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Merge commit '90ed6c5cf7f236bc9efb47c97b40358c666d1386'

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* commit '90ed6c5cf7f236bc9efb47c97b40358c666d1386':
  h2645_parse: compute the actual data length, without trailing paddding

Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Derek Buitenhuis 2016-04-26 14:09:52 +01:00
commit 79aafd43fd
2 changed files with 42 additions and 3 deletions
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39
libavcodec/h2645_parse.c
View File

@ -22,14 +22,13 @@
#include "config.h"
#include "libavutil/intmath.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "hevc.h"
#include "h2645_parse.h"
/* FIXME: This is adapted from ff_h264_decode_nal, avoiding duplication
* between these functions would be nice. */
int ff_h2645_extract_rbsp(const uint8_t *src, int length,
H2645NAL *nal)
{
@ -178,6 +177,31 @@ static const char *nal_unit_name(int nal_type)
}
}
static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
{
int size = nal->size;
int v;
while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0)
size--;
if (!size)
return 0;
v = nal->data[size - 1];
if (size > INT_MAX / 8)
return AVERROR(ERANGE);
size *= 8;
/* remove the stop bit and following trailing zeros,
* or nothing for damaged bitstreams */
if (v)
size -= ff_ctz(v) + 1;
return size;
}
/**
* @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
* 0 if the unit should be skipped, 1 otherwise
@ -231,6 +255,7 @@ int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
while (length >= 4) {
H2645NAL *nal;
int extract_length = 0;
int skip_trailing_zeros = 1;
if (is_nalff) {
int i;
@ -292,7 +317,15 @@ int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
pkt->nb_nals++;
ret = init_get_bits8(&nal->gb, nal->data, nal->size);
/* see commit 3566042a0 */
if (consumed < length - 3 &&
buf[consumed] == 0x00 && buf[consumed + 1] == 0x00 &&
buf[consumed + 2] == 0x01 && buf[consumed + 3] == 0xE0)
skip_trailing_zeros = 0;
nal->size_bits = get_bit_length(nal, skip_trailing_zeros);
ret = init_get_bits8(&nal->gb, nal->data, nal->size_bits);
if (ret < 0)
return ret;

6
libavcodec/h2645_parse.h
View File

@ -33,6 +33,12 @@ typedef struct H2645NAL {
int size;
const uint8_t *data;
/**
* Size, in bits, of just the data, excluding the stop bit and any trailing
* padding. I.e. what HEVC calls SODB.
*/
int size_bits;
int raw_size;
const uint8_t *raw_data;