int nal_decode(nal_t nal, void *p_data, int i_data)
{
byte *src = (byte *)p_data;
byte *end = &src[i_data];
byte *dst = nal.p_payload;
nal.i_type = src[0] & 0x1f;
nal.i_ref_idc = (src[0] >> 5) & 0x03;
src++;
while (src < end)
{
if (src < end - 3 && src[0] == 0x00 && src[1] == 0x00 && src[2] == 0x03)
{
*dst++ = 0x00;
*dst++ = 0x00;
src += 3;
continue;
}
*dst++ = *src++;
}
//nal.i_payload = dst - (uint8_t*)p_data;//tangxiaojun
nal.i_payload = (int)(dst - nal.p_payload);//tangxiaojun
return(0);
}
int ParseNAL(nal_t nal, avi_t a, h264_t h, int *pb_slice)
{
int b_flush = 0;
int b_start;
h264_parser_parse(h, nal, &b_start);
if (b_start != 0 && *pb_slice != 0)
{
b_flush = 1;
*pb_slice = 0;
}
if (nal.i_type >= (int)nal_unit_type_e.NAL_SLICE && nal.i_type <= (int)nal_unit_type_e.NAL_SLICE_IDR)
{
*pb_slice = 1;
}
return(b_flush);
}
public CAvcToAvi()
{
cfg = new cfg_t();
cfg.f_fps = 24;
cfg.fcc = "h264";
/* Init data */
b_eof = 0;
b_key = 0;
b_slice = 0;
i_frame = 0;
i_data = 0;
avi = new avi_t();
h264 = new h264_t();
nal = new nal_t();
nal.p_payload = (byte *)Marshal.AllocHGlobal(DATA_MAX).ToPointer();
vb = new vbuf_t();
data = (byte *)Marshal.AllocHGlobal(DATA_MAX).ToPointer();
}
void h264_parser_parse(h264_t h, nal_t nal, int *pb_nal_start)
{
bs_s s = new bs_s();
*pb_nal_start = 0;
if (nal.i_type == (int)nal_unit_type_e.NAL_SPS || nal.i_type == (int)nal_unit_type_e.NAL_PPS)
{
*pb_nal_start = 1;
}
bs_init(s, nal.p_payload, nal.i_payload);
if (nal.i_type == (int)nal_unit_type_e.NAL_SPS)
{
uint i_tmp;
i_tmp = bs_read(s, 8);
bs_skip(s, 1 + 1 + 1 + 5 + 8);
/* sps id */
bs_read_ue(s);
if (i_tmp >= 100)
{
bs_read_ue(s); // chroma_format_idc
bs_read_ue(s); // bit_depth_luma_minus8
bs_read_ue(s); // bit_depth_chroma_minus8
bs_skip(s, 1); // qpprime_y_zero_transform_bypass_flag
if (bs_read(s, 1) > 0) // seq_scaling_matrix_present_flag
{
int i, j;
for (i = 0; i < 8; i++)
{
if (bs_read(s, 1) > 0) // seq_scaling_list_present_flag[i]
{
i_tmp = 8;
for (j = 0; j < (i < 6 ? 16 : 64); j++)
{
i_tmp += (uint)bs_read_se(s);
if (i_tmp == 0)
{
break;
}
}
}
}
}
}
/* Skip i_log2_max_frame_num */
h.i_log2_max_frame_num = bs_read_ue(s) + 4;
/* Read poc_type */
h.i_poc_type = bs_read_ue(s);
if (h.i_poc_type == 0)
{
h.i_log2_max_poc_lsb = bs_read_ue(s) + 4;
}
else if (h.i_poc_type == 1)
{
int i_cycle;
/* skip b_delta_pic_order_always_zero */
bs_skip(s, 1);
/* skip i_offset_for_non_ref_pic */
bs_read_se(s);
/* skip i_offset_for_top_to_bottom_field */
bs_read_se(s);
/* read i_num_ref_frames_in_poc_cycle */
i_cycle = bs_read_ue(s);
if (i_cycle > 256)
{
i_cycle = 256;
}
while (i_cycle > 0)
{
/* skip i_offset_for_ref_frame */
bs_read_se(s);
}
}
/* i_num_ref_frames */
bs_read_ue(s);
/* b_gaps_in_frame_num_value_allowed */
bs_skip(s, 1);
/* Read size */
h.i_width = 16 * (bs_read_ue(s) + 1);
h.i_height = 16 * (bs_read_ue(s) + 1);
/* b_frame_mbs_only */
i_tmp = bs_read(s, 1);
if (i_tmp == 0)
{
bs_skip(s, 1);
}
/* b_direct8x8_inference */
bs_skip(s, 1);
/* crop ? */
i_tmp = bs_read(s, 1);
if (i_tmp != 0)
{
/* left */
h.i_width -= 2 * bs_read_ue(s);
/* right */
h.i_width -= 2 * bs_read_ue(s);
/* top */
h.i_height -= 2 * bs_read_ue(s);
/* bottom */
h.i_height -= 2 * bs_read_ue(s);
}
/* vui: ignored */
/*2012.8.9*/
i_tmp = bs_read(s, 1);
if (i_tmp != 0)
{
bs_skip(s, 4);
i_tmp = bs_read(s, 1);
if (i_tmp != 0)
{
h.i_tick = (int)bs_read(s, 32);
h.i_time_scale = (int)bs_read(s, 32);
h.vui_flag = true;
}
}
}
else if (nal.i_type >= (int)nal_unit_type_e.NAL_SLICE && nal.i_type <= (int)nal_unit_type_e.NAL_SLICE_IDR)
{
int i_tmp;
/* i_first_mb */
bs_read_ue(s);
/* picture type */
switch (bs_read_ue(s))
{
case 0:
case 5: /* P */
case 1:
case 6: /* B */
case 3:
case 8: /* SP */
h.b_key = 0;
break;
case 2:
case 7: /* I */
case 4:
case 9: /* SI */
h.b_key = (nal.i_type == (int)nal_unit_type_e.NAL_SLICE_IDR) ? 1 : 0;
break;
}
/* pps id */
bs_read_ue(s);
/* frame num */
i_tmp = (int)bs_read(s, h.i_log2_max_frame_num);
if (i_tmp != h.i_frame_num)
{
*pb_nal_start = 1;
}
h.i_frame_num = i_tmp;
if (nal.i_type == (int)nal_unit_type_e.NAL_SLICE_IDR)
{
i_tmp = bs_read_ue(s);
if (h.i_nal_type == (int)nal_unit_type_e.NAL_SLICE_IDR && h.i_idr_pic_id != i_tmp)
{
*pb_nal_start = 1;
}
h.i_idr_pic_id = i_tmp;
}
if (h.i_poc_type == 0)
{
i_tmp = (int)bs_read(s, h.i_log2_max_poc_lsb);
if (i_tmp != h.i_poc)
{
*pb_nal_start = 1;
}
h.i_poc = i_tmp;
}
}
h.i_nal_type = nal.i_type;
h.i_ref_idc = nal.i_ref_idc;
}
