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avcodec/dca: remove GetBitContext usage from avpriv_dca_parse_core_frame_header() 

This prevents potential ABI issues with GetBitContext.

Reviewed-by: foo86 <foobaz86@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2017-07-19 01:53:22 -03:00
parent 99c5ac2039
commit 7c9d2ad45f
5 changed files with 19 additions and 10 deletions
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12
libavcodec/dca.c
View File

@ -88,7 +88,7 @@ int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
}
}
int avpriv_dca_parse_core_frame_header(GetBitContext *gb, DCACoreFrameHeader *h)
int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
{
if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
return DCA_PARSE_ERROR_SYNC_WORD;
@ -145,3 +145,13 @@ int avpriv_dca_parse_core_frame_header(GetBitContext *gb, DCACoreFrameHeader *h)
h->dn_code = get_bits(gb, 4);
return 0;
}
int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, uint8_t *buf, int size)
{
GetBitContext gb;
if (init_get_bits8(&gb, buf, size) < 0)
return DCA_PARSE_ERROR_INVALIDDATA;
return ff_dca_parse_core_frame_header(h, &gb);
}

7
libavcodec/dca.h
View File

@ -45,7 +45,8 @@ enum DCAParseError {
DCA_PARSE_ERROR_SAMPLE_RATE = -6,
DCA_PARSE_ERROR_RESERVED_BIT = -7,
DCA_PARSE_ERROR_LFE_FLAG = -8,
DCA_PARSE_ERROR_PCM_RES = -9
DCA_PARSE_ERROR_PCM_RES = -9,
DCA_PARSE_ERROR_INVALIDDATA = -10,
};
typedef struct DCACoreFrameHeader {
@ -212,6 +213,8 @@ int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
* Parse and validate core frame header
* @return 0 on success, negative DCA_PARSE_ERROR_ code on failure
*/
int avpriv_dca_parse_core_frame_header(GetBitContext *gb, DCACoreFrameHeader *h);
int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, uint8_t *buf, int size);
int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb);
#endif /* AVCODEC_DCA_H */

2
libavcodec/dca_core.c
View File

@ -82,7 +82,7 @@ static void get_array(GetBitContext *s, int32_t *array, int size, int n)
static int parse_frame_header(DCACoreDecoder *s)
{
DCACoreFrameHeader h = { 0 };
int err = avpriv_dca_parse_core_frame_header(&s->gb, &h);
int err = ff_dca_parse_core_frame_header(&h, &s->gb);
if (err < 0) {
switch (err) {

4
libavcodec/dca_parser.c
View File

@ -263,9 +263,7 @@ static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf,
if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE,
hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
return ret;
if ((ret = init_get_bits8(&gb, hdr, ret)) < 0)
return ret;
if (avpriv_dca_parse_core_frame_header(&gb, &h) < 0)
if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
return AVERROR_INVALIDDATA;
*duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES;

4
libavformat/dtsdec.c
View File

@ -101,9 +101,7 @@ static int dts_probe(AVProbeData *p)
if ((ret = avpriv_dca_convert_bitstream(buf - 2, DCA_CORE_FRAME_HEADER_SIZE,
hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
continue;
if (init_get_bits8(&gb, hdr, ret) < 0)
continue;
if (avpriv_dca_parse_core_frame_header(&gb, &h) < 0)
if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
continue;
marker += 4 * h.sr_code;