FFmpeg  2.1.1
rawdec.c
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1 /*
2  * RAW demuxers
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2005 Alex Beregszaszi
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avformat.h"
24 #include "internal.h"
25 #include "avio_internal.h"
26 #include "rawdec.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/parseutils.h"
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/avassert.h"
31 
32 #define RAW_PACKET_SIZE 1024
33 
35 {
36  int ret, size;
37 
38  size = RAW_PACKET_SIZE;
39 
40  if (av_new_packet(pkt, size) < 0)
41  return AVERROR(ENOMEM);
42 
43  pkt->pos= avio_tell(s->pb);
44  pkt->stream_index = 0;
45  ret = ffio_read_partial(s->pb, pkt->data, size);
46  if (ret < 0) {
47  av_free_packet(pkt);
48  return ret;
49  }
50  av_shrink_packet(pkt, ret);
51  return ret;
52 }
53 
55 {
56  AVStream *st = avformat_new_stream(s, NULL);
57  if (!st)
58  return AVERROR(ENOMEM);
62  st->start_time = 0;
63  /* the parameters will be extracted from the compressed bitstream */
64 
65  return 0;
66 }
67 
68 /* MPEG-1/H.263 input */
70 {
71  AVStream *st;
73  int ret = 0;
74 
75 
76  st = avformat_new_stream(s, NULL);
77  if (!st) {
78  ret = AVERROR(ENOMEM);
79  goto fail;
80  }
81 
85 
86  st->codec->time_base = av_inv_q(s1->framerate);
87  avpriv_set_pts_info(st, 64, 1, 1200000);
88 
89 fail:
90  return ret;
91 }
92 
94 {
95  AVStream *st = avformat_new_stream(s, NULL);
96  if (!st)
97  return AVERROR(ENOMEM);
100  st->start_time = 0;
101  return 0;
102 }
103 
104 /* Note: Do not forget to add new entries to the Makefile as well. */
105 
106 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
107 #define DEC AV_OPT_FLAG_DECODING_PARAM
109  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC},
110  { NULL },
111 };
112 
113 #if CONFIG_DATA_DEMUXER
114 AVInputFormat ff_data_demuxer = {
115  .name = "data",
116  .long_name = NULL_IF_CONFIG_SMALL("raw data"),
117  .read_header = ff_raw_data_read_header,
118  .read_packet = ff_raw_read_partial_packet,
119  .raw_codec_id = AV_CODEC_ID_NONE,
120 };
121 #endif
122 
123 #if CONFIG_LATM_DEMUXER
124 AVInputFormat ff_latm_demuxer = {
125  .name = "latm",
126  .long_name = NULL_IF_CONFIG_SMALL("raw LOAS/LATM"),
127  .read_header = ff_raw_audio_read_header,
128  .read_packet = ff_raw_read_partial_packet,
129  .flags = AVFMT_GENERIC_INDEX,
130  .extensions = "latm",
131  .raw_codec_id = AV_CODEC_ID_AAC_LATM,
132 };
133 #endif
134 
135 #if CONFIG_MJPEG_DEMUXER
136 FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG)
137 #endif
138 
139 #if CONFIG_MLP_DEMUXER
140 AVInputFormat ff_mlp_demuxer = {
141  .name = "mlp",
142  .long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
143  .read_header = ff_raw_audio_read_header,
144  .read_packet = ff_raw_read_partial_packet,
145  .flags = AVFMT_GENERIC_INDEX,
146  .extensions = "mlp",
147  .raw_codec_id = AV_CODEC_ID_MLP,
148 };
149 #endif
150 
151 #if CONFIG_TRUEHD_DEMUXER
152 AVInputFormat ff_truehd_demuxer = {
153  .name = "truehd",
154  .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
155  .read_header = ff_raw_audio_read_header,
156  .read_packet = ff_raw_read_partial_packet,
157  .flags = AVFMT_GENERIC_INDEX,
158  .extensions = "thd",
159  .raw_codec_id = AV_CODEC_ID_TRUEHD,
160 };
161 #endif
162 
163 #if CONFIG_SHORTEN_DEMUXER
164 AVInputFormat ff_shorten_demuxer = {
165  .name = "shn",
166  .long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
167  .read_header = ff_raw_audio_read_header,
168  .read_packet = ff_raw_read_partial_packet,
170  .extensions = "shn",
171  .raw_codec_id = AV_CODEC_ID_SHORTEN,
172 };
173 #endif
174 
175 #if CONFIG_VC1_DEMUXER
176 FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", AV_CODEC_ID_VC1)
177 #endif
const AVOption ff_rawvideo_options[]
Definition: rawdec.c:108
const char * s
Definition: avisynth_c.h:668
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:279
AVOption.
Definition: opt.h:253
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1092
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:103
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:3922
#define FF_DEF_RAWVIDEO_DEMUXER(shortname, longname, probe, ext, id)
Definition: rawdec.h:52
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1265
Format I/O context.
Definition: avformat.h:968
enum AVStreamParseType need_parsing
Definition: avformat.h:812
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:361
void * priv_data
Format private data.
Definition: avformat.h:988
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:34
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
struct AVInputFormat * iformat
Can only be iformat or oformat, not both at the same time.
Definition: avformat.h:981
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:540
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:355
goto fail
Definition: avfilter.c:963
Opaque data information usually continuous.
Definition: avcodec.h:2233
ret
Definition: avfilter.c:961
int ff_raw_audio_read_header(AVFormatContext *s)
Definition: rawdec.c:54
#define RAW_PACKET_SIZE
Definition: rawdec.c:32
#define OFFSET(x)
Definition: rawdec.c:106
Stream structure.
Definition: avformat.h:667
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
uint8_t * data
Definition: avcodec.h:1063
offset must point to AVRational
Definition: opt.h:233
#define s1
Definition: regdef.h:38
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:517
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:122
static int ff_raw_data_read_header(AVFormatContext *s)
Definition: rawdec.c:93
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:713
Main libavformat public API header.
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:603
AVRational framerate
AVRational describing framerate, set by a private option.
Definition: rawdec.h:33
#define AVERROR(e)
#define DEC
Definition: rawdec.c:107
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:362
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
int ff_raw_video_read_header(AVFormatContext *s)
Definition: rawdec.c:69
This structure stores compressed data.
Definition: avcodec.h:1040
#define AVFMT_NOBINSEARCH
Format does not allow to fall back on binary search via read_timestamp.
Definition: avformat.h:360