FFmpeg: libavformat/libnut.c Source File

FFmpeg
libnut.c
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1 /*
2  * NUT (de)muxing via libnut
3  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
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  * NUT demuxing and muxing via libnut.
25  * @author Oded Shimon <ods15@ods15.dyndns.org>
26  */
27 
28 #include "avformat.h"
29 #include "internal.h"
30 #include "riff.h"
31 #include <libnut.h>
32 
33  #define ID_STRING "nut/multimedia container"
34  #define ID_LENGTH (strlen(ID_STRING) + 1)
35 
36  typedef struct {
37   nut_context_tt * nut;
38   nut_stream_header_tt * s;
39 } NUTContext;
40 
41  static const AVCodecTag nut_tags[] = {
42  { AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
43  { AV_CODEC_ID_MP3, MKTAG('m', 'p', '3', ' ') },
44  { AV_CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
45  { 0, 0 },
46 };
47 
48 #if CONFIG_LIBNUT_MUXER
49 static int av_write(void * h, size_t len, const uint8_t * buf) {
50  AVIOContext * bc = h;
51  avio_write(bc, buf, len);
52  //avio_flush(bc);
53  return len;
54 }
55 
56 static int nut_write_header(AVFormatContext * avf) {
57  NUTContext * priv = avf->priv_data;
58  AVIOContext * bc = avf->pb;
59  nut_muxer_opts_tt mopts = {
60  .output = {
61  .priv = bc,
62  .write = av_write,
63  },
64  .alloc = { av_malloc, av_realloc, av_free },
65  .write_index = 1,
66  .realtime_stream = 0,
67  .max_distance = 32768,
68  .fti = NULL,
69  };
70  nut_stream_header_tt * s;
71  int i;
72 
73  priv->s = s = av_mallocz_array(avf->nb_streams + 1, sizeof*s);
74  if(!s)
75  return AVERROR(ENOMEM);
76 
77  for (i = 0; i < avf->nb_streams; i++) {
78  AVCodecParameters *par = avf->streams[i]->codecpar;
79  int j;
80  int fourcc = 0;
81  int num, denom, ssize;
82 
83  s[i].type = par->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
84 
85  if (par->codec_tag) fourcc = par->codec_tag;
86  else fourcc = ff_codec_get_tag(nut_tags, par->codec_id);
87 
88  if (!fourcc) {
89  if (par->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id);
90  if (par->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
91  }
92 
93  s[i].fourcc_len = 4;
94  s[i].fourcc = av_malloc(s[i].fourcc_len);
95  for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
96 
97  ff_parse_specific_params(avf->streams[i], &num, &ssize, &denom);
98  avpriv_set_pts_info(avf->streams[i], 60, denom, num);
99 
100  s[i].time_base.num = denom;
101  s[i].time_base.den = num;
102 
103  s[i].fixed_fps = 0;
104  s[i].decode_delay = par->video_delay;
105  s[i].codec_specific_len = par->extradata_size;
106  s[i].codec_specific = par->extradata;
107 
108  if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
109  s[i].width = par->width;
110  s[i].height = par->height;
111  s[i].sample_width = 0;
112  s[i].sample_height = 0;
113  s[i].colorspace_type = 0;
114  } else {
115  s[i].samplerate_num = par->sample_rate;
116  s[i].samplerate_denom = 1;
117  s[i].channel_count = par->channels;
118  }
119  }
120 
121  s[avf->nb_streams].type = -1;
122  priv->nut = nut_muxer_init(&mopts, s, NULL);
123 
124  return 0;
125 }
126 
127 static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
128  NUTContext * priv = avf->priv_data;
129  nut_packet_tt p;
130 
131  p.len = pkt->size;
132  p.stream = pkt->stream_index;
133  p.pts = pkt->pts;
134  p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
135  p.next_pts = 0;
136 
137  nut_write_frame_reorder(priv->nut, &p, pkt->data);
138 
139  return 0;
140 }
141 
142 static int nut_write_trailer(AVFormatContext * avf) {
143  AVIOContext * bc = avf->pb;
144  NUTContext * priv = avf->priv_data;
145  int i;
146 
147  nut_muxer_uninit_reorder(priv->nut);
148  avio_flush(bc);
149 
150  for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
151  av_freep(&priv->s);
152 
153  return 0;
154 }
155 
156 AVOutputFormat ff_libnut_muxer = {
157  .name = "libnut",
158  .long_name = "nut format",
159  .mime_type = "video/x-nut",
160  .extensions = "nut",
161  .priv_data_size = sizeof(NUTContext),
162  .audio_codec = AV_CODEC_ID_VORBIS,
163  .video_codec = AV_CODEC_ID_MPEG4,
164  .write_header = nut_write_header,
165  .write_packet = nut_write_packet,
166  .write_trailer = nut_write_trailer,
167  .flags = AVFMT_GLOBALHEADER,
168 };
169 #endif /* CONFIG_LIBNUT_MUXER */
170 
171  static int nut_probe(AVProbeData *p) {
172  if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
173 
174  return 0;
175 }
176 
177  static size_t av_read(void * h, size_t len, uint8_t * buf) {
178  AVIOContext * bc = h;
179  return avio_read(bc, buf, len);
180 }
181 
182  static off_t av_seek(void * h, int64_t pos, int whence) {
183  AVIOContext * bc = h;
184  if (whence == SEEK_END) {
185  pos = avio_size(bc) + pos;
186  whence = SEEK_SET;
187  }
188  return avio_seek(bc, pos, whence);
189 }
190 
191  static int nut_read_header(AVFormatContext * avf) {
192  NUTContext * priv = avf->priv_data;
193  AVIOContext * bc = avf->pb;
194  nut_demuxer_opts_tt dopts = {
195  .input = {
196  .priv = bc,
197  .seek = av_seek,
198  .read = av_read,
199  .eof = NULL,
200  .file_pos = 0,
201  },
202  .alloc = { av_malloc, av_realloc, av_free },
203  .read_index = 1,
204  .cache_syncpoints = 1,
205  };
206  nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
207  nut_stream_header_tt * s;
208  int ret, i;
209 
210  if(!nut)
211  return -1;
212 
213  if ((ret = nut_read_headers(nut, &s, NULL))) {
214  av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
215  nut_demuxer_uninit(nut);
216  priv->nut = NULL;
217  return -1;
218  }
219 
220  priv->s = s;
221 
222  for (i = 0; s[i].type != -1 && i < 2; i++) {
223  AVStream * st = avformat_new_stream(avf, NULL);
224  int j;
225 
226  if (!st)
227  return AVERROR(ENOMEM);
228 
229  for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codecpar->codec_tag |= s[i].fourcc[j]<<(j*8);
230 
231  st->codecpar->video_delay = s[i].decode_delay;
232 
233  st->codecpar->extradata_size = s[i].codec_specific_len;
234  if (st->codecpar->extradata_size) {
235  if(ff_alloc_extradata(st->codecpar, st->codecpar->extradata_size)){
236  nut_demuxer_uninit(nut);
237  priv->nut = NULL;
238  return AVERROR(ENOMEM);
239  }
240  memcpy(st->codecpar->extradata, s[i].codec_specific, st->codecpar->extradata_size);
241  }
242 
243  avpriv_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
244  st->start_time = 0;
245  st->duration = s[i].max_pts;
246 
247  st->codecpar->codec_id = ff_codec_get_id(nut_tags, st->codecpar->codec_tag);
248 
249  switch(s[i].type) {
250  case NUT_AUDIO_CLASS:
251  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
252  if (st->codecpar->codec_id == AV_CODEC_ID_NONE) st->codecpar->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codecpar->codec_tag);
253 
254  st->codecpar->channels = s[i].channel_count;
255  st->codecpar->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
256  break;
257  case NUT_VIDEO_CLASS:
258  st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
259  if (st->codecpar->codec_id == AV_CODEC_ID_NONE) st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codecpar->codec_tag);
260 
261  st->codecpar->width = s[i].width;
262  st->codecpar->height = s[i].height;
263  st->sample_aspect_ratio.num = s[i].sample_width;
264  st->sample_aspect_ratio.den = s[i].sample_height;
265  break;
266  }
267  if (st->codecpar->codec_id == AV_CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
268  }
269 
270  return 0;
271 }
272 
273  static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
274  NUTContext * priv = avf->priv_data;
275  nut_packet_tt pd;
276  int ret;
277 
278  ret = nut_read_next_packet(priv->nut, &pd);
279 
280  if (ret || av_new_packet(pkt, pd.len) < 0) {
281  if (ret != NUT_ERR_EOF)
282  av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
283  return -1;
284  }
285 
286  if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
287  pkt->pts = pd.pts;
288  pkt->stream_index = pd.stream;
289  pkt->pos = avio_tell(avf->pb);
290 
291  ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
292 
293  return ret;
294 }
295 
296  static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
297  NUTContext * priv = avf->priv_data;
298  int active_streams[] = { stream_index, -1 };
299  double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
300 
301  if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
302 
303  return 0;
304 }
305 
306  static int nut_read_close(AVFormatContext *s) {
307  NUTContext * priv = s->priv_data;
308 
309  nut_demuxer_uninit(priv->nut);
310 
311  return 0;
312 }
313 
314  AVInputFormat ff_libnut_demuxer = {
315  .name = "libnut",
316  .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
317  .priv_data_size = sizeof(NUTContext),
318  .read_probe = nut_probe,
319  .read_header = nut_read_header,
320  .read_packet = nut_read_packet,
321  .read_close = nut_read_close,
322  .read_seek = nut_read_seek,
323  .extensions = "nut",
324 };
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:672
AVSEEK_FLAG_BACKWARD
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2423
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:768
fourcc
uint32_t fourcc
Definition: hwcontext_qsv.c:90
AVIOContext
Bytestream IO Context.
Definition: avio.h:155
AV_CODEC_ID_NONE
Definition: avcodec.h:215
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:321
h
h
Definition: vp9dsp_template.c:2038
av_realloc
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:135
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3050
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1677
avpriv_set_pts_info
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:4601
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4066
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:959
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVPacket::size
int size
Definition: avcodec.h:1658
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
AV_CODEC_ID_MPEG4
Definition: avcodec.h:232
AVIOContext::seek
int64_t(* seek)(void *opaque, int64_t offset, int whence)
Definition: avio.h:227
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3040
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
NUTContext
Definition: libnut.c:36
ID_LENGTH
#define ID_LENGTH
Definition: libnut.c:34
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: avcodec.h:4058
AVFormatContext
Format I/O context.
Definition: avformat.h:1349
uint8_t
uint8_t
Definition: audio_convert.c:194
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVCodecParameters::width
int width
Video only.
Definition: avcodec.h:4132
nut_read_header
static int nut_read_header(AVFormatContext *avf)
Definition: libnut.c:191
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4231
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
nut_write_packet
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nutenc.c:943
AVPacket::data
uint8_t * data
Definition: avcodec.h:1657
flags
static int flags
Definition: log.c:57
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:525
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:205
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1689
ID_STRING
#define ID_STRING
Definition: libnut.c:33
NUTContext::s
nut_stream_header_tt * s
Definition: libnut.c:38
nut_read_seek
static int nut_read_seek(AVFormatContext *avf, int stream_index, int64_t target_ts, int flags)
Definition: libnut.c:296
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
ff_parse_specific_params
void ff_parse_specific_params(AVStream *st, int *au_rate, int *au_ssize, int *au_scale)
Definition: riffenc.c:265
AVERROR
#define AVERROR(e)
Definition: error.h:43
nut_write_header
static int nut_write_header(AVFormatContext *s)
Definition: nutenc.c:681
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
AVCodecParameters::video_delay
int video_delay
Video only.
Definition: avcodec.h:4161
AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:550
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4062
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ff_codec_wav_tags
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:458
av_mallocz_array
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1663
nut_tags
static const AVCodecTag nut_tags[]
Definition: libnut.c:41
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4084
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
avio_flush
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:225
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3213
ff_codec_bmp_tags
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
read_probe
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
AVFMT_GLOBALHEADER
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:485
AVOutputFormat::name
const char * name
Definition: avformat.h:524
riff.h
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:510
AVStream
Stream structure.
Definition: avformat.h:889
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
buf
void * buf
Definition: avisynth_c.h:690
av_seek
static off_t av_seek(void *h, int64_t pos, int whence)
Definition: libnut.c:182
type
GLint GLenum type
Definition: opengl_enc.c:105
av_read
static size_t av_read(void *h, size_t len, uint8_t *buf)
Definition: libnut.c:177
nut_write_trailer
static int nut_write_trailer(AVFormatContext *s)
Definition: nutenc.c:1164
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
nut_probe
static int nut_probe(AVProbeData *p)
Definition: libnut.c:171
nut_read_close
static int nut_read_close(AVFormatContext *s)
Definition: libnut.c:306
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:946
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:4176
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
avformat.h
Main libavformat public API header.
if
if(ret< 0)
Definition: vf_mcdeint.c:282
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:936
AVRational::den
int den
Denominator.
Definition: rational.h:60
ff_libnut_demuxer
AVInputFormat ff_libnut_demuxer
Definition: libnut.c:314
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
len
int len
Definition: vorbis_enc_data.h:452
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1377
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4080
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:4172
NUTContext::nut
nut_context_tt * nut
Definition: libnut.c:37
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVStream::codecpar
AVCodecParameters * codecpar
Definition: avformat.h:1252
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4070
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1659
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:926
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1634
nut_read_packet
static int nut_read_packet(AVFormatContext *avf, AVPacket *pkt)
Definition: libnut.c:273
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1650
AV_CODEC_ID_VORBIS
Definition: avcodec.h:554
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