FFmpeg: libavformat/dsicin.c Source File
Go to the documentation of this file. 1 /*
2 * Delphine Software International CIN File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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 * @file
24 * Delphine Software International CIN file demuxer
25 */
26
33
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52
62
63
65 {
66 /* header starts with this special marker */
67 if (
AV_RL32(&
p->buf[0]) != 0x55AA0000)
68 return 0;
69
70 /* for accuracy, check some header field values */
71 if (
AV_RL32(&
p->buf[12]) != 22050 ||
p->buf[16] != 16 ||
p->buf[17] != 0)
72 return 0;
73
75 }
76
79
82
90
93
94 return 0;
95 }
96
98 {
99 int rc;
104
106 if (rc)
107 return rc;
108
112
113 /* initialize the video decoder stream */
115 if (!st)
117
125
126 /* initialize the audio decoder stream */
128 if (!st)
130
142
143 return 0;
144 }
145
148
154
157
162
163 return 0;
164 }
165
167 {
171 int rc, palette_type;
174
177 if (rc)
178 return rc;
179
182 palette_type = 1;
183 } else {
184 palette_type = 0;
185 }
186
187 /* palette and video packet */
189 if (pkt_size + 4 > INT_MAX)
191
193
197
200
205
209 }
212
213 /* sound buffer will be processed on next read_packet() call */
215 return 0;
216 }
217
218 /* audio packet */
222
228 return 0;
229 }
230
238 };
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.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
int error
contains the error code or 0 if no error happened
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.
@ AV_CODEC_ID_DSICINVIDEO
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
CinFrameHeader frame_header
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
const FFInputFormat ff_dsicin_demuxer
unsigned int avio_rl16(AVIOContext *s)
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
@ AV_CODEC_ID_DSICINAUDIO
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
This structure contains the data a format has to probe a file.
CinFileHeader file_header
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
An AVChannelLayout holds information about the channel layout of audio data.
int avio_r8(AVIOContext *s)
static int read_header(FFV1Context *f, RangeCoder *c)
static int cin_probe(const AVProbeData *p)
int ffio_limit(AVIOContext *s, int size)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
static int cin_read_header(AVFormatContext *s)
static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int index
stream index in AVFormatContext
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb)
IDirect3DDxgiInterfaceAccess _COM_Outptr_ void ** p
static int read_probe(const AVProbeData *p)
int bits_per_coded_sample
The number of bits per sample in the codedwords.
#define AV_CHANNEL_LAYOUT_MONO
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
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