Statistics
| Branch: | Revision:

ffmpeg / libavcodec / libvorbis.c @ 9c8f0768

History | View | Annotate | Download (7.27 KB)

1
/*
2
 * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
/**
22
 * @file oggvorbis.c
23
 * Ogg Vorbis codec support via libvorbisenc.
24
 * @author Mark Hills <mark@pogo.org.uk>
25
 */
26

    
27
#include <vorbis/vorbisenc.h>
28

    
29
#include "avcodec.h"
30
#include "bytestream.h"
31

    
32
#undef NDEBUG
33
#include <assert.h>
34

    
35
#define OGGVORBIS_FRAME_SIZE 64
36

    
37
#define BUFFER_SIZE (1024*64)
38

    
39
typedef struct OggVorbisContext {
40
    vorbis_info vi ;
41
    vorbis_dsp_state vd ;
42
    vorbis_block vb ;
43
    uint8_t buffer[BUFFER_SIZE];
44
    int buffer_index;
45
    int eof;
46

    
47
    /* decoder */
48
    vorbis_comment vc ;
49
    ogg_packet op;
50
} OggVorbisContext ;
51

    
52

    
53
static int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
54
    double cfreq;
55

    
56
    if(avccontext->flags & CODEC_FLAG_QSCALE) {
57
        /* variable bitrate */
58
        if(vorbis_encode_setup_vbr(vi, avccontext->channels,
59
                avccontext->sample_rate,
60
                avccontext->global_quality / (float)FF_QP2LAMBDA))
61
            return -1;
62
    } else {
63
        /* constant bitrate */
64
        if(vorbis_encode_setup_managed(vi, avccontext->channels,
65
                avccontext->sample_rate, -1, avccontext->bit_rate, -1))
66
            return -1;
67

    
68
#ifdef OGGVORBIS_VBR_BY_ESTIMATE
69
        /* variable bitrate by estimate */
70
        if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
71
            return -1;
72
#endif
73
    }
74

    
75
    /* cutoff frequency */
76
    if(avccontext->cutoff > 0) {
77
        cfreq = avccontext->cutoff / 1000.0;
78
        if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
79
            return -1;
80
    }
81

    
82
    return vorbis_encode_setup_init(vi);
83
}
84

    
85
static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
86
    OggVorbisContext *context = avccontext->priv_data ;
87
    ogg_packet header, header_comm, header_code;
88
    uint8_t *p;
89
    unsigned int offset, len;
90

    
91
    vorbis_info_init(&context->vi) ;
92
    if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
93
        av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
94
        return -1 ;
95
    }
96
    vorbis_analysis_init(&context->vd, &context->vi) ;
97
    vorbis_block_init(&context->vd, &context->vb) ;
98

    
99
    vorbis_comment_init(&context->vc);
100
    vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
101

    
102
    vorbis_analysis_headerout(&context->vd, &context->vc, &header,
103
                                &header_comm, &header_code);
104

    
105
    len = header.bytes + header_comm.bytes +  header_code.bytes;
106
    avccontext->extradata_size= 64 + len + len/255;
107
    p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
108
    p[0] = 2;
109
    offset = 1;
110
    offset += av_xiphlacing(&p[offset], header.bytes);
111
    offset += av_xiphlacing(&p[offset], header_comm.bytes);
112
    memcpy(&p[offset], header.packet, header.bytes);
113
    offset += header.bytes;
114
    memcpy(&p[offset], header_comm.packet, header_comm.bytes);
115
    offset += header_comm.bytes;
116
    memcpy(&p[offset], header_code.packet, header_code.bytes);
117
    offset += header_code.bytes;
118
    avccontext->extradata_size = offset;
119
    avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
120

    
121
/*    vorbis_block_clear(&context->vb);
122
    vorbis_dsp_clear(&context->vd);
123
    vorbis_info_clear(&context->vi);*/
124
    vorbis_comment_clear(&context->vc);
125

    
126
    avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
127

    
128
    avccontext->coded_frame= avcodec_alloc_frame();
129
    avccontext->coded_frame->key_frame= 1;
130

    
131
    return 0 ;
132
}
133

    
134

    
135
static int oggvorbis_encode_frame(AVCodecContext *avccontext,
136
                                  unsigned char *packets,
137
                           int buf_size, void *data)
138
{
139
    OggVorbisContext *context = avccontext->priv_data ;
140
    ogg_packet op ;
141
    signed short *audio = data ;
142
    int l;
143

    
144
    if(data) {
145
        int samples = OGGVORBIS_FRAME_SIZE;
146
        float **buffer ;
147

    
148
    buffer = vorbis_analysis_buffer(&context->vd, samples) ;
149

    
150
    if(context->vi.channels == 1) {
151
        for(l = 0 ; l < samples ; l++)
152
            buffer[0][l]=audio[l]/32768.f;
153
    } else {
154
        for(l = 0 ; l < samples ; l++){
155
            buffer[0][l]=audio[l*2]/32768.f;
156
            buffer[1][l]=audio[l*2+1]/32768.f;
157
        }
158
    }
159

    
160
    vorbis_analysis_wrote(&context->vd, samples) ;
161
    } else {
162
        if(!context->eof)
163
            vorbis_analysis_wrote(&context->vd, 0) ;
164
        context->eof = 1;
165
    }
166

    
167
    while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
168
        vorbis_analysis(&context->vb, NULL);
169
        vorbis_bitrate_addblock(&context->vb) ;
170

    
171
        while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
172
            /* i'd love to say the following line is a hack, but sadly it's
173
             * not, apparently the end of stream decision is in libogg. */
174
            if(op.bytes==1)
175
                continue;
176
            memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
177
            context->buffer_index += sizeof(ogg_packet);
178
            memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
179
            context->buffer_index += op.bytes;
180
//            av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
181
        }
182
    }
183

    
184
    l=0;
185
    if(context->buffer_index){
186
        ogg_packet *op2= (ogg_packet*)context->buffer;
187
        op2->packet = context->buffer + sizeof(ogg_packet);
188

    
189
        l=  op2->bytes;
190
        avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
191
        //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
192

    
193
        memcpy(packets, op2->packet, l);
194
        context->buffer_index -= l + sizeof(ogg_packet);
195
        memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
196
//        av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
197
    }
198

    
199
    return l;
200
}
201

    
202

    
203
static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
204
    OggVorbisContext *context = avccontext->priv_data ;
205
/*  ogg_packet op ; */
206

    
207
    vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
208

    
209
    vorbis_block_clear(&context->vb);
210
    vorbis_dsp_clear(&context->vd);
211
    vorbis_info_clear(&context->vi);
212

    
213
    av_freep(&avccontext->coded_frame);
214
    av_freep(&avccontext->extradata);
215

    
216
    return 0 ;
217
}
218

    
219

    
220
AVCodec libvorbis_encoder = {
221
    "libvorbis",
222
    CODEC_TYPE_AUDIO,
223
    CODEC_ID_VORBIS,
224
    sizeof(OggVorbisContext),
225
    oggvorbis_encode_init,
226
    oggvorbis_encode_frame,
227
    oggvorbis_encode_close,
228
    .capabilities= CODEC_CAP_DELAY,
229
    .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
230
    .long_name= NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
231
} ;