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Code Issues Releases Activity

avcodec/hevcdec: remove duplicate extradata parsing function

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Use ff_hevc_decode_extradata() instead, which correctly only tries
to decode parameter set NAL units and not any other NAL that may be
present in extradata.

Reviewed-by: nevcairiel
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2017-04-02 15:41:10 -03:00
parent 498e9e8e2a
commit 4588063f3e
2 changed files with 7 additions and 56 deletions
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61
libavcodec/hevcdec.c
View File

@ -39,6 +39,7 @@
#include "golomb.h"
#include "hevc.h"
#include "hevc_data.h"
#include "hevc_parse.h"
#include "hevcdec.h"
#include "profiles.h"
@ -2994,63 +2995,13 @@ static int verify_md5(HEVCContext *s, AVFrame *frame)
static int hevc_decode_extradata(HEVCContext *s, uint8_t *buf, int length)
{
AVCodecContext *avctx = s->avctx;
GetByteContext gb;
int ret, i;
bytestream2_init(&gb, buf, length);
if (length > 3 && (buf[0] || buf[1] || buf[2] > 1)) {
/* It seems the extradata is encoded as hvcC format.
* Temporarily, we support configurationVersion==0 until 14496-15 3rd
* is finalized. When finalized, configurationVersion will be 1 and we
* can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
int i, j, num_arrays, nal_len_size;
s->is_nalff = 1;
bytestream2_skip(&gb, 21);
nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
num_arrays = bytestream2_get_byte(&gb);
/* nal units in the hvcC always have length coded with 2 bytes,
* so put a fake nal_length_size = 2 while parsing them */
s->nal_length_size = 2;
/* Decode nal units from hvcC. */
for (i = 0; i < num_arrays; i++) {
int type = bytestream2_get_byte(&gb) & 0x3f;
int cnt = bytestream2_get_be16(&gb);
for (j = 0; j < cnt; j++) {
// +2 for the nal size field
int nalsize = bytestream2_peek_be16(&gb) + 2;
if (bytestream2_get_bytes_left(&gb) < nalsize) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid NAL unit size in extradata.\n");
return AVERROR_INVALIDDATA;
}
ret = decode_nal_units(s, gb.buffer, nalsize);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Decoding nal unit %d %d from hvcC failed\n",
type, i);
return ret;
}
bytestream2_skip(&gb, nalsize);
}
}
/* Now store right nal length size, that will be used to parse
* all other nals */
s->nal_length_size = nal_len_size;
} else {
s->is_nalff = 0;
ret = decode_nal_units(s, buf, length);
if (ret < 0)
return ret;
}
ret = ff_hevc_decode_extradata(buf, length, &s->ps, &s->is_nalff,
&s->nal_length_size, s->avctx->err_recognition,
s->apply_defdispwin, s->avctx);
if (ret < 0)
return ret;
/* export stream parameters from the first SPS */
for (i = 0; i < FF_ARRAY_ELEMS(s->ps.sps_list); i++) {

2
libavcodec/hevcdec.h
View File

@ -564,7 +564,7 @@ typedef struct HEVCContext {
uint8_t is_md5;
uint8_t context_initialized;
uint8_t is_nalff; ///< this flag is != 0 if bitstream is encapsulated
int is_nalff; ///< this flag is != 0 if bitstream is encapsulated
///< as a format defined in 14496-15
int apply_defdispwin;