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Diffstat (limited to 'src/av_format_identify.c')
-rw-r--r--src/av_format_identify.c85
1 files changed, 24 insertions, 61 deletions
diff --git a/src/av_format_identify.c b/src/av_format_identify.c
index ef6f0c1..fa1c63e 100644
--- a/src/av_format_identify.c
+++ b/src/av_format_identify.c
@@ -30,22 +30,6 @@ const char *g_mp4_box_type_all[] = { "ftyp","pdin","moov","mvhd","meta",
"mere","styp","sidx","ssix","prft", "uuid" };
const int g_mp4_box_type_count = sizeof(g_mp4_box_type_all) / sizeof(char *);
-/*To find that whether the initial size bytes pointed to by buff satisfies the rules of MPEG-TS AV Container
- * by supposing that its first 1 byte is sync_byte in ts header.*/
-
-/*To identify whether the whole byte stream belongs to MPEG_TS container*/
-
-
-
-/*To find that whether the initial size bytes pointed to by buff satisfies the rules of FLV AV Container
- * by supposing that its first 1 byte is TagType in FLV Tag Header.*/
-
-/*To identify whether the whole byte stream belongs to FLV container*/
-
-/*To find that whether the initial size bytes pointed to by buff satisfies the rules of MP4 AV Container
- * by supposing that its first 4 byte is Boxtype in Box of MP4 file.*/
-
- /*To identify whether the whole byte stream belongs to MP4 container*/
#pragma pack (1)
typedef struct ts_pkg_t
{
@@ -57,6 +41,8 @@ typedef struct ts_pkg_t
#pragma pack ()
#define MIN_TS_PKT_LEN (sizeof(ts_pkg)-8)
+/*To find that whether the initial size bytes pointed to by buff satisfies the rules of MPEG-TS AV Container
+* by supposing that its first 1 byte is sync_byte in ts header.*/
int is_mpeg_ts_each(const char *buff, size_t size)
{
int ret = 0;
@@ -64,18 +50,13 @@ int is_mpeg_ts_each(const char *buff, size_t size)
const char *p = buff;
const ts_pkg *pkg = NULL;
- //uint16_t cont_cnt_pre=0, cont_cnt_cur=0;
- //cont_cnt_pre = (*(uint16_t *)(pkg->con_cnt)) & 0x0f;
uint8_t cont_cnt_pre = 0, cont_cnt_cur = 0;
- //cont_cnt_pre = pkg->con_cnt;
uint16_t pid_pre=0, pid_cur=0;
- //pid_pre = (htons(*(uint16_t *)(pkg->con_pid))) << 3 >> 3;
int group[3] = { 1,2,4 };
- //p += TS_PKT_SIZE;
/*when p == buff(first of while), record pid and continuous_count of package head and go to fit_times++ directly.
special for mpeg-ts cause of the format requirement for two packages together.*/
if (p - buff + MIN_TS_PKT_LEN > size)
@@ -85,11 +66,11 @@ int is_mpeg_ts_each(const char *buff, size_t size)
pkg = (const ts_pkg *)p;
pid_pre = htons(pkg->con_pid) & 0x1fff;//(htons(pkg->con_pid)) << 3 >> 3;//?
- cont_cnt_pre = (pkg->con_cnt) & 0x0f;//(pkg->con_cnt) >> 4;
+ cont_cnt_pre = (pkg->con_cnt) & 0x0f;
p += TS_PKT_SIZE;
fit_times++;
- while (p - buff + MIN_TS_PKT_LEN <= size)//while (p < (buff + size))
+ while (p - buff + MIN_TS_PKT_LEN <= size)
{
pkg = (const ts_pkg *)p;
if (pkg->sync_byte != TS_SYNC_BYTE)
@@ -97,11 +78,10 @@ int is_mpeg_ts_each(const char *buff, size_t size)
break;
}
- pid_cur = htons(pkg->con_pid) & 0x1fff;//(htons(pkg->con_pid)) << 3 >> 3;
- //pid_cur = ((htonl(*(uint32_t *)(p+TS_PKT_SIZE)) & 0x000fff00) >> 8) + ((((htonl(*(uint32_t *)(p + TS_PKT_SIZE)) & 0x00f00000) >> 20) % 2) << 12);
+ pid_cur = htons(pkg->con_pid) & 0x1fff;
if (pid_cur == pid_pre && pid_cur != 8191)//
{
- cont_cnt_cur = (pkg->con_cnt) & 0x0f;//(pkg->con_cnt) >> 4;// p + TS_PKT_SIZE;//cont_cnt_cur = (*(uint16_t *)(p + TS_PKT_SIZE)) & 0x0f;
+ cont_cnt_cur = (pkg->con_cnt) & 0x0f;
if (cont_cnt_cur != (cont_cnt_pre + 1) % 16)
{
break;
@@ -122,7 +102,7 @@ int is_mpeg_ts_each(const char *buff, size_t size)
const char *pkg_seg = buff + whole_pkg_cnt / group[i] * TS_PKT_SIZE;
if (*pkg_seg != TS_SYNC_BYTE)
{
- return ret;//break;
+ return ret;
}
}
ret = 1;
@@ -136,6 +116,7 @@ int is_mpeg_ts_each(const char *buff, size_t size)
return ret;
}
+/*To identify whether the whole byte stream belongs to MPEG_TS container*/
int is_mpeg_ts(const char* buff, size_t size)
{
const char *p = buff;
@@ -179,11 +160,14 @@ typedef struct flv_tag_t
{
uint32_t pre_len;
uint8_t tag_type;
- uint32_t con_pyld_len;//uint8_t pyld_len[3];//payload length
+ uint32_t con_pyld_len;//payload length
+ char *pyld_data;
}flv_tag;
#pragma pack ()
-#define MIN_FLV_TAG_LEN (sizeof(flv_tag))//(sizeof(flv_tag) + 1)//?
+#define MIN_FLV_TAG_LEN (sizeof(flv_tag)-8);//(sizeof(flv_tag) + 1)//?
+/*To find that whether the initial size bytes pointed to by buff satisfies the rules of FLV AV Container
+* by supposing that its first 1 byte is TagType in FLV Tag Header.*/
int is_flv_each(const char* buff, size_t size)
{
int ret = 0;
@@ -191,9 +175,6 @@ int is_flv_each(const char* buff, size_t size)
const char *p = buff;
const flv_tag *tag = NULL;
- //uint32_t tag_len_show = 0;
- //uint32_t tag_len_cnt = 0;// = 11 + (htonl(*(size_t *)p) & 0x00ffffff);
- //p += (tag_len_cnt + 4);
uint32_t tag_len_cnt = 0;
uint32_t tag_len_show = 0;
if (p - buff + MIN_FLV_TAG_LEN - 4 > size)
@@ -205,7 +186,7 @@ int is_flv_each(const char* buff, size_t size)
p += tag_len_cnt;//p is the first previous_length after buff
fit_times++;
- while (p - buff + MIN_FLV_TAG_LEN <= size)//while (p < (buff + size))
+ while (p - buff + MIN_FLV_TAG_LEN <= size)
{
tag = (const flv_tag *)p;
tag_len_show = htonl(tag->pre_len);
@@ -219,7 +200,7 @@ int is_flv_each(const char* buff, size_t size)
break;
}
- uint32_t tag_len_cnt = (htonl(tag->con_pyld_len) >> 8) + 11;//11 + (htonl(*(uint32_t *)(tag->pyld_len)) >> 8);//(htonl(*(uint32_t *)tag)) & 0x00ffffff;
+ uint32_t tag_len_cnt = (htonl(tag->con_pyld_len) >> 8) + 11;
fit_times++;
if (fit_times >= FIT_TIMES)
@@ -232,6 +213,7 @@ int is_flv_each(const char* buff, size_t size)
return ret;
}
+/*To identify whether the whole byte stream belongs to FLV container*/
int is_flv(const char* buff, size_t size)
{
int is_flv = 0;
@@ -272,15 +254,10 @@ int is_mp4_boxname_deep(const char *buff)
-int is_mp4_boxname(const char *buff)// , size_t size)
+int is_mp4_boxname(const char *buff)
{
int i=0,raw_filter=0;
- /*
- if (size<4)
- {
- return 0;
- }
- */
+
for (i = 0; i < 4; i++)
{
if (((*(buff + i) >= '0') && (*(buff + i) <= '9')) || ((*(buff + i) >= 'a') && (*(buff + i) <= 'z')))
@@ -313,7 +290,6 @@ void *memmem_mp4(const char *buff, size_t size)
const char *p = buff;
while (p + 3 < buff + size)
{
- //if (is_mp4_boxname(p) == 1)
if ((is_mp4_boxname(p) == 1) && (is_mp4_boxname_deep(p) == 1))
{
ret_memmp4 = (void *)p;
@@ -337,12 +313,14 @@ typedef struct mp4_box_t
#pragma pack ()
#define MIN_MP4_BOX_SIZE (sizeof(mp4_box)-8)
#define htonll(buff) (((uint64_t) htonl(buff)) << 32) + htonl(buff >> 32)//(((uint64_t)(htonl(*(uint32_t *)buff))<<32)+htonl(*(uint32_t *)(buff+4)))
+
+/*To find that whether the initial size bytes pointed to by buff satisfies the rules of MP4 AV Container
+* by supposing that its first 4 byte is Boxtype in Box of MP4 file.*/
int is_mp4_each(const char* buff, size_t size)
{
int ret = 0;
int fit_times = 0;
const char *p = buff;
- //const char *q = NULL;
const mp4_box *box=NULL;
uint64_t offset = 0;
@@ -351,15 +329,6 @@ int is_mp4_each(const char* buff, size_t size)
box = (const mp4_box *)p;//?
if(!is_mp4_boxname(box->name))//?,sizeof(box->name))
{
- /*if (offset <= 0xffffffff)
- {
- p = q + 8;
- box = (const mp4_box *)p;
- }
- if (!is_mp4_boxname(box->name))
- {
- break;
- }*/
break;
}
fit_times++;
@@ -374,7 +343,7 @@ int is_mp4_each(const char* buff, size_t size)
{
if(size-(p-buff)>sizeof(mp4_box))//???
{
- offset = htonll(box->large_size);//htonll(&(box->large_size));//p += htonll(&box->large_size);//p+=htonll(box->large_size);//TODO: Implement htonll
+ offset = htonll(box->large_size);
}
else
{
@@ -383,22 +352,16 @@ int is_mp4_each(const char* buff, size_t size)
}
else
{
- offset = htonl(box->atom_size);//p+=htonl(box->atom_size);
+ offset = htonl(box->atom_size);
}
- //q = p;
p += offset;
}
- /*else
- {
- ret = 0;
- }//
- */
return ret;
}
-
+/*To identify whether the whole byte stream belongs to MP4 container*/
int is_mp4(const char* buff, size_t size)
{
int is_mp4 = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-30 15:28:29 +0000