virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-26 19:01:44 +02:00
Code Issues Releases Activity
3d71b1f8f0
FFmpeg/libavcodec/h264_ps.c
Anton Khirnov 84f226a3bc h264: use the correct SPS during PPS parsing 
There is in general no reason for the currently active SPS to be the one
referenced by the PPS being parsed.
2015-04-05 12:01:34 +02:00

683 lines
27 KiB
C
Raw Blame History

/*
* 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 "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[3][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) },
};
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 */
}
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 (%"PRIu32"/%"PRIu32")\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);
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,
"Clipping illegal num_reorder_frames %d\n",
sps->num_reorder_frames);
sps->num_reorder_frames = 16;
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
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[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
}
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[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
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
skip_bits(&h->gb, 2); // reserved_zero_2bits
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 %u out of range\n", sps_id);
return AVERROR_INVALIDDATA;
}
sps = av_mallocz(sizeof(SPS));
if (!sps)
return AVERROR(ENOMEM);
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(&h->gb);
if (sps->chroma_format_idc > 3) {
avpriv_request_sample(h->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(&h->gb);
}
sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
if (sps->bit_depth_chroma != sps->bit_depth_luma) {
avpriv_request_sample(h->avctx,
"Different chroma and luma bit depth");
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
sps->log2_max_poc_lsb = get_ue_golomb(&h->gb) + 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 %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(&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 (sps->ref_frame_count > H264_MAX_PICTURE_COUNT - 2 ||
sps->ref_frame_count >= 32U) {
av_log(h->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(&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);
if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {
av_log(h->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(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) {
unsigned int crop_left = get_ue_golomb(&h->gb);
unsigned int crop_right = get_ue_golomb(&h->gb);
unsigned int crop_top = get_ue_golomb(&h->gb);
unsigned int crop_bottom = get_ue_golomb(&h->gb);
if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
av_log(h->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)) &&
!(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 (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(h->avctx, AV_LOG_WARNING, "Invalid crop parameters\n");
if (h->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(&h->gb);
if (sps->vui_parameters_present_flag) {
int ret = decode_vui_parameters(h, sps);
if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
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:%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);
}
sps->new = 1;
av_free(h->sps_buffers[sps_id]);
h->sps_buffers[sps_id] = sps;
h->sps = *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)];
}
int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
{
const SPS *sps;
unsigned int pps_id = get_ue_golomb(&h->gb);
PPS *pps;
int qp_bd_offset;
int bits_left;
if (pps_id >= MAX_PPS_COUNT) {
av_log(h->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->sps_id = get_ue_golomb_31(&h->gb);
if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
!h->sps_buffers[pps->sps_id]) {
av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
goto fail;
}
sps = h->sps_buffers[pps->sps_id];
if (sps->bit_depth_luma > 10) {
av_log(h->avctx, AV_LOG_ERROR,
"Unimplemented luma bit depth=%d (max=10)\n",
sps->bit_depth_luma);
return AVERROR_PATCHWELCOME;
}
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;
}
qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
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 && (bits_left > 8 ||
show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {
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:%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" : "");
}
av_free(h->pps_buffers[pps_id]);
h->pps_buffers[pps_id] = pps;
return 0;
fail:
av_free(pps);
return -1;
}
Reference in New Issue View Git Blame Copy Permalink