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Code Issues Releases Activity

avformat/oggparseflac: use the GetByteContext API

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All but one read are byte aligned, so there's no point in using the
GetBitContext API.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2023-05-30 18:36:17 -03:00
parent d2b46c1ef7
commit da23151eaf
1 changed files with 12 additions and 15 deletions
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27
libavformat/oggparseflac.c
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@@ -20,7 +20,7 @@
#include <stdlib.h>
#include "libavcodec/avcodec.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/flac.h"
#include "avformat.h"
#include "internal.h"
@@ -34,31 +34,28 @@ flac_header (AVFormatContext * s, int idx)
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
GetBitContext gb;
GetByteContext gb;
int mdt, ret;
if (os->buf[os->pstart] == 0xff)
return 0;
ret = init_get_bits8(&gb, os->buf + os->pstart, os->psize);
if (ret < 0)
return ret;
skip_bits1(&gb); /* metadata_last */
mdt = get_bits(&gb, 7);
bytestream2_init(&gb, os->buf + os->pstart, os->psize);
mdt = bytestream2_get_byte(&gb) & 0x7F;
if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
uint32_t samplerate;
skip_bits_long(&gb, 4*8); /* "FLAC" */
if(get_bits(&gb, 8) != 1) /* unsupported major version */
if (bytestream2_get_bytes_left(&gb) < 4 + 4 + 4 + 4 + FLAC_STREAMINFO_SIZE)
return AVERROR_INVALIDDATA;
bytestream2_skipu(&gb, 4); /* "FLAC" */
if (bytestream2_get_byteu(&gb) != 1) /* unsupported major version */
return -1;
skip_bits(&gb, 8 + 16); /* minor version + header count */
skip_bits_long(&gb, 4*8); /* "fLaC" */
bytestream2_skipu(&gb, 1 + 2); /* minor version + header count */
bytestream2_skipu(&gb, 4); /* "fLaC" */
/* METADATA_BLOCK_HEADER */
if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
if (bytestream2_get_be32u(&gb) != FLAC_STREAMINFO_SIZE)
return -1;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
@@ -67,7 +64,7 @@ flac_header (AVFormatContext * s, int idx)
if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
return ret;
memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size);
bytestream2_get_bufferu(&gb, st->codecpar->extradata, FLAC_STREAMINFO_SIZE);
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
if (!samplerate)