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hls.c
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hls.c
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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#include <pthread.h>
#include <time.h>
#ifndef _MSC_VER
#if !defined(__APPLE__) && !defined(__MINGW32__) && !defined(__CYGWIN__)
#include <sys/prctl.h>
#endif
#include <unistd.h>
#else
#include <Windows.h>
#define sleep Sleep
#endif
#include <inttypes.h>
#include "curl.h"
#include "hls.h"
#include "msg.h"
#include "misc.h"
#include "aes.h"
#include "mpegts.h"
static uint64_t get_duration_ms(const char *ptr)
{
uint64_t v1 = 0;
uint64_t v2 = 0;
uint32_t n = 0;
bool hasDot = false;
while (*ptr == ' ' || *ptr == '\t' ) ++ptr;
while (*ptr != '\0') {
if (*ptr >= '0' && *ptr <= '9') {
uint32_t digit = (uint32_t)((*ptr) - '0');
if (!hasDot)
v1 = v1 * 10 + digit;
else if (n < 3) {
++n;
v2 = v2 * 10 + digit;
}
else
break;
}
else if (*ptr == '.' && !hasDot) {
hasDot = true;
}
else
break;
++ptr;
}
if (v2 > 0)
while (n < 3) {
++n;
v2 *= 10;
}
return v1 * 1000 + v2;
}
static void set_hls_http_header(void *session)
{
if (hls_args.user_agent) {
set_user_agent_http_session(session, hls_args.user_agent);
}
if (hls_args.proxy_uri) {
set_proxy_uri_http_session(session, hls_args.proxy_uri);
}
if (hls_args.cookie_file) {
set_cookie_file_session(session, hls_args.cookie_file, hls_args.cookie_file_mutex);
}
for (int i=0; i<HLSDL_MAX_NUM_OF_CUSTOM_HEADERS; ++i) {
if (hls_args.custom_headers[i]) {
add_custom_header_http_session(session, hls_args.custom_headers[i]);
}
else {
break;
}
}
}
static void * init_hls_session(void)
{
void *session = init_http_session();
assert(session);
set_hls_http_header(session);
return session;
}
long get_hls_data_from_url(char *url, char **out, size_t *size, int type, char **new_url)
{
void *session = init_hls_session();
long http_code = get_data_from_url_with_session(&session, url, out, size, type, new_url, -1, -1);
clean_http_session(session);
return http_code;
}
int is_playlist_FPS(char* source)
{
return strstr(source, "KEYFORMAT=\"com.apple.streamingkeydelivery\"") ||
strstr(source, "urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed") ||
strstr(source, "com.microsoft.playready");
}
int get_playlist_type(char *source)
{
if (strncmp("#EXTM3U", source, 7) != 0) {
MSG_WARNING("Not a valid M3U8 file. Exiting.\n");
return -1;
}
if (strstr(source, "#EXT-X-STREAM-INF")) {
return MASTER_PLAYLIST;
}
if (!hls_args.force_ignoredrm && is_playlist_FPS(source)) {
MSG_WARNING("HLS stream is DRM protected. Exiting\n");
return -1;
}
return MEDIA_PLAYLIST;
}
/*
* In response to
* http://stackoverflow.com/questions/1634359/is-there-a-reverse-fn-for-strstr
*
* Basically, strstr but return last occurence, not first.
*
* This file contains several implementations and a harness to test and
* benchmark them.
*
* Some of the implementations of the actual function are copied from
* elsewhere; they are commented with the location. The rest of the coe
* was written by Lars Wirzenius (liw@liw.fi) and is hereby released into
* the public domain. No warranty. If it turns out to be broken, you get
* to keep the pieces.
*/
/* By liw. */
static char* last_strstr(const char* haystack, const char* needle)
{
if (*needle == '\0')
return (char*)haystack;
char* result = NULL;
for (;;) {
char* p = strstr(haystack, needle);
if (p == NULL)
break;
result = p;
haystack = p + 1;
}
return result;
}
static int extend_url(char **url, const char *baseurl)
{
static const char proxy_marker[] = "englandproxy.co.uk"; // ugly workaround to be fixed
static const char proxy_url[] = "http://www.englandproxy.co.uk/";
size_t max_length = strlen(*url) + strlen(baseurl) + 10;
if (!strncmp(*url, "http://", 7) || !strncmp(*url, "https://", 8)) {
if (strstr(baseurl, proxy_marker) && !strstr(*url, proxy_marker)) {
max_length = strlen(*url) + strlen(proxy_url);
char *buffer = malloc(max_length);
snprintf(buffer, max_length, "%s%s", proxy_url, strstr(*url, "://") + 3);
*url = realloc(*url, strlen(buffer) + 1);
strcpy(*url, buffer);
free(buffer);
}
return 0;
}
else if (**url == '/') {
char *domain = malloc(max_length);
strcpy(domain, baseurl);
char proto[6];
if( 2 == sscanf(baseurl, "%5[^:]://%[^/]", proto, domain))
{
char *buffer = malloc(max_length);
if ( (*url)[1] == '/') // url start with "//"
{
snprintf(buffer, max_length, "%s:%s", proto, *url);
}
else
{
snprintf(buffer, max_length, "%s://%s%s", proto, domain, *url);
}
*url = realloc(*url, strlen(buffer) + 1);
strcpy(*url, buffer);
free(buffer);
}
free(domain);
return 0;
}
else if (strstr(baseurl, "://")) {
// URLs can have '?'. To make /../ work, remove it.
char *domain = strdup(baseurl);
char *find_questionmark = strchr(domain, '?');
if (find_questionmark) {
*find_questionmark = '\0';
}
char *buffer = malloc(max_length);
snprintf(buffer, max_length, "%s/../%s", domain, *url);
*url = realloc(*url, strlen(buffer) + 1);
strcpy(*url, buffer);
free(buffer);
free(domain);
return 0;
}
else {
// Assume local URL
char* folder = strdup(baseurl);
char* separator = "/";
char* find_folder = last_strstr(folder, separator);
if (find_folder) {
*find_folder = '\0';
} else {
separator = "\\";
find_folder = last_strstr(folder, separator);
if (find_folder)
*find_folder = '\0';
}
if (find_folder) {
char* buffer = malloc(max_length);
snprintf(buffer, max_length, "%s%s%s", folder, separator, *url);
*url = realloc(*url, strlen(buffer) + 1);
strcpy(*url, buffer);
free(buffer);
}
free(folder);
return 0;
}
}
static int parse_tag(hls_media_playlist_t *me, struct hls_media_segment *ms, char *tag, int64_t *seg_offset, int64_t *seg_size)
{
int enc_type;
if (!strncmp(tag, "#EXT-X-KEY:METHOD=AES-128", 25)) {
enc_type = ENC_AES128;
me->enc_aes.iv_is_static = false;
} else if (!strncmp(tag, "#EXT-X-KEY:METHOD=SAMPLE-AES-CTR", 32)) {
enc_type = ENC_AES_SAMPLE_CTR;
me->enc_aes.iv_is_static = is_playlist_FPS(me->source);
} else if (!strncmp(tag, "#EXT-X-KEY:METHOD=SAMPLE-AES", 28)) {
enc_type = ENC_AES_SAMPLE;
me->enc_aes.iv_is_static = is_playlist_FPS(me->source);
} else {
if (!strncmp(tag, "#EXTINF:", 8)){
ms->duration_ms = get_duration_ms(tag+8);
return 0;
} else if (!strncmp(tag, "#EXT-X-ENDLIST", 14)){
me->is_endlist = true;
return 0;
} else if (!strncmp(tag, "#EXT-X-MEDIA-SEQUENCE:", 22)){
if(sscanf(tag+22, "%d", &(me->first_media_sequence)) == 1){
return 0;
}
} else if (!strncmp(tag, "#EXT-X-TARGETDURATION:", 22)){
me->target_duration_ms = get_duration_ms(tag+22);
return 0;
} else if (!strncmp(tag, "#EXT-X-BYTERANGE:", 17)) {
*seg_size = strtoll(tag+17, NULL, 10);
tag = strchr(tag+17, '@');
if (tag) {
*seg_offset = strtoll(tag+1, NULL, 10);
}
return 0;
}
return 1;
}
me->encryption = true;
me->encryptiontype = enc_type;
char *link_to_key = malloc(strlen(tag) + strlen(me->url) + 10);
char iv_str[STRLEN_BTS(KEYLEN)] = "\0";
char sep = '\0';
if ((sscanf(tag, "#EXT-X-KEY:METHOD=AES-128,URI=\"%[^\"]\",IV=0%c%32[0-9a-f]", link_to_key, &sep, iv_str) > 0 ||
sscanf(tag, "#EXT-X-KEY:METHOD=SAMPLE-AES,URI=\"%[^\"]\",IV=0%c%32[0-9a-f]", link_to_key, &sep, iv_str) > 0))
{
if (sep == 'x' || sep == 'X')
{
uint8_t *iv_bin = malloc(KEYLEN);
str_to_bin(iv_bin, iv_str, KEYLEN);
memcpy(me->enc_aes.iv_value, iv_bin, KEYLEN);
me->enc_aes.iv_is_static = true;
free(iv_bin);
}
extend_url(&link_to_key, me->url);
free(me->enc_aes.key_url);
me->enc_aes.key_url = strdup(link_to_key);
}
free(link_to_key);
return 0;
}
static int media_playlist_get_links(hls_media_playlist_t *me)
{
struct hls_media_segment *ms = NULL;
struct hls_media_segment *curr_ms = NULL;
char *src = me->source;
int64_t seg_offset = 0;
int64_t seg_size = -1;
MSG_PRINT("> START media_playlist_get_links\n");
int i = 0;
while(src != NULL){
if (ms == NULL)
{
ms = malloc(sizeof(struct hls_media_segment));
memset(ms, 0x00, sizeof(struct hls_media_segment));
}
while ((src = (strchr(src, '\n')))) {
src++;
if (*src == '\n') {
continue;
}
if (*src == '\r') {
continue;
}
if (*src == '#') {
parse_tag(me, ms, src, &seg_offset, &seg_size);
continue;
}
if (*src == '\0') {
goto finish;
}
char *end_ptr = strchr(src, '\n');
char *end_ptr2 = strchr(src, '\r');
if (end_ptr2 && end_ptr2 < end_ptr)
end_ptr = end_ptr2;
if (end_ptr != NULL) {
int url_size = (int)(end_ptr - src) + 1;
ms->url = malloc(url_size);
strncpy(ms->url, src, url_size-1);
ms->url[url_size-1] = '\0';
ms->sequence_number = i + me->first_media_sequence;
if (me->encryptiontype == ENC_AES128 || me->encryptiontype == ENC_AES_SAMPLE) {
memcpy(ms->enc_aes.key_value, me->enc_aes.key_value, KEYLEN);
memcpy(ms->enc_aes.iv_value, me->enc_aes.iv_value, KEYLEN);
ms->enc_aes.key_url = strdup(me->enc_aes.key_url);
if (me->enc_aes.iv_is_static == false) {
char iv_str[STRLEN_BTS(KEYLEN)];
snprintf(iv_str, STRLEN_BTS(KEYLEN), "%032x\n", ms->sequence_number);
uint8_t *iv_bin = malloc(KEYLEN);
str_to_bin(iv_bin, iv_str, KEYLEN);
memcpy(ms->enc_aes.iv_value, iv_bin, KEYLEN);
free(iv_bin);
}
}
/* Get full url */
extend_url(&(ms->url), me->url);
ms->size = seg_size;
if (seg_size >= 0) {
ms->offset = seg_offset;
seg_offset += seg_size;
seg_size = -1;
} else {
ms->offset = 0;
seg_offset = 0;
}
/* Add new segment to segment list */
if (me->first_media_segment == NULL)
{
me->first_media_segment = ms;
curr_ms = ms;
}
else
{
curr_ms->next = ms;
ms->prev = curr_ms;
curr_ms = ms;
}
ms = NULL;
i += 1;
break;
}
}
}
finish:
me->last_media_segment = curr_ms;
if (i > 0) {
me->last_media_sequence = me->first_media_sequence + i - 1;
}
media_segment_cleanup(ms);
MSG_PRINT("> END media_playlist_get_links\n");
return 0;
}
static uint64_t get_duration_hls_media_playlist(hls_media_playlist_t *me)
{
uint64_t duration_ms = 0;
struct hls_media_segment *ms = me->first_media_segment;
while(ms) {
duration_ms += ms->duration_ms;
ms = ms->next;
}
return duration_ms;
}
int handle_hls_media_playlist(hls_media_playlist_t *me)
{
me->encryption = false;
me->encryptiontype = ENC_NONE;
if (!me->source) {
size_t size = 0;
long http_code = 0;
int tries = hls_args.open_max_retries;
while (tries) {
http_code = get_hls_data_from_url(me->orig_url, &me->source, &size, STRING, &me->url);
if (200 != http_code || size == 0) {
MSG_ERROR("%s %d tries[%d]\n", me->orig_url, (int)http_code, (int)tries);
--tries;
sleep(1);
continue;
}
break;
}
}
me->first_media_segment = NULL;
me->last_media_segment = NULL;
me->target_duration_ms = 0;
me->is_endlist = false;
me->last_media_sequence = 0;
if (media_playlist_get_links(me)) {
MSG_ERROR("Could not parse links. Exiting.\n");
return 1;
}
me->total_duration_ms = get_duration_hls_media_playlist(me);
return 0;
}
static bool get_next_attrib(char **source, char **tag, char **val)
{
bool ret = false;
char *ptr = NULL;
char *token = NULL;
char *value = NULL;
char end_val_marker = '\0';
char *src = *source;
while (*src != '\0' && strchr(", \t\n\r", *src)) {
++src;
continue;
}
ptr = src;
while (*ptr != '=' && *ptr != '\0' && !strchr("\n\r", *ptr)) ++ptr;
if (*ptr != '\0') {
token = src;
*ptr = '\0';
ptr += 1;
if (*ptr == '"') {
++ptr;
end_val_marker = '"';
} else {
end_val_marker = ',';
}
value = ptr;
while (*ptr != end_val_marker && *ptr != '\0' && !strchr("\n\r", *ptr)) ++ptr;
src = ptr;
if (*ptr) {
++src;
*ptr = '\0';
}
if (*value) {
*val = value;
*tag = token;
ret = true;
}
*source = src;
} else {
*source = ptr;
}
return ret;
}
int handle_hls_master_playlist(struct hls_master_playlist *ma)
{
bool url_expected = false;
unsigned int bitrate = 0;
char *res = NULL;
char *codecs = NULL;
char *audio_grp = NULL;
char *token = NULL;
char *value = NULL;
char *src = ma->source;
while(*src != '\0'){
char *end_ptr = strchr(src, '\n');
if (!end_ptr) {
goto finish;
}
*end_ptr = '\0';
if (*src == '#') {
url_expected = false;
bitrate = 0;
res = NULL;
codecs = NULL;
audio_grp = NULL;
if (!strncmp(src, "#EXT-X-STREAM-INF:", 18)) {
src += 18;
while (get_next_attrib(&src, &token, &value)) {
if (!strncmp(token, "BANDWIDTH", 9)) {
sscanf(value, "%u", &bitrate);
} else if (!strncmp(token, "AUDIO", 5)) {
audio_grp = value;
} else if (!strncmp(token, "RESOLUTION", 10)) {
res = value;
} else if (!strncmp(token, "CODECS", 6)) {
codecs = value;
}
}
url_expected = true;
} else if (!strncmp(src, "#EXT-X-MEDIA:TYPE=AUDIO,", 24)) {
src += 24;
char *grp_id = NULL;
char *name = NULL;
char *lang = NULL;
char *url = NULL;
bool is_default = false;
while (get_next_attrib(&src, &token, &value)) {
if (!strncmp(token, "GROUP-ID", 8)) {
grp_id = value;
} else if (!strncmp(token, "NAME", 4)) {
name = value;
} else if (!strncmp(token, "LANGUAGE", 8)) {
lang = value;
} else if (!strncmp(token, "URI", 3)) {
url = value;
} else if (!strncmp(token, "DEFAULT", 7)) {
if (!strncmp(value, "YES", 3)) {
is_default = true;
}
}
}
if (grp_id && name && url) {
size_t len = strlen(url);
hls_audio_t *audio = malloc(sizeof(hls_audio_t));
memset(audio, 0x00, sizeof(hls_audio_t));
audio->url = malloc(len + 1);
memcpy(audio->url, url, len);
audio->url[len] = '\0';
extend_url(&(audio->url), ma->url);
audio->grp_id = strdup(grp_id);
audio->name = strdup(name);
audio->lang = lang ? strdup(lang) : NULL;
audio->is_default = is_default;
if (ma->audio) {
audio->next = ma->audio;
}
ma->audio = audio;
}
}
} else if (url_expected) {
size_t len = strlen(src);
// here we will fill new playlist
hls_media_playlist_t *me = malloc(sizeof(hls_media_playlist_t));
memset(me, 0x00, sizeof(hls_media_playlist_t));
me->url = malloc(len + 1);
memcpy(me->url, src, len);
me->url[len] = '\0';
extend_url(&(me->url), ma->url);
me->bitrate = bitrate;
me->audio_grp = audio_grp ? strdup(audio_grp) : NULL;
me->resolution = res ? strdup(res) : strdup("unknown");
me->codecs = codecs ? strdup(codecs) : strdup("unknown");
if (ma->media_playlist) {
me->next = ma->media_playlist;
}
ma->media_playlist = me;
url_expected = false;
}
src = end_ptr + 1;
}
finish:
return 0;
}
static int sample_aes_append_av_data(ByteBuffer_t *out, ByteBuffer_t *in, const uint8_t *pcr, uint16_t pid, uint8_t *cont_count)
{
uint8_t *av_data = in->data;
uint32_t av_size = in->pos;
uint8_t ts_header[4] = {TS_SYNC_BYTE, 0x40, 0x00, 0x10};
ts_header[1] = ((pid >> 8) & 0x1F) | 0x40; // 0x40 - set payload_unit_start_indicator
ts_header[2] = pid & 0xFF;
uint8_t adapt_header[8] = {0x00};
uint8_t adapt_header_size = 0;
uint32_t payload_size = TS_PACKET_LENGTH - sizeof(ts_header);
if (pcr[0] & 0x10) {
adapt_header_size = 8;
adapt_header[1] = pcr[0] & 0xF0; // set previus flags: discontinuity_indicator, random_access_indicator, elementary_stream_priority_indicator, PCR_flag
memcpy(adapt_header + 2, pcr + 1, 6);
} else if (pcr[0] & 0x20) {
adapt_header_size = 2;
adapt_header[1] = pcr[0] & 0xF0; // restore flags as described above
} else if (av_size < payload_size) {
adapt_header_size = payload_size - av_size == 1 ? 1 : 2;
}
payload_size -= adapt_header_size;
if (adapt_header_size) {
adapt_header[0] = adapt_header_size - 1; // size without field size
if (av_size < payload_size) {
adapt_header[0] += payload_size - av_size;
}
if (adapt_header[0]) {
ts_header[3] = (ts_header[3] & 0xcf) | 0x30; // set addaptation filed flag
}
}
// ts header
ts_header[3] = (ts_header[3] & 0xf0) | (*cont_count);
*cont_count = (*cont_count + 1) % 16;
memcpy(&out->data[out->pos], ts_header, sizeof(ts_header));
out->pos += sizeof(ts_header);
// adaptation field
if (adapt_header_size) {
memcpy(&out->data[out->pos], adapt_header, adapt_header_size);
out->pos += adapt_header_size;
}
if (av_size < payload_size) {
uint32_t s;
for(s=0; s < payload_size - av_size; ++s) {
out->data[out->pos + s] = 0xff;
}
out->pos += payload_size - av_size;
payload_size = av_size;
}
memcpy(&out->data[out->pos], av_data, payload_size);
out->pos += payload_size;
av_data += payload_size;
av_size -= payload_size;
if (av_size > 0) {
uint32_t packets_num = av_size / (TS_PACKET_LENGTH - 4);
uint32_t p;
ts_header[1] &= 0xBF; // unset payload_unit_start_indicator
ts_header[3] = (ts_header[3] & 0xcf) | 0x10; // unset addaptation filed flag
for (p=0; p < packets_num; ++p) {
ts_header[3] = (ts_header[3] & 0xf0) | (*cont_count);
*cont_count = (*cont_count + 1) % 16;
memcpy(&out->data[out->pos], ts_header, sizeof(ts_header));
memcpy(&out->data[out->pos+4], av_data, TS_PACKET_LENGTH - sizeof(ts_header));
out->pos += TS_PACKET_LENGTH;
av_data += TS_PACKET_LENGTH - sizeof(ts_header);
av_size -= TS_PACKET_LENGTH - sizeof(ts_header);
}
ts_header[3] = (ts_header[3] & 0xcf) | 0x30; // set addaptation filed flag to add aligment
adapt_header[1] = 0; // none flags set, only for alignment
if (av_size > 0) {
ts_header[3] = (ts_header[3] & 0xf0) | (*cont_count);
*cont_count = (*cont_count + 1) % 16;
// add ts_header
memcpy(&out->data[out->pos], ts_header, sizeof(ts_header));
// add adapt header
adapt_header_size = TS_PACKET_LENGTH - 4 - av_size == 1 ? 1 : 2;
adapt_header[0] = adapt_header_size - 1; // size without field size
if (adapt_header[0]) {
adapt_header[0] += TS_PACKET_LENGTH - 4 - 2 - av_size;
}
memcpy(&out->data[out->pos+4], adapt_header, adapt_header_size);
out->pos += 4 + adapt_header_size;
// add alignment
if (adapt_header[0]) {
int32_t s;
for(s=0; s < adapt_header[0] - 1; ++s) {
out->data[out->pos + s] = 0xff;
}
out->pos += adapt_header[0] -1;
}
// add payload
memcpy(out->data + out->pos, av_data, av_size);
out->pos += av_size;
av_data += av_size;
av_size -= av_size;
}
}
return 0;
}
static uint8_t * remove_emulation_prev(const uint8_t *src,
const uint8_t *src_end,
uint8_t *dst,
uint8_t *dst_end)
{
while (src + 2 < src_end)
if (!*src && !*(src + 1) && *(src + 2) == 3) {
*dst++ = *src++;
*dst++ = *src++;
src++; // remove emulation_prevention_three_byte
} else
*dst++ = *src++;
while (src < src_end)
*dst++ = *src++;
return dst;
}
static int insert_emulation_prev( const uint8_t *src,
const uint8_t *src_end,
uint8_t *dst,
uint8_t *dst_end)
{
int bytes_inserted = 0;
while (src + 2 < src_end && dst + 3 < dst_end)
if (!*src && !*(src + 1) && *(src + 2) < 3) {
*dst++ = *src++;
*dst++ = *src++;
*dst++ = 3; // insert emulation_prevention_three_byte
*dst++ = *src++;
bytes_inserted++;
}
else {
*dst++ = *src++;
}
while (src < src_end)
*dst++ = *src++;
return bytes_inserted;
}
static uint8_t *ff_avc_find_startcode_internal(uint8_t *p, uint8_t *end)
{
uint8_t *a = p + 4 - ((intptr_t)p & 3);
for (end -= 3; p < a && p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
for (end -= 3; p < end; p += 4) {
uint32_t x = *(uint32_t*)p;
if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
if (p[1] == 0) {
if (p[0] == 0 && p[2] == 1)
return p;
if (p[2] == 0 && p[3] == 1)
return p+1;
}
if (p[3] == 0) {
if (p[2] == 0 && p[4] == 1)
return p+2;
if (p[4] == 0 && p[5] == 1)
return p+3;
}
}
}
for (end += 3; p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
return end + 3;
}
static uint8_t *ff_avc_find_startcode(uint8_t *p, uint8_t *end){
uint8_t *out= ff_avc_find_startcode_internal(p, end);
if(p<out && out<end && !out[-1]) out--;
return out;
}
static int sample_aes_decrypt_nal_units(hls_media_segment_t *s, uint8_t *buf_in, int size)
{
uint8_t *end = buf_in + size;
uint8_t *nal_start;
uint8_t *nal_end;
uint8_t* nal_new_start = NULL;
int nal_new_allocated = 0;
end = remove_emulation_prev(buf_in, end, buf_in, end);
nal_start = ff_avc_find_startcode(buf_in, end);
for (;;) {
while (nal_start < end && !*(nal_start++));
if (nal_start == end)
break;
nal_end = ff_avc_find_startcode(nal_start, end);
int nal_unit_type = *nal_start & 0x1F;
int nal_size = nal_end - nal_start;
// NAL unit with length of 48 bytes or fewer is completely unencrypted.
if ((nal_unit_type == 1 || nal_unit_type == 5) && nal_size > 48) {
uint8_t* nal_start_bkup = nal_start;
nal_start += 32;
void *ctx = AES128_CBC_CTX_new();
AES128_CBC_DecryptInit(ctx, s->enc_aes.key_value, s->enc_aes.iv_value, false);
while (nal_start + 16 < nal_end) {
AES128_CBC_DecryptUpdate(ctx, nal_start, nal_start, 16);
nal_start += 16 * 10; // Each 16-byte block of encrypted data is followed by up to nine 16-byte blocks of unencrypted data.
}
AES128_CBC_free(ctx);
nal_start = nal_start_bkup;
}
int bytes_inserted = 0;
if (nal_size) {
int nal_new_maxsize = nal_size * 4 / 3;
nal_new_start = realloc(nal_new_start, nal_new_maxsize);
nal_new_allocated = MAX(nal_new_allocated, nal_new_maxsize);
bytes_inserted = insert_emulation_prev(nal_start, nal_end, nal_new_start, nal_new_start + nal_new_maxsize);
}
if (bytes_inserted) {
memmove(nal_end + bytes_inserted, nal_end, end - nal_end);
memcpy(nal_start, nal_new_start, nal_size + bytes_inserted);
nal_start = nal_end + bytes_inserted;
end += bytes_inserted;
}
else
nal_start = nal_end;
}
free(nal_new_start);
return (int)(end - buf_in);
}
static int sample_aes_decrypt_audio_data(hls_media_segment_t *s, uint8_t *ptr, uint32_t size, audiotype_t audio_codec)
{
bool (* get_next_frame)(const uint8_t **, const uint8_t *, uint32_t *);
switch (audio_codec)
{
case AUDIO_ADTS:
get_next_frame = adts_get_next_frame;
break;
case AUDIO_AC3:
get_next_frame = ac3_get_next_frame;
break;
case AUDIO_EC3:
get_next_frame = ec3_get_next_frame;
break;
case AUDIO_UNKNOWN:
default:
MSG_ERROR("Wrong audio_codec! Should never happen here > EXIT!\n");
exit(1);
}
uint8_t *audio_frame = ptr;
uint8_t *end_ptr = ptr + size;
uint32_t frame_length = 0;
while (get_next_frame((const uint8_t **)&audio_frame, end_ptr, &frame_length)) {
// The IV must be reset at the beginning of every packet.
uint8_t leaderSize = 0;
if (audio_codec == AUDIO_ADTS) {
// ADTS headers can contain CRC checks.
// If the CRC check bit is 0, CRC exists.
//
// Header (7 or 9 byte) + unencrypted leader (16 bytes)
leaderSize = (audio_frame[1] & 0x01) ? 23 : 25;
} else { // AUDIO_AC3, AUDIO_EC3
// AC3 Audio is untested. Sample streams welcome.
//
// unencrypted leader
leaderSize = 16;
}
int tmp_size = frame_length > leaderSize ? (frame_length - leaderSize) & 0xFFFFFFF0 : 0;
if (tmp_size) {
void *ctx = AES128_CBC_CTX_new();
AES128_CBC_DecryptInit(ctx, s->enc_aes.key_value, s->enc_aes.iv_value, false);
AES128_CBC_DecryptUpdate(ctx, audio_frame + leaderSize, audio_frame + leaderSize, tmp_size);
AES128_CBC_free(ctx);
}
audio_frame += frame_length;
}
return 0;
}
static int sample_aes_handle_pes_data(hls_media_segment_t *s, ByteBuffer_t *out, ByteBuffer_t *in, uint8_t *pcr, uint16_t pid, audiotype_t audio_codec, uint8_t *counter)
{
uint16_t pes_header_size = 0;
// we need to skip PES header it is not part of NAL unit
if (in->pos <= PES_HEADER_SIZE || in->data[0] != 0x00 || in->data[1] != 0x00 || in->data[1] == 0x01) {
MSG_ERROR("Wrong or missing PES header!\n");
return -1;
}
pes_header_size = in->data[8] + 9;
if (pes_header_size >= in->pos) {
MSG_ERROR("Wrong PES header size %hu!\n", &pes_header_size);
return -1;
}
if (AUDIO_UNKNOWN == audio_codec) {
// handle video data in NAL units
int size = sample_aes_decrypt_nal_units(s, in->data + pes_header_size, in->pos - pes_header_size) + pes_header_size;
// to check if I did not any mistake in offset calculation
if (size > in->pos) {
MSG_ERROR("NAL size after decryption is grater then before - before: %d, after: %d - should never happen!\n", size, in->pos);
exit(-1);
}
// output size could be less then input because the start code emulation prevention could be removed if available
if (size < in->pos) {
// we need to update size in the PES header if it was set
int32_t payload_size = ((uint16_t)(in->data[4]) << 8) | in->data[5];
if (payload_size > 0) {
payload_size -= in->pos - size;
in->data[4] = (payload_size >> 8) & 0xff;
in->data[5] = payload_size & 0xff;
}
in->pos = size;
}
} else {
sample_aes_decrypt_audio_data(s, in->data + pes_header_size, in->pos - pes_header_size, audio_codec);
}
return sample_aes_append_av_data(out, in, pcr, pid, counter);
}
static int decrypt_sample_aes(hls_media_segment_t *s, ByteBuffer_t *buf)
{
int ret = 0;
fill_key_value(&(s->enc_aes));
if (buf->len > TS_PACKET_LENGTH && buf->data[0] == TS_SYNC_BYTE) {
pmt_data_t pmt = {0};
if (find_pmt(buf->data, buf->len, &pmt)) {
bool write_pmt = true;
uint16_t audio_PID = PID_UNSPEC;
uint16_t video_PID = PID_UNSPEC;
audiotype_t audio_codec = AUDIO_UNKNOWN;
uint32_t i;
// https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption/TransportStreamSignaling/TransportStreamSignaling.html
for (i=0; i < pmt.component_num; ++i) {
uint8_t stream_type = pmt.components[i].stream_type;
switch (stream_type) {
case 0xdb:
video_PID = pmt.components[i].elementary_PID;
stream_type = 0x1B; // AVC video stream as defined in ITU-T Rec. H.264 | ISO/IEC 14496-10 Video, or AVC base layer of an HEVC video stream as defined in ITU-T H.265 | ISO/IEC 23008-2
break;
case 0xcf:
audio_codec = AUDIO_ADTS;
audio_PID = pmt.components[i].elementary_PID;
stream_type = 0x0F; // ISO/IEC 13818-7 Audio with ADTS transport syntax
break;
case 0xc1:
audio_codec = AUDIO_AC3;
audio_PID = pmt.components[i].elementary_PID;