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
|
/*
* Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <vorbis/vorbisenc.h>
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
typedef struct OggVorbisDecContext {
vorbis_info vi; /**< vorbis_info used during init */
vorbis_dsp_state vd; /**< DSP state used for analysis */
vorbis_block vb; /**< vorbis_block used for analysis */
vorbis_comment vc; /**< VorbisComment info */
ogg_packet op; /**< ogg packet */
} OggVorbisDecContext;
static int oggvorbis_decode_init(AVCodecContext *avccontext) {
OggVorbisDecContext *context = avccontext->priv_data ;
uint8_t *p= avccontext->extradata;
int i, hsizes[3];
unsigned char *headers[3], *extradata = avccontext->extradata;
vorbis_info_init(&context->vi) ;
vorbis_comment_init(&context->vc) ;
if(! avccontext->extradata_size || ! p) {
av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
return -1;
}
if(p[0] == 0 && p[1] == 30) {
for(i = 0; i < 3; i++){
hsizes[i] = bytestream_get_be16((const uint8_t **)&p);
headers[i] = p;
p += hsizes[i];
}
} else if(*p == 2) {
unsigned int offset = 1;
p++;
for(i=0; i<2; i++) {
hsizes[i] = 0;
while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
hsizes[i] += 0xFF;
offset++;
p++;
}
if(offset >= avccontext->extradata_size - 1) {
av_log(avccontext, AV_LOG_ERROR,
"vorbis header sizes damaged\n");
return -1;
}
hsizes[i] += *p;
offset++;
p++;
}
hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
#if 0
av_log(avccontext, AV_LOG_DEBUG,
"vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
#endif
headers[0] = extradata + offset;
headers[1] = extradata + offset + hsizes[0];
headers[2] = extradata + offset + hsizes[0] + hsizes[1];
} else {
av_log(avccontext, AV_LOG_ERROR,
"vorbis initial header len is wrong: %d\n", *p);
return -1;
}
for(i=0; i<3; i++){
context->op.b_o_s= i==0;
context->op.bytes = hsizes[i];
context->op.packet = headers[i];
if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
return -1;
}
}
avccontext->channels = context->vi.channels;
avccontext->sample_rate = context->vi.rate;
avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
avccontext->time_base= (AVRational){1, avccontext->sample_rate};
vorbis_synthesis_init(&context->vd, &context->vi);
vorbis_block_init(&context->vd, &context->vb);
return 0 ;
}
static inline int conv(int samples, float **pcm, char *buf, int channels) {
int i, j;
ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
float *mono ;
for(i = 0 ; i < channels ; i++){
ptr = &data[i];
mono = pcm[i] ;
for(j = 0 ; j < samples ; j++) {
*ptr = av_clip_int16(mono[j] * 32767.f);
ptr += channels;
}
}
return 0 ;
}
static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
OggVorbisDecContext *context = avccontext->priv_data ;
AVFrame *frame = data;
float **pcm ;
ogg_packet *op= &context->op;
int samples, total_samples, total_bytes;
int ret;
int16_t *output;
if(!avpkt->size){
//FIXME flush
return 0;
}
frame->nb_samples = 8192*4;
if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0)
return ret;
output = (int16_t *)frame->data[0];
op->packet = avpkt->data;
op->bytes = avpkt->size;
// av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate);
/* for(i=0; i<op->bytes; i++)
av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
av_log(avccontext, AV_LOG_DEBUG, "\n");*/
if(vorbis_synthesis(&context->vb, op) == 0)
vorbis_synthesis_blockin(&context->vd, &context->vb) ;
total_samples = 0 ;
total_bytes = 0 ;
while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ;
total_bytes += samples * 2 * context->vi.channels ;
total_samples += samples ;
vorbis_synthesis_read(&context->vd, samples) ;
}
frame->nb_samples = total_samples;
*got_frame_ptr = total_samples > 0;
return avpkt->size;
}
static int oggvorbis_decode_close(AVCodecContext *avccontext) {
OggVorbisDecContext *context = avccontext->priv_data ;
vorbis_info_clear(&context->vi) ;
vorbis_comment_clear(&context->vc) ;
return 0 ;
}
AVCodec ff_libvorbis_decoder = {
.name = "libvorbis",
.long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_VORBIS,
.priv_data_size = sizeof(OggVorbisDecContext),
.init = oggvorbis_decode_init,
.decode = oggvorbis_decode_frame,
.close = oggvorbis_decode_close,
.capabilities = CODEC_CAP_DELAY,
};
|
