#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio.h"
+#include "avc.h"
-const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end)
+static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
{
- const uint8_t *a = p + 4 - ((long)p & 3);
+ const 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 )
+ 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 ) {
+ for (end -= 3; p < end; p += 4) {
uint32_t x = *(const uint32_t*)p;
-// if( (x - 0x01000100) & (~x) & 0x80008000 ) // little endian
-// if( (x - 0x00010001) & (~x) & 0x00800080 ) // big endian
- if( (x - 0x01010101) & (~x) & 0x80808080 ) { // generic
- if( p[1] == 0 ) {
- if( p[0] == 0 && p[2] == 1 )
- return p-1;
- if( p[2] == 0 && p[3] == 1 )
+// if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
+// if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
+ if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
+ if (p[1] == 0) {
+ if (p[0] == 0 && p[2] == 1)
return p;
- }
- if( p[3] == 0 ) {
- if( p[2] == 0 && p[4] == 1 )
+ if (p[2] == 0 && p[3] == 1)
return p+1;
- if( p[4] == 0 && p[5] == 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 )
+ for (end += 3; p < end; p++) {
+ if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
return end + 3;
}
-int ff_avc_parse_nal_units(const uint8_t *buf_in, uint8_t **buf, int *size)
+const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
+ const uint8_t *out= ff_avc_find_startcode_internal(p, end);
+ if(p<out && out<end && !out[-1]) out--;
+ return out;
+}
+
+int ff_avc_parse_nal_units(ByteIOContext *pb, const uint8_t *buf_in, int size)
{
- ByteIOContext *pb;
const uint8_t *p = buf_in;
- const uint8_t *end = p + *size;
+ const uint8_t *end = p + size;
const uint8_t *nal_start, *nal_end;
- int ret = url_open_dyn_buf(&pb);
- if(ret < 0)
- return ret;
+ size = 0;
nal_start = ff_avc_find_startcode(p, end);
while (nal_start < end) {
while(!*(nal_start++));
nal_end = ff_avc_find_startcode(nal_start, end);
put_be32(pb, nal_end - nal_start);
put_buffer(pb, nal_start, nal_end - nal_start);
+ size += 4 + nal_end - nal_start;
nal_start = nal_end;
}
+ return size;
+}
+
+int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
+{
+ ByteIOContext *pb;
+ int ret = url_open_dyn_buf(&pb);
+ if(ret < 0)
+ return ret;
+
+ ff_avc_parse_nal_units(pb, buf_in, *size);
+
av_freep(buf);
*size = url_close_dyn_buf(pb, buf);
return 0;
{
if (len > 6) {
/* check for h264 start code */
- if (AV_RB32(data) == 0x00000001) {
+ if (AV_RB32(data) == 0x00000001 ||
+ AV_RB24(data) == 0x000001) {
uint8_t *buf=NULL, *end, *start;
uint32_t sps_size=0, pps_size=0;
uint8_t *sps=0, *pps=0;
- int ret = ff_avc_parse_nal_units(data, &buf, &len);
+ int ret = ff_avc_parse_nal_units_buf(data, &buf, &len);
if (ret < 0)
return ret;
start = buf;