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libavformat: Move avc mp4 startcode parsing to a shared file 

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-09-24 11:17:04 +03:00
parent c463dfc7e4
commit a2efbecc4e
3 changed files with 22 additions and 17 deletions
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17
libavformat/avc.c
View File

@ -191,3 +191,20 @@ int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
*size = out_size; *size = out_size;
return 0; return 0;
} }
const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start,
const uint8_t *end,
int nal_length_size)
{
unsigned int res = 0;
if (end - start < nal_length_size)
return NULL;
while (nal_length_size--)
res = (res << 8) | *start++;
if (res > end - start)
return NULL;
return start + res;
}

3
libavformat/avc.h
View File

@ -30,5 +30,8 @@ int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size);
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len); int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len);
const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end); const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end);
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size); int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size);
const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start,
const uint8_t *end,
int nal_length_size);
#endif /* AVFORMAT_AVC_H */ #endif /* AVFORMAT_AVC_H */

19
libavformat/rtpenc_h264.c
View File

@ -29,21 +29,6 @@
#include "avc.h" #include "avc.h"
#include "rtpenc.h" #include "rtpenc.h"
static const uint8_t *avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size)
{
unsigned int res = 0;
if (end - start < nal_length_size)
return NULL;
while (nal_length_size--)
res = (res << 8) | *start++;
if (res > end - start)
return NULL;
return start + res;
}
static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last) static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
{ {
RTPMuxContext *s = s1->priv_data; RTPMuxContext *s = s1->priv_data;
@ -88,14 +73,14 @@ void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)
s->timestamp = s->cur_timestamp; s->timestamp = s->cur_timestamp;
if (s->nal_length_size) if (s->nal_length_size)
r = avc_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end; r = ff_avc_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end;
else else
r = ff_avc_find_startcode(buf1, end); r = ff_avc_find_startcode(buf1, end);
while (r < end) { while (r < end) {
const uint8_t *r1; const uint8_t *r1;
if (s->nal_length_size) { if (s->nal_length_size) {
r1 = avc_mp4_find_startcode(r, end, s->nal_length_size); r1 = ff_avc_mp4_find_startcode(r, end, s->nal_length_size);
if (!r1) if (!r1)
r1 = end; r1 = end;
r += s->nal_length_size; r += s->nal_length_size;