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
|
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include "config.h"
#include "m_option.h"
#include "mp_msg.h"
#include "libmpdemux/aviheader.h"
#include "libmpdemux/ms_hdr.h"
#include "stream/stream.h"
#include "libmpdemux/muxer.h"
#include "ae_lavc.h"
#include "help_mp.h"
#include "libaf/af_format.h"
#include "libaf/reorder_ch.h"
#include "libavcodec/avcodec.h"
#include "libavutil/intreadwrite.h"
static AVCodec *lavc_acodec;
static AVCodecContext *lavc_actx;
extern char *lavc_param_acodec;
extern int lavc_param_abitrate;
extern int lavc_param_atag;
extern int lavc_param_audio_global_header;
extern int avcodec_initialized;
static int compressed_frame_size = 0;
#ifdef CONFIG_LIBAVFORMAT
#include "libavformat/avformat.h"
extern const struct AVCodecTag *mp_wav_taglists[];
#endif
static int bind_lavc(audio_encoder_t *encoder, muxer_stream_t *mux_a)
{
mux_a->wf = malloc(sizeof(WAVEFORMATEX)+lavc_actx->extradata_size+256);
mux_a->wf->wFormatTag = lavc_param_atag;
mux_a->wf->nChannels = lavc_actx->channels;
mux_a->wf->nSamplesPerSec = lavc_actx->sample_rate;
mux_a->wf->nAvgBytesPerSec = (lavc_actx->bit_rate / 8);
mux_a->avg_rate= lavc_actx->bit_rate;
mux_a->h.dwRate = mux_a->wf->nAvgBytesPerSec;
if(lavc_actx->block_align)
mux_a->h.dwSampleSize = mux_a->h.dwScale = lavc_actx->block_align;
else
{
mux_a->h.dwScale = (mux_a->wf->nAvgBytesPerSec * lavc_actx->frame_size)/ mux_a->wf->nSamplesPerSec; /* for cbr */
if ((mux_a->wf->nAvgBytesPerSec *
lavc_actx->frame_size) % mux_a->wf->nSamplesPerSec)
{
mux_a->h.dwScale = lavc_actx->frame_size;
mux_a->h.dwRate = lavc_actx->sample_rate;
mux_a->h.dwSampleSize = 0; // Blocksize not constant
}
else
mux_a->h.dwSampleSize = 0;
}
if(mux_a->h.dwSampleSize)
mux_a->wf->nBlockAlign = mux_a->h.dwSampleSize;
else
mux_a->wf->nBlockAlign = 1;
mux_a->h.dwSuggestedBufferSize = (encoder->params.audio_preload*mux_a->wf->nAvgBytesPerSec)/1000;
mux_a->h.dwSuggestedBufferSize -= mux_a->h.dwSuggestedBufferSize % mux_a->wf->nBlockAlign;
switch(lavc_param_atag)
{
case 0x11: /* imaadpcm */
mux_a->wf->wBitsPerSample = 4;
mux_a->wf->cbSize = 2;
AV_WL16(mux_a->wf+1, lavc_actx->frame_size);
break;
case 0x55: /* mp3 */
mux_a->wf->cbSize = 12;
mux_a->wf->wBitsPerSample = 0; /* does not apply */
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->wID = 1;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->fdwFlags = 2;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nBlockSize = mux_a->wf->nBlockAlign;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nFramesPerBlock = 1;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nCodecDelay = 0;
break;
default:
mux_a->wf->wBitsPerSample = 0; /* Unknown */
if (lavc_actx->extradata && (lavc_actx->extradata_size > 0))
{
memcpy(mux_a->wf+1, lavc_actx->extradata, lavc_actx->extradata_size);
mux_a->wf->cbSize = lavc_actx->extradata_size;
}
else
mux_a->wf->cbSize = 0;
break;
}
// Fix allocation
mux_a->wf = realloc(mux_a->wf, sizeof(WAVEFORMATEX)+mux_a->wf->cbSize);
encoder->input_format = AF_FORMAT_S16_NE;
encoder->min_buffer_size = mux_a->h.dwSuggestedBufferSize;
encoder->max_buffer_size = mux_a->h.dwSuggestedBufferSize*2;
return 1;
}
static int encode_lavc(audio_encoder_t *encoder, uint8_t *dest, void *src, int size, int max_size)
{
int n;
if ((encoder->params.channels == 6 || encoder->params.channels == 5) &&
(!strcmp(lavc_acodec->name,"ac3") ||
!strcmp(lavc_acodec->name,"libfaac"))) {
int isac3 = !strcmp(lavc_acodec->name,"ac3");
reorder_channel_nch(src, AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
isac3 ? AF_CHANNEL_LAYOUT_LAVC_DEFAULT
: AF_CHANNEL_LAYOUT_AAC_DEFAULT,
encoder->params.channels,
size / 2, 2);
}
n = avcodec_encode_audio(lavc_actx, dest, size, src);
compressed_frame_size = n;
return n;
}
static int close_lavc(audio_encoder_t *encoder)
{
compressed_frame_size = 0;
return 1;
}
static int get_frame_size(audio_encoder_t *encoder)
{
int sz = compressed_frame_size;
compressed_frame_size = 0;
return sz;
}
#ifndef CONFIG_LIBAVFORMAT
static uint32_t lavc_find_atag(char *codec)
{
if(codec == NULL)
return 0;
if(! strcasecmp(codec, "mp2"))
return 0x50;
if(! strcasecmp(codec, "mp3"))
return 0x55;
if(! strcasecmp(codec, "ac3"))
return 0x2000;
if(! strcasecmp(codec, "adpcm_ima_wav"))
return 0x11;
if(! strncasecmp(codec, "bonk", 4))
return 0x2048;
return 0;
}
#endif
int mpae_init_lavc(audio_encoder_t *encoder)
{
encoder->params.samples_per_frame = encoder->params.sample_rate;
encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
if(!lavc_param_acodec)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_NoLavcAudioCodecName);
return 0;
}
if(!avcodec_initialized){
avcodec_init();
avcodec_register_all();
avcodec_initialized=1;
}
lavc_acodec = avcodec_find_encoder_by_name(lavc_param_acodec);
if (!lavc_acodec)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_LavcAudioCodecNotFound, lavc_param_acodec);
return 0;
}
if(lavc_param_atag == 0)
{
#ifdef CONFIG_LIBAVFORMAT
lavc_param_atag = av_codec_get_tag(mp_wav_taglists, lavc_acodec->id);
#else
lavc_param_atag = lavc_find_atag(lavc_param_acodec);
#endif
if(!lavc_param_atag)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, "Couldn't find wav tag for specified codec, exit\n");
return 0;
}
}
lavc_actx = avcodec_alloc_context();
if(lavc_actx == NULL)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntAllocateLavcContext);
return 0;
}
lavc_actx->codec_type = CODEC_TYPE_AUDIO;
lavc_actx->codec_id = lavc_acodec->id;
// put sample parameters
lavc_actx->channels = encoder->params.channels;
lavc_actx->sample_rate = encoder->params.sample_rate;
lavc_actx->time_base.num = 1;
lavc_actx->time_base.den = encoder->params.sample_rate;
if(lavc_param_abitrate<1000)
lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate * 1000;
else
lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate;
/*
* Special case for adpcm_ima_wav.
* The bitrate is only dependent on samplerate.
* We have to known frame_size and block_align in advance,
* so I just copied the code from libavcodec/adpcm.c
*
* However, ms adpcm_ima_wav uses a block_align of 2048,
* lavc defaults to 1024
*/
if(lavc_param_atag == 0x11) {
int blkalign = 2048;
int framesize = (blkalign - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
lavc_actx->bit_rate = lavc_actx->sample_rate*8*blkalign/framesize;
}
if((lavc_param_audio_global_header&1)
/*|| (video_global_header==0 && (oc->oformat->flags & AVFMT_GLOBALHEADER))*/){
lavc_actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if(lavc_param_audio_global_header&2){
lavc_actx->flags2 |= CODEC_FLAG2_LOCAL_HEADER;
}
if(avcodec_open(lavc_actx, lavc_acodec) < 0)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntOpenCodec, lavc_param_acodec, lavc_param_abitrate);
return 0;
}
if(lavc_param_atag == 0x11) {
lavc_actx->block_align = 2048;
lavc_actx->frame_size = (lavc_actx->block_align - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
}
encoder->decode_buffer_size = lavc_actx->frame_size * 2 * encoder->params.channels;
while (encoder->decode_buffer_size < 1024) encoder->decode_buffer_size *= 2;
encoder->bind = bind_lavc;
encoder->get_frame_size = get_frame_size;
encoder->encode = encode_lavc;
encoder->close = close_lavc;
return 1;
}
|
