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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) {
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,
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) {
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:
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:
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 
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 
307  NUTContext * priv = s->priv_data;
308 
309  nut_demuxer_uninit(priv->nut);
310 
311  return 0;
312 }
313 
315  .name = "libnut",
316  .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
317  .priv_data_size = sizeof(NUTContext),
323  .extensions = "nut",
324 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2360
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:292
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2944
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1597
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:4404
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1578
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:213
int64_t(* seek)(void *opaque, int64_t offset, int whence)
Definition: avio.h:183
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:2934
static AVPacket pkt
#define ID_LENGTH
Definition: libnut.c:34
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3907
Format I/O context.
Definition: avformat.h:1319
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:3981
static int nut_read_header(AVFormatContext *avf)
Definition: libnut.c:191
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4042
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nutenc.c:962
uint8_t * data
Definition: avcodec.h:1577
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:447
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:187
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:550
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1609
#define ID_STRING
Definition: libnut.c:33
nut_stream_header_tt * s
Definition: libnut.c:38
static int nut_read_seek(AVFormatContext *avf, int stream_index, int64_t target_ts, int flags)
Definition: libnut.c:296
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
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void ff_parse_specific_params(AVStream *st, int *au_rate, int *au_ssize, int *au_scale)
Definition: riffenc.c:263
#define AVERROR(e)
Definition: error.h:43
static int nut_write_header(AVFormatContext *s)
Definition: nutenc.c:700
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int video_delay
Video only.
Definition: avcodec.h:4010
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:512
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3911
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:428
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1583
static const AVCodecTag nut_tags[]
Definition: libnut.c:41
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3933
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1375
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:207
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:3105
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:483
const char * name
Definition: avformat.h:522
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
void * buf
Definition: avisynth_c.h:553
static off_t av_seek(void *h, int64_t pos, int whence)
Definition: libnut.c:182
GLint GLenum type
Definition: opengl_enc.c:105
static size_t av_read(void *h, size_t len, uint8_t *buf)
Definition: libnut.c:177
static int nut_write_trailer(AVFormatContext *s)
Definition: nutenc.c:1183
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int nut_probe(AVProbeData *p)
Definition: libnut.c:171
static int flags
Definition: cpu.c:47
static int nut_read_close(AVFormatContext *s)
Definition: libnut.c:306
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4025
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
Main libavformat public API header.
if(ret< 0)
Definition: vf_mcdeint.c:282
void * av_realloc(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:145
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
int den
denominator
Definition: rational.h:45
AVInputFormat ff_libnut_demuxer
Definition: libnut.c:314
#define av_free(p)
int len
void * priv_data
Format private data.
Definition: avformat.h:1347
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:497
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3929
int channels
Audio only.
Definition: avcodec.h:4021
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
nut_context_tt * nut
Definition: libnut.c:37
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3919
int stream_index
Definition: avcodec.h:1579
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:913
#define MKTAG(a, b, c, d)
Definition: common.h:342
This structure stores compressed data.
Definition: avcodec.h:1554
unsigned int fourcc
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
static int nut_read_packet(AVFormatContext *avf, AVPacket *pkt)
Definition: libnut.c:273
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1570