aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/libnut.c
blob: 467ca9c4a585757af3cba5465f3f6708d2a429a7 (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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/*
 * NUT (de)muxing via libnut
 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
 *
 * 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
 */

/**
 * @file
 * NUT demuxing and muxing via libnut.
 * @author Oded Shimon <ods15@ods15.dyndns.org>
 */

#include "avformat.h"
#include "riff.h"
#include <libnut.h>

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

typedef struct {
    nut_context_tt * nut;
    nut_stream_header_tt * s;
} NUTContext;

static const AVCodecTag nut_tags[] = {
    { CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
    { CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
    { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
    { 0, 0 },
};

#if CONFIG_LIBNUT_MUXER
static int av_write(void * h, size_t len, const uint8_t * buf) {
    AVIOContext * bc = h;
    avio_write(bc, buf, len);
    //put_flush_packet(bc);
    return len;
}

static int nut_write_header(AVFormatContext * avf) {
    NUTContext * priv = avf->priv_data;
    AVIOContext * bc = avf->pb;
    nut_muxer_opts_tt mopts = {
        .output = {
            .priv = bc,
            .write = av_write,
        },
        .alloc = { av_malloc, av_realloc, av_free },
        .write_index = 1,
        .realtime_stream = 0,
        .max_distance = 32768,
        .fti = NULL,
    };
    nut_stream_header_tt * s;
    int i;

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

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

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

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

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

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

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

        s[i].time_base.num = denom;
        s[i].time_base.den = num;

        s[i].fixed_fps = 0;
        s[i].decode_delay = codec->has_b_frames;
        s[i].codec_specific_len = codec->extradata_size;
        s[i].codec_specific = codec->extradata;

        if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
            s[i].width = codec->width;
            s[i].height = codec->height;
            s[i].sample_width = 0;
            s[i].sample_height = 0;
            s[i].colorspace_type = 0;
        } else {
            s[i].samplerate_num = codec->sample_rate;
            s[i].samplerate_denom = 1;
            s[i].channel_count = codec->channels;
        }
    }

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

    return 0;
}

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

    p.len = pkt->size;
    p.stream = pkt->stream_index;
    p.pts = pkt->pts;
    p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
    p.next_pts = 0;

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

    return 0;
}

static int nut_write_trailer(AVFormatContext * avf) {
    AVIOContext * bc = avf->pb;
    NUTContext * priv = avf->priv_data;
    int i;

    nut_muxer_uninit_reorder(priv->nut);
    put_flush_packet(bc);

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

    return 0;
}

AVOutputFormat ff_libnut_muxer = {
    "libnut",
    "nut format",
    "video/x-nut",
    "nut",
    sizeof(NUTContext),
    CODEC_ID_VORBIS,
    CODEC_ID_MPEG4,
    nut_write_header,
    nut_write_packet,
    nut_write_trailer,
    .flags = AVFMT_GLOBALHEADER,
};
#endif /* CONFIG_LIBNUT_MUXER */

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

    return 0;
}

static size_t av_read(void * h, size_t len, uint8_t * buf) {
    AVIOContext * bc = h;
    return avio_read(bc, buf, len);
}

static off_t av_seek(void * h, long long pos, int whence) {
    AVIOContext * bc = h;
    if (whence == SEEK_END) {
        pos = url_fsize(bc) + pos;
        whence = SEEK_SET;
    }
    return avio_seek(bc, pos, whence);
}

static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) {
    NUTContext * priv = avf->priv_data;
    AVIOContext * bc = avf->pb;
    nut_demuxer_opts_tt dopts = {
        .input = {
            .priv = bc,
            .seek = av_seek,
            .read = av_read,
            .eof = NULL,
            .file_pos = 0,
        },
        .alloc = { av_malloc, av_realloc, av_free },
        .read_index = 1,
        .cache_syncpoints = 1,
    };
    nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
    nut_stream_header_tt * s;
    int ret, i;

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

    priv->s = s;

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

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

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

        st->codec->extradata_size = s[i].codec_specific_len;
        if (st->codec->extradata_size) {
            st->codec->extradata = av_mallocz(st->codec->extradata_size);
            memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
        }

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

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

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

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

            st->codec->width = s[i].width;
            st->codec->height = s[i].height;
            st->sample_aspect_ratio.num = s[i].sample_width;
            st->sample_aspect_ratio.den = s[i].sample_height;
            break;
        }
        if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
    }

    return 0;
}

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

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

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

    if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
    pkt->pts = pd.pts;
    pkt->stream_index = pd.stream;
    pkt->pos = url_ftell(avf->pb);

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

    return ret;
}

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

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

    return 0;
}

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

    nut_demuxer_uninit(priv->nut);

    return 0;
}

AVInputFormat ff_libnut_demuxer = {
    "libnut",
    NULL_IF_CONFIG_SMALL("NUT format"),
    sizeof(NUTContext),
    nut_probe,
    nut_read_header,
    nut_read_packet,
    nut_read_close,
    nut_read_seek,
    .extensions = "nut",
};