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sps_pps.c
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sps_pps.c
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/***************************************************************************************
***************************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h> /* for uint32_t, etc */
#include "sps_pps.h"
/* report level */
#define RPT_ERR (1) // error, system error
#define RPT_WRN (2) // warning, maybe wrong, maybe OK
#define RPT_INF (3) // important information
#define RPT_DBG (4) // debug information
static int rpt_lvl = RPT_WRN; /* report level: ERR, WRN, INF, DBG */
/* report micro */
#define RPT(lvl, ...) \
do { \
if(lvl <= rpt_lvl) { \
switch(lvl) { \
case RPT_ERR: \
fprintf(stderr, "\"%s\" line %d [err]: ", __FILE__, __LINE__); \
break; \
case RPT_WRN: \
fprintf(stderr, "\"%s\" line %d [wrn]: ", __FILE__, __LINE__); \
break; \
case RPT_INF: \
fprintf(stderr, "\"%s\" line %d [inf]: ", __FILE__, __LINE__); \
break; \
case RPT_DBG: \
fprintf(stderr, "\"%s\" line %d [dbg]: ", __FILE__, __LINE__); \
break; \
default: \
fprintf(stderr, "\"%s\" line %d [???]: ", __FILE__, __LINE__); \
break; \
} \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
} \
} while(0)
/********************************************
*define here
********************************************/
#define SPS_PPS_DEBUG
#undef SPS_PPS_DEBUG
#define MAX_LEN 32
/********************************************
*functions
********************************************/
/**
* @brief Function get_1bit() 读1个bit
* @param[in] h get_bit_context structrue
* @retval 0: success, -1 : failure
* @pre
* @post
*/
static int get_1bit(void *h)
{
get_bit_context *ptr = (get_bit_context *)h;
int ret = 0;
uint8_t *cur_char = NULL;
uint8_t shift;
if(NULL == ptr)
{
RPT(RPT_ERR, "NULL pointer");
ret = -1;
goto exit;
}
cur_char = ptr->buf + (ptr->bit_pos >> 3);
shift = 7 - (ptr->cur_bit_pos);
ptr->bit_pos++;
ptr->cur_bit_pos = ptr->bit_pos & 0x7;
ret = ((*cur_char) >> shift) & 0x01;
exit:
return ret;
}
/**
* @brief Function get_bits() 读n个bits，n不能超过32
* @param[in] h get_bit_context structrue
* @param[in] n how many bits you want?
* @retval 0: success, -1 : failure
* @pre
* @post
*/
static int get_bits(void *h, int n)
{
get_bit_context *ptr = (get_bit_context *)h;
uint8_t temp[5] = {0};
uint8_t *cur_char = NULL;
uint8_t nbyte;
uint8_t shift;
uint32_t result=0;
uint64_t ret = 0;
if(NULL == ptr)
{
RPT(RPT_ERR, "NULL pointer");
ret = -1;
goto exit;
}
if(n > MAX_LEN)
{
n = MAX_LEN;
}
if((ptr->bit_pos + n) > ptr->total_bit)
{
n = ptr->total_bit- ptr->bit_pos;
}
cur_char = ptr->buf+ (ptr->bit_pos>>3);
nbyte = (ptr->cur_bit_pos + n + 7) >> 3;
shift = (8 - (ptr->cur_bit_pos + n))& 0x07;
if(n == MAX_LEN)
{
RPT(RPT_DBG, "12(ptr->bit_pos(:%d) + n(:%d)) > ptr->total_bit(:%d)!!! ",\
ptr->bit_pos, n, ptr->total_bit);
RPT(RPT_DBG, "0x%x 0x%x 0x%x 0x%x", (*cur_char), *(cur_char+1),*(cur_char+2),*(cur_char+3));
}
memcpy(&temp[5-nbyte], cur_char, nbyte);
ret = (uint32_t)temp[0] << 24;
ret = ret << 8;
ret = ((uint32_t)temp[1]<<24)|((uint32_t)temp[2] << 16)\
|((uint32_t)temp[3] << 8)|temp[4];
ret = (ret >> shift) & (((uint64_t)1<<n) - 1);
result = ret;
ptr->bit_pos += n;
ptr->cur_bit_pos = ptr->bit_pos & 0x7;
exit:
return result;
}
/**
* @brief Function parse_codenum() 指数哥伦布编码解析，参考h264标准第9节
* @param[in] buf
* @retval code_num
* @pre
* @post
*/
static int parse_codenum(void *buf)
{
uint8_t leading_zero_bits = -1;
uint8_t b;
uint32_t code_num = 0;
for(b=0; !b; leading_zero_bits++)
{
b = get_1bit(buf);
}
code_num = ((uint32_t)1 << leading_zero_bits) - 1 + get_bits(buf, leading_zero_bits);
return code_num;
}
/**
* @brief Function parse_ue() 指数哥伦布编码解析 ue(),参考h264标准第9节
* @param[in] buf sps_pps parse buf
* @retval code_num
* @pre
* @post
*/
static int parse_ue(void *buf)
{
return parse_codenum(buf);
}
/**
* @brief Function parse_se() 指数哥伦布编码解析 se(), 参考h264标准第9节
* @param[in] buf sps_pps parse buf
* @retval code_num
* @pre
* @post
*/
static int parse_se(void *buf)
{
int ret = 0;
int code_num;
code_num = parse_codenum(buf);
ret = (code_num + 1) >> 1;
ret = (code_num & 0x01)? ret : -ret;
return ret;
}
/**
* @brief Function get_bit_context_free() 申请的get_bit_context结构内存释放
* @param[in] buf get_bit_context buf
* @retval none
* @pre
* @post
*/
static void get_bit_context_free(void *buf)
{
get_bit_context *ptr = (get_bit_context *)buf;
if(ptr)
{
if(ptr->buf)
{
free(ptr->buf);
}
free(ptr);
}
}
/**
* @brief Function de_emulation_prevention() 解竞争代码
* @param[in] buf get_bit_context buf
* @retval none
* @pre
* @post
* @note:
* 调试时总是发现vui.time_scale值特别奇怪，总是16777216，后来查询原因如下:
* http://www.cnblogs.com/eustoma/archive/2012/02/13/2415764.html
* H.264编码时，在每个NAL前添加起始码 0x000001，解码器在码流中检测到起始码，当前NAL结束。
* 为了防止NAL内部出现0x000001的数据，h.264又提出'防止竞争 emulation prevention"机制，
* 在编码完一个NAL时，如果检测出有连续两个0x00字节，就在后面插入一个0x03。
* 当解码器在NAL内部检测到0x000003的数据，就把0x03抛弃，恢复原始数据。
* 0x000000 >>>>>> 0x00000300
* 0x000001 >>>>>> 0x00000301
* 0x000002 >>>>>> 0x00000302
* 0x000003 >>>>>> 0x00000303
*/
static void *de_emulation_prevention(void *buf)
{
get_bit_context *ptr = NULL;
get_bit_context *buf_ptr = (get_bit_context *)buf;
int i = 0, j = 0;
uint8_t *tmp_ptr = NULL;
int tmp_buf_size = 0;
int val = 0;
if(NULL == buf_ptr)
{
RPT(RPT_ERR, "NULL ptr");
goto exit;
}
ptr = (get_bit_context *)malloc(sizeof(get_bit_context));
if(NULL == ptr)
{
RPT(RPT_ERR, "NULL ptr");
goto exit;
}
memcpy(ptr, buf_ptr, sizeof(get_bit_context));
ptr->buf = (uint8_t *)malloc(ptr->buf_size);
if(NULL == ptr->buf)
{
RPT(RPT_ERR, "NULL ptr");
goto exit;
}
memcpy(ptr->buf, buf_ptr->buf, buf_ptr->buf_size);
tmp_ptr = ptr->buf;
tmp_buf_size = ptr->buf_size;
for(i=0; i<(tmp_buf_size-2); i++)
{
/*检测0x000003*/
val = (tmp_ptr[i]^0x00) + (tmp_ptr[i+1]^0x00) + (tmp_ptr[i+2]^0x03);
if(val == 0)
{
/*剔除0x03*/
for(j=i+2; j<tmp_buf_size-1; j++)
{
tmp_ptr[j] = tmp_ptr[j+1];
}
/*相应的bufsize要减小*/
ptr->buf_size--;
}
}
/*重新计算total_bit*/
ptr->total_bit = ptr->buf_size << 3;
return (void *)ptr;
exit:
get_bit_context_free(ptr);
return NULL;
}
/**
* @brief Function get_bit_context_free() VUI_parameters 解析，原理参考h264标准
* @param[in] buf get_bit_context buf
* @param[in] vui_ptr vui解析结果
* @retval 0: success, -1 : failure
* @pre
* @post
*/
static int vui_parameters_set(void *buf, vui_parameters_t *vui_ptr)
{
int ret = 0;
int SchedSelIdx = 0;
if(NULL == vui_ptr || NULL == buf)
{
RPT(RPT_ERR,"ERR null pointer\n");
ret = -1;
goto exit;
}
vui_ptr->aspect_ratio_info_present_flag = get_1bit(buf);
if(vui_ptr->aspect_ratio_info_present_flag)
{
vui_ptr->aspect_ratio_idc = get_bits(buf, 8);
if(vui_ptr->aspect_ratio_idc == Extended_SAR)
{
vui_ptr->sar_width = get_bits(buf, 16);
vui_ptr->sar_height = get_bits(buf, 16);
}
}
vui_ptr->overscan_info_present_flag = get_1bit(buf);
if(vui_ptr->overscan_info_present_flag)
{
vui_ptr->overscan_appropriate_flag = get_1bit(buf);
}
vui_ptr->video_signal_type_present_flag = get_1bit(buf);
if(vui_ptr->video_signal_type_present_flag)
{
vui_ptr->video_format = get_bits(buf, 3);
vui_ptr->video_full_range_flag = get_1bit(buf);
vui_ptr->colour_description_present_flag = get_1bit(buf);
if(vui_ptr->colour_description_present_flag)
{
vui_ptr->colour_primaries = get_bits(buf, 8);
vui_ptr->transfer_characteristics = get_bits(buf, 8);
vui_ptr->matrix_coefficients = get_bits(buf, 8);
}
}
vui_ptr->chroma_loc_info_present_flag = get_1bit(buf);
if(vui_ptr->chroma_loc_info_present_flag)
{
vui_ptr->chroma_sample_loc_type_top_field = parse_ue(buf);
vui_ptr->chroma_sample_loc_type_bottom_field = parse_ue(buf);
}
vui_ptr->timing_info_present_flag = get_1bit(buf);
if(vui_ptr->timing_info_present_flag)
{
vui_ptr->num_units_in_tick = get_bits(buf, 32);
vui_ptr->time_scale = get_bits(buf, 32);
vui_ptr->fixed_frame_rate_flag = get_1bit(buf);
}
vui_ptr->nal_hrd_parameters_present_flag = get_1bit(buf);
if(vui_ptr->nal_hrd_parameters_present_flag)
{
vui_ptr->cpb_cnt_minus1 = parse_ue(buf);
vui_ptr->bit_rate_scale = get_bits(buf, 4);
vui_ptr->cpb_size_scale = get_bits(buf, 4);
for(SchedSelIdx=0; SchedSelIdx<=vui_ptr->cpb_cnt_minus1; SchedSelIdx++)
{
vui_ptr->bit_rate_value_minus1[SchedSelIdx] = parse_ue(buf);
vui_ptr->cpb_size_value_minus1[SchedSelIdx] = parse_ue(buf);
vui_ptr->cbr_flag[SchedSelIdx] = get_1bit(buf);
}
vui_ptr->initial_cpb_removal_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->cpb_removal_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->dpb_output_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->time_offset_length = get_bits(buf, 5);
}
vui_ptr->vcl_hrd_parameters_present_flag = get_1bit(buf);
if(vui_ptr->vcl_hrd_parameters_present_flag)
{
vui_ptr->cpb_cnt_minus1 = parse_ue(buf);
vui_ptr->bit_rate_scale = get_bits(buf, 4);
vui_ptr->cpb_size_scale = get_bits(buf, 4);
for(SchedSelIdx=0; SchedSelIdx<=vui_ptr->cpb_cnt_minus1; SchedSelIdx++)
{
vui_ptr->bit_rate_value_minus1[SchedSelIdx] = parse_ue(buf);
vui_ptr->cpb_size_value_minus1[SchedSelIdx] = parse_ue(buf);
vui_ptr->cbr_flag[SchedSelIdx] = get_1bit(buf);
}
vui_ptr->initial_cpb_removal_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->cpb_removal_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->dpb_output_delay_length_minus1 = get_bits(buf, 5);
vui_ptr->time_offset_length = get_bits(buf, 5);
}
if(vui_ptr->nal_hrd_parameters_present_flag \
|| vui_ptr->vcl_hrd_parameters_present_flag)
{
vui_ptr->low_delay_hrd_flag = get_1bit(buf);
}
vui_ptr->pic_struct_present_flag = get_1bit(buf);
vui_ptr->bitstream_restriction_flag = get_1bit(buf);
if(vui_ptr->bitstream_restriction_flag)
{
vui_ptr->motion_vectors_over_pic_boundaries_flag = get_1bit(buf);
vui_ptr->max_bytes_per_pic_denom = parse_ue(buf);
vui_ptr->max_bits_per_mb_denom = parse_ue(buf);
vui_ptr->log2_max_mv_length_horizontal= parse_ue(buf);
vui_ptr->log2_max_mv_length_vertical = parse_ue(buf);
vui_ptr->num_reorder_frames = parse_ue(buf);
vui_ptr->max_dec_frame_buffering = parse_ue(buf);
}
exit:
return ret;
}
/**
* @brief Function sps_info_print() 调试信息打印
* @param[in] sps_ptr sps信息结构体指针
* @retval
* @pre
* @post
*/
#ifdef SPS_PPS_DEBUG
/*SPS 信息打印，调试使用*/
static void sps_info_print(SPS* sps_ptr)
{
if(NULL != sps_ptr)
{
RPT(RPT_DBG, "profile_idc: %d", sps_ptr->profile_idc);
RPT(RPT_DBG, "constraint_set0_flag: %d", sps_ptr->constraint_set0_flag);
RPT(RPT_DBG, "constraint_set1_flag: %d", sps_ptr->constraint_set1_flag);
RPT(RPT_DBG, "constraint_set2_flag: %d", sps_ptr->constraint_set2_flag);
RPT(RPT_DBG, "constraint_set3_flag: %d", sps_ptr->constraint_set3_flag);
RPT(RPT_DBG, "reserved_zero_4bits: %d", sps_ptr->reserved_zero_4bits);
RPT(RPT_DBG, "level_idc: %d", sps_ptr->level_idc);
RPT(RPT_DBG, "seq_parameter_set_id: %d", sps_ptr->seq_parameter_set_id);
RPT(RPT_DBG, "chroma_format_idc: %d", sps_ptr->chroma_format_idc);
RPT(RPT_DBG, "separate_colour_plane_flag: %d", sps_ptr->separate_colour_plane_flag);
RPT(RPT_DBG, "bit_depth_luma_minus8: %d", sps_ptr->bit_depth_luma_minus8);
RPT(RPT_DBG, "bit_depth_chroma_minus8: %d", sps_ptr->bit_depth_chroma_minus8);
RPT(RPT_DBG, "qpprime_y_zero_transform_bypass_flag: %d", sps_ptr->qpprime_y_zero_transform_bypass_flag);
RPT(RPT_DBG, "seq_scaling_matrix_present_flag: %d", sps_ptr->seq_scaling_matrix_present_flag);
//RPT(RPT_INF, "seq_scaling_list_present_flag:%d", sps_ptr->seq_scaling_list_present_flag);
RPT(RPT_DBG, "log2_max_frame_num_minus4: %d", sps_ptr->log2_max_frame_num_minus4);
RPT(RPT_DBG, "pic_order_cnt_type: %d", sps_ptr->pic_order_cnt_type);
RPT(RPT_DBG, "num_ref_frames: %d", sps_ptr->num_ref_frames);
RPT(RPT_DBG, "gaps_in_frame_num_value_allowed_flag: %d", sps_ptr->gaps_in_frame_num_value_allowed_flag);
RPT(RPT_DBG, "pic_width_in_mbs_minus1: %d", sps_ptr->pic_width_in_mbs_minus1);
RPT(RPT_DBG, "pic_height_in_map_units_minus1: %d", sps_ptr->pic_height_in_map_units_minus1);
RPT(RPT_DBG, "frame_mbs_only_flag: %d", sps_ptr->frame_mbs_only_flag);
RPT(RPT_DBG, "mb_adaptive_frame_field_flag: %d", sps_ptr->mb_adaptive_frame_field_flag);
RPT(RPT_DBG, "direct_8x8_inference_flag: %d", sps_ptr->direct_8x8_inference_flag);
RPT(RPT_DBG, "frame_cropping_flag: %d", sps_ptr->frame_cropping_flag);
RPT(RPT_DBG, "frame_crop_left_offset: %d", sps_ptr->frame_crop_left_offset);
RPT(RPT_DBG, "frame_crop_right_offset: %d", sps_ptr->frame_crop_right_offset);
RPT(RPT_DBG, "frame_crop_top_offset: %d", sps_ptr->frame_crop_top_offset);
RPT(RPT_DBG, "frame_crop_bottom_offset: %d", sps_ptr->frame_crop_bottom_offset);
RPT(RPT_DBG, "vui_parameters_present_flag: %d", sps_ptr->vui_parameters_present_flag);
if(sps_ptr->vui_parameters_present_flag)
{
RPT(RPT_DBG, "aspect_ratio_info_present_flag: %d", sps_ptr->vui_parameters.aspect_ratio_info_present_flag);
RPT(RPT_DBG, "aspect_ratio_idc: %d", sps_ptr->vui_parameters.aspect_ratio_idc);
RPT(RPT_DBG, "sar_width: %d", sps_ptr->vui_parameters.sar_width);
RPT(RPT_DBG, "sar_height: %d", sps_ptr->vui_parameters.sar_height);
RPT(RPT_DBG, "overscan_info_present_flag: %d", sps_ptr->vui_parameters.overscan_info_present_flag);
RPT(RPT_DBG, "overscan_info_appropriate_flag: %d", sps_ptr->vui_parameters.overscan_appropriate_flag);
RPT(RPT_DBG, "video_signal_type_present_flag: %d", sps_ptr->vui_parameters.video_signal_type_present_flag);
RPT(RPT_DBG, "video_format: %d", sps_ptr->vui_parameters.video_format);
RPT(RPT_DBG, "video_full_range_flag: %d", sps_ptr->vui_parameters.video_full_range_flag);
RPT(RPT_DBG, "colour_description_present_flag: %d", sps_ptr->vui_parameters.colour_description_present_flag);
RPT(RPT_DBG, "colour_primaries: %d", sps_ptr->vui_parameters.colour_primaries);
RPT(RPT_DBG, "transfer_characteristics: %d", sps_ptr->vui_parameters.transfer_characteristics);
RPT(RPT_DBG, "matrix_coefficients: %d", sps_ptr->vui_parameters.matrix_coefficients);
RPT(RPT_DBG, "chroma_loc_info_present_flag: %d", sps_ptr->vui_parameters.chroma_loc_info_present_flag);
RPT(RPT_DBG, "chroma_sample_loc_type_top_field: %d", sps_ptr->vui_parameters.chroma_sample_loc_type_top_field);
RPT(RPT_DBG, "chroma_sample_loc_type_bottom_field: %d", sps_ptr->vui_parameters.chroma_sample_loc_type_bottom_field);
RPT(RPT_DBG, "timing_info_present_flag: %d", sps_ptr->vui_parameters.timing_info_present_flag);
RPT(RPT_DBG, "num_units_in_tick: %d", sps_ptr->vui_parameters.num_units_in_tick);
RPT(RPT_DBG, "time_scale: %d", sps_ptr->vui_parameters.time_scale);
RPT(RPT_DBG, "fixed_frame_rate_flag: %d", sps_ptr->vui_parameters.fixed_frame_rate_flag);
RPT(RPT_DBG, "nal_hrd_parameters_present_flag: %d", sps_ptr->vui_parameters.nal_hrd_parameters_present_flag);
RPT(RPT_DBG, "cpb_cnt_minus1: %d", sps_ptr->vui_parameters.cpb_cnt_minus1);
RPT(RPT_DBG, "bit_rate_scale: %d", sps_ptr->vui_parameters.bit_rate_scale);
RPT(RPT_DBG, "cpb_size_scale: %d", sps_ptr->vui_parameters.cpb_size_scale);
RPT(RPT_DBG, "initial_cpb_removal_delay_length_minus1: %d", sps_ptr->vui_parameters.initial_cpb_removal_delay_length_minus1);
RPT(RPT_DBG, "cpb_removal_delay_length_minus1: %d", sps_ptr->vui_parameters.cpb_removal_delay_length_minus1);
RPT(RPT_DBG, "dpb_output_delay_length_minus1: %d", sps_ptr->vui_parameters.dpb_output_delay_length_minus1);
RPT(RPT_DBG, "time_offset_length: %d", sps_ptr->vui_parameters.time_offset_length);
RPT(RPT_DBG, "vcl_hrd_parameters_present_flag: %d", sps_ptr->vui_parameters.vcl_hrd_parameters_present_flag);
RPT(RPT_DBG, "low_delay_hrd_flag: %d", sps_ptr->vui_parameters.low_delay_hrd_flag);
RPT(RPT_DBG, "pic_struct_present_flag: %d", sps_ptr->vui_parameters.pic_struct_present_flag);
RPT(RPT_DBG, "bitstream_restriction_flag: %d", sps_ptr->vui_parameters.bitstream_restriction_flag);
RPT(RPT_DBG, "motion_vectors_over_pic_boundaries_flag: %d", sps_ptr->vui_parameters.motion_vectors_over_pic_boundaries_flag);
RPT(RPT_DBG, "max_bytes_per_pic_denom: %d", sps_ptr->vui_parameters.max_bytes_per_pic_denom);
RPT(RPT_DBG, "max_bits_per_mb_denom: %d", sps_ptr->vui_parameters.max_bits_per_mb_denom);
RPT(RPT_DBG, "log2_max_mv_length_horizontal: %d", sps_ptr->vui_parameters.log2_max_mv_length_horizontal);
RPT(RPT_DBG, "log2_max_mv_length_vertical: %d", sps_ptr->vui_parameters.log2_max_mv_length_vertical);
RPT(RPT_DBG, "num_reorder_frames: %d", sps_ptr->vui_parameters.num_reorder_frames);
RPT(RPT_DBG, "max_dec_frame_buffering: %d", sps_ptr->vui_parameters.max_dec_frame_buffering);
}
}
printf("null\n");
}
#endif
/**
* @brief Function h264dec_seq_parameter_set() h264 SPS infomation 解析
* @param[in] buf buf ptr, 需同步00 00 00 01 X7后传入
* @param[in] sps_ptr sps指针，保存SPS信息
* @retval 0: success, -1 : failure
* @pre
* @post
*/
int h264dec_seq_parameter_set(void *buf_ptr, SPS *sps_ptr)
{
SPS *sps = sps_ptr;
int ret = 0;
int profile_idc = 0;
int i,j,last_scale, next_scale, delta_scale;
void *buf = NULL;
if(NULL == buf_ptr || NULL == sps)
{
RPT(RPT_ERR,"ERR null pointer\n");
ret = -1;
goto exit;
}
memset((void *)sps, 0, sizeof(SPS));
buf = de_emulation_prevention(buf_ptr);
if(NULL == buf)
{
RPT(RPT_ERR,"ERR null pointer\n");
ret = -1;
goto exit;
}
sps->profile_idc = get_bits(buf, 8);
sps->constraint_set0_flag = get_1bit(buf);
sps->constraint_set1_flag = get_1bit(buf);
sps->constraint_set2_flag = get_1bit(buf);
sps->constraint_set3_flag = get_1bit(buf);
sps->reserved_zero_4bits = get_bits(buf, 4);
sps->level_idc = get_bits(buf, 8);
sps->seq_parameter_set_id = parse_ue(buf);
profile_idc = sps->profile_idc;
if( (profile_idc == 100) || (profile_idc == 110) || (profile_idc == 122) || (profile_idc == 244)
|| (profile_idc == 44) || (profile_idc == 83) || (profile_idc == 86) || (profile_idc == 118) ||\
(profile_idc == 128))
{
sps->chroma_format_idc = parse_ue(buf);
if(sps->chroma_format_idc == 3)
{
sps->separate_colour_plane_flag = get_1bit(buf);
}
sps->bit_depth_luma_minus8 = parse_ue(buf);
sps->bit_depth_chroma_minus8 = parse_ue(buf);
sps->qpprime_y_zero_transform_bypass_flag = get_1bit(buf);
sps->seq_scaling_matrix_present_flag = get_1bit(buf);
if(sps->seq_scaling_matrix_present_flag)
{
for(i=0; i<((sps->chroma_format_idc != 3)?8:12); i++)
{
sps->seq_scaling_list_present_flag[i] = get_1bit(buf);
if(sps->seq_scaling_list_present_flag[i])
{
if(i<6)
{
for(j=0; j<16; j++)
{
last_scale = 8;
next_scale = 8;
if(next_scale != 0)
{
delta_scale = parse_se(buf);
next_scale = (last_scale + delta_scale + 256)%256;
sps->UseDefaultScalingMatrix4x4Flag[i] = ((j == 0) && (next_scale == 0));
}
sps->ScalingList4x4[i][j] = (next_scale == 0)?last_scale:next_scale;
last_scale = sps->ScalingList4x4[i][j];
}
}
else
{
int ii = i-6;
next_scale = 8;
last_scale = 8;
for(j=0; j<64; j++)
{
if(next_scale != 0)
{
delta_scale = parse_se(buf);
next_scale = (last_scale + delta_scale + 256)%256;
sps->UseDefaultScalingMatrix8x8Flag[ii] = ((j == 0) && (next_scale == 0));
}
sps->ScalingList8x8[ii][j] = (next_scale == 0)?last_scale:next_scale;
last_scale = sps->ScalingList8x8[ii][j];
}
}
}
}
}
}
sps->log2_max_frame_num_minus4 = parse_ue(buf);
sps->pic_order_cnt_type = parse_ue(buf);
if(sps->pic_order_cnt_type == 0)
{
sps->log2_max_pic_order_cnt_lsb_minus4 = parse_ue(buf);
}
else if(sps->pic_order_cnt_type == 1)
{
sps->delta_pic_order_always_zero_flag = get_1bit(buf);
sps->offset_for_non_ref_pic = parse_se(buf);
sps->offset_for_top_to_bottom_field = parse_se(buf);
sps->num_ref_frames_in_pic_order_cnt_cycle = parse_ue(buf);
for(i=0; i<sps->num_ref_frames_in_pic_order_cnt_cycle; i++)
{
sps->offset_for_ref_frame_array[i] = parse_se(buf);
}
}
sps->num_ref_frames = parse_ue(buf);
sps->gaps_in_frame_num_value_allowed_flag = get_1bit(buf);
sps->pic_width_in_mbs_minus1 = parse_ue(buf);
sps->pic_height_in_map_units_minus1 = parse_ue(buf);
sps->frame_mbs_only_flag = get_1bit(buf);
if(!sps->frame_mbs_only_flag)
{
sps->mb_adaptive_frame_field_flag = get_1bit(buf);
}
sps->direct_8x8_inference_flag = get_1bit(buf);
sps->frame_cropping_flag = get_1bit(buf);
if(sps->frame_cropping_flag)
{
sps->frame_crop_left_offset = parse_ue(buf);
sps->frame_crop_right_offset = parse_ue(buf);
sps->frame_crop_top_offset = parse_ue(buf);
sps->frame_crop_bottom_offset = parse_ue(buf);
}
sps->vui_parameters_present_flag = get_1bit(buf);
if(sps->vui_parameters_present_flag)
{
vui_parameters_set(buf, &sps->vui_parameters);
}
exit:
get_bit_context_free(buf);
return ret;
}
/**
* @brief Function more_rbsp_data() 计算pps串最后一个为1的比特位及其后都是比特0的个数
* @param[in] buf get_bit_context structure
* @retval
* @pre
* @post
* @note 这段代码来自网友的帮助，并没有验证，使用时需注意
*/
static int more_rbsp_data(void *buf)
{
get_bit_context *ptr = (get_bit_context *)buf;
get_bit_context tmp;
if(NULL == buf)
{
RPT(RPT_ERR, "NULL pointer, err");
return -1;
}
memset(&tmp, 0, sizeof(get_bit_context));
memcpy(&tmp, ptr, sizeof(get_bit_context));
for(tmp.bit_pos = ptr->total_bit - 1;tmp.bit_pos > ptr->bit_pos;tmp.bit_pos -= 2)
{
if(get_1bit(&tmp))
{
break;
}
}
return tmp.bit_pos == ptr->bit_pos? 0:1;
}
/**
* @brief Function h264dec_picture_parameter_set() h264 PPS infomation 解析
* @param[in] buf buf ptr, 需同步00 00 00 01 X8后传入
* @param[in] pps_ptr pps指针，保存pps信息
* @retval 0: success, -1 : failure
* @pre
* @post
*/
int h264dec_picture_parameter_set(void *buf_ptr, PPS *pps_ptr)
{
PPS *pps = pps_ptr;
int ret = 0;
void *buf = NULL;
int iGroup = 0;
int i,j,last_scale, next_scale, delta_scale;
if(NULL == buf_ptr || NULL == pps_ptr)
{
RPT(RPT_ERR, "NULL pointer\n");
ret = -1;
goto exit;
}
memset((void *)pps, 0, sizeof(PPS));
buf = de_emulation_prevention(buf_ptr);
if(NULL == buf)
{
RPT(RPT_ERR,"ERR null pointer\n");
ret = -1;
goto exit;
}
pps->pic_parameter_set_id = parse_ue(buf);
pps->seq_parameter_set_id = parse_ue(buf);
pps->entropy_coding_mode_flag = get_1bit(buf);
pps->pic_order_present_flag = get_1bit(buf);
pps->num_slice_groups_minus1 = parse_ue(buf);
if(pps->num_slice_groups_minus1 > 0)
{
pps->slice_group_map_type = parse_ue(buf);
if(pps->slice_group_map_type == 0)
{
for(iGroup=0; iGroup<=pps->num_slice_groups_minus1; iGroup++)
{
pps->run_length_minus1[iGroup] = parse_ue(buf);
}
}
else if(pps->slice_group_map_type == 2)
{
for(iGroup=0; iGroup<=pps->num_slice_groups_minus1; iGroup++)
{
pps->top_left[iGroup] = parse_ue(buf);
pps->bottom_right[iGroup] = parse_ue(buf);
}
}
else if(pps->slice_group_map_type == 3 \
||pps->slice_group_map_type == 4\
||pps->slice_group_map_type == 5)
{
pps->slice_group_change_direction_flag = get_1bit(buf);
pps->slice_group_change_rate_minus1 = parse_ue(buf);
}
else if(pps->slice_group_map_type == 6)
{
pps->pic_size_in_map_units_minus1 = parse_ue(buf);
for(i=0; i<pps->pic_size_in_map_units_minus1; i++)
{
/*这地方可能有问题，对u(v)理解偏差*/
pps->slice_group_id[i] = get_bits(buf, pps->pic_size_in_map_units_minus1);
}
}
}
pps->num_ref_idx_10_active_minus1 = parse_ue(buf);
pps->num_ref_idx_11_active_minus1 = parse_ue(buf);
pps->weighted_pred_flag = get_1bit(buf);
pps->weighted_bipred_idc = get_bits(buf, 2);
pps->pic_init_qp_minus26 = parse_se(buf); /*relative26*/
pps->pic_init_qs_minus26 = parse_se(buf); /*relative26*/
pps->chroma_qp_index_offset = parse_se(buf);
pps->deblocking_filter_control_present_flag = get_1bit(buf);
pps->constrained_intra_pred_flag = get_1bit(buf);
pps->redundant_pic_cnt_present_flag = get_1bit(buf);
if(more_rbsp_data(buf))
{
pps->transform_8x8_mode_flag = get_1bit(buf);
pps->pic_scaling_matrix_present_flag = get_1bit(buf);
if(pps->pic_scaling_matrix_present_flag)
{
for(i=0; i<6+2*pps->transform_8x8_mode_flag; i++)
{
pps->pic_scaling_list_present_flag[i] = get_1bit(buf);
if(pps->pic_scaling_list_present_flag[i])
{
if(i<6)
{
for(j=0; j<16; j++)
{
next_scale = 8;
last_scale = 8;
if(next_scale != 0)
{
delta_scale = parse_se(buf);
next_scale = (last_scale + delta_scale + 256)%256;
pps->UseDefaultScalingMatrix4x4Flag[i] = ((j == 0) && (next_scale == 0));
}
pps->ScalingList4x4[i][j] = (next_scale == 0)?last_scale:next_scale;
last_scale = pps->ScalingList4x4[i][j];
}
}
else
{
int ii = i-6;
next_scale = 8;
last_scale = 8;
for(j=0; j<64; j++)
{
if(next_scale != 0)
{
delta_scale = parse_se(buf);
next_scale = (last_scale + delta_scale + 256)%256;
pps->UseDefaultScalingMatrix8x8Flag[ii] = ((j == 0) && (next_scale == 0));
}
pps->ScalingList8x8[ii][j] = (next_scale == 0)?last_scale:next_scale;
last_scale = pps->ScalingList8x8[ii][j];
}
}
}
}
pps->second_chroma_qp_index_offset = parse_se(buf);
}
}
exit:
get_bit_context_free(buf);
return ret;
}
// calculation width height and framerate
int h264_get_width(SPS *sps_ptr)
{
if(!sps_ptr->pic_width_in_mbs_minus1) return 0;//自定义
return (sps_ptr->pic_width_in_mbs_minus1 + 1) * 16;
}
int h264_get_height(SPS *sps_ptr)
{
if(!sps_ptr->pic_height_in_map_units_minus1) return 0;//自定义
return (sps_ptr->pic_height_in_map_units_minus1 + 1) * 16 * (2 - sps_ptr->frame_mbs_only_flag);
}
int h264_get_format(SPS *sps_ptr)
{
return sps_ptr->frame_mbs_only_flag;
}
int h264_get_profile_idc(SPS *sps_ptr)
{
return (sps_ptr->profile_idc);
}
int h264_get_level_idc(SPS *sps_ptr)
{
return ( sps_ptr->level_idc);
}
/*
1 - 23.98
2 - 24
3 - 25
4 - 29.97
5 - 30
6 - 50
7 - 59.94
8 - 60
9 - 6
10 - 8
11 - 12
12 - 15
13 - 10.
*/
int h264_get_framerates(float *framerate,SPS *sps_ptr)
{
//int fr;
int fr_int=0;
if(sps_ptr->vui_parameters.timing_info_present_flag)
{
if(sps_ptr->frame_mbs_only_flag)
{
*framerate = (float)sps_ptr->vui_parameters.time_scale / (float)sps_ptr->vui_parameters.num_units_in_tick;
//fr_int = sps_ptr->vui_parameters.time_scale / sps_ptr->vui_parameters.num_units_in_tick;
}else
{
*framerate = (float)sps_ptr->vui_parameters.time_scale / (float)sps_ptr->vui_parameters.num_units_in_tick / 2.0;
//fr_int = sps_ptr->vui_parameters.time_scale / sps_ptr->vui_parameters.num_units_in_tick / 2;
}
fr_int = sps_ptr->vui_parameters.time_scale / sps_ptr->vui_parameters.num_units_in_tick / 2;
}
/*
switch(fr_int)
{
case 23:// 23.98
fr = 1;
break;
case 24:
fr = 2;
break;
case 25:
fr = 3;
break;
case 29://29.97
fr = 4;
break;
case 30:
fr = 5;
break;
case 50:
fr = 6;
break;
case 59://59.94
fr = 7;
break;
case 60:
fr = 8;
break;
case 6:
fr = 10;
break;
case 8:
fr = 11;
break;
case 12:
fr = 12;
break;
case 15:
fr = 13;
break;
case 10:
fr = 14;
break;
default:
fr = 0;
break;
}
return fr;
*/
return fr_int;
}
int h264_get_framerate(SPS *sps_ptr)
{
//int fr;
int fr_int=0;
if(sps_ptr->vui_parameters.timing_info_present_flag)
{
fr_int = sps_ptr->vui_parameters.time_scale / sps_ptr->vui_parameters.num_units_in_tick / 2;
}
return fr_int;
}
// for mpeg-2
void memcpy_sps_data(uint8_t *dst,uint8_t *src,int len)
{