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vdr-plugin-femon/h264.c
Rolf Ahrenberg 0ed9e37d52 Fix bitstream parsing.
2017-02-26 14:58:07 +02:00

760 lines
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/*
* h264.c: Frontend Status Monitor plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include "log.h"
#include "tools.h"
#include "h264.h"
const cFemonH264::t_DAR cFemonH264::darS[] =
{
{ VIDEO_ASPECT_RATIO_1_1, 100 },
{ VIDEO_ASPECT_RATIO_4_3, 133 },
{ VIDEO_ASPECT_RATIO_16_9, 177 },
{ VIDEO_ASPECT_RATIO_2_21_1, 221 },
{ VIDEO_ASPECT_RATIO_12_11, 109 },
{ VIDEO_ASPECT_RATIO_10_11, 90 },
{ VIDEO_ASPECT_RATIO_16_11, 145 },
{ VIDEO_ASPECT_RATIO_40_33, 121 },
{ VIDEO_ASPECT_RATIO_24_11, 218 },
{ VIDEO_ASPECT_RATIO_20_11, 181 },
{ VIDEO_ASPECT_RATIO_32_11, 290 },
{ VIDEO_ASPECT_RATIO_80_33, 242 },
{ VIDEO_ASPECT_RATIO_18_11, 163 },
{ VIDEO_ASPECT_RATIO_15_11, 136 },
{ VIDEO_ASPECT_RATIO_64_33, 193 },
{ VIDEO_ASPECT_RATIO_160_99, 161 },
{ VIDEO_ASPECT_RATIO_3_2, 150 },
{ VIDEO_ASPECT_RATIO_2_1, 200 }
};
const cFemonH264::t_SAR cFemonH264::sarS[] =
{
{ 0, 0 }, // VIDEO_ASPECT_RATIO_INVALID
{ 1, 1 }, // VIDEO_ASPECT_RATIO_1_1
{ 12, 11 }, // VIDEO_ASPECT_RATIO_12_11
{ 10, 11 }, // VIDEO_ASPECT_RATIO_10_11
{ 16, 11 }, // VIDEO_ASPECT_RATIO_16_11
{ 40, 33 }, // VIDEO_ASPECT_RATIO_40_33
{ 24, 11 }, // VIDEO_ASPECT_RATIO_24_11
{ 20, 11 }, // VIDEO_ASPECT_RATIO_20_11
{ 32, 11 }, // VIDEO_ASPECT_RATIO_32_11
{ 80, 33 }, // VIDEO_ASPECT_RATIO_80_33
{ 18, 11 }, // VIDEO_ASPECT_RATIO_18_11
{ 15, 11 }, // VIDEO_ASPECT_RATIO_15_11
{ 64, 33 }, // VIDEO_ASPECT_RATIO_64_33
{ 160, 99 }, // VIDEO_ASPECT_RATIO_160_99
{ 4, 3 }, // VIDEO_ASPECT_RATIO_4_3
{ 3, 2 }, // VIDEO_ASPECT_RATIO_3_2
{ 2, 1 } // VIDEO_ASPECT_RATIO_2_1
};
const eVideoFormat cFemonH264::videoFormatS[] =
{
VIDEO_FORMAT_COMPONENT,
VIDEO_FORMAT_PAL,
VIDEO_FORMAT_NTSC,
VIDEO_FORMAT_SECAM,
VIDEO_FORMAT_MAC,
VIDEO_FORMAT_UNKNOWN,
VIDEO_FORMAT_RESERVED
};
const uint8_t cFemonH264::seiNumClockTsTableS[9] =
{
1, 1, 1, 2, 2, 3, 3, 2, 3
};
cFemonH264::cFemonH264(cFemonVideoIf *videoHandlerP)
: videoHandlerM(videoHandlerP),
widthM(0),
heightM(0),
aspectRatioM(VIDEO_ASPECT_RATIO_INVALID),
formatM(VIDEO_FORMAT_INVALID),
frameRateM(0),
bitRateM(0),
scanM(VIDEO_SCAN_INVALID),
cpbDpbDelaysPresentFlagM(false),
picStructPresentFlagM(false),
frameMbsOnlyFlagM(false),
mbAdaptiveFrameFieldFlagM(false),
timeOffsetLengthM(0)
{
reset();
}
cFemonH264::~cFemonH264()
{
}
bool cFemonH264::processVideo(const uint8_t *bufP, int lenP)
{
uint8_t nal_data[lenP];
bool aud_found = false, sps_found = false, sei_found = true; // SEI temporarily disabled!
const uint8_t *buf = bufP;
const uint8_t *start = buf;
const uint8_t *end = start + lenP;
if (!videoHandlerM)
return false;
// skip PES header
if (!PesLongEnough(lenP))
return false;
buf += PesPayloadOffset(buf);
start = buf;
reset();
for (;;) {
int consumed = 0;
buf = nextStartCode(buf, end);
if (buf >= end)
break;
switch (buf[3] & 0x1F) {
case NAL_AUD:
if (!aud_found) {
switch (buf[4] >> 5) {
case 0: case 3: case 5: // I_FRAME
debug2("%s Found NAL AUD at offset %d/%d", __PRETTY_FUNCTION__, int(buf - start), lenP);
aud_found = true;
break;
case 1: case 4: case 6: // P_FRAME;
case 2: case 7: // B_FRAME;
default: // NO_PICTURE;
break;
}
}
break;
case NAL_SPS:
if (!sps_found) {
debug2("%s Found NAL SPS at offset %d/%d", __PRETTY_FUNCTION__, int(buf - start), lenP);
int nal_len = nalUnescape(nal_data, buf + 4, int(end - buf - 4));
consumed = parseSPS(nal_data, nal_len);
if (consumed > 0)
sps_found = true;
}
break;
case NAL_SEI:
if (!sei_found) {
debug2("%s Found NAL SEI at offset %d/%d", __PRETTY_FUNCTION__, int(buf - start), lenP);
int nal_len = nalUnescape(nal_data, buf + 4, int(end - buf - 4));
consumed = parseSEI(nal_data, nal_len);
if (consumed > 0)
sei_found = true;
}
break;
default:
break;
}
if (aud_found && sps_found && sei_found)
break;
buf += consumed + 4;
}
if (aud_found) {
videoHandlerM->SetVideoCodec(VIDEO_CODEC_H264);
if (sps_found) {
debug2("%s width=%d height=%d, aspect=%d format=%d bitrate=%.0f", __PRETTY_FUNCTION__, widthM, heightM, aspectRatioM, formatM, bitRateM);
videoHandlerM->SetVideoFormat(formatM);
videoHandlerM->SetVideoSize(widthM, heightM);
videoHandlerM->SetVideoAspectRatio(aspectRatioM);
videoHandlerM->SetVideoBitrate(bitRateM);
}
if (sps_found || sei_found) {
debug2("%s scan=%d framerate=%.2f", __PRETTY_FUNCTION__, scanM, (scanM == VIDEO_SCAN_PROGRESSIVE) ? (frameRateM / 2) : frameRateM);
videoHandlerM->SetVideoScan(scanM);
videoHandlerM->SetVideoFramerate((scanM == VIDEO_SCAN_PROGRESSIVE) ? (frameRateM / 2) : frameRateM);
}
}
return aud_found;
}
void cFemonH264::reset()
{
cpbDpbDelaysPresentFlagM = false;
picStructPresentFlagM = false;
frameMbsOnlyFlagM = false;
mbAdaptiveFrameFieldFlagM = false;
timeOffsetLengthM = 0;
}
const uint8_t *cFemonH264::nextStartCode(const uint8_t *startP, const uint8_t *endP)
{
for (endP -= 3; startP < endP; ++startP) {
if ((startP[0] == 0x00) && (startP[1] == 0x00) && (startP[2] == 0x01))
return startP;
}
return (endP + 3);
}
int cFemonH264::nalUnescape(uint8_t *dstP, const uint8_t *srcP, int lenP)
{
int s = 0, d = 0;
while (s < lenP - 3) {
if (!srcP[s] && !srcP[s + 1] && srcP[s + 2] == 3) {
dstP[d++] = srcP[s++];
dstP[d++] = srcP[s++];
s++; // skip emulation_prevention_three_byte
}
else
dstP[d++] = srcP[s++];
}
while (s < lenP)
dstP[d++] = srcP[s++];
return d;
}
int cFemonH264::parseSPS(const uint8_t *bufP, int lenP)
{
int profile_idc, level_idc, constraint_set3_flag, pic_order_cnt_type, i, j;
cFemonBitStream bs(bufP, lenP);
uint32_t width = widthM;
uint32_t height = heightM;
eVideoAspectRatio aspect_ratio = aspectRatioM;
eVideoFormat format = formatM;
double frame_rate = frameRateM;
double bit_rate = bitRateM;
bool cpb_dpb_delays_present_flag = cpbDpbDelaysPresentFlagM;
bool pic_struct_present_flag = picStructPresentFlagM;
bool frame_mbs_only_flag = frameMbsOnlyFlagM;
bool mb_adaptive_frame_field_flag = mbAdaptiveFrameFieldFlagM;
uint32_t time_offset_length = timeOffsetLengthM;
profile_idc = bs.GetBits(8); // profile_idc
bs.SkipBit(); // constraint_set0_flag
bs.SkipBit(); // constraint_set1_flag
bs.SkipBit(); // constraint_set2_flag
constraint_set3_flag = bs.GetBit(); // constraint_set3_flag
bs.SkipBits(4); // reserved_zero_4bits
level_idc = bs.GetBits(8); // level_idc
bs.SkipUeGolomb(); // seq_parameter_set_id
debug2("%s profile_idc=%d level_idc=%d", __PRETTY_FUNCTION__, profile_idc, level_idc);
switch (profile_idc) {
case 66: // baseline profile
case 77: // main profile
case 88: // extended profile
switch (level_idc) {
case 10: // level 1.0
bit_rate = 64000;
break;
case 11: // level 1b / 1.1
bit_rate = constraint_set3_flag ? 128000 : 192000;
break;
case 12: // level 1.2
bit_rate = 384000;
break;
case 13: // level 1.3
bit_rate = 768000;
break;
case 20: // level 2.0
bit_rate = 2000000;
break;
case 21: // level 2.1
bit_rate = 4000000;
break;
case 22: // level 2.2
bit_rate = 4000000;
break;
case 30: // level 3.0
bit_rate = 10000000;
break;
case 31: // level 3.1
bit_rate = 14000000;
break;
case 32: // level 3.2
bit_rate = 20000000;
break;
case 40: // level 4.0
bit_rate = 20000000;
break;
case 41: // level 4.1
bit_rate = 50000000;
break;
case 42: // level 4.2
bit_rate = 50000000;
break;
case 50: // level 5.0
bit_rate = 135000000;
break;
case 51: // level 5.1
bit_rate = 240000000;
break;
default:
break;
}
break;
case 100: // high profile
switch (level_idc) {
case 10: // level 1.0
bit_rate = 80000;
break;
case 11: // level 1b / 1.1
bit_rate = constraint_set3_flag ? 160000 : 240000;
break;
case 12: // level 1.2
bit_rate = 480000;
break;
case 13: // level 1.3
bit_rate = 960000;
break;
case 20: // level 2.0
bit_rate = 2500000;
break;
case 21: // level 2.1
bit_rate = 5000000;
break;
case 22: // level 2.2
bit_rate = 5000000;
break;
case 30: // level 3.0
bit_rate = 12500000;
break;
case 31: // level 3.1
bit_rate = 17500000;
break;
case 32: // level 3.2
bit_rate = 25000000;
break;
case 40: // level 4.0
bit_rate = 25000000;
break;
case 41: // level 4.1
bit_rate = 62500000;
break;
case 42: // level 4.2
bit_rate = 62500000;
break;
case 50: // level 5.0
bit_rate = 168750000;
break;
case 51: // level 5.1
bit_rate = 300000000;
break;
default:
break;
}
break;
case 110: // high 10 profile
switch (level_idc) {
case 10: // level 1.0
bit_rate = 192000;
break;
case 11: // level 1b / 1.1
bit_rate = constraint_set3_flag ? 384000 : 576000;
break;
case 12: // level 1.2
bit_rate = 115200;
break;
case 13: // level 1.3
bit_rate = 2304000;
break;
case 20: // level 2.0
bit_rate = 6000000;
break;
case 21: // level 2.1
bit_rate = 12000000;
break;
case 22: // level 2.2
bit_rate = 12000000;
break;
case 30: // level 3.0
bit_rate = 30000000;
break;
case 31: // level 3.1
bit_rate = 42000000;
break;
case 32: // level 3.2
bit_rate = 60000000;
break;
case 40: // level 4.0
bit_rate = 60000000;
break;
case 41: // level 4.1
bit_rate = 150000000;
break;
case 42: // level 4.2
bit_rate = 150000000;
break;
case 50: // level 5.0
bit_rate = 405000000;
break;
case 51: // level 5.1
bit_rate = 720000000;
break;
default:
break;
}
break;
case 122: // high 4:2:2 profile
case 144: // high 4:4:4 profile
switch (level_idc) {
case 10: // level 1.0
bit_rate = 256000;
break;
case 11: // level 1b / 1.1
bit_rate = constraint_set3_flag ? 512000 : 768000;
break;
case 12: // level 1.2
bit_rate = 1536000;
break;
case 13: // level 1.3
bit_rate = 3072000;
break;
case 20: // level 2.0
bit_rate = 8000000;
break;
case 21: // level 2.1
bit_rate = 16000000;
break;
case 22: // level 2.2
bit_rate = 16000000;
break;
case 30: // level 3.0
bit_rate = 40000000;
break;
case 31: // level 3.1
bit_rate = 56000000;
break;
case 32: // level 3.2
bit_rate = 80000000;
break;
case 40: // level 4.0
bit_rate = 80000000;
break;
case 41: // level 4.1
bit_rate = 200000000;
break;
case 42: // level 4.2
bit_rate = 200000000;
break;
case 50: // level 5.0
bit_rate = 540000000;
break;
case 51: // level 5.1
bit_rate = 960000000;
break;
default:
break;
}
break;
default:
break;
}
if ((profile_idc == 100) || (profile_idc == 110) || (profile_idc == 122) || (profile_idc == 144)) {
if (bs.GetUeGolomb() == 3) // chroma_format_idc
bs.SkipBit(); // residual_colour_transform_flag
bs.SkipUeGolomb(); // bit_depth_luma_minus8
bs.SkipUeGolomb(); // bit_depth_chroma_minus8
bs.SkipBit(); // qpprime_y_zero_transform_bypass_flag
if (bs.GetBit()) { // seq_scaling_matrix_present_flag
for (i = 0; i < 8; ++i) {
if (bs.GetBit()) { // seq_scaling_list_present_flag[i]
int last = 8, next = 8, size = (i < 6) ? 16 : 64;
for (j = 0; j < size; ++j) {
if (next)
next = (last + bs.GetSeGolomb()) & 0xff;
last = next ?: last;
}
}
}
}
}
bs.SkipUeGolomb(); // log2_max_frame_num_minus4
pic_order_cnt_type = bs.GetUeGolomb(); // pic_order_cnt_type
if (pic_order_cnt_type == 0)
bs.SkipUeGolomb(); // log2_max_pic_order_cnt_lsb_minus4
else if (pic_order_cnt_type == 1) {
bs.SkipBit(); // delta_pic_order_always_zero
bs.SkipSeGolomb(); // offset_for_non_ref_pic
bs.SkipSeGolomb(); // offset_for_top_to_bottom_field
j = bs.GetUeGolomb(); // num_ref_frames_in_pic_order_cnt_cycle
for (i = 0; i < j; ++i)
bs.SkipSeGolomb(); // offset_for_ref_frame[i]
}
bs.SkipUeGolomb(); // num_ref_frames
bs.SkipBit(); // gaps_in_frame_num_value_allowed_flag
width = bs.GetUeGolomb() + 1; // pic_width_in_mbs_minus1
height = bs.GetUeGolomb() + 1; // pic_height_in_mbs_minus1
frame_mbs_only_flag = bs.GetBit(); // frame_mbs_only_flag
debug2("%s pic_width=%u", __PRETTY_FUNCTION__, width);
debug2("%s pic_height=%u", __PRETTY_FUNCTION__, height);
debug2("%s frame_mbs_only_flag=%d", __PRETTY_FUNCTION__, frame_mbs_only_flag);
width *= 16;
height *= 16 * (frame_mbs_only_flag ? 1 : 2);
if (!frame_mbs_only_flag)
mb_adaptive_frame_field_flag = bs.GetBit(); // mb_adaptive_frame_field_flag
bs.SkipBit(); // direct_8x8_inference_flag
if (bs.GetBit()) { // frame_cropping_flag
uint32_t crop_left, crop_right, crop_top, crop_bottom;
crop_left = bs.GetUeGolomb(); // frame_crop_left_offset
crop_right = bs.GetUeGolomb(); // frame_crop_rigth_offset
crop_top = bs.GetUeGolomb(); // frame_crop_top_offset
crop_bottom = bs.GetUeGolomb(); // frame_crop_bottom_offset
debug2("%s crop_left=%d crop_top=%d crop_right=%d crop_bottom=%d", __PRETTY_FUNCTION__, crop_left, crop_top, crop_right, crop_bottom);
width -= 2 * (crop_left + crop_right);
if (frame_mbs_only_flag)
height -= 2 * (crop_top + crop_bottom);
else
height -= 4 * (crop_top + crop_bottom);
}
// VUI parameters
if (bs.GetBit()) { // vui_parameters_present_flag
if (bs.GetBit()) { // aspect_ratio_info_present
uint32_t aspect_ratio_idc, sar_width = 0, sar_height = 0;
aspect_ratio_idc = bs.GetBits(8); // aspect_ratio_idc
debug2("%s aspect_ratio_idc=%d", __PRETTY_FUNCTION__, aspect_ratio_idc);
if (aspect_ratio_idc == 255) { // extended sar
sar_width = bs.GetBits(16); // sar_width
sar_height = bs.GetBits(16); // sar_height
}
else if (aspect_ratio_idc < ELEMENTS(sarS)) {
sar_width = sarS[aspect_ratio_idc].w;
sar_height = sarS[aspect_ratio_idc].h;
}
if (sar_width && sar_height) {
int index = -1, ratio = int(100.0L * sar_width * width / sar_height / height);
for (unsigned int i = 0; i < ELEMENTS(darS); ++i) {
if (darS[i].ratio == ratio) {
index = i;
break;
}
}
if (index < 0) {
if (aspect_ratio_idc == 255)
aspect_ratio = VIDEO_ASPECT_RATIO_EXTENDED;
else
aspect_ratio = VIDEO_ASPECT_RATIO_INVALID;
}
else
aspect_ratio = darS[index].dar;
debug2("%s sar_width=%d sar_height=%d aspect_ratio=%d", __PRETTY_FUNCTION__, sar_width, sar_height, aspect_ratio);
}
}
if (bs.GetBit()) // overscan_info_present_flag
bs.SkipBit(); // overscan_approriate_flag
if (bs.GetBit()) { // video_signal_type_present_flag
uint32_t video_format;
video_format = bs.GetBits(3); // video_format
if (video_format < ELEMENTS(videoFormatS)) {
format = videoFormatS[video_format];
debug2("%s video_format=%d", __PRETTY_FUNCTION__, format);
}
bs.SkipBit(); // video_full_range_flag
if (bs.GetBit()) { // colour_description_present_flag
bs.SkipBits(8); // colour_primaries
bs.SkipBits(8); // transfer_characteristics
bs.SkipBits(8); // matrix_coefficients
}
}
if (bs.GetBit()) { // chroma_loc_info_present_flag
bs.SkipUeGolomb(); // chroma_sample_loc_type_top_field
bs.SkipUeGolomb(); // chroma_sample_loc_type_bottom_field
}
if (bs.GetBit()) { // timing_info_present_flag
uint32_t num_units_in_tick, time_scale;
num_units_in_tick = bs.GetBits(32); // num_units_in_tick
time_scale = bs.GetBits(32); // time_scale
if (num_units_in_tick > 0)
frame_rate = time_scale / num_units_in_tick;
bs.SkipBit(); // fixed_frame_rate_flag
}
int nal_hrd_parameters_present_flag = bs.GetBit(); // nal_hrd_parameters_present_flag
if (nal_hrd_parameters_present_flag) {
int cpb_cnt_minus1;
cpb_cnt_minus1 = bs.GetUeGolomb(); // cpb_cnt_minus1
bs.SkipBits(4); // bit_rate_scale
bs.SkipBits(4); // cpb_size_scale
for (int i = 0; i < cpb_cnt_minus1; ++i) {
bs.SkipUeGolomb(); // bit_rate_value_minus1[i]
bs.SkipUeGolomb(); // cpb_size_value_minus1[i]
bs.SkipBit(); // cbr_flag[i]
}
bs.SkipBits(5); // initial_cpb_removal_delay_length_minus1
bs.SkipBits(5); // cpb_removal_delay_length_minus1
bs.SkipBits(5); // dpb_output_delay_length_minus1
time_offset_length = bs.GetBits(5); // time_offset_length
}
int vlc_hrd_parameters_present_flag = bs.GetBit(); // vlc_hrd_parameters_present_flag
if (vlc_hrd_parameters_present_flag) {
int cpb_cnt_minus1;
cpb_cnt_minus1 = bs.GetUeGolomb(); // cpb_cnt_minus1
bs.SkipBits(4); // bit_rate_scale
bs.SkipBits(4); // cpb_size_scale
for (int i = 0; i < cpb_cnt_minus1; ++i) {
bs.SkipUeGolomb(); // bit_rate_value_minus1[i]
bs.SkipUeGolomb(); // cpb_size_value_minus1[i]
bs.SkipBit(); // cbr_flag[i]
}
bs.SkipBits(5); // initial_cpb_removal_delay_length_minus1
bs.SkipBits(5); // cpb_removal_delay_length_minus1
bs.SkipBits(5); // dpb_output_delay_length_minus1
time_offset_length = bs.GetBits(5);// time_offset_length
}
cpb_dpb_delays_present_flag = (nal_hrd_parameters_present_flag | vlc_hrd_parameters_present_flag);
if (cpb_dpb_delays_present_flag)
bs.SkipBit(); // low_delay_hrd_flag
pic_struct_present_flag = bs.GetBit(); // pic_struct_present_flag
if (bs.GetBit()) { // bitstream_restriction_flag
bs.SkipBit(); // motion_vectors_over_pic_boundaries_flag
bs.SkipUeGolomb(); // max_bytes_per_pic_denom
bs.SkipUeGolomb(); // max_bits_per_mb_denom
bs.SkipUeGolomb(); // log2_max_mv_length_horizontal
bs.SkipUeGolomb(); // log2_max_mv_length_vertical
bs.SkipUeGolomb(); // num_reorder_frames
bs.SkipUeGolomb(); // max_dec_frame_buffering
}
}
widthM = width;
heightM = height;
aspectRatioM = aspect_ratio;
formatM = format;
scanM = frame_mbs_only_flag ? VIDEO_SCAN_PROGRESSIVE : VIDEO_SCAN_INTERLACED;
frameRateM = frame_rate;
bitRateM = bit_rate;
cpbDpbDelaysPresentFlagM = cpb_dpb_delays_present_flag;
picStructPresentFlagM = pic_struct_present_flag;
frameMbsOnlyFlagM = frame_mbs_only_flag;
mbAdaptiveFrameFieldFlagM = mb_adaptive_frame_field_flag;
timeOffsetLengthM = time_offset_length;
return (bs.Index() / 8);
}
int cFemonH264::parseSEI(const uint8_t *bufP, int lenP)
{
int num_referenced_subseqs, i;
cFemonBitStream bs(bufP, lenP);
eVideoScan scan = scanM;
while ((bs.Index() * 8 + 16) < lenP) { // sei_message
int lastByte, payloadSize = 0, payloadType = 0;
do {
lastByte = bs.GetBits(8) & 0xFF;
payloadType += lastByte;
} while (lastByte == 0xFF); // last_payload_type_byte
do {
lastByte = bs.GetBits(8) & 0xFF;
payloadSize += lastByte;
} while (lastByte == 0xFF); // last_payload_size_byte
switch (payloadType) { // sei_payload
case 1: // pic_timing
if (cpbDpbDelaysPresentFlagM) { // cpb_dpb_delays_present_flag
bs.SkipUeGolomb(); // cpb_removal_delay
bs.SkipUeGolomb(); // dpb_output_delay
}
if (picStructPresentFlagM) { // pic_struct_present_flag
uint32_t pic_struct, ct_type = 0, i = 0;
pic_struct = bs.GetBits(4); // pic_struct
if (pic_struct >= ELEMENTS(seiNumClockTsTableS))
return 0;
if (frameMbsOnlyFlagM && !mbAdaptiveFrameFieldFlagM)
scan = VIDEO_SCAN_PROGRESSIVE;
else {
switch (pic_struct) {
case 0: // frame
case 7: // frame doubling
case 8: // frame tripling
scan = VIDEO_SCAN_PROGRESSIVE;
break;
case 1: // top
case 2: // bottom
case 3: // top bottom
case 4: // bottom top
case 5: // top bottom top
case 6: // bottom top bottom
scan = VIDEO_SCAN_INTERLACED;
break;
default:
scan = VIDEO_SCAN_RESERVED;
break;
}
}
debug2("%s pic_struct=%d scan_type=%d", __PRETTY_FUNCTION__, pic_struct, scan);
for (i = 0; i < seiNumClockTsTableS[pic_struct]; ++i) {
if (bs.GetBit()) { // clock_timestamp_flag[i]
int full_timestamp_flag;
ct_type |= (1 << bs.GetBits(2)); // ct_type
debug2("%s ct_type=%04X", __PRETTY_FUNCTION__, ct_type);
bs.SkipBit(); // nuit_field_based_flag
bs.SkipBits(5); // counting_type
full_timestamp_flag = bs.GetBit(); // full_timestamp_flag
bs.SkipBit(); // discontinuity_flag
bs.SkipBit(); // cnt_dropped_flag
bs.SkipBits(8); // n_frames
if (full_timestamp_flag) {
bs.SkipBits(6); // seconds_value
bs.SkipBits(6); // minutes_value
bs.SkipBits(5); // hours_value
}
else {
if (bs.GetBit()) { // seconds_flag
bs.SkipBits(6); // seconds_value
if (bs.GetBit()) { // minutes_flag
bs.SkipBits(6); // minutes_value
if (bs.GetBit()) // hours_flag
bs.SkipBits(5); // hours_value
}
}
}
if (timeOffsetLengthM > 0)
bs.SkipBits(timeOffsetLengthM); // time_offset
}
}
if (i > 0)
scan = (ct_type & (1 << 1)) ? VIDEO_SCAN_INTERLACED : VIDEO_SCAN_PROGRESSIVE;
}
break;
case 12: // sub_seq_characteristics
bs.SkipUeGolomb(); // sub_seq_layer_num
bs.SkipUeGolomb(); // sub_seq_id
if (bs.GetBit()) // duration_flag
bs.SkipBits(32); // sub_seq_duration
if (bs.GetBit()) { // average_rate_flag
bs.SkipBit(); // accurate_statistics_flag
bs.SkipBits(16); // average_bit_rate (1000 bit/s)
bs.SkipBits(16); // average_frame_rate (frames per 256s)
}
num_referenced_subseqs = bs.GetUeGolomb(); // num_referenced_subseqs
for (i = 0; i < num_referenced_subseqs; ++i) {
bs.SkipUeGolomb(); // ref_sub_seq_layer_num
bs.SkipUeGolomb(); // ref_sub_seq_id
bs.GetBit(); // ref_sub_seq_direction
}
break;
default:
bs.SkipBits(payloadSize * 8);
break;
}
// force byte align
bs.ByteAlign();
}
scanM = scan;
return (bs.Index() / 8);
}
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