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FFmpeg/libavcodec/h264_ps.c
Andreas Rheinhardt 8bf18018a3 avcodec/(h264|hevc)_ps: Factor common VUI code out 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-12-01 11:00:41 +01:00

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/*
* H.26L/H.264/AVC/JVT/14496-10/... parameter set decoding
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
/**
* @file
* H.264 / AVC / MPEG-4 part10 parameter set decoding.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include <inttypes.h>
#include "libavutil/imgutils.h"
#include "mathops.h"
#include "avcodec.h"
#include "h264data.h"
#include "h2645_vui.h"
#include "h264_ps.h"
#include "golomb.h"
#define MIN_LOG2_MAX_FRAME_NUM 4
static const uint8_t default_scaling4[2][16] = {
{ 6, 13, 20, 28, 13, 20, 28, 32,
20, 28, 32, 37, 28, 32, 37, 42 },
{ 10, 14, 20, 24, 14, 20, 24, 27,
20, 24, 27, 30, 24, 27, 30, 34 }
};
static const uint8_t default_scaling8[2][64] = {
{ 6, 10, 13, 16, 18, 23, 25, 27,
10, 11, 16, 18, 23, 25, 27, 29,
13, 16, 18, 23, 25, 27, 29, 31,
16, 18, 23, 25, 27, 29, 31, 33,
18, 23, 25, 27, 29, 31, 33, 36,
23, 25, 27, 29, 31, 33, 36, 38,
25, 27, 29, 31, 33, 36, 38, 40,
27, 29, 31, 33, 36, 38, 40, 42 },
{ 9, 13, 15, 17, 19, 21, 22, 24,
13, 13, 17, 19, 21, 22, 24, 25,
15, 17, 19, 21, 22, 24, 25, 27,
17, 19, 21, 22, 24, 25, 27, 28,
19, 21, 22, 24, 25, 27, 28, 30,
21, 22, 24, 25, 27, 28, 30, 32,
22, 24, 25, 27, 28, 30, 32, 33,
24, 25, 27, 28, 30, 32, 33, 35 }
};
/* maximum number of MBs in the DPB for a given level */
static const int level_max_dpb_mbs[][2] = {
{ 10, 396 },
{ 11, 900 },
{ 12, 2376 },
{ 13, 2376 },
{ 20, 2376 },
{ 21, 4752 },
{ 22, 8100 },
{ 30, 8100 },
{ 31, 18000 },
{ 32, 20480 },
{ 40, 32768 },
{ 41, 32768 },
{ 42, 34816 },
{ 50, 110400 },
{ 51, 184320 },
{ 52, 184320 },
};
static void remove_pps(H264ParamSets *s, int id)
{
av_buffer_unref(&s->pps_list[id]);
}
static void remove_sps(H264ParamSets *s, int id)
{
#if 0
int i;
if (s->sps_list[id]) {
/* drop all PPS that depend on this SPS */
for (i = 0; i < FF_ARRAY_ELEMS(s->pps_list); i++)
if (s->pps_list[i] && ((PPS*)s->pps_list[i]->data)->sps_id == id)
remove_pps(s, i);
}
#endif
av_buffer_unref(&s->sps_list[id]);
}
static inline int decode_hrd_parameters(GetBitContext *gb, void *logctx,
SPS *sps)
{
int cpb_count, i;
cpb_count = get_ue_golomb_31(gb) + 1;
if (cpb_count > 32U) {
av_log(logctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
return AVERROR_INVALIDDATA;
}
get_bits(gb, 4); /* bit_rate_scale */
get_bits(gb, 4); /* cpb_size_scale */
for (i = 0; i < cpb_count; i++) {
get_ue_golomb_long(gb); /* bit_rate_value_minus1 */
get_ue_golomb_long(gb); /* cpb_size_value_minus1 */
get_bits1(gb); /* cbr_flag */
}
sps->initial_cpb_removal_delay_length = get_bits(gb, 5) + 1;
sps->cpb_removal_delay_length = get_bits(gb, 5) + 1;
sps->dpb_output_delay_length = get_bits(gb, 5) + 1;
sps->time_offset_length = get_bits(gb, 5);
sps->cpb_cnt = cpb_count;
return 0;
}
static inline int decode_vui_parameters(GetBitContext *gb, void *logctx,
SPS *sps)
{
ff_h2645_decode_common_vui_params(gb, &sps->vui, logctx);
if (show_bits1(gb) && get_bits_left(gb) < 10) {
av_log(logctx, AV_LOG_WARNING, "Truncated VUI (%d)\n", get_bits_left(gb));
return 0;
}
sps->timing_info_present_flag = get_bits1(gb);
if (sps->timing_info_present_flag) {
unsigned num_units_in_tick = get_bits_long(gb, 32);
unsigned time_scale = get_bits_long(gb, 32);
if (!num_units_in_tick || !time_scale) {
av_log(logctx, AV_LOG_ERROR,
"time_scale/num_units_in_tick invalid or unsupported (%u/%u)\n",
time_scale, num_units_in_tick);
sps->timing_info_present_flag = 0;
} else {
sps->num_units_in_tick = num_units_in_tick;
sps->time_scale = time_scale;
}
sps->fixed_frame_rate_flag = get_bits1(gb);
}
sps->nal_hrd_parameters_present_flag = get_bits1(gb);
if (sps->nal_hrd_parameters_present_flag)
if (decode_hrd_parameters(gb, logctx, sps) < 0)
return AVERROR_INVALIDDATA;
sps->vcl_hrd_parameters_present_flag = get_bits1(gb);
if (sps->vcl_hrd_parameters_present_flag)
if (decode_hrd_parameters(gb, logctx, sps) < 0)
return AVERROR_INVALIDDATA;
if (sps->nal_hrd_parameters_present_flag ||
sps->vcl_hrd_parameters_present_flag)
get_bits1(gb); /* low_delay_hrd_flag */
sps->pic_struct_present_flag = get_bits1(gb);
if (!get_bits_left(gb))
return 0;
sps->bitstream_restriction_flag = get_bits1(gb);
if (sps->bitstream_restriction_flag) {
get_bits1(gb); /* motion_vectors_over_pic_boundaries_flag */
get_ue_golomb_31(gb); /* max_bytes_per_pic_denom */
get_ue_golomb_31(gb); /* max_bits_per_mb_denom */
get_ue_golomb_31(gb); /* log2_max_mv_length_horizontal */
get_ue_golomb_31(gb); /* log2_max_mv_length_vertical */
sps->num_reorder_frames = get_ue_golomb_31(gb);
get_ue_golomb_31(gb); /*max_dec_frame_buffering*/
if (get_bits_left(gb) < 0) {
sps->num_reorder_frames = 0;
sps->bitstream_restriction_flag = 0;
}
if (sps->num_reorder_frames > 16U
/* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
av_log(logctx, AV_LOG_ERROR,
"Clipping illegal num_reorder_frames %d\n",
sps->num_reorder_frames);
sps->num_reorder_frames = 16;
return AVERROR_INVALIDDATA;
}
}
return 0;
}
static int decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
const uint8_t *jvt_list,
const uint8_t *fallback_list)
{
int i, last = 8, next = 8;
const uint8_t *scan = size == 16 ? ff_zigzag_scan : ff_zigzag_direct;
if (!get_bits1(gb)) /* matrix not written, we use the predicted one */
memcpy(factors, fallback_list, size * sizeof(uint8_t));
else
for (i = 0; i < size; i++) {
if (next) {
int v = get_se_golomb(gb);
if (v < -128 || v > 127) {
av_log(NULL, AV_LOG_ERROR, "delta scale %d is invalid\n", v);
return AVERROR_INVALIDDATA;
}
next = (last + v) & 0xff;
}
if (!i && !next) { /* matrix not written, we use the preset one */
memcpy(factors, jvt_list, size * sizeof(uint8_t));
break;
}
last = factors[scan[i]] = next ? next : last;
}
return 0;
}
/* returns non zero if the provided SPS scaling matrix has been filled */
static int decode_scaling_matrices(GetBitContext *gb, const SPS *sps,
const PPS *pps, int is_sps,
uint8_t(*scaling_matrix4)[16],
uint8_t(*scaling_matrix8)[64])
{
int fallback_sps = !is_sps && sps->scaling_matrix_present;
const uint8_t *fallback[4] = {
fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
};
int ret = 0;
if (get_bits1(gb)) {
ret |= decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
ret |= decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
ret |= decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
ret |= decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
ret |= decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
ret |= decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
if (is_sps || pps->transform_8x8_mode) {
ret |= decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
ret |= decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
if (sps->chroma_format_idc == 3) {
ret |= decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
ret |= decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
ret |= decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
ret |= decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
}
}
if (!ret)
ret = is_sps;
}
return ret;
}
void ff_h264_ps_uninit(H264ParamSets *ps)
{
int i;
for (i = 0; i < MAX_SPS_COUNT; i++)
av_buffer_unref(&ps->sps_list[i]);
for (i = 0; i < MAX_PPS_COUNT; i++)
av_buffer_unref(&ps->pps_list[i]);
av_buffer_unref(&ps->pps_ref);
ps->pps = NULL;
ps->sps = NULL;
}
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
H264ParamSets *ps, int ignore_truncation)
{
AVBufferRef *sps_buf;
int profile_idc, level_idc, constraint_set_flags = 0;
unsigned int sps_id;
int i, log2_max_frame_num_minus4;
SPS *sps;
int ret;
sps_buf = av_buffer_allocz(sizeof(*sps));
if (!sps_buf)
return AVERROR(ENOMEM);
sps = (SPS*)sps_buf->data;
sps->data_size = gb->buffer_end - gb->buffer;
if (sps->data_size > sizeof(sps->data)) {
av_log(avctx, AV_LOG_DEBUG, "Truncating likely oversized SPS\n");
sps->data_size = sizeof(sps->data);
}
memcpy(sps->data, gb->buffer, sps->data_size);
// Re-add the removed stop bit (may be used by hwaccels).
if (!(gb->size_in_bits & 7) && sps->data_size < sizeof(sps->data))
sps->data[sps->data_size++] = 0x80;
profile_idc = get_bits(gb, 8);
constraint_set_flags |= get_bits1(gb) << 0; // constraint_set0_flag
constraint_set_flags |= get_bits1(gb) << 1; // constraint_set1_flag
constraint_set_flags |= get_bits1(gb) << 2; // constraint_set2_flag
constraint_set_flags |= get_bits1(gb) << 3; // constraint_set3_flag
constraint_set_flags |= get_bits1(gb) << 4; // constraint_set4_flag
constraint_set_flags |= get_bits1(gb) << 5; // constraint_set5_flag
skip_bits(gb, 2); // reserved_zero_2bits
level_idc = get_bits(gb, 8);
sps_id = get_ue_golomb_31(gb);
if (sps_id >= MAX_SPS_COUNT) {
av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
goto fail;
}
sps->sps_id = sps_id;
sps->time_offset_length = 24;
sps->profile_idc = profile_idc;
sps->constraint_set_flags = constraint_set_flags;
sps->level_idc = level_idc;
sps->vui.video_full_range_flag = -1;
memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
sps->scaling_matrix_present = 0;
sps->vui.matrix_coeffs = AVCOL_SPC_UNSPECIFIED;
if (sps->profile_idc == 100 || // High profile
sps->profile_idc == 110 || // High10 profile
sps->profile_idc == 122 || // High422 profile
sps->profile_idc == 244 || // High444 Predictive profile
sps->profile_idc == 44 || // Cavlc444 profile
sps->profile_idc == 83 || // Scalable Constrained High profile (SVC)
sps->profile_idc == 86 || // Scalable High Intra profile (SVC)
sps->profile_idc == 118 || // Stereo High profile (MVC)
sps->profile_idc == 128 || // Multiview High profile (MVC)
sps->profile_idc == 138 || // Multiview Depth High profile (MVCD)
sps->profile_idc == 144) { // old High444 profile
sps->chroma_format_idc = get_ue_golomb_31(gb);
if (sps->chroma_format_idc > 3U) {
avpriv_request_sample(avctx, "chroma_format_idc %u",
sps->chroma_format_idc);
goto fail;
} else if (sps->chroma_format_idc == 3) {
sps->residual_color_transform_flag = get_bits1(gb);
if (sps->residual_color_transform_flag) {
av_log(avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
goto fail;
}
}
sps->bit_depth_luma = get_ue_golomb_31(gb) + 8;
sps->bit_depth_chroma = get_ue_golomb_31(gb) + 8;
if (sps->bit_depth_chroma != sps->bit_depth_luma) {
avpriv_request_sample(avctx,
"Different chroma and luma bit depth");
goto fail;
}
if (sps->bit_depth_luma < 8 || sps->bit_depth_luma > 14 ||
sps->bit_depth_chroma < 8 || sps->bit_depth_chroma > 14) {
av_log(avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
sps->bit_depth_luma, sps->bit_depth_chroma);
goto fail;
}
sps->transform_bypass = get_bits1(gb);
ret = decode_scaling_matrices(gb, sps, NULL, 1,
sps->scaling_matrix4, sps->scaling_matrix8);
if (ret < 0)
goto fail;
sps->scaling_matrix_present |= ret;
} else {
sps->chroma_format_idc = 1;
sps->bit_depth_luma = 8;
sps->bit_depth_chroma = 8;
}
log2_max_frame_num_minus4 = get_ue_golomb_31(gb);
if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
av_log(avctx, AV_LOG_ERROR,
"log2_max_frame_num_minus4 out of range (0-12): %d\n",
log2_max_frame_num_minus4);
goto fail;
}
sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
sps->poc_type = get_ue_golomb_31(gb);
if (sps->poc_type == 0) { // FIXME #define
unsigned t = get_ue_golomb_31(gb);
if (t>12) {
av_log(avctx, AV_LOG_ERROR, "log2_max_poc_lsb (%d) is out of range\n", t);
goto fail;
}
sps->log2_max_poc_lsb = t + 4;
} else if (sps->poc_type == 1) { // FIXME #define
sps->delta_pic_order_always_zero_flag = get_bits1(gb);
sps->offset_for_non_ref_pic = get_se_golomb_long(gb);
sps->offset_for_top_to_bottom_field = get_se_golomb_long(gb);
if ( sps->offset_for_non_ref_pic == INT32_MIN
|| sps->offset_for_top_to_bottom_field == INT32_MIN
) {
av_log(avctx, AV_LOG_ERROR,
"offset_for_non_ref_pic or offset_for_top_to_bottom_field is out of range\n");
goto fail;
}
sps->poc_cycle_length = get_ue_golomb(gb);
if ((unsigned)sps->poc_cycle_length >=
FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
av_log(avctx, AV_LOG_ERROR,
"poc_cycle_length overflow %d\n", sps->poc_cycle_length);
goto fail;
}
for (i = 0; i < sps->poc_cycle_length; i++) {
sps->offset_for_ref_frame[i] = get_se_golomb_long(gb);
if (sps->offset_for_ref_frame[i] == INT32_MIN) {
av_log(avctx, AV_LOG_ERROR,
"offset_for_ref_frame is out of range\n");
goto fail;
}
}
} else if (sps->poc_type != 2) {
av_log(avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
goto fail;
}
sps->ref_frame_count = get_ue_golomb_31(gb);
if (avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
if (sps->ref_frame_count > H264_MAX_DPB_FRAMES) {
av_log(avctx, AV_LOG_ERROR,
"too many reference frames %d\n", sps->ref_frame_count);
goto fail;
}
sps->gaps_in_frame_num_allowed_flag = get_bits1(gb);
sps->mb_width = get_ue_golomb(gb) + 1;
sps->mb_height = get_ue_golomb(gb) + 1;
sps->frame_mbs_only_flag = get_bits1(gb);
if (sps->mb_height >= INT_MAX / 2U) {
av_log(avctx, AV_LOG_ERROR, "height overflow\n");
goto fail;
}
sps->mb_height *= 2 - sps->frame_mbs_only_flag;
if (!sps->frame_mbs_only_flag)
sps->mb_aff = get_bits1(gb);
else
sps->mb_aff = 0;
if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
(unsigned)sps->mb_height >= INT_MAX / 16 ||
av_image_check_size(16 * sps->mb_width,
16 * sps->mb_height, 0, avctx)) {
av_log(avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
goto fail;
}
sps->direct_8x8_inference_flag = get_bits1(gb);
sps->crop = get_bits1(gb);
if (sps->crop) {
unsigned int crop_left = get_ue_golomb(gb);
unsigned int crop_right = get_ue_golomb(gb);
unsigned int crop_top = get_ue_golomb(gb);
unsigned int crop_bottom = get_ue_golomb(gb);
int width = 16 * sps->mb_width;
int height = 16 * sps->mb_height;
if (avctx->flags2 & AV_CODEC_FLAG2_IGNORE_CROP) {
av_log(avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
"values are l:%d r:%d t:%d b:%d\n",
crop_left, crop_right, crop_top, crop_bottom);
sps->crop_left =
sps->crop_right =
sps->crop_top =
sps->crop_bottom = 0;
} else {
int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
int hsub = (sps->chroma_format_idc == 1 ||
sps->chroma_format_idc == 2) ? 1 : 0;
int step_x = 1 << hsub;
int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
if (crop_left > (unsigned)INT_MAX / 4 / step_x ||
crop_right > (unsigned)INT_MAX / 4 / step_x ||
crop_top > (unsigned)INT_MAX / 4 / step_y ||
crop_bottom> (unsigned)INT_MAX / 4 / step_y ||
(crop_left + crop_right ) * step_x >= width ||
(crop_top + crop_bottom) * step_y >= height
) {
av_log(avctx, AV_LOG_ERROR, "crop values invalid %d %d %d %d / %d %d\n", crop_left, crop_right, crop_top, crop_bottom, width, height);
goto fail;
}
sps->crop_left = crop_left * step_x;
sps->crop_right = crop_right * step_x;
sps->crop_top = crop_top * step_y;
sps->crop_bottom = crop_bottom * step_y;
}
} else {
sps->crop_left =
sps->crop_right =
sps->crop_top =
sps->crop_bottom =
sps->crop = 0;
}
sps->vui_parameters_present_flag = get_bits1(gb);
if (sps->vui_parameters_present_flag) {
int ret = decode_vui_parameters(gb, avctx, sps);
if (ret < 0)
goto fail;
}
if (get_bits_left(gb) < 0) {
av_log_once(avctx, ignore_truncation ? AV_LOG_WARNING : AV_LOG_ERROR, AV_LOG_DEBUG,
&ps->overread_warning_printed[sps->vui_parameters_present_flag],
"Overread %s by %d bits\n", sps->vui_parameters_present_flag ? "VUI" : "SPS", -get_bits_left(gb));
if (!ignore_truncation)
goto fail;
}
/* if the maximum delay is not stored in the SPS, derive it based on the
* level */
if (!sps->bitstream_restriction_flag &&
(sps->ref_frame_count || avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT)) {
sps->num_reorder_frames = H264_MAX_DPB_FRAMES - 1;
for (i = 0; i < FF_ARRAY_ELEMS(level_max_dpb_mbs); i++) {
if (level_max_dpb_mbs[i][0] == sps->level_idc) {
sps->num_reorder_frames = FFMIN(level_max_dpb_mbs[i][1] / (sps->mb_width * sps->mb_height),
sps->num_reorder_frames);
break;
}
}
}
if (!sps->vui.sar.den)
sps->vui.sar.den = 1;
if (avctx->debug & FF_DEBUG_PICT_INFO) {
static const char csp[4][5] = { "Gray", "420", "422", "444" };
av_log(avctx, AV_LOG_DEBUG,
"sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%u/%u/%u/%u %s %s %"PRId32"/%"PRId32" b%d reo:%d\n",
sps_id, sps->profile_idc, sps->level_idc,
sps->poc_type,
sps->ref_frame_count,
sps->mb_width, sps->mb_height,
sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
sps->direct_8x8_inference_flag ? "8B8" : "",
sps->crop_left, sps->crop_right,
sps->crop_top, sps->crop_bottom,
sps->vui_parameters_present_flag ? "VUI" : "",
csp[sps->chroma_format_idc],
sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
sps->timing_info_present_flag ? sps->time_scale : 0,
sps->bit_depth_luma,
sps->bitstream_restriction_flag ? sps->num_reorder_frames : -1
);
}
/* check if this is a repeat of an already parsed SPS, then keep the
* original one.
* otherwise drop all PPSes that depend on it */
if (ps->sps_list[sps_id] &&
!memcmp(ps->sps_list[sps_id]->data, sps_buf->data, sps_buf->size)) {
av_buffer_unref(&sps_buf);
} else {
remove_sps(ps, sps_id);
ps->sps_list[sps_id] = sps_buf;
}
return 0;
fail:
av_buffer_unref(&sps_buf);
return AVERROR_INVALIDDATA;
}
static void init_dequant8_coeff_table(PPS *pps, const SPS *sps)
{
int i, j, q, x;
const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
for (i = 0; i < 6; i++) {
pps->dequant8_coeff[i] = pps->dequant8_buffer[i];
for (j = 0; j < i; j++)
if (!memcmp(pps->scaling_matrix8[j], pps->scaling_matrix8[i],
64 * sizeof(uint8_t))) {
pps->dequant8_coeff[i] = pps->dequant8_buffer[j];
break;
}
if (j < i)
continue;
for (q = 0; q < max_qp + 1; q++) {
int shift = ff_h264_quant_div6[q];
int idx = ff_h264_quant_rem6[q];
for (x = 0; x < 64; x++)
pps->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
((uint32_t)ff_h264_dequant8_coeff_init[idx][ff_h264_dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
pps->scaling_matrix8[i][x]) << shift;
}
}
}
static void init_dequant4_coeff_table(PPS *pps, const SPS *sps)
{
int i, j, q, x;
const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
for (i = 0; i < 6; i++) {
pps->dequant4_coeff[i] = pps->dequant4_buffer[i];
for (j = 0; j < i; j++)
if (!memcmp(pps->scaling_matrix4[j], pps->scaling_matrix4[i],
16 * sizeof(uint8_t))) {
pps->dequant4_coeff[i] = pps->dequant4_buffer[j];
break;
}
if (j < i)
continue;
for (q = 0; q < max_qp + 1; q++) {
int shift = ff_h264_quant_div6[q] + 2;
int idx = ff_h264_quant_rem6[q];
for (x = 0; x < 16; x++)
pps->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
pps->scaling_matrix4[i][x]) << shift;
}
}
}
static void init_dequant_tables(PPS *pps, const SPS *sps)
{
int i, x;
init_dequant4_coeff_table(pps, sps);
memset(pps->dequant8_coeff, 0, sizeof(pps->dequant8_coeff));
if (pps->transform_8x8_mode)
init_dequant8_coeff_table(pps, sps);
if (sps->transform_bypass) {
for (i = 0; i < 6; i++)
for (x = 0; x < 16; x++)
pps->dequant4_coeff[i][0][x] = 1 << 6;
if (pps->transform_8x8_mode)
for (i = 0; i < 6; i++)
for (x = 0; x < 64; x++)
pps->dequant8_coeff[i][0][x] = 1 << 6;
}
}
static void build_qp_table(PPS *pps, int t, int index, const int depth)
{
int i;
const int max_qp = 51 + 6 * (depth - 8);
for (i = 0; i < max_qp + 1; i++)
pps->chroma_qp_table[t][i] =
ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
}
static int more_rbsp_data_in_pps(const SPS *sps, void *logctx)
{
int profile_idc = sps->profile_idc;
if ((profile_idc == 66 || profile_idc == 77 ||
profile_idc == 88) && (sps->constraint_set_flags & 7)) {
av_log(logctx, AV_LOG_VERBOSE,
"Current profile doesn't provide more RBSP data in PPS, skipping\n");
return 0;
}
return 1;
}
static void pps_free(void *opaque, uint8_t *data)
{
PPS *pps = (PPS*)data;
av_buffer_unref(&pps->sps_ref);
av_freep(&data);
}
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
H264ParamSets *ps, int bit_length)
{
AVBufferRef *pps_buf;
const SPS *sps;
unsigned int pps_id = get_ue_golomb(gb);
PPS *pps;
int qp_bd_offset;
int bits_left;
int ret;
if (pps_id >= MAX_PPS_COUNT) {
av_log(avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
return AVERROR_INVALIDDATA;
}
pps = av_mallocz(sizeof(*pps));
if (!pps)
return AVERROR(ENOMEM);
pps_buf = av_buffer_create((uint8_t*)pps, sizeof(*pps),
pps_free, NULL, 0);
if (!pps_buf) {
av_freep(&pps);
return AVERROR(ENOMEM);
}
pps->data_size = gb->buffer_end - gb->buffer;
if (pps->data_size > sizeof(pps->data)) {
av_log(avctx, AV_LOG_DEBUG, "Truncating likely oversized PPS "
"(%"SIZE_SPECIFIER" > %"SIZE_SPECIFIER")\n",
pps->data_size, sizeof(pps->data));
pps->data_size = sizeof(pps->data);
}
memcpy(pps->data, gb->buffer, pps->data_size);
// Re-add the removed stop bit (may be used by hwaccels).
if (!(bit_length & 7) && pps->data_size < sizeof(pps->data))
pps->data[pps->data_size++] = 0x80;
pps->sps_id = get_ue_golomb_31(gb);
if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
!ps->sps_list[pps->sps_id]) {
av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
ret = AVERROR_INVALIDDATA;
goto fail;
}
pps->sps_ref = av_buffer_ref(ps->sps_list[pps->sps_id]);
if (!pps->sps_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
pps->sps = (const SPS*)pps->sps_ref->data;
sps = pps->sps;
if (sps->bit_depth_luma > 14) {
av_log(avctx, AV_LOG_ERROR,
"Invalid luma bit depth=%d\n",
sps->bit_depth_luma);
ret = AVERROR_INVALIDDATA;
goto fail;
} else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
avpriv_report_missing_feature(avctx,
"Unimplemented luma bit depth=%d",
sps->bit_depth_luma);
ret = AVERROR_PATCHWELCOME;
goto fail;
}
pps->cabac = get_bits1(gb);
pps->pic_order_present = get_bits1(gb);
pps->slice_group_count = get_ue_golomb(gb) + 1;
if (pps->slice_group_count > 1) {
pps->mb_slice_group_map_type = get_ue_golomb(gb);
avpriv_report_missing_feature(avctx, "FMO");
ret = AVERROR_PATCHWELCOME;
goto fail;
}
pps->ref_count[0] = get_ue_golomb(gb) + 1;
pps->ref_count[1] = get_ue_golomb(gb) + 1;
if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
av_log(avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
pps->weighted_pred = get_bits1(gb);
pps->weighted_bipred_idc = get_bits(gb, 2);
pps->init_qp = get_se_golomb(gb) + 26U + qp_bd_offset;
pps->init_qs = get_se_golomb(gb) + 26U + qp_bd_offset;
pps->chroma_qp_index_offset[0] = get_se_golomb(gb);
if (pps->chroma_qp_index_offset[0] < -12 || pps->chroma_qp_index_offset[0] > 12) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
pps->deblocking_filter_parameters_present = get_bits1(gb);
pps->constrained_intra_pred = get_bits1(gb);
pps->redundant_pic_cnt_present = get_bits1(gb);
pps->transform_8x8_mode = 0;
memcpy(pps->scaling_matrix4, sps->scaling_matrix4,
sizeof(pps->scaling_matrix4));
memcpy(pps->scaling_matrix8, sps->scaling_matrix8,
sizeof(pps->scaling_matrix8));
bits_left = bit_length - get_bits_count(gb);
if (bits_left > 0 && more_rbsp_data_in_pps(sps, avctx)) {
pps->transform_8x8_mode = get_bits1(gb);
ret = decode_scaling_matrices(gb, sps, pps, 0,
pps->scaling_matrix4, pps->scaling_matrix8);
if (ret < 0)
goto fail;
// second_chroma_qp_index_offset
pps->chroma_qp_index_offset[1] = get_se_golomb(gb);
if (pps->chroma_qp_index_offset[1] < -12 || pps->chroma_qp_index_offset[1] > 12) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
} else {
pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
}
build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
sps->bit_depth_luma);
build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
sps->bit_depth_luma);
init_dequant_tables(pps, sps);
if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
pps->chroma_qp_diff = 1;
if (avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(avctx, AV_LOG_DEBUG,
"pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",
pps_id, pps->sps_id,
pps->cabac ? "CABAC" : "CAVLC",
pps->slice_group_count,
pps->ref_count[0], pps->ref_count[1],
pps->weighted_pred ? "weighted" : "",
pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
pps->deblocking_filter_parameters_present ? "LPAR" : "",
pps->constrained_intra_pred ? "CONSTR" : "",
pps->redundant_pic_cnt_present ? "REDU" : "",
pps->transform_8x8_mode ? "8x8DCT" : "");
}
remove_pps(ps, pps_id);
ps->pps_list[pps_id] = pps_buf;
return 0;
fail:
av_buffer_unref(&pps_buf);
return ret;
}
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