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avcodec/mqcenc: Add ff_mqc_flush_to()

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This is needed to separate the end padding from the bitstream, allowing
to end it multiple times without disturbing it.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-17 20:11:43 +02:00
parent 2687a51a3f
commit e6190045b3
2 changed files with 22 additions and 0 deletions
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1
libavcodec/mqc.h
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@ -59,6 +59,7 @@ int ff_mqc_length(MqcState *mqc);
/** flush the encoder [returns number of bytes encoded] */ /** flush the encoder [returns number of bytes encoded] */
int ff_mqc_flush(MqcState *mqc); int ff_mqc_flush(MqcState *mqc);
int ff_mqc_flush_to(MqcState *mqc, uint8_t *dst, int *dst_len);
/* decoder */ /* decoder */

21
libavcodec/mqcenc.c
View File

@ -25,6 +25,7 @@
* @author Kamil Nowosad * @author Kamil Nowosad
*/ */
#include "libavutil/avassert.h"
#include "mqc.h" #include "mqc.h"
static void byteout(MqcState *mqc) static void byteout(MqcState *mqc)
@ -117,3 +118,23 @@ int ff_mqc_flush(MqcState *mqc)
mqc->bp++; mqc->bp++;
return mqc->bp - mqc->bpstart; return mqc->bp - mqc->bpstart;
} }
int ff_mqc_flush_to(MqcState *mqc, uint8_t *dst, int *dst_len)
{
int len;
MqcState mqc2 = *mqc;
mqc2.bpstart=
mqc2.bp = dst;
*mqc2.bp = *mqc->bp;
ff_mqc_flush(&mqc2);
*dst_len = mqc2.bp - dst;
if (mqc->bp < mqc->bpstart) {
av_assert1(mqc->bpstart - mqc->bp == 1);
av_assert1(*dst_len > 0);
av_assert1(mqc->bp[0] == 0 && dst[0] == 0);
(*dst_len) --;
memmove(dst, dst+1, *dst_len);
return mqc->bp - mqc->bpstart + 1 + *dst_len;
}
return mqc->bp - mqc->bpstart + *dst_len;
}