FFmpeg: libavformat/sol.c Source File
Go to the documentation of this file. 1 /*
2 * Sierra SOL demuxer
3 * Copyright Konstantin Shishkov
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
22 /*
23 * Based on documents from Game Audio Player and own research
24 */
25
31
32 /* if we don't know the size in advance */
33 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
34
36 {
37 /* check file header */
39 if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
40 p->
buf[2] ==
'S' && p->
buf[3] ==
'O' &&
41 p->
buf[4] ==
'L' && p->
buf[5] == 0)
43 else
44 return 0;
45 }
46
50
52 {
55
56 if (magic == 0x0B8D)
58
61
63 }
64
66 {
67 if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
69 {
71 else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
72 else return 2;//SOL_DPCM_NEW8;
73 }
74 return -1;
75 }
76
78 {
80 return 2;
81 }
82
84 {
85 unsigned int magic,
tag;
90
91 /* check ".snd" header */
95 return -1;
99 if (magic != 0x0B8D)
100 avio_r8(pb);
/* newer SOLs contain padding byte */
101
104
107 else id = 0;
108
109 /* now we are ready: build format streams */
111 if (!st)
112 return -1;
121 return 0;
122 }
123
124 #define MAX_SIZE 4096
125
128 {
130
138 return 0;
139 }
140
148 };
static int sol_channels(int magic, int type)
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
static int sol_probe(const AVProbeData *p)
#define AV_CH_LAYOUT_MONO
static int sol_read_packet(AVFormatContext *s, AVPacket *pkt)
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
static int sol_codec_type(int magic, int type)
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
unsigned int avio_rl16(AVIOContext *s)
#define AV_CH_LAYOUT_STEREO
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
This structure contains the data a format has to probe a file.
int sample_rate
Audio only.
AVCodecID
Identify the syntax and semantics of the bitstream.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static enum AVCodecID sol_codec_id(int magic, int type)
int avio_r8(AVIOContext *s)
int flags
A combination of AV_PKT_FLAG values.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
static int sol_read_header(AVFormatContext *s)
const AVInputFormat ff_sol_demuxer
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
uint64_t channel_layout
Audio only.
#define MKTAG(a, b, c, d)
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Generated on Wed Aug 24 2022 21:38:27 for FFmpeg by
doxygen
1.8.17