Statistics
| Branch: | Revision:

ffmpeg / libavformat / libnut.c @ 72415b2a

History | View | Annotate | Download (9.08 KB)

1
/*
2
 * NUT (de)muxing via libnut
3
 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file libavformat/libnut.c
24
 * NUT demuxing and muxing via libnut.
25
 * @author Oded Shimon <ods15@ods15.dyndns.org>
26
 */
27

    
28
#include "avformat.h"
29
#include "riff.h"
30
#include <libnut.h>
31

    
32
#define ID_STRING "nut/multimedia container"
33
#define ID_LENGTH (strlen(ID_STRING) + 1)
34

    
35
typedef struct {
36
    nut_context_tt * nut;
37
    nut_stream_header_tt * s;
38
} NUTContext;
39

    
40
static const AVCodecTag nut_tags[] = {
41
    { CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
42
    { CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
43
    { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
44
    { 0, 0 },
45
};
46

    
47
#if CONFIG_LIBNUT_MUXER
48
static int av_write(void * h, size_t len, const uint8_t * buf) {
49
    ByteIOContext * bc = h;
50
    put_buffer(bc, buf, len);
51
    //put_flush_packet(bc);
52
    return len;
53
}
54

    
55
static int nut_write_header(AVFormatContext * avf) {
56
    NUTContext * priv = avf->priv_data;
57
    ByteIOContext * bc = avf->pb;
58
    nut_muxer_opts_tt mopts = {
59
        .output = {
60
            .priv = bc,
61
            .write = av_write,
62
        },
63
        .alloc = { av_malloc, av_realloc, av_free },
64
        .write_index = 1,
65
        .realtime_stream = 0,
66
        .max_distance = 32768,
67
        .fti = NULL,
68
    };
69
    nut_stream_header_tt * s;
70
    int i;
71

    
72
    priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
73

    
74
    for (i = 0; i < avf->nb_streams; i++) {
75
        AVCodecContext * codec = avf->streams[i]->codec;
76
        int j;
77
        int fourcc = 0;
78
        int num, denom, ssize;
79

    
80
        s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
81

    
82
        if (codec->codec_tag) fourcc = codec->codec_tag;
83
        else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
84

    
85
        if (!fourcc) {
86
            if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
87
            if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
88
        }
89

    
90
        s[i].fourcc_len = 4;
91
        s[i].fourcc = av_malloc(s[i].fourcc_len);
92
        for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
93

    
94
        ff_parse_specific_params(codec, &num, &ssize, &denom);
95
        av_set_pts_info(avf->streams[i], 60, denom, num);
96

    
97
        s[i].time_base.num = denom;
98
        s[i].time_base.den = num;
99

    
100
        s[i].fixed_fps = 0;
101
        s[i].decode_delay = codec->has_b_frames;
102
        s[i].codec_specific_len = codec->extradata_size;
103
        s[i].codec_specific = codec->extradata;
104

    
105
        if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
106
            s[i].width = codec->width;
107
            s[i].height = codec->height;
108
            s[i].sample_width = 0;
109
            s[i].sample_height = 0;
110
            s[i].colorspace_type = 0;
111
        } else {
112
            s[i].samplerate_num = codec->sample_rate;
113
            s[i].samplerate_denom = 1;
114
            s[i].channel_count = codec->channels;
115
        }
116
    }
117

    
118
    s[avf->nb_streams].type = -1;
119
    priv->nut = nut_muxer_init(&mopts, s, NULL);
120

    
121
    return 0;
122
}
123

    
124
static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
125
    NUTContext * priv = avf->priv_data;
126
    nut_packet_tt p;
127

    
128
    p.len = pkt->size;
129
    p.stream = pkt->stream_index;
130
    p.pts = pkt->pts;
131
    p.flags = pkt->flags & PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
132
    p.next_pts = 0;
133

    
134
    nut_write_frame_reorder(priv->nut, &p, pkt->data);
135

    
136
    return 0;
137
}
138

    
139
static int nut_write_trailer(AVFormatContext * avf) {
140
    ByteIOContext * bc = avf->pb;
141
    NUTContext * priv = avf->priv_data;
142
    int i;
143

    
144
    nut_muxer_uninit_reorder(priv->nut);
145
    put_flush_packet(bc);
146

    
147
    for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
148
    av_freep(&priv->s);
149

    
150
    return 0;
151
}
152

    
153
AVOutputFormat libnut_muxer = {
154
    "libnut",
155
    "nut format",
156
    "video/x-nut",
157
    "nut",
158
    sizeof(NUTContext),
159
    CODEC_ID_VORBIS,
160
    CODEC_ID_MPEG4,
161
    nut_write_header,
162
    nut_write_packet,
163
    nut_write_trailer,
164
    .flags = AVFMT_GLOBALHEADER,
165
};
166
#endif /* CONFIG_LIBNUT_MUXER */
167

    
168
static int nut_probe(AVProbeData *p) {
169
    if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
170

    
171
    return 0;
172
}
173

    
174
static size_t av_read(void * h, size_t len, uint8_t * buf) {
175
    ByteIOContext * bc = h;
176
    return get_buffer(bc, buf, len);
177
}
178

    
179
static off_t av_seek(void * h, long long pos, int whence) {
180
    ByteIOContext * bc = h;
181
    if (whence == SEEK_END) {
182
        pos = url_fsize(bc) + pos;
183
        whence = SEEK_SET;
184
    }
185
    return url_fseek(bc, pos, whence);
186
}
187

    
188
static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) {
189
    NUTContext * priv = avf->priv_data;
190
    ByteIOContext * bc = avf->pb;
191
    nut_demuxer_opts_tt dopts = {
192
        .input = {
193
            .priv = bc,
194
            .seek = av_seek,
195
            .read = av_read,
196
            .eof = NULL,
197
            .file_pos = 0,
198
        },
199
        .alloc = { av_malloc, av_realloc, av_free },
200
        .read_index = 1,
201
        .cache_syncpoints = 1,
202
    };
203
    nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
204
    nut_stream_header_tt * s;
205
    int ret, i;
206

    
207
    if ((ret = nut_read_headers(nut, &s, NULL))) {
208
        av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
209
        nut_demuxer_uninit(nut);
210
        return -1;
211
    }
212

    
213
    priv->s = s;
214

    
215
    for (i = 0; s[i].type != -1 && i < 2; i++) {
216
        AVStream * st = av_new_stream(avf, i);
217
        int j;
218

    
219
        for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
220

    
221
        st->codec->has_b_frames = s[i].decode_delay;
222

    
223
        st->codec->extradata_size = s[i].codec_specific_len;
224
        if (st->codec->extradata_size) {
225
            st->codec->extradata = av_mallocz(st->codec->extradata_size);
226
            memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
227
        }
228

    
229
        av_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
230
        st->start_time = 0;
231
        st->duration = s[i].max_pts;
232

    
233
        st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
234

    
235
        switch(s[i].type) {
236
        case NUT_AUDIO_CLASS:
237
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
238
            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag);
239

    
240
            st->codec->channels = s[i].channel_count;
241
            st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
242
            break;
243
        case NUT_VIDEO_CLASS:
244
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
245
            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
246

    
247
            st->codec->width = s[i].width;
248
            st->codec->height = s[i].height;
249
            st->sample_aspect_ratio.num = s[i].sample_width;
250
            st->sample_aspect_ratio.den = s[i].sample_height;
251
            break;
252
        }
253
        if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
254
    }
255

    
256
    return 0;
257
}
258

    
259
static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
260
    NUTContext * priv = avf->priv_data;
261
    nut_packet_tt pd;
262
    int ret;
263

    
264
    ret = nut_read_next_packet(priv->nut, &pd);
265

    
266
    if (ret || av_new_packet(pkt, pd.len) < 0) {
267
        if (ret != NUT_ERR_EOF)
268
            av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
269
        return -1;
270
    }
271

    
272
    if (pd.flags & NUT_FLAG_KEY) pkt->flags |= PKT_FLAG_KEY;
273
    pkt->pts = pd.pts;
274
    pkt->stream_index = pd.stream;
275
    pkt->pos = url_ftell(avf->pb);
276

    
277
    ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
278

    
279
    return ret;
280
}
281

    
282
static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
283
    NUTContext * priv = avf->priv_data;
284
    int active_streams[] = { stream_index, -1 };
285
    double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
286

    
287
    if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
288

    
289
    return 0;
290
}
291

    
292
static int nut_read_close(AVFormatContext *s) {
293
    NUTContext * priv = s->priv_data;
294

    
295
    nut_demuxer_uninit(priv->nut);
296

    
297
    return 0;
298
}
299

    
300
AVInputFormat libnut_demuxer = {
301
    "libnut",
302
    NULL_IF_CONFIG_SMALL("NUT format"),
303
    sizeof(NUTContext),
304
    nut_probe,
305
    nut_read_header,
306
    nut_read_packet,
307
    nut_read_close,
308
    nut_read_seek,
309
    .extensions = "nut",
310
};