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FFmpeg/libavcodec/h264_ps.c
Michael Niedermayer ac3fa95e73 Merge commit '94603feb1b3ad01a821a1a1cef1570b13f471821' 
* commit '94603feb1b3ad01a821a1a1cef1570b13f471821':
  h264_ps: when parsing a VUI fails, only abort when explode is set

Merge only for metadata, ignoring invalid data can put the context
into an invalid state and can possibly be used for remote code
execution exploits.
Also we support all non standard VUIs that have been reported so
ignoring parsing failure makes no sense for us unless theres
some issue that has not been reported

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-10-28 11:08:58 +01:00

725 lines
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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 / MPEG4 part10 parameter set decoding.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "libavutil/imgutils.h"
#include "internal.h"
#include "avcodec.h"
#include "h264.h"
#include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
#include "golomb.h"
#define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
#define MIN_LOG2_MAX_FRAME_NUM 4
static const AVRational pixel_aspect[17] = {
{ 0, 1 },
{ 1, 1 },
{ 12, 11 },
{ 10, 11 },
{ 16, 11 },
{ 40, 33 },
{ 24, 11 },
{ 20, 11 },
{ 32, 11 },
{ 80, 33 },
{ 18, 11 },
{ 15, 11 },
{ 64, 33 },
{ 160, 99 },
{ 4, 3 },
{ 3, 2 },
{ 2, 1 },
};
#define QP(qP, depth) ((qP) + 6 * ((depth) - 8))
#define CHROMA_QP_TABLE_END(d) \
QP(0, d), QP(1, d), QP(2, d), QP(3, d), QP(4, d), QP(5, d), \
QP(6, d), QP(7, d), QP(8, d), QP(9, d), QP(10, d), QP(11, d), \
QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d), \
QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d), \
QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d), \
QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d), \
QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d), \
QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d), \
QP(39, d), QP(39, d), QP(39, d), QP(39, d)
const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1] = {
{ CHROMA_QP_TABLE_END(8) },
{ 0, 1, 2, 3, 4, 5,
CHROMA_QP_TABLE_END(9) },
{ 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
CHROMA_QP_TABLE_END(10) },
{ 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
12,13,14,15, 16, 17,
CHROMA_QP_TABLE_END(11) },
{ 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
12,13,14,15, 16, 17,
18,19,20,21, 22, 23,
CHROMA_QP_TABLE_END(12) },
{ 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
12,13,14,15, 16, 17,
18,19,20,21, 22, 23,
24,25,26,27, 28, 29,
CHROMA_QP_TABLE_END(13) },
{ 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11,
12,13,14,15, 16, 17,
18,19,20,21, 22, 23,
24,25,26,27, 28, 29,
30,31,32,33, 34, 35,
CHROMA_QP_TABLE_END(14) },
};
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 }
};
static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
{
int cpb_count, i;
cpb_count = get_ue_golomb_31(&h->gb) + 1;
if (cpb_count > 32U) {
av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
return AVERROR_INVALIDDATA;
}
get_bits(&h->gb, 4); /* bit_rate_scale */
get_bits(&h->gb, 4); /* cpb_size_scale */
for (i = 0; i < cpb_count; i++) {
get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
get_bits1(&h->gb); /* cbr_flag */
}
sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
sps->time_offset_length = get_bits(&h->gb, 5);
sps->cpb_cnt = cpb_count;
return 0;
}
static inline int decode_vui_parameters(H264Context *h, SPS *sps)
{
int aspect_ratio_info_present_flag;
unsigned int aspect_ratio_idc;
aspect_ratio_info_present_flag = get_bits1(&h->gb);
if (aspect_ratio_info_present_flag) {
aspect_ratio_idc = get_bits(&h->gb, 8);
if (aspect_ratio_idc == EXTENDED_SAR) {
sps->sar.num = get_bits(&h->gb, 16);
sps->sar.den = get_bits(&h->gb, 16);
} else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
sps->sar = pixel_aspect[aspect_ratio_idc];
} else {
av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
return AVERROR_INVALIDDATA;
}
} else {
sps->sar.num =
sps->sar.den = 0;
}
if (get_bits1(&h->gb)) /* overscan_info_present_flag */
get_bits1(&h->gb); /* overscan_appropriate_flag */
sps->video_signal_type_present_flag = get_bits1(&h->gb);
if (sps->video_signal_type_present_flag) {
get_bits(&h->gb, 3); /* video_format */
sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
sps->colour_description_present_flag = get_bits1(&h->gb);
if (sps->colour_description_present_flag) {
sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
sps->color_trc = get_bits(&h->gb, 8); /* transfer_characteristics */
sps->colorspace = get_bits(&h->gb, 8); /* matrix_coefficients */
if (sps->color_primaries >= AVCOL_PRI_NB)
sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
if (sps->color_trc >= AVCOL_TRC_NB)
sps->color_trc = AVCOL_TRC_UNSPECIFIED;
if (sps->colorspace >= AVCOL_SPC_NB)
sps->colorspace = AVCOL_SPC_UNSPECIFIED;
}
}
/* chroma_location_info_present_flag */
if (get_bits1(&h->gb)) {
/* chroma_sample_location_type_top_field */
h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;
get_ue_golomb(&h->gb); /* chroma_sample_location_type_bottom_field */
}
if (show_bits1(&h->gb) && get_bits_left(&h->gb) < 10) {
av_log(h->avctx, AV_LOG_WARNING, "Truncated VUI\n");
return 0;
}
sps->timing_info_present_flag = get_bits1(&h->gb);
if (sps->timing_info_present_flag) {
sps->num_units_in_tick = get_bits_long(&h->gb, 32);
sps->time_scale = get_bits_long(&h->gb, 32);
if (!sps->num_units_in_tick || !sps->time_scale) {
av_log(h->avctx, AV_LOG_ERROR,
"time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n",
sps->time_scale, sps->num_units_in_tick);
return AVERROR_INVALIDDATA;
}
sps->fixed_frame_rate_flag = get_bits1(&h->gb);
}
sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
if (sps->nal_hrd_parameters_present_flag)
if (decode_hrd_parameters(h, sps) < 0)
return AVERROR_INVALIDDATA;
sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
if (sps->vcl_hrd_parameters_present_flag)
if (decode_hrd_parameters(h, sps) < 0)
return AVERROR_INVALIDDATA;
if (sps->nal_hrd_parameters_present_flag ||
sps->vcl_hrd_parameters_present_flag)
get_bits1(&h->gb); /* low_delay_hrd_flag */
sps->pic_struct_present_flag = get_bits1(&h->gb);
if (!get_bits_left(&h->gb))
return 0;
sps->bitstream_restriction_flag = get_bits1(&h->gb);
if (sps->bitstream_restriction_flag) {
get_bits1(&h->gb); /* motion_vectors_over_pic_boundaries_flag */
get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
sps->num_reorder_frames = get_ue_golomb(&h->gb);
get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
if (get_bits_left(&h->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(h->avctx, AV_LOG_ERROR,
"illegal num_reorder_frames %d\n", sps->num_reorder_frames);
return AVERROR_INVALIDDATA;
}
}
if (get_bits_left(&h->gb) < 0) {
av_log(h->avctx, AV_LOG_ERROR,
"Overread VUI by %d bits\n", -get_bits_left(&h->gb));
return AVERROR_INVALIDDATA;
}
return 0;
}
static void decode_scaling_list(H264Context *h, 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 ? zigzag_scan : ff_zigzag_direct;
if (!get_bits1(&h->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)
next = (last + get_se_golomb(&h->gb)) & 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;
}
}
static void decode_scaling_matrices(H264Context *h, SPS *sps,
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]
};
if (get_bits1(&h->gb)) {
sps->scaling_matrix_present |= is_sps;
decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
if (is_sps || pps->transform_8x8_mode) {
decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
if (sps->chroma_format_idc == 3) {
decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
}
}
}
}
int ff_h264_decode_seq_parameter_set(H264Context *h)
{
int profile_idc, level_idc, constraint_set_flags = 0;
unsigned int sps_id;
int i, log2_max_frame_num_minus4;
SPS *sps;
profile_idc = get_bits(&h->gb, 8);
constraint_set_flags |= get_bits1(&h->gb) << 0; // constraint_set0_flag
constraint_set_flags |= get_bits1(&h->gb) << 1; // constraint_set1_flag
constraint_set_flags |= get_bits1(&h->gb) << 2; // constraint_set2_flag
constraint_set_flags |= get_bits1(&h->gb) << 3; // constraint_set3_flag
constraint_set_flags |= get_bits1(&h->gb) << 4; // constraint_set4_flag
constraint_set_flags |= get_bits1(&h->gb) << 5; // constraint_set5_flag
get_bits(&h->gb, 2); // reserved
level_idc = get_bits(&h->gb, 8);
sps_id = get_ue_golomb_31(&h->gb);
if (sps_id >= MAX_SPS_COUNT) {
av_log(h->avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
return AVERROR_INVALIDDATA;
}
sps = av_mallocz(sizeof(SPS));
if (!sps)
return AVERROR(ENOMEM);
sps->time_offset_length = 24;
sps->profile_idc = profile_idc;
sps->constraint_set_flags = constraint_set_flags;
sps->level_idc = level_idc;
sps->full_range = -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->colorspace = 2; //AVCOL_SPC_UNSPECIFIED
if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 244 ||
sps->profile_idc == 44 || sps->profile_idc == 83 ||
sps->profile_idc == 86 || sps->profile_idc == 118 ||
sps->profile_idc == 128 || sps->profile_idc == 144) {
sps->chroma_format_idc = get_ue_golomb_31(&h->gb);
if (sps->chroma_format_idc > 3U) {
av_log(h->avctx, AV_LOG_ERROR,
"chroma_format_idc %d is illegal\n",
sps->chroma_format_idc);
goto fail;
} else if (sps->chroma_format_idc == 3) {
sps->residual_color_transform_flag = get_bits1(&h->gb);
if (sps->residual_color_transform_flag) {
av_log(h->avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
goto fail;
}
}
sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
if (sps->bit_depth_luma > 14U || sps->bit_depth_chroma > 14U || sps->bit_depth_luma != sps->bit_depth_chroma) {
av_log(h->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(&h->gb);
decode_scaling_matrices(h, sps, NULL, 1,
sps->scaling_matrix4, sps->scaling_matrix8);
} else {
sps->chroma_format_idc = 1;
sps->bit_depth_luma = 8;
sps->bit_depth_chroma = 8;
}
log2_max_frame_num_minus4 = get_ue_golomb(&h->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(h->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(&h->gb);
if (sps->poc_type == 0) { // FIXME #define
unsigned t = get_ue_golomb(&h->gb);
if (t>12) {
av_log(h->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(&h->gb);
sps->offset_for_non_ref_pic = get_se_golomb(&h->gb);
sps->offset_for_top_to_bottom_field = get_se_golomb(&h->gb);
sps->poc_cycle_length = get_ue_golomb(&h->gb);
if ((unsigned)sps->poc_cycle_length >=
FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
av_log(h->avctx, AV_LOG_ERROR,
"poc_cycle_length overflow %u\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(&h->gb);
} else if (sps->poc_type != 2) {
av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
goto fail;
}
sps->ref_frame_count = get_ue_golomb_31(&h->gb);
if (h->avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
if (sps->ref_frame_count > MAX_PICTURE_COUNT - 2 ||
sps->ref_frame_count > 16U) {
av_log(h->avctx, AV_LOG_ERROR, "too many reference frames\n");
goto fail;
}
sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);
sps->mb_width = get_ue_golomb(&h->gb) + 1;
sps->mb_height = get_ue_golomb(&h->gb) + 1;
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, h->avctx)) {
av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
goto fail;
}
sps->frame_mbs_only_flag = get_bits1(&h->gb);
if (!sps->frame_mbs_only_flag)
sps->mb_aff = get_bits1(&h->gb);
else
sps->mb_aff = 0;
sps->direct_8x8_inference_flag = get_bits1(&h->gb);
#ifndef ALLOW_INTERLACE
if (sps->mb_aff)
av_log(h->avctx, AV_LOG_ERROR,
"MBAFF support not included; enable it at compile-time.\n");
#endif
sps->crop = get_bits1(&h->gb);
if (sps->crop) {
int crop_left = get_ue_golomb(&h->gb);
int crop_right = get_ue_golomb(&h->gb);
int crop_top = get_ue_golomb(&h->gb);
int crop_bottom = get_ue_golomb(&h->gb);
int width = 16 * sps->mb_width;
int height = 16 * sps->mb_height * (2 - sps->frame_mbs_only_flag);
if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
"values are l:%u r:%u t:%u b:%u\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 & (0x1F >> (sps->bit_depth_luma > 8)) &&
!(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
av_log(h->avctx, AV_LOG_WARNING,
"Reducing left cropping to %d "
"chroma samples to preserve alignment.\n",
crop_left);
}
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(h->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(&h->gb);
if (sps->vui_parameters_present_flag) {
int ret = decode_vui_parameters(h, sps);
if (ret < 0)
goto fail;
}
if (!sps->sar.den)
sps->sar.den = 1;
if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
static const char csp[4][5] = { "Gray", "420", "422", "444" };
av_log(h->avctx, AV_LOG_DEBUG,
"sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d 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,
h->sps.bitstream_restriction_flag ? sps->num_reorder_frames : -1
);
}
sps->new = 1;
av_free(h->sps_buffers[sps_id]);
h->sps_buffers[sps_id] = sps;
return 0;
fail:
av_free(sps);
return -1;
}
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(H264Context *h, PPS *pps)
{
const SPS *sps = h->sps_buffers[pps->sps_id];
int profile_idc = sps->profile_idc;
if ((profile_idc == 66 || profile_idc == 77 ||
profile_idc == 88) && (sps->constraint_set_flags & 7)) {
av_log(h->avctx, AV_LOG_VERBOSE,
"Current profile doesn't provide more RBSP data in PPS, skipping\n");
return 0;
}
return 1;
}
int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
{
unsigned int pps_id = get_ue_golomb(&h->gb);
PPS *pps;
SPS *sps;
int qp_bd_offset;
int bits_left;
if (pps_id >= MAX_PPS_COUNT) {
av_log(h->avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
return AVERROR_INVALIDDATA;
}
pps = av_mallocz(sizeof(PPS));
if (!pps)
return AVERROR(ENOMEM);
pps->sps_id = get_ue_golomb_31(&h->gb);
if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
h->sps_buffers[pps->sps_id] == NULL) {
av_log(h->avctx, AV_LOG_ERROR, "sps_id out of range\n");
goto fail;
}
sps = h->sps_buffers[pps->sps_id];
qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
if (sps->bit_depth_luma > 14) {
av_log(h->avctx, AV_LOG_ERROR,
"Invalid luma bit depth=%d\n",
sps->bit_depth_luma);
goto fail;
} else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
av_log(h->avctx, AV_LOG_ERROR,
"Unimplemented luma bit depth=%d\n",
sps->bit_depth_luma);
goto fail;
}
pps->cabac = get_bits1(&h->gb);
pps->pic_order_present = get_bits1(&h->gb);
pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
if (pps->slice_group_count > 1) {
pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);
av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
switch (pps->mb_slice_group_map_type) {
case 0:
#if 0
| for (i = 0; i <= num_slice_groups_minus1; i++) | | |
| run_length[i] |1 |ue(v) |
#endif
break;
case 2:
#if 0
| for (i = 0; i < num_slice_groups_minus1; i++) { | | |
| top_left_mb[i] |1 |ue(v) |
| bottom_right_mb[i] |1 |ue(v) |
| } | | |
#endif
break;
case 3:
case 4:
case 5:
#if 0
| slice_group_change_direction_flag |1 |u(1) |
| slice_group_change_rate_minus1 |1 |ue(v) |
#endif
break;
case 6:
#if 0
| slice_group_id_cnt_minus1 |1 |ue(v) |
| for (i = 0; i <= slice_group_id_cnt_minus1; i++)| | |
| slice_group_id[i] |1 |u(v) |
#endif
break;
}
}
pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
goto fail;
}
pps->weighted_pred = get_bits1(&h->gb);
pps->weighted_bipred_idc = get_bits(&h->gb, 2);
pps->init_qp = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
pps->init_qs = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
pps->chroma_qp_index_offset[0] = get_se_golomb(&h->gb);
pps->deblocking_filter_parameters_present = get_bits1(&h->gb);
pps->constrained_intra_pred = get_bits1(&h->gb);
pps->redundant_pic_cnt_present = get_bits1(&h->gb);
pps->transform_8x8_mode = 0;
// contents of sps/pps can change even if id doesn't, so reinit
h->dequant_coeff_pps = -1;
memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
sizeof(pps->scaling_matrix4));
memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
sizeof(pps->scaling_matrix8));
bits_left = bit_length - get_bits_count(&h->gb);
if (bits_left > 0 && more_rbsp_data_in_pps(h, pps)) {
pps->transform_8x8_mode = get_bits1(&h->gb);
decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
pps->scaling_matrix4, pps->scaling_matrix8);
// second_chroma_qp_index_offset
pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
} 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);
if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
pps->chroma_qp_diff = 1;
if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(h->avctx, AV_LOG_DEBUG,
"pps:%u sps:%u %s slice_groups:%d ref:%d/%d %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" : "");
}
av_free(h->pps_buffers[pps_id]);
h->pps_buffers[pps_id] = pps;
return 0;
fail:
av_free(pps);
return -1;
}
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