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Code Issues Releases Wiki Activity

move the annexb decode utility to protocol.

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This commit is contained in:
winlin 2014-11-07 23:07:31 +08:00
parent bd25626f0e
commit 72ad6894ca
8 changed files with 128 additions and 69 deletions
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30
trunk/src/rtmp/srs_protocol_utility.cpp
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@ -28,6 +28,7 @@ using namespace std;
#include <srs_kernel_log.hpp>
#include <srs_kernel_utility.hpp>
#include <srs_kernel_stream.hpp>
void srs_discovery_tc_url(
string tcUrl,
@ -155,3 +156,32 @@ bool srs_bytes_equals(void* pa, void* pb, int size)
return true;
}
bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code)
{
char* bytes = stream->data() + stream->pos();
char* p = bytes;
for (;;) {
if (!stream->require(p - bytes + 3)) {
return false;
}
// not match
if (p[0] != 0x00 || p[1] != 0x00) {
return false;
}
// match N[00] 00 00 01, where N>=0
if (p[2] == 0x01) {
if (pnb_start_code) {
*pnb_start_code = (int)(p - bytes) + 3;
}
return true;
}
p++;
}
return false;
}

11
trunk/src/rtmp/srs_protocol_utility.hpp
View file

@ -33,6 +33,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#include <srs_kernel_consts.hpp>
class SrsStream;
/**
* parse the tcUrl, output the schema, host, vhost, app and port.
* @param tcUrl, the input tcUrl, for example,
@ -85,5 +87,14 @@ extern std::string srs_generate_tc_url(
*/
extern bool srs_bytes_equals(void* pa, void* pb, int size);
/**
* whether stream starts with the avc NALU in "AnnexB"
* from H.264-AVC-ISO_IEC_14496-10.pdf, page 211.
* start code must be "N[00] 00 00 01" where N>=0
* @param pnb_start_code output the size of start code, must >=3.
* NULL to ignore.
*/
extern bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code = NULL);
#endif