forked from nareix/joy4
/
flv.go
494 lines (427 loc) · 10.6 KB
/
flv.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
package flv
import (
"bufio"
"fmt"
"github.com/nareix/joy4/utils/bits/pio"
"github.com/nareix/joy4/av"
"github.com/nareix/joy4/av/avutil"
"github.com/nareix/joy4/codec"
"github.com/nareix/joy4/codec/aacparser"
"github.com/nareix/joy4/codec/fake"
"github.com/nareix/joy4/codec/h264parser"
"github.com/nareix/joy4/format/flv/flvio"
"io"
)
var MaxProbePacketCount = 20
func NewMetadataByStreams(streams []av.CodecData) (metadata flvio.AMFMap, err error) {
metadata = flvio.AMFMap{}
for _, _stream := range streams {
typ := _stream.Type()
switch {
case typ.IsVideo():
stream := _stream.(av.VideoCodecData)
switch typ {
case av.H264:
metadata["videocodecid"] = flvio.VIDEO_H264
default:
err = fmt.Errorf("flv: metadata: unsupported video codecType=%v", stream.Type())
return
}
metadata["width"] = stream.Width()
metadata["height"] = stream.Height()
metadata["displayWidth"] = stream.Width()
metadata["displayHeight"] = stream.Height()
case typ.IsAudio():
stream := _stream.(av.AudioCodecData)
switch typ {
case av.AAC:
metadata["audiocodecid"] = flvio.SOUND_AAC
case av.SPEEX:
metadata["audiocodecid"] = flvio.SOUND_SPEEX
default:
err = fmt.Errorf("flv: metadata: unsupported audio codecType=%v", stream.Type())
return
}
metadata["audiosamplerate"] = stream.SampleRate()
}
}
return
}
type Prober struct {
HasAudio, HasVideo bool
GotAudio, GotVideo bool
VideoStreamIdx, AudioStreamIdx int
PushedCount int
Streams []av.CodecData
CachedPkts []av.Packet
}
func (self *Prober) CacheTag(_tag flvio.Tag, timestamp int32) {
pkt, _ := self.TagToPacket(_tag, timestamp)
self.CachedPkts = append(self.CachedPkts, pkt)
}
func (self *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
self.PushedCount++
if self.PushedCount > MaxProbePacketCount {
err = fmt.Errorf("flv: max probe packet count reached")
return
}
switch tag.Type {
case flvio.TAG_VIDEO:
switch tag.AVCPacketType {
case flvio.AVC_SEQHDR:
if !self.GotVideo {
var stream h264parser.CodecData
if stream, err = h264parser.NewCodecDataFromAVCDecoderConfRecord(tag.Data); err != nil {
err = fmt.Errorf("flv: h264 seqhdr invalid")
return
}
self.VideoStreamIdx = len(self.Streams)
self.Streams = append(self.Streams, stream)
self.GotVideo = true
}
case flvio.AVC_NALU:
self.CacheTag(tag, timestamp)
}
case flvio.TAG_AUDIO:
switch tag.SoundFormat {
case flvio.SOUND_AAC:
switch tag.AACPacketType {
case flvio.AAC_SEQHDR:
if !self.GotAudio {
var stream aacparser.CodecData
if stream, err = aacparser.NewCodecDataFromMPEG4AudioConfigBytes(tag.Data); err != nil {
err = fmt.Errorf("flv: aac seqhdr invalid")
return
}
self.AudioStreamIdx = len(self.Streams)
self.Streams = append(self.Streams, stream)
self.GotAudio = true
}
case flvio.AAC_RAW:
self.CacheTag(tag, timestamp)
}
case flvio.SOUND_SPEEX:
if !self.GotAudio {
stream := codec.NewSpeexCodecData(16000, tag.ChannelLayout())
self.AudioStreamIdx = len(self.Streams)
self.Streams = append(self.Streams, stream)
self.GotAudio = true
self.CacheTag(tag, timestamp)
}
case flvio.SOUND_NELLYMOSER:
if !self.GotAudio {
stream := fake.CodecData{
CodecType_: av.NELLYMOSER,
SampleRate_: 16000,
SampleFormat_: av.S16,
ChannelLayout_: tag.ChannelLayout(),
}
self.AudioStreamIdx = len(self.Streams)
self.Streams = append(self.Streams, stream)
self.GotAudio = true
self.CacheTag(tag, timestamp)
}
}
}
return
}
func (self *Prober) Probed() (ok bool) {
if self.HasAudio || self.HasVideo {
if self.HasAudio == self.GotAudio && self.HasVideo == self.GotVideo {
return true
}
} else {
if self.PushedCount == MaxProbePacketCount {
return true
}
}
return
}
func (self *Prober) TagToPacket(tag flvio.Tag, timestamp int32) (pkt av.Packet, ok bool) {
switch tag.Type {
case flvio.TAG_VIDEO:
pkt.Idx = int8(self.VideoStreamIdx)
switch tag.AVCPacketType {
case flvio.AVC_NALU:
ok = true
pkt.Data = tag.Data
pkt.CompositionTime = flvio.TsToTime(tag.CompositionTime)
pkt.IsKeyFrame = tag.FrameType == flvio.FRAME_KEY
}
case flvio.TAG_AUDIO:
pkt.Idx = int8(self.AudioStreamIdx)
switch tag.SoundFormat {
case flvio.SOUND_AAC:
switch tag.AACPacketType {
case flvio.AAC_RAW:
ok = true
pkt.Data = tag.Data
}
case flvio.SOUND_SPEEX:
ok = true
pkt.Data = tag.Data
case flvio.SOUND_NELLYMOSER:
ok = true
pkt.Data = tag.Data
}
}
pkt.Time = flvio.TsToTime(timestamp)
return
}
func (self *Prober) Empty() bool {
return len(self.CachedPkts) == 0
}
func (self *Prober) PopPacket() av.Packet {
pkt := self.CachedPkts[0]
self.CachedPkts = self.CachedPkts[1:]
return pkt
}
func CodecDataToTag(stream av.CodecData) (_tag flvio.Tag, ok bool, err error) {
switch stream.Type() {
case av.H264:
h264 := stream.(h264parser.CodecData)
tag := flvio.Tag{
Type: flvio.TAG_VIDEO,
AVCPacketType: flvio.AVC_SEQHDR,
CodecID: flvio.VIDEO_H264,
Data: h264.AVCDecoderConfRecordBytes(),
FrameType: flvio.FRAME_KEY,
}
ok = true
_tag = tag
case av.NELLYMOSER:
case av.SPEEX:
case av.AAC:
aac := stream.(aacparser.CodecData)
tag := flvio.Tag{
Type: flvio.TAG_AUDIO,
SoundFormat: flvio.SOUND_AAC,
SoundRate: flvio.SOUND_44Khz,
AACPacketType: flvio.AAC_SEQHDR,
Data: aac.MPEG4AudioConfigBytes(),
}
switch aac.SampleFormat().BytesPerSample() {
case 1:
tag.SoundSize = flvio.SOUND_8BIT
default:
tag.SoundSize = flvio.SOUND_16BIT
}
switch aac.ChannelLayout().Count() {
case 1:
tag.SoundType = flvio.SOUND_MONO
case 2:
tag.SoundType = flvio.SOUND_STEREO
}
ok = true
_tag = tag
default:
err = fmt.Errorf("flv: unspported codecType=%v", stream.Type())
return
}
return
}
func PacketToTag(pkt av.Packet, stream av.CodecData) (tag flvio.Tag, timestamp int32) {
switch stream.Type() {
case av.H264:
tag = flvio.Tag{
Type: flvio.TAG_VIDEO,
AVCPacketType: flvio.AVC_NALU,
CodecID: flvio.VIDEO_H264,
Data: pkt.Data,
CompositionTime: flvio.TimeToTs(pkt.CompositionTime),
}
if pkt.IsKeyFrame {
tag.FrameType = flvio.FRAME_KEY
} else {
tag.FrameType = flvio.FRAME_INTER
}
case av.AAC:
tag = flvio.Tag{
Type: flvio.TAG_AUDIO,
SoundFormat: flvio.SOUND_AAC,
SoundRate: flvio.SOUND_44Khz,
AACPacketType: flvio.AAC_RAW,
Data: pkt.Data,
}
astream := stream.(av.AudioCodecData)
switch astream.SampleFormat().BytesPerSample() {
case 1:
tag.SoundSize = flvio.SOUND_8BIT
default:
tag.SoundSize = flvio.SOUND_16BIT
}
switch astream.ChannelLayout().Count() {
case 1:
tag.SoundType = flvio.SOUND_MONO
case 2:
tag.SoundType = flvio.SOUND_STEREO
}
case av.SPEEX:
tag = flvio.Tag{
Type: flvio.TAG_AUDIO,
SoundFormat: flvio.SOUND_SPEEX,
Data: pkt.Data,
}
case av.NELLYMOSER:
tag = flvio.Tag{
Type: flvio.TAG_AUDIO,
SoundFormat: flvio.SOUND_NELLYMOSER,
Data: pkt.Data,
}
}
timestamp = flvio.TimeToTs(pkt.Time)
return
}
type Muxer struct {
bufw writeFlusher
b []byte
streams []av.CodecData
}
type writeFlusher interface {
io.Writer
Flush() error
}
func NewMuxerWriteFlusher(w writeFlusher) *Muxer {
return &Muxer{
bufw: w,
b: make([]byte, 256),
}
}
func NewMuxer(w io.Writer) *Muxer {
return NewMuxerWriteFlusher(bufio.NewWriterSize(w, pio.RecommendBufioSize))
}
var CodecTypes = []av.CodecType{av.H264, av.AAC, av.SPEEX}
func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
var flags uint8
for _, stream := range streams {
if stream.Type().IsVideo() {
flags |= flvio.FILE_HAS_VIDEO
} else if stream.Type().IsAudio() {
flags |= flvio.FILE_HAS_AUDIO
}
}
n := flvio.FillFileHeader(self.b, flags)
if _, err = self.bufw.Write(self.b[:n]); err != nil {
return
}
for _, stream := range streams {
var tag flvio.Tag
var ok bool
if tag, ok, err = CodecDataToTag(stream); err != nil {
return
}
if ok {
if err = flvio.WriteTag(self.bufw, tag, 0, self.b); err != nil {
return
}
}
}
self.streams = streams
return
}
func (self *Muxer) WritePacket(pkt av.Packet) (err error) {
stream := self.streams[pkt.Idx]
tag, timestamp := PacketToTag(pkt, stream)
if err = flvio.WriteTag(self.bufw, tag, timestamp, self.b); err != nil {
return
}
return
}
func (self *Muxer) WriteTrailer() (err error) {
if err = self.bufw.Flush(); err != nil {
return
}
return
}
type Demuxer struct {
prober *Prober
bufr *bufio.Reader
b []byte
stage int
}
func NewDemuxer(r io.Reader) *Demuxer {
return &Demuxer{
bufr: bufio.NewReaderSize(r, pio.RecommendBufioSize),
prober: &Prober{},
b: make([]byte, 256),
}
}
func (self *Demuxer) prepare() (err error) {
for self.stage < 2 {
switch self.stage {
case 0:
if _, err = io.ReadFull(self.bufr, self.b[:flvio.FileHeaderLength]); err != nil {
return
}
var flags uint8
var skip int
if flags, skip, err = flvio.ParseFileHeader(self.b); err != nil {
return
}
if _, err = self.bufr.Discard(skip); err != nil {
return
}
if flags&flvio.FILE_HAS_AUDIO != 0 {
self.prober.HasAudio = true
}
if flags&flvio.FILE_HAS_VIDEO != 0 {
self.prober.HasVideo = true
}
self.stage++
case 1:
for !self.prober.Probed() {
var tag flvio.Tag
var timestamp int32
if tag, timestamp, err = flvio.ReadTag(self.bufr, self.b); err != nil {
return
}
if err = self.prober.PushTag(tag, timestamp); err != nil {
return
}
}
self.stage++
}
}
return
}
func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
if err = self.prepare(); err != nil {
return
}
streams = self.prober.Streams
return
}
func (self *Demuxer) ReadPacket() (pkt av.Packet, err error) {
if err = self.prepare(); err != nil {
return
}
if !self.prober.Empty() {
pkt = self.prober.PopPacket()
return
}
for {
var tag flvio.Tag
var timestamp int32
if tag, timestamp, err = flvio.ReadTag(self.bufr, self.b); err != nil {
return
}
var ok bool
if pkt, ok = self.prober.TagToPacket(tag, timestamp); ok {
return
}
}
return
}
func Handler(h *avutil.RegisterHandler) {
h.Probe = func(b []byte) bool {
return b[0] == 'F' && b[1] == 'L' && b[2] == 'V'
}
h.Ext = ".flv"
h.ReaderDemuxer = func(r io.Reader) av.Demuxer {
return NewDemuxer(r)
}
h.WriterMuxer = func(w io.Writer) av.Muxer {
return NewMuxer(w)
}
h.CodecTypes = CodecTypes
}