blob: 879e40c84ee3d964bbf8e1c594ff2ab365bd4087 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MP4_DEMUXER_ANNEX_B_H_
#define MP4_DEMUXER_ANNEX_B_H_
template <class T> struct already_AddRefed;
namespace mozilla {
class MediaRawData;
class MediaByteBuffer;
}
namespace mp4_demuxer
{
class ByteReader;
class AnnexB
{
public:
// All conversions assume size of NAL length field is 4 bytes.
// Convert a sample from AVCC format to Annex B.
static bool ConvertSampleToAnnexB(mozilla::MediaRawData* aSample, bool aAddSPS = true);
// Convert a sample from Annex B to AVCC.
// an AVCC extradata must not be set.
static bool ConvertSampleToAVCC(mozilla::MediaRawData* aSample);
static bool ConvertSampleTo4BytesAVCC(mozilla::MediaRawData* aSample);
// Parse an AVCC extradata and construct the Annex B sample header.
static already_AddRefed<mozilla::MediaByteBuffer> ConvertExtraDataToAnnexB(
const mozilla::MediaByteBuffer* aExtraData);
// Extract SPS and PPS NALs from aSample, aSample must be in AVCC format.
// If aSample already contains an extradata with an SPS, it will be returned
// otherwise the SPS/PPS NALs are searched in-band.
static already_AddRefed<mozilla::MediaByteBuffer> ExtractExtraData(
const mozilla::MediaRawData* aSample);
static bool HasSPS(const mozilla::MediaRawData* aSample);
static bool HasSPS(const mozilla::MediaByteBuffer* aExtraData);
// Returns true if format is AVCC and sample has valid extradata.
static bool IsAVCC(const mozilla::MediaRawData* aSample);
// Returns true if format is AnnexB.
static bool IsAnnexB(const mozilla::MediaRawData* aSample);
// Return true if both extradata are equal.
static bool CompareExtraData(const mozilla::MediaByteBuffer* aExtraData1,
const mozilla::MediaByteBuffer* aExtraData2);
private:
// AVCC box parser helper.
static void ConvertSPSOrPPS(ByteReader& aReader, uint8_t aCount,
mozilla::MediaByteBuffer* aAnnexB);
};
} // namespace mp4_demuxer
#endif // MP4_DEMUXER_ANNEX_B_H_
|
