FFmpeg: libavformat/hca.c Source File
Go to the documentation of this file. 1 /*
2 * HCA demuxer
3 * Copyright (c) 2020 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
25
29
30 #define HCA_MASK 0x7f7f7f7f
31
38
40 {
42 return 0;
43
45 return 0;
46
48 }
49
51 {
57 uint32_t chunk;
59 uint32_t block_count;
60 uint16_t block_size, data_offset;
62
65
67 if (data_offset <= 8)
69
71 if (!st)
73
78
80 if (ret < par->extradata_size - 8 - 10)
88
90
91 if ((bytestream2_get_le32(&gb) &
HCA_MASK) !=
MKTAG(
'f',
'm',
't', 0))
93
99 block_count = bytestream2_get_be32(&gb);
101 chunk = bytestream2_get_le32(&gb) &
HCA_MASK;
102 if (chunk ==
MKTAG(
'c',
'o',
'm',
'p')) {
103 block_size = bytestream2_get_be16(&gb);
104 }
else if (chunk ==
MKTAG(
'd',
'e',
'c', 0)) {
105 block_size = bytestream2_get_be16(&gb);
106 } else {
108 }
109
110 if (block_size < 8)
114
117
118 return 0;
119 }
120
122 {
125
129 }
130
131 #define OFFSET(x) offsetof(HCADemuxContext, x)
133 { "hca_lowkey",
134 "Low key used for handling CRI HCA files",
OFFSET(keyl),
136 { "hca_highkey",
137 "High key used for handling CRI HCA files",
OFFSET(keyh),
139 { "hca_subkey",
140 "Subkey used for handling CRI HCA files",
OFFSET(subkey),
143 };
144
150 };
151
156 .p.extensions = "hca",
162 };
static const AVClass hca_class
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
enum AVMediaType codec_type
General type of the encoded data.
This struct describes the properties of an encoded stream.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
static const AVOption hca_options[]
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
int nb_channels
Number of channels in this layout.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
int64_t duration
Decoding: duration of the stream, in stream time base.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
@ AV_OPT_TYPE_INT64
Underlying C type is int64_t.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define LIBAVUTIL_VERSION_INT
static int read_header(FFV1Context *f)
Describe the class of an AVClass context structure.
const char * av_default_item_name(void *ptr)
Return the context name.
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
static int hca_read_header(AVFormatContext *s)
int extradata_size
Size of the extradata content in bytes.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int block_align
Audio only.
static int hca_probe(const AVProbeData *p)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
unsigned int avio_rb16(AVIOContext *s)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
const FFInputFormat ff_hca_demuxer
@ AV_OPT_TYPE_INT
Underlying C type is int.
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
#define AV_OPT_FLAG_DECODING_PARAM
A generic parameter which can be set by the user for demuxing or decoding.
static int read_probe(const AVProbeData *p)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
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