seconds_value, 0, 59);
flag(minutes_flag);
if (current->minutes_flag) {
u(6, minutes_value, 0, 59);
flag(hours_flag);
if (current->hours_flag)
u(5, hours_value, 0, 23);
}
}
}
if (sps->vui.nal_hrd_parameters_present_flag)
time_offset_length = sps->vui.nal_hrd_parameters.time_offset_length;
else if (sps->vui.vcl_hrd_parameters_present_flag)
time_offset_length = sps->vui.vcl_hrd_parameters.time_offset_length;
else
time_offset_length = 24;
if (time_offset_length > 0)
ib(time_offset_length, time_offset);
else
infer(time_offset, 0);
return 0;
}
SEI_FUNC(sei_pic_timing, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPicTiming *current, SEIMessageState *sei))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
int err;
HEADER("Picture Timing");
sps = h264->active_sps;
if (!sps) {
// If there is exactly one possible SPS but it is not yet active
// then just assume that it should be the active one.
int i, k = -1;
for (i = 0; i < H264_MAX_SPS_COUNT; i++) {
if (h264->sps[i]) {
if (k >= 0) {
k = -1;
break;
}
k = i;
}
}
if (k >= 0)
sps = h264->sps[k];
}
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"No active SPS for pic_timing.\n");
return AVERROR_INVALIDDATA;
}
if (sps->vui.nal_hrd_parameters_present_flag ||
sps->vui.vcl_hrd_parameters_present_flag) {
const H264RawHRD *hrd;
if (sps->vui.nal_hrd_parameters_present_flag)
hrd = &sps->vui.nal_hrd_parameters;
else if (sps->vui.vcl_hrd_parameters_present_flag)
hrd = &sps->vui.vcl_hrd_parameters;
else {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"No HRD parameters for pic_timing.\n");
return AVERROR_INVALIDDATA;
}
ub(hrd->cpb_removal_delay_length_minus1 + 1, cpb_removal_delay);
ub(hrd->dpb_output_delay_length_minus1 + 1, dpb_output_delay);
}
if (sps->vui.pic_struct_present_flag) {
static const uint8_t num_clock_ts[9] = {
1, 1, 1, 2, 2, 3, 3, 2, 3
};
int i;
u(4, pic_struct, 0, 8);
if (current->pic_struct > 8)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_clock_ts[current->pic_struct]; i++) {
flags(clock_timestamp_flag[i], 1, i);
if (current->clock_timestamp_flag[i])
CHECK(FUNC(sei_pic_timestamp)(ctx, rw,
&current->timestamp[i], sps));
}
}
return 0;
}
SEI_FUNC(sei_pan_scan_rect, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPanScanRect *current,
SEIMessageState *sei))
{
int err, i;
HEADER("Pan-Scan Rectangle");
ue(pan_scan_rect_id, 0, UINT32_MAX - 1);
flag(pan_scan_rect_cancel_flag);
if (!current->pan_scan_rect_cancel_flag) {
ue(pan_scan_cnt_minus1, 0, 2);
for (i = 0; i <= current->pan_scan_cnt_minus1; i++) {
ses(pan_scan_rect_left_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
ses(pan_scan_rect_right_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
ses(pan_scan_rect_top_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
ses(pan_scan_rect_bottom_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
}
ue(pan_scan_rect_repetition_period, 0, 16384);
}
return 0;
}
SEI_FUNC(sei_recovery_point, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIRecoveryPoint *current,
SEIMessageState *sei))
{
int err;
HEADER("Recovery Point");
ue(recovery_frame_cnt, 0, 65535);
flag(exact_match_flag);
flag(broken_link_flag);
u(2, changing_slice_group_idc, 0, 2);
return 0;
}
SEI_FUNC(film_grain_characteristics, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawFilmGrainCharacteristics *current,
SEIMessageState *state))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
int err, c, i, j;
HEADER("Film Grain Characteristics");
sps = h264->active_sps;
if (!sps) {
// If there is exactly one possible SPS but it is not yet active
// then just assume that it should be the active one.
int i, k = -1;
for (i = 0; i < H264_MAX_SPS_COUNT; i++) {
if (h264->sps[i]) {
if (k >= 0) {
k = -1;
break;
}
k = i;
}
}
if (k >= 0)
sps = h264->sps[k];
}
flag(film_grain_characteristics_cancel_flag);
if (!current->film_grain_characteristics_cancel_flag) {
int filmGrainBitDepth[3];
u(2, film_grain_model_id, 0, 1);
flag(separate_colour_description_present_flag);
if (current->separate_colour_description_present_flag) {
ub(3, film_grain_bit_depth_luma_minus8);
ub(3, film_grain_bit_depth_chroma_minus8);
flag(film_grain_full_range_flag);
ub(8, film_grain_colour_primaries);
ub(8, film_grain_transfer_characteristics);
ub(8, film_grain_matrix_coefficients);
} else {
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"No active SPS for film_grain_characteristics.\n");
return AVERROR_INVALIDDATA;
}
infer(film_grain_bit_depth_luma_minus8, sps->bit_depth_luma_minus8);
infer(film_grain_bit_depth_chroma_minus8, sps->bit_depth_chroma_minus8);
infer(film_grain_full_range_flag, sps->vui.video_full_range_flag);
infer(film_grain_colour_primaries, sps->vui.colour_primaries);
infer(film_grain_transfer_characteristics, sps->vui.transfer_characteristics);
infer(film_grain_matrix_coefficients, sps->vui.matrix_coefficients);
}
filmGrainBitDepth[0] = current->film_grain_bit_depth_luma_minus8 + 8;
filmGrainBitDepth[1] =
filmGrainBitDepth[2] = current->film_grain_bit_depth_chroma_minus8 + 8;
u(2, blending_mode_id, 0, 1);
ub(4, log2_scale_factor);
for (c = 0; c < 3; c++)
flags(comp_model_present_flag[c], 1, c);
for (c = 0; c < 3; c++) {
if (current->comp_model_present_flag[c]) {
ubs(8, num_intensity_intervals_minus1[c], 1, c);
us(3, num_model_values_minus1[c], 0, 5, 1, c);
for (i = 0; i <= current->num_intensity_intervals_minus1[c]; i++) {
ubs(8, intensity_interval_lower_bound[c][i], 2, c, i);
ubs(8, intensity_interval_upper_bound[c][i], 2, c, i);
for (j = 0; j <= current->num_model_values_minus1[c]; j++)
ses(comp_model_value[c][i][j], 0 - current->film_grain_model_id * (1 << (filmGrainBitDepth[c] - 1)),
((1 << filmGrainBitDepth[c]) - 1) - current->film_grain_model_id * (1 << (filmGrainBitDepth[c] - 1)),
3, c, i, j);
}
}
}
ue(film_grain_characteristics_repetition_period, 0, 16384);
}
return 0;
}
SEI_FUNC(sei_display_orientation, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIDisplayOrientation *current,
SEIMessageState *sei))
{
int err;
HEADER("Display Orientation");
flag(display_orientation_cancel_flag);
if (!current->display_orientation_cancel_flag) {
flag(hor_flip);
flag(ver_flip);
ub(16, anticlockwise_rotation);
ue(display_orientation_repetition_period, 0, 16384);
flag(display_orientation_extension_flag);
}
return 0;
}
static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEI *current)
{
int err;
HEADER("Supplemental Enhancement Information");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_SEI));
CHECK(FUNC_SEI(message_list)(ctx, rw, &current->message_list, 1));
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawAUD *current)
{
int err;
HEADER("Access Unit Delimiter");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_AUD));
ub(3, primary_pic_type);
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
static int FUNC(ref_pic_list_modification)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSliceHeader *current)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps = h264->active_sps;
int err, i, mopn;
if (current->slice_type % 5 != 2 &&
current->slice_type % 5 != 4) {
flag(ref_pic_list_modification_flag_l0);
if (current->ref_pic_list_modification_flag_l0) {
for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {
xue(modification_of_pic_nums_idc,
current->rplm_l0[i].modification_of_pic_nums_idc, 0, 3, 0);
mopn = current->rplm_l0[i].modification_of_pic_nums_idc;
if (mopn == 3)
break;
if (mopn == 0 || mopn == 1)
xue(abs_diff_pic_num_minus1,
current->rplm_l0[i].abs_diff_pic_num_minus1,
0, (1 + current->field_pic_flag) *
(1 << (sps->log2_max_frame_num_minus4 + 4)), 0);
else if (mopn == 2)
xue(long_term_pic_num,
current->rplm_l0[i].long_term_pic_num,
0, sps->max_num_ref_frames - 1, 0);
}
}
}
if (current->slice_type % 5 == 1) {
flag(ref_pic_list_modification_flag_l1);
if (current->ref_pic_list_modification_flag_l1) {
for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {
xue(modification_of_pic_nums_idc,
current->rplm_l1[i].modification_of_pic_nums_idc, 0, 3, 0);
mopn = current->rplm_l1[i].modification_of_pic_nums_idc;
if (mopn == 3)
break;
if (mopn == 0 || mopn == 1)
xue(abs_diff_pic_num_minus1,
current->rplm_l1[i].abs_diff_pic_num_minus1,
0, (1 + current->field_pic_flag) *
(1 << (sps->log2_max_frame_num_minus4 + 4)), 0);
else if (mopn == 2)
xue(long_term_pic_num,
current->rplm_l1[i].long_term_pic_num,
0, sps->max_num_ref_frames - 1, 0);
}
}
}
return 0;
}
static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSliceHeader *current)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps = h264->active_sps;
int chroma;
int err, i, j;
ue(luma_log2_weight_denom, 0, 7);
chroma = !sps->separate_colour_plane_flag && sps->chroma_format_idc != 0;
if (chroma)
ue(chroma_log2_weight_denom, 0, 7);
for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
flags(luma_weight_l0_flag[i], 1, i);
if (current->luma_weight_l0_flag[i]) {
ses(luma_weight_l0[i], -128, +127, 1, i);
ses(luma_offset_l0[i], -128, +127, 1, i);
}
if (chroma) {
flags(chroma_weight_l0_flag[i], 1, i);
if (current->chroma_weight_l0_flag[i]) {
for (j = 0; j < 2; j++) {
ses(chroma_weight_l0[i][j], -128, +127, 2, i, j);
ses(chroma_offset_l0[i][j], -128, +127, 2, i, j);
}
}
}
}
if (current->slice_type % 5 == 1) {
for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
flags(luma_weight_l1_flag[i], 1, i);
if (current->luma_weight_l1_flag[i]) {
ses(luma_weight_l1[i], -128, +127, 1, i);
ses(luma_offset_l1[i], -128, +127, 1, i);
}
if (chroma) {
flags(chroma_weight_l1_flag[i], 1, i);
if (current->chroma_weight_l1_flag[i]) {
for (j = 0; j < 2; j++) {
ses(chroma_weight_l1[i][j], -128, +127, 2, i, j);
ses(chroma_offset_l1[i][j], -128, +127, 2, i, j);
}
}
}
}
}
return 0;
}
static int FUNC(dec_ref_pic_marking)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSliceHeader *current, int idr_pic_flag)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps = h264->active_sps;
int err, i;
uint32_t mmco;
if (idr_pic_flag) {
flag(no_output_of_prior_pics_flag);
flag(long_term_reference_flag);
} else {
flag(adaptive_ref_pic_marking_mode_flag);
if (current->adaptive_ref_pic_marking_mode_flag) {
for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
xue(memory_management_control_operation,
current->mmco[i].memory_management_control_operation,
0, 6, 0);
mmco = current->mmco[i].memory_management_control_operation;
if (mmco == 0)
break;
if (mmco == 1 || mmco == 3)
xue(difference_of_pic_nums_minus1,
current->mmco[i].difference_of_pic_nums_minus1,
0, INT32_MAX, 0);
if (mmco == 2)
xue(long_term_pic_num,
current->mmco[i].long_term_pic_num,
0, sps->max_num_ref_frames - 1, 0);
if (mmco == 3 || mmco == 6)
xue(long_term_frame_idx,
current->mmco[i].long_term_frame_idx,
0, sps->max_num_ref_frames - 1, 0);
if (mmco == 4)
xue(max_long_term_frame_idx_plus1,
current->mmco[i].max_long_term_frame_idx_plus1,
0, sps->max_num_ref_frames, 0);
}
if (i == H264_MAX_MMCO_COUNT) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many "
"memory management control operations.\n");
return AVERROR_INVALIDDATA;
}
}
}
return 0;
}
static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSliceHeader *current)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
const H264RawPPS *pps;
int err;
int idr_pic_flag;
int slice_type_i, slice_type_p, slice_type_b;
int slice_type_si, slice_type_sp;
HEADER("Slice Header");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_SLICE |
1 << H264_NAL_IDR_SLICE |
1 << H264_NAL_AUXILIARY_SLICE));
if (current->nal_unit_header.nal_unit_type == H264_NAL_AUXILIARY_SLICE) {
if (!h264->last_slice_nal_unit_type) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Auxiliary slice "
"is not decodable without the main picture "
"in the same access unit.\n");
return AVERROR_INVALIDDATA;
}
idr_pic_flag = h264->last_slice_nal_unit_type == H264_NAL_IDR_SLICE;
} else {
idr_pic_flag = current->nal_unit_header.nal_unit_type == H264_NAL_IDR_SLICE;
}
ue(first_mb_in_slice, 0, H264_MAX_MB_PIC_SIZE - 1);
ue(slice_type, 0, 9);
slice_type_i = current->slice_type % 5 == 2;
slice_type_p = current->slice_type % 5 == 0;
slice_type_b = current->slice_type % 5 == 1;
slice_type_si = current->slice_type % 5 == 4;
slice_type_sp = current->slice_type % 5 == 3;
if (idr_pic_flag && !(slice_type_i || slice_type_si)) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid slice type %d "
"for IDR picture.\n", current->slice_type);
return AVERROR_INVALIDDATA;
}
ue(pic_parameter_set_id, 0, 255);
pps = h264->pps[current->pic_parameter_set_id];
if (!pps) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
current->pic_parameter_set_id);
return AVERROR_INVALIDDATA;
}
h264->active_pps = pps;
sps = h264->sps[pps->seq_parameter_set_id];
if (!sps) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
pps->seq_parameter_set_id);
return AVERROR_INVALIDDATA;
}
h264->active_sps = sps;
if (sps->separate_colour_plane_flag)
u(2, colour_plane_id, 0, 2);
ub(sps->log2_max_frame_num_minus4 + 4, frame_num);
if (!sps->frame_mbs_only_flag) {
flag(field_pic_flag);
if (current->field_pic_flag)
flag(bottom_field_flag);
else
infer(bottom_field_flag, 0);
} else {
infer(field_pic_flag, 0);
infer(bottom_field_flag, 0);
}
if (idr_pic_flag)
ue(idr_pic_id, 0, 65535);
if (sps->pic_order_cnt_type == 0) {
ub(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, pic_order_cnt_lsb);
if (pps->bottom_field_pic_order_in_frame_present_flag &&
!current->field_pic_flag)
se(delta_pic_order_cnt_bottom, INT32_MIN + 1, INT32_MAX);
} else if (sps->pic_order_cnt_type == 1) {
if (!sps->delta_pic_order_always_zero_flag) {
se(delta_pic_order_cnt[0], INT32_MIN + 1, INT32_MAX);
if (pps->bottom_field_pic_order_in_frame_present_flag &&
!current->field_pic_flag)
se(delta_pic_order_cnt[1], INT32_MIN + 1, INT32_MAX);
else
infer(delta_pic_order_cnt[1], 0);
} else {
infer(delta_pic_order_cnt[0], 0);
infer(delta_pic_order_cnt[1], 0);
}
}
if (pps->redundant_pic_cnt_present_flag)
ue(redundant_pic_cnt, 0, 127);
else
infer(redundant_pic_cnt, 0);
if (current->nal_unit_header.nal_unit_type != H264_NAL_AUXILIARY_SLICE
&& !current->redundant_pic_cnt)
h264->last_slice_nal_unit_type =
current->nal_unit_header.nal_unit_type;
if (slice_type_b)
flag(direct_spatial_mv_pred_flag);
if (slice_type_p || slice_type_sp || slice_type_b) {
flag(num_ref_idx_active_override_flag);
if (current->num_ref_idx_active_override_flag) {
ue(num_ref_idx_l0_active_minus1, 0, 31);
if (slice_type_b)
ue(num_ref_idx_l1_active_minus1, 0, 31);
} else {
infer(num_ref_idx_l0_active_minus1,
pps->num_ref_idx_l0_default_active_minus1);
infer(num_ref_idx_l1_active_minus1,
pps->num_ref_idx_l1_default_active_minus1);
}
}
if (current->nal_unit_header.nal_unit_type == 20 ||
current->nal_unit_header.nal_unit_type == 21) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC / 3DAVC not supported.\n");
return AVERROR_PATCHWELCOME;
} else {
CHECK(FUNC(ref_pic_list_modification)(ctx, rw, current));
}
if ((pps->weighted_pred_flag && (slice_type_p || slice_type_sp)) ||
(pps->weighted_bipred_idc == 1 && slice_type_b)) {
CHECK(FUNC(pred_weight_table)(ctx, rw, current));
}
if (current->nal_unit_header.nal_ref_idc != 0) {
CHECK(FUNC(dec_ref_pic_marking)(ctx, rw, current, idr_pic_flag));
}
if (pps->entropy_coding_mode_flag &&
!slice_type_i && !slice_type_si) {
ue(cabac_init_idc, 0, 2);
}
se(slice_qp_delta, - 51 - 6 * sps->bit_depth_luma_minus8,
+ 51 + 6 * sps->bit_depth_luma_minus8);
if (slice_type_sp || slice_type_si) {
if (slice_type_sp)
flag(sp_for_switch_flag);
se(slice_qs_delta, -51, +51);
}
if (pps->deblocking_filter_control_present_flag) {
ue(disable_deblocking_filter_idc, 0, 2);
if (current->disable_deblocking_filter_idc != 1) {
se(slice_alpha_c0_offset_div2, -6, +6);
se(slice_beta_offset_div2, -6, +6);
} else {
infer(slice_alpha_c0_offset_div2, 0);
infer(slice_beta_offset_div2, 0);
}
} else {
infer(disable_deblocking_filter_idc, 0);
infer(slice_alpha_c0_offset_div2, 0);
infer(slice_beta_offset_div2, 0);
}
if (pps->num_slice_groups_minus1 > 0 &&
pps->slice_group_map_type >= 3 &&
pps->slice_group_map_type <= 5) {
unsigned int pic_size, max, bits;
pic_size = (sps->pic_width_in_mbs_minus1 + 1) *
(sps->pic_height_in_map_units_minus1 + 1);
max = (pic_size + pps->slice_group_change_rate_minus1) /
(pps->slice_group_change_rate_minus1 + 1);
bits = av_ceil_log2(max + 1);
u(bits, slice_group_change_cycle, 0, max);
}
if (pps->entropy_coding_mode_flag) {
while (byte_alignment(rw))
fixed(1, cabac_alignment_one_bit, 1);
}
return 0;
}
static int FUNC(filler)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawFiller *current)
{
int err;
HEADER("Filler Data");
CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1 << H264_NAL_FILLER_DATA));
#ifdef READ
while (show_bits(rw, 8) == 0xff) {
fixed(8, ff_byte, 0xff);
++current->filler_size;
}
#else
{
uint32_t i;
for (i = 0; i < current->filler_size; i++)
fixed(8, ff_byte, 0xff);
}
#endif
CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
return 0;
}
static int FUNC(end_of_sequence)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawNALUnitHeader *current)
{
HEADER("End of Sequence");
return FUNC(nal_unit_header)(ctx, rw, current,
1 << H264_NAL_END_SEQUENCE);
}
static int FUNC(end_of_stream)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawNALUnitHeader *current)
{
HEADER("End of Stream");
return FUNC(nal_unit_header)(ctx, rw, current,
1 << H264_NAL_END_STREAM);
}
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