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vdr-plugin-femon
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vdr-plugin-femon/femonh264.c

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/*
* Frontend Status Monitor plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* The original NAL SPS parsing and bitstream functions are taken from
* vdr-xineliboutput plugin by Petri Hintukainen.
*/
#include "femontools.h"
#include "femonh264.h"
#define NAL_SEI 0x06 // Supplemental Enhancement Information
#define NAL_SPS 0x07 // Sequence Parameter Set
#define NAL_AUD 0x09 // Access Unit Delimiter
#define NAL_END_SEQ 0x0A // End of Sequence
#define IS_NAL_SEI(buf) (((buf)[0] == 0x00) && ((buf)[1] == 0x00) && ((buf)[2] == 0x01) && ((buf)[3] == NAL_SEI))
#define IS_NAL_SPS(buf) (((buf)[0] == 0x00) && ((buf)[1] == 0x00) && ((buf)[2] == 0x01) && ((buf)[3] == NAL_SPS))
#define IS_NAL_AUD(buf) (((buf)[0] == 0x00) && ((buf)[1] == 0x00) && ((buf)[2] == 0x01) && ((buf)[3] == NAL_AUD))
#define IS_NAL_END_SEQ(buf) (((buf)[0] == 0x00) && ((buf)[1] == 0x00) && ((buf)[2] == 0x01) && ((buf)[3] == NAL_END_SEQ))
// Picture types
#define NO_PICTURE 0
#define I_FRAME 1
#define P_FRAME 2
#define B_FRAME 3
static const eVideoAspectRatio aspect_ratios[] =
{
VIDEO_ASPECT_RATIO_INVALID,
VIDEO_ASPECT_RATIO_1_1,
VIDEO_ASPECT_RATIO_12_11,
VIDEO_ASPECT_RATIO_10_11,
VIDEO_ASPECT_RATIO_16_11,
VIDEO_ASPECT_RATIO_40_33,
VIDEO_ASPECT_RATIO_24_11,
VIDEO_ASPECT_RATIO_20_11,
VIDEO_ASPECT_RATIO_32_11,
VIDEO_ASPECT_RATIO_80_33,
VIDEO_ASPECT_RATIO_18_11,
VIDEO_ASPECT_RATIO_15_11,
VIDEO_ASPECT_RATIO_64_33,
VIDEO_ASPECT_RATIO_160_99,
VIDEO_ASPECT_RATIO_4_3,
VIDEO_ASPECT_RATIO_3_2,
VIDEO_ASPECT_RATIO_2_1
};
static const eVideoFormat video_formats[] =
{
VIDEO_FORMAT_COMPONENT,
VIDEO_FORMAT_PAL,
VIDEO_FORMAT_NTSC,
VIDEO_FORMAT_SECAM,
VIDEO_FORMAT_MAC,
VIDEO_FORMAT_UNKNOWN,
VIDEO_FORMAT_RESERVED
};
typedef struct {
int width;
int height;
eVideoAspectRatio aspect_ratio;
eVideoFormat format;
} h264_sps_data_t;
typedef struct {
double frame_rate;
double bitrate;
eVideoScan scan;
} h264_sei_data_t;
typedef struct {
const uint8_t *data;
int count; // bits
int index; // bits
} br_state;
#define BR_INIT(data, bytes) { (data), 8 * (bytes), 0 }
#define BR_EOF(br) ((br)->index >= (br)->count)
#define br_skip_bit(br) br_skip_bits(br,1)
#define br_get_u8(br) br_get_bits(br, 8)
#define br_get_u16(br) ((br_get_bits(br, 8) << 8) | br_get_bits(br, 8))
#define br_skip_ue_golomb(br) br_skip_golomb(br)
#define br_skip_se_golomb(br) br_skip_golomb(br)
static inline void br_init(br_state *br, const uint8_t *data, int bytes)
{
br->data = data;
br->count = 8 * bytes;
br->index = 0;
}
static inline int br_get_bit(br_state *br)
{
if (br->index >= br->count)
return 1; // -> no infinite colomb's ...
int r = (br->data[br->index >> 3] >> (7 - (br->index & 7))) & 1;
br->index++;
return r;
}
static inline uint32_t br_get_bits(br_state *br, uint32_t n)
{
uint32_t r = 0;
while (n--)
r = r | (br_get_bit(br) << n);
return r;
}
static inline void br_skip_bits(br_state *br, int n)
{
br->index += n;
}
static inline uint32_t br_get_ue_golomb(br_state *br)
{
int n = 0;
while (!br_get_bit(br) && (n < 32))
n++;
return n ? ((1 << n) - 1) + br_get_bits(br, n) : 0;
}
static inline int32_t br_get_se_golomb(br_state *br)
{
uint32_t r = br_get_ue_golomb(br) + 1;
return (r & 1) ? -(r >> 1) : (r >> 1);
}
static inline void br_skip_golomb(br_state *br)
{
int n = 0;
while (!br_get_bit(br) && (n < 32))
n++;
br_skip_bits(br, n);
}
static inline void br_byte_align(br_state *br)
{
int n = br->index % 8;
if (n > 0)
br_skip_bits(br, 8 - n);
}
static bool h264_parse_sps(const uint8_t *buf, int len, h264_sps_data_t *sps)
{
br_state br = BR_INIT(buf, len);
int profile_idc, pic_order_cnt_type;
int frame_mbs_only;
int i, j;
profile_idc = br_get_u8(&br);
//Dprintf("H.264 SPS: profile_idc %d", profile_idc);
br_skip_bits(&br, 16);
br_skip_ue_golomb(&br); // seq_parameter_set_id
if (profile_idc >= 100) {
if (br_get_ue_golomb(&br) == 3) // chroma_format_idc
br_skip_bit(&br); // residual_colour_transform_flag
br_skip_ue_golomb(&br); // bit_depth_luma - 8
br_skip_ue_golomb(&br); // bit_depth_chroma - 8
br_skip_bit(&br); // transform_bypass
if (br_get_bit(&br)) { // seq_scaling_matrix_present
for (i = 0; i < 8; i++) {
if (br_get_bit(&br)) { // seq_scaling_list_present
int last = 8, next = 8, size = (i < 6) ? 16 : 64;
for (j = 0; j < size; j++) {
if (next)
next = (last + br_get_se_golomb(&br)) & 0xff;
last = next ?: last;
}
}
}
}
}
br_skip_ue_golomb(&br); // log2_max_frame_num - 4
pic_order_cnt_type = br_get_ue_golomb(&br);
if (pic_order_cnt_type == 0)
br_skip_ue_golomb(&br); // log2_max_poc_lsb - 4
else if (pic_order_cnt_type == 1) {
br_skip_bit(&br); // delta_pic_order_always_zero
br_skip_se_golomb(&br); // offset_for_non_ref_pic
br_skip_se_golomb(&br); // offset_for_top_to_bottom_field
j = br_get_ue_golomb(&br); // num_ref_frames_in_pic_order_cnt_cycle
for (i = 0; i < j; i++)
br_skip_se_golomb(&br); // offset_for_ref_frame[i]
}
br_skip_ue_golomb(&br); // ref_frames
br_skip_bit(&br); // gaps_in_frame_num_allowed
sps->width = br_get_ue_golomb(&br) + 1; // mbs
sps->height = br_get_ue_golomb(&br) + 1; // mbs
frame_mbs_only = br_get_bit(&br);
//Dprintf("H.264 SPS: pic_width: %u mbs", (unsigned int)sps->width);
//Dprintf("H.264 SPS: pic_height: %u mbs", (unsigned int)sps->height);
//Dprintf("H.264 SPS: frame only flag: %d", frame_mbs_only);
sps->width *= 16;
sps->height *= 16 * (2 - frame_mbs_only);
if (!frame_mbs_only) {
if (br_get_bit(&br)) { // mb_adaptive_frame_field_flag
//Dprintf("H.264 SPS: MBAFF");
}
}
br_skip_bit(&br); // direct_8x8_inference_flag
if (br_get_bit(&br)) { // frame_cropping_flag
uint32_t crop_left = br_get_ue_golomb(&br);
uint32_t crop_right = br_get_ue_golomb(&br);
uint32_t crop_top = br_get_ue_golomb(&br);
uint32_t crop_bottom = br_get_ue_golomb(&br);
//Dprintf("H.264 SPS: cropping %d %d %d %d", crop_left, crop_top, crop_right, crop_bottom);
sps->width -= 2 * (crop_left + crop_right);
if (frame_mbs_only)
sps->height -= 2 * (crop_top + crop_bottom);
else
sps->height -= 4 * (crop_top + crop_bottom);
}
// VUI parameters
sps->aspect_ratio = VIDEO_ASPECT_RATIO_INVALID;
sps->format = VIDEO_FORMAT_INVALID;
if (br_get_bit(&br)) { // vui_parameters_present_flag
if (br_get_bit(&br)) { // aspect_ratio_info_present
uint32_t aspect_ratio_idc = br_get_u8(&br);
//Dprintf("H.264 SPS: aspect_ratio_idc %d", aspect_ratio_idc);
if (aspect_ratio_idc == 255) { // extended sar
br_skip_bit(&br); // sar_width
br_skip_bit(&br); // sar_height
sps->aspect_ratio = VIDEO_ASPECT_RATIO_EXTENDED;
//Dprintf("H.264 SPS: aspect ratio extended");
}
else if (aspect_ratio_idc < sizeof(aspect_ratios) / sizeof(aspect_ratios[0])) {
sps->aspect_ratio = aspect_ratios[aspect_ratio_idc];
//Dprintf("H.264 SPS: -> aspect ratio %d", sps->aspect_ratio);
}
}
if (br_get_bit(&br)) // overscan_info_present_flag
br_skip_bit(&br); // overscan_approriate_flag
if (br_get_bit(&br)) { // video_signal_type_present_flag
uint32_t video_format = br_get_bits(&br, 3);
if (video_format < sizeof(video_formats) / sizeof(video_formats[0])) {
sps->format = video_formats[video_format];
//Dprintf("H.264 SPS: -> video format %d", sps->format);
}
}
}
//Dprintf("H.264 SPS: -> video size %dx%d, aspect %d", sps->width, sps->height, sps->aspect_ratio);
if (BR_EOF(&br)) {
//Dprintf("H.264 SPS: not enough data ?");
return false;
}
return true;
}
static bool h264_parse_sei(const uint8_t *buf, int len, h264_sei_data_t *sei)
{
int num_referenced_subseqs, i;
br_state br = BR_INIT(buf, len);
while (!BR_EOF(&br)) { // sei_message
int lastByte, payloadSize = 0, payloadType = 0;
// last_payload_type_byte
do {
lastByte = br_get_u8(&br) & 0xFF;
payloadType += lastByte;
} while (lastByte == 0xFF);
// last_payload_size_byte
do {
lastByte = br_get_u8(&br) & 0xFF;
payloadSize += lastByte;
} while (lastByte == 0xFF);
switch (payloadType) { // sei_payload
//case 1: // pic_timing
// ...
// switch (br_get_bits(&br, 2)) { // ct_type
// case 0:
// sei->scan = VIDEO_SCAN_PROGRESSIVE;
// break;
// case 1:
// sei->scan = VIDEO_SCAN_INTERLACED;
// break;
// case 2:
// sei->scan = VIDEO_SCAN_UNKNOWN;
// break;
// default:
// sei->scan = VIDEO_SCAN_RESERVED;
// break;
// }
// break;
case 12: // sub_seq_characteristics
br_skip_ue_golomb(&br); // sub_seq_layer_num
br_skip_ue_golomb(&br); // sub_seq_id
if (br_get_bit(&br)) // duration_flag
br_skip_bits(&br, 32); // sub_seq_duration
if (br_get_bit(&br)) { // average_rate_flag
br_skip_bit(&br); // accurate_statistics_flag
sei->bitrate = br_get_u16(&br); // average_bit_rate
sei->frame_rate = br_get_u16(&br); // average_frame_rate
//Dprintf("H.264 SEI: -> stream bitrate %.1f, frame rate %.1f", sei->bitrate, sei->frame_rate);
}
num_referenced_subseqs = br_get_ue_golomb(&br); // num_referenced_subseqs
for (i = 0; i < num_referenced_subseqs; ++i) {
br_skip_ue_golomb(&br); // ref_sub_seq_layer_num
br_skip_ue_golomb(&br); // ref_sub_seq_id
br_get_bit(&br); // ref_sub_seq_direction
}
break;
default:
br_skip_bits(&br, payloadSize);
break;
}
// force byte align
br_byte_align(&br);
}
return true;
}
static int h264_nal_unescape(uint8_t *dst, const uint8_t *src, int len)
{
int s = 0, d = 0;
while (s < len) {
if (!src[s] && !src[s + 1]) {
// hit 00 00 xx
dst[d] = dst[d + 1] = 0;
s += 2;
d += 2;
if (src[s] == 3) {
s++; // 00 00 03 xx --> 00 00 xx
if (s >= len)
return d;
}
}
dst[d++] = src[s++];
}
return d;
}
static int h264_get_picture_type(const uint8_t *buf, int len)
{
for (int i = 0; i < (len - 5); ++i) {
if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1 && buf[i + 3] == NAL_AUD) {
uint8_t type = (uint8_t)(buf[i + 4] >> 5);
switch (type) {
case 0: case 3: case 5: return I_FRAME;
case 1: case 4: case 6: return P_FRAME;
case 2: case 7: return B_FRAME;
default:;
}
}
}
return NO_PICTURE;
}
bool getH264VideoInfo(uint8_t *buf, int len, video_info_t *info)
{
bool sps_found = false, sei_found = true; // sei currently disabled
// H.264 detection, search for NAL AUD
if (!IS_NAL_AUD(buf))
return false;
// If I-frame, search for NAL SPS
if (h264_get_picture_type(buf, len) != I_FRAME)
return false;
info->codec = VIDEO_CODEC_H264;
// Scan video packet ...
for (int i = 5; i < len - 4; i++) {
// ... for sequence parameter set
if (!sps_found && (buf[i] == 0x00) && (buf[i + 1] == 0x00) && (buf[i + 2] == 0x01) && (buf[i + 3] & 0x1f) == NAL_SPS) {
uint8_t nal_data[len];
int nal_len;
//Dprintf("H.264: Found NAL SPS at offset %d/%d", i, len);
if (0 < (nal_len = h264_nal_unescape(nal_data, buf + i + 4, len - i - 4))) {
h264_sps_data_t sps = { 0, 0, VIDEO_ASPECT_RATIO_INVALID, VIDEO_FORMAT_INVALID };
if (h264_parse_sps(nal_data, nal_len, &sps)) {
info->format = sps.format;
info->width = sps.width;
info->height = sps.height;
info->aspectRatio = sps.aspect_ratio;
sps_found = true;
}
}
}
// ... for supplemental enhancement information
if (!sei_found && (buf[i] == 0x00) && (buf[i + 1] == 0x00) && (buf[i + 2] == 0x01) && (buf[i + 3] & 0x1f) == NAL_SEI) {
uint8_t nal_data[len];
int nal_len;
//Dprintf("H.264: Found NAL SEI at offset %d/%d", i, len);
if (0 < (nal_len = h264_nal_unescape(nal_data, buf + i + 4, len - i - 4))) {
h264_sei_data_t sei = { 0, 0, VIDEO_SCAN_INVALID };
if (h264_parse_sei(nal_data, nal_len, &sei)) {
info->frameRate = sei.frame_rate;
info->bitrate = sei.bitrate;
info->scan = sei.scan;
sei_found = true;
}
}
}
if (sps_found && sei_found)
break;
}
return true;
}
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