aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/ogg.c
blob: c98bb2273594b1f58a3a6f9265236ab5b76b4900 (plain) (blame)
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
/*
 * Ogg bitstream support
 * Mark Hills <mark@pogo.org.uk>
 *
 * Uses libogg, but requires libvorbisenc to construct correct headers
 * when containing Vorbis stream -- currently the only format supported
 *
 * 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 <stdio.h>

#include <ogg/ogg.h>

#include "avformat.h"

#undef NDEBUG
#include <assert.h>

#define DECODER_BUFFER_SIZE 4096


typedef struct OggContext {
    /* output */
    ogg_stream_state os ;
    int header_handled ;
    ogg_packet op;

    /* input */
    ogg_sync_state oy ;
} OggContext ;


#ifdef CONFIG_MUXERS
static int ogg_write_header(AVFormatContext *avfcontext)
{
    OggContext *context = avfcontext->priv_data;
    ogg_packet *op= &context->op;
    int n;

    ogg_stream_init(&context->os, 31415);

    for(n = 0 ; n < avfcontext->nb_streams ; n++) {
        AVCodecContext *codec = avfcontext->streams[n]->codec;
        uint8_t *headers = codec->extradata;
        int headers_len = codec->extradata_size;
        uint8_t *header_start[3];
        int header_len[3];
        int i, j;

        av_set_pts_info(avfcontext->streams[n], 60, 1, AV_TIME_BASE);

        for(j=1,i=0;i<2;++i, ++j) {
            header_len[i]=0;
            while(j<headers_len && headers[j]==0xff) {
                header_len[i]+=0xff;
                ++j;
            }
            header_len[i]+=headers[j];
        }
        header_len[2]=headers_len-header_len[0]-header_len[1]-j;
        headers+=j;
        header_start[0] = headers;
        header_start[1] = header_start[0] + header_len[0];
        header_start[2] = header_start[1] + header_len[1];

        for(i=0; i < 3; ++i){
            op->bytes = header_len[i];

            op->packet= header_start[i];
            op->b_o_s= op->packetno==0;

            ogg_stream_packetin(&context->os, op);

            op->packetno++; //FIXME multiple streams
        }

        context->header_handled = 0 ;
    }

    return 0 ;
}

static int ogg_write_packet(AVFormatContext *avfcontext, AVPacket *pkt)
{
    OggContext *context = avfcontext->priv_data ;
    AVCodecContext *avctx= avfcontext->streams[pkt->stream_index]->codec;
    ogg_packet *op= &context->op;
    ogg_page og ;
    int64_t pts;

    pts= av_rescale(pkt->pts, avctx->sample_rate, AV_TIME_BASE);

//    av_log(avfcontext, AV_LOG_DEBUG, "M%d\n", size);

    /* flush header packets so audio starts on a new page */

    if(!context->header_handled) {
        while(ogg_stream_flush(&context->os, &og)) {
            put_buffer(&avfcontext->pb, og.header, og.header_len) ;
            put_buffer(&avfcontext->pb, og.body, og.body_len) ;
            put_flush_packet(&avfcontext->pb);
        }
        context->header_handled = 1 ;
    }

    op->packet = (uint8_t*) pkt->data;
    op->bytes  = pkt->size;
    op->b_o_s  = op->packetno == 0;
    op->granulepos= pts;

    /* correct the fields in the packet -- essential for streaming */

    ogg_stream_packetin(&context->os, op);

    while(ogg_stream_pageout(&context->os, &og)) {
        put_buffer(&avfcontext->pb, og.header, og.header_len);
        put_buffer(&avfcontext->pb, og.body, og.body_len);
        put_flush_packet(&avfcontext->pb);
    }
    op->packetno++;

    return 0;
}


static int ogg_write_trailer(AVFormatContext *avfcontext) {
    OggContext *context = avfcontext->priv_data ;
    ogg_page og ;

    while(ogg_stream_flush(&context->os, &og)) {
        put_buffer(&avfcontext->pb, og.header, og.header_len) ;
        put_buffer(&avfcontext->pb, og.body, og.body_len) ;
        put_flush_packet(&avfcontext->pb);
    }

    ogg_stream_clear(&context->os) ;
    return 0 ;
}


AVOutputFormat ogg_muxer = {
    "ogg",
    "Ogg format",
    "application/ogg",
    "ogg",
    sizeof(OggContext),
    CODEC_ID_VORBIS,
    0,
    ogg_write_header,
    ogg_write_packet,
    ogg_write_trailer,
} ;
#endif //CONFIG_MUXERS

#if 0
static int next_packet(AVFormatContext *avfcontext, ogg_packet *op) {
    OggContext *context = avfcontext->priv_data ;
    ogg_page og ;
    char *buf ;

    while(ogg_stream_packetout(&context->os, op) != 1) {

        /* while no pages are available, read in more data to the sync */
        while(ogg_sync_pageout(&context->oy, &og) != 1) {
            buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
            if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
                return 1 ;
            ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
        }

        /* got a page. Feed it into the stream and get the packet */
        if(ogg_stream_pagein(&context->os, &og) != 0)
            return 1 ;
    }

    return 0 ;
}


static int ogg_read_header(AVFormatContext *avfcontext, AVFormatParameters *ap)
{
    OggContext *context = avfcontext->priv_data;
    ogg_packet op ;
    char *buf ;
    ogg_page og ;
    AVStream *ast ;
    AVCodecContext *codec;
    uint8_t *p;
    int i;

    ogg_sync_init(&context->oy) ;
    buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;

    if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
        return AVERROR_IO ;

    ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
    ogg_sync_pageout(&context->oy, &og) ;
    ogg_stream_init(&context->os, ogg_page_serialno(&og)) ;
    ogg_stream_pagein(&context->os, &og) ;

    /* currently only one vorbis stream supported */

    ast = av_new_stream(avfcontext, 0) ;
    if(!ast)
        return AVERROR_NOMEM ;
    av_set_pts_info(ast, 60, 1, AV_TIME_BASE);

    codec= &ast->codec;
    codec->codec_type = CODEC_TYPE_AUDIO;
    codec->codec_id = CODEC_ID_VORBIS;
    for(i=0; i<3; i++){
        if(next_packet(avfcontext, &op)){
            return -1;
        }
        if(op.bytes >= (1<<16) || op.bytes < 0)
            return -1;
        codec->extradata_size+= 2 + op.bytes;
        codec->extradata= av_realloc(codec->extradata, codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
        memset(codec->extradata + codec->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
        p= codec->extradata + codec->extradata_size - 2 - op.bytes;
        *(p++)= op.bytes>>8;
        *(p++)= op.bytes&0xFF;
        memcpy(p, op.packet, op.bytes);
    }

    return 0 ;
}


static int ogg_read_packet(AVFormatContext *avfcontext, AVPacket *pkt) {
    ogg_packet op ;

    if(next_packet(avfcontext, &op))
        return AVERROR_IO ;
    if(av_new_packet(pkt, op.bytes) < 0)
        return AVERROR_IO ;
    pkt->stream_index = 0 ;
    memcpy(pkt->data, op.packet, op.bytes);
    if(avfcontext->streams[0]->codec.sample_rate && op.granulepos!=-1)
        pkt->pts= av_rescale(op.granulepos, AV_TIME_BASE, avfcontext->streams[0]->codec.sample_rate);
//    printf("%"PRId64" %d %d\n", pkt->pts, (int)op.granulepos, avfcontext->streams[0]->codec.sample_rate);

    return op.bytes;
}


static int ogg_read_close(AVFormatContext *avfcontext) {
    OggContext *context = avfcontext->priv_data ;

    ogg_stream_clear(&context->os) ;
    ogg_sync_clear(&context->oy) ;

    return 0 ;
}


static AVInputFormat ogg_iformat = {
    "ogg",
    "Ogg Vorbis",
    sizeof(OggContext),
    NULL,
    ogg_read_header,
    ogg_read_packet,
    ogg_read_close,
    .extensions = "ogg",
} ;
#endif