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avcodec/ac3_parser: add avpriv_ac3_parse_header2() and use it in libavcodec

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The new function has the ability to allocate the structure, allowing it to grow
without needing major bumps

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-01 01:47:33 +01:00
parent df6d21c1e7
commit eadc21cfe7
3 changed files with 25 additions and 6 deletions
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22
libavcodec/ac3_parser.c
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@ -47,9 +47,16 @@ static const uint8_t center_levels[4] = { 4, 5, 6, 5 };
static const uint8_t surround_levels[4] = { 4, 6, 7, 6 };
int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
int avpriv_ac3_parse_header2(GetBitContext *gbc, AC3HeaderInfo **phdr)
{
int frame_size_code;
AC3HeaderInfo *hdr;
if (!*phdr)
*phdr = av_mallocz(sizeof(AC3HeaderInfo));
if (!*phdr)
return AVERROR(ENOMEM);
hdr = *phdr;
memset(hdr, 0, sizeof(*hdr));
@ -144,6 +151,15 @@ int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
return 0;
}
int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
{
AC3HeaderInfo tmp, *ptmp = &tmp;
int ret = avpriv_ac3_parse_header2(gbc, &ptmp);
memcpy(hdr, ptmp, ((intptr_t)&tmp.channel_layout) - ((intptr_t)&tmp) + sizeof(uint64_t));
return ret;
}
static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
int *need_next_header, int *new_frame_start)
{
@ -152,11 +168,11 @@ static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
uint64_t u64;
uint8_t u8[8];
} tmp = { av_be2ne64(state) };
AC3HeaderInfo hdr;
AC3HeaderInfo hdr, *phdr = &hdr;
GetBitContext gbc;
init_get_bits(&gbc, tmp.u8+8-AC3_HEADER_SIZE, 54);
err = avpriv_ac3_parse_header(&gbc, &hdr);
err = avpriv_ac3_parse_header2(&gbc, &phdr);
if(err < 0)
return 0;