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ffmpeg/libavcodec/h264_ps.c
Anton Khirnov 3176217c60 h264: decouple h264_ps from the h264 decoder 
Make the SPS/PPS parsing independent of the H264Context, to allow
decoupling the parser from the decoder. The change is modelled after the
one done earlier for HEVC.

Move the dequant buffers to the PPS to avoid complex checks whether they
changed and an expensive copy for frame threads.
2016-04-24 10:06:23 +02:00

809 lines
30 KiB
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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 Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 <inttypes.h>
#include "libavutil/imgutils.h"
#include "internal.h"
#include "mathops.h"
#include "avcodec.h"
#include "h264.h"
#include "h264data.h"
#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 },
};
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)
{
if (s->pps_list[id] && s->pps == (const PPS*)s->pps_list[id]->data)
s->pps = NULL;
av_buffer_unref(&s->pps_list[id]);
}
static void remove_sps(H264ParamSets *s, int id)
{
int i;
if (s->sps_list[id]) {
if (s->sps == (SPS*)s->sps_list[id]->data)
s->sps = NULL;
/* 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);
}
av_buffer_unref(&s->sps_list[id]);
}
static inline int decode_hrd_parameters(GetBitContext *gb, AVCodecContext *avctx,
SPS *sps)
{
int cpb_count, i;
cpb_count = get_ue_golomb_31(gb) + 1;
if (cpb_count > 32U) {
av_log(avctx, 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, AVCodecContext *avctx,
SPS *sps)
{
int aspect_ratio_info_present_flag;
unsigned int aspect_ratio_idc;
aspect_ratio_info_present_flag = get_bits1(gb);
if (aspect_ratio_info_present_flag) {
aspect_ratio_idc = get_bits(gb, 8);
if (aspect_ratio_idc == EXTENDED_SAR) {
sps->sar.num = get_bits(gb, 16);
sps->sar.den = get_bits(gb, 16);
} else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
sps->sar = pixel_aspect[aspect_ratio_idc];
} else {
av_log(avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
return AVERROR_INVALIDDATA;
}
} else {
sps->sar.num =
sps->sar.den = 0;
}
if (get_bits1(gb)) /* overscan_info_present_flag */
get_bits1(gb); /* overscan_appropriate_flag */
sps->video_signal_type_present_flag = get_bits1(gb);
if (sps->video_signal_type_present_flag) {
get_bits(gb, 3); /* video_format */
sps->full_range = get_bits1(gb); /* video_full_range_flag */
sps->colour_description_present_flag = get_bits1(gb);
if (sps->colour_description_present_flag) {
sps->color_primaries = get_bits(gb, 8); /* colour_primaries */
sps->color_trc = get_bits(gb, 8); /* transfer_characteristics */
sps->colorspace = get_bits(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(gb)) {
/* chroma_sample_location_type_top_field */
avctx->chroma_sample_location = get_ue_golomb(gb) + 1;
get_ue_golomb(gb); /* chroma_sample_location_type_bottom_field */
}
sps->timing_info_present_flag = get_bits1(gb);
if (sps->timing_info_present_flag) {
sps->num_units_in_tick = get_bits_long(gb, 32);
sps->time_scale = get_bits_long(gb, 32);
if (!sps->num_units_in_tick || !sps->time_scale) {
av_log(avctx, AV_LOG_ERROR,
"time_scale/num_units_in_tick invalid or unsupported (%"PRIu32"/%"PRIu32")\n",
sps->time_scale, sps->num_units_in_tick);
return AVERROR_INVALIDDATA;
}
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, avctx, 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, avctx, 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);
sps->bitstream_restriction_flag = get_bits1(gb);
if (sps->bitstream_restriction_flag) {
get_bits1(gb); /* motion_vectors_over_pic_boundaries_flag */
get_ue_golomb(gb); /* max_bytes_per_pic_denom */
get_ue_golomb(gb); /* max_bits_per_mb_denom */
get_ue_golomb(gb); /* log2_max_mv_length_horizontal */
get_ue_golomb(gb); /* log2_max_mv_length_vertical */
sps->num_reorder_frames = get_ue_golomb(gb);
get_ue_golomb(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(avctx, AV_LOG_ERROR,
"Clipping illegal num_reorder_frames %d\n",
sps->num_reorder_frames);
sps->num_reorder_frames = 16;
return AVERROR_INVALIDDATA;
}
}
if (get_bits_left(gb) < 0) {
av_log(avctx, AV_LOG_ERROR,
"Overread VUI by %d bits\n", -get_bits_left(gb));
return AVERROR_INVALIDDATA;
}
return 0;
}
static void 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)
next = (last + get_se_golomb(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(GetBitContext *gb, 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(gb)) {
sps->scaling_matrix_present |= is_sps;
decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
if (is_sps || pps->transform_8x8_mode) {
decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
if (sps->chroma_format_idc == 3) {
decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
}
decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
if (sps->chroma_format_idc == 3) {
decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
}
}
}
}
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
H264ParamSets *ps)
{
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;
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);
return AVERROR_INVALIDDATA;
}
sps_buf = av_buffer_allocz(sizeof(*sps));
if (!sps_buf)
return AVERROR(ENOMEM);
sps = (SPS*)sps_buf->data;
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;
memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
sps->scaling_matrix_present = 0;
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 > 3) {
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);
}
sps->bit_depth_luma = get_ue_golomb(gb) + 8;
sps->bit_depth_chroma = get_ue_golomb(gb) + 8;
if (sps->bit_depth_chroma != sps->bit_depth_luma) {
avpriv_request_sample(avctx,
"Different chroma and luma bit depth");
goto fail;
}
sps->transform_bypass = get_bits1(gb);
decode_scaling_matrices(gb, 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(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
sps->log2_max_poc_lsb = get_ue_golomb(gb) + 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(gb);
sps->offset_for_top_to_bottom_field = get_se_golomb(gb);
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(gb);
} 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 (sps->ref_frame_count > H264_MAX_PICTURE_COUNT - 2 ||
sps->ref_frame_count >= 32U) {
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;
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->frame_mbs_only_flag = get_bits1(gb);
if (!sps->frame_mbs_only_flag)
sps->mb_aff = get_bits1(gb);
else
sps->mb_aff = 0;
sps->direct_8x8_inference_flag = get_bits1(gb);
if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {
av_log(avctx, AV_LOG_ERROR,
"This stream was generated by a broken encoder, invalid 8x8 inference\n");
goto fail;
}
#ifndef ALLOW_INTERLACE
if (sps->mb_aff)
av_log(avctx, AV_LOG_ERROR,
"MBAFF support not included; enable it at compile-time.\n");
#endif
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);
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 & (0x1F >> (sps->bit_depth_luma > 8)) &&
!(avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {
crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
av_log(avctx, AV_LOG_WARNING,
"Reducing left cropping to %d "
"chroma samples to preserve alignment.\n",
crop_left);
}
if (INT_MAX / step_x <= crop_left ||
INT_MAX / step_x - crop_left <= crop_right ||
16 * sps->mb_width <= step_x * (crop_left + crop_right) ||
INT_MAX / step_y <= crop_top ||
INT_MAX / step_y - crop_top <= crop_bottom ||
16 * sps->mb_height <= step_y * (crop_top + crop_bottom)) {
av_log(avctx, AV_LOG_WARNING, "Invalid crop parameters\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
goto fail;
crop_left = crop_right = crop_top = crop_bottom = 0;
}
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 && avctx->err_recognition & AV_EF_EXPLODE)
goto fail;
}
/* if the maximum delay is not stored in the SPS, derive it based on the
* level */
if (!sps->bitstream_restriction_flag) {
sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 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->sar.den)
sps->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"\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);
}
/* 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);
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)];
}
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
H264ParamSets *ps, int bit_length)
{
AVBufferRef *pps_buf;
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_buf = av_buffer_allocz(sizeof(*pps));
if (!pps_buf)
return AVERROR(ENOMEM);
pps = (PPS*)pps_buf->data;
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;
}
sps = (SPS*)ps->sps_list[pps->sps_id]->data;
if (sps->bit_depth_luma > 10) {
av_log(avctx, AV_LOG_ERROR,
"Unimplemented luma bit depth=%d (max=10)\n",
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);
av_log(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(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) + 26 + qp_bd_offset;
pps->init_qs = get_se_golomb(gb) + 26 + qp_bd_offset;
pps->chroma_qp_index_offset[0] = get_se_golomb(gb);
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 && (bits_left > 8 ||
show_bits(gb, bits_left) != 1 << (bits_left - 1))) {
pps->transform_8x8_mode = get_bits1(gb);
decode_scaling_matrices(gb, sps, pps, 0,
pps->scaling_matrix4, pps->scaling_matrix8);
// second_chroma_qp_index_offset
pps->chroma_qp_index_offset[1] = get_se_golomb(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);
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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