summaryrefslogtreecommitdiffstats
path: root/libavformat/segment.c
blob: f96398b6c7a09a67966ec859d457a81bbe53c745 (plain)
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
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/*
 * Generic segmenter
 * Copyright (c) 2011, Luca Barbato
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <float.h>

#include "avformat.h"
#include "internal.h"

#include "libavutil/avassert.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/parseutils.h"
#include "libavutil/mathematics.h"

typedef enum {
    LIST_TYPE_FLAT = 0,
    LIST_TYPE_EXT,
    LIST_TYPE_NB,
} ListType;

typedef struct {
    const AVClass *class;  /**< Class for private options. */
    int number;
    AVFormatContext *avf;
    char *format;          ///< format to use for output segment files
    char *list;            ///< filename for the segment list file
    int   list_size;       ///< number of entries for the segment list file
    ListType list_type;    ///< set the list type
    AVIOContext *list_pb;  ///< list file put-byte context
    int  wrap;             ///< number after which the index wraps
    char *time_str;        ///< segment duration specification string
    int64_t time;          ///< segment duration
    char *times_str;       ///< segment times specification string
    int64_t *times;        ///< list of segment interval specification
    int nb_times;          ///< number of elments in the times array
    char *time_delta_str;  ///< approximation value duration used for the segment times
    int64_t time_delta;
    int has_video;
    double start_time, end_time;
} SegmentContext;

static int segment_start(AVFormatContext *s)
{
    SegmentContext *seg = s->priv_data;
    AVFormatContext *oc = seg->avf;
    int err = 0;

    if (seg->wrap)
        seg->number %= seg->wrap;

    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
                              s->filename, seg->number++) < 0) {
        av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
        return AVERROR(EINVAL);
    }

    if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
                          &s->interrupt_callback, NULL)) < 0)
        return err;

    if (!oc->priv_data && oc->oformat->priv_data_size > 0) {
        oc->priv_data = av_mallocz(oc->oformat->priv_data_size);
        if (!oc->priv_data) {
            avio_close(oc->pb);
            return AVERROR(ENOMEM);
        }
        if (oc->oformat->priv_class) {
            *(const AVClass**)oc->priv_data = oc->oformat->priv_class;
            av_opt_set_defaults(oc->priv_data);
        }
    }

    if ((err = oc->oformat->write_header(oc)) < 0) {
        goto fail;
    }

    return 0;

fail:
    av_log(oc, AV_LOG_ERROR, "Failure occurred when starting segment '%s'\n",
           oc->filename);
    avio_close(oc->pb);
    av_freep(&oc->priv_data);

    return err;
}

static int segment_end(AVFormatContext *s)
{
    SegmentContext *seg = s->priv_data;
    AVFormatContext *oc = seg->avf;
    int ret = 0;

    if (oc->oformat->write_trailer)
        ret = oc->oformat->write_trailer(oc);

    if (ret < 0)
        av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
               oc->filename);

    if (seg->list) {
        if (seg->list_size && !(seg->number % seg->list_size)) {
            avio_close(seg->list_pb);
            if ((ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
                                  &s->interrupt_callback, NULL)) < 0)
                goto end;
        }

        if (seg->list_type == LIST_TYPE_FLAT) {
            avio_printf(seg->list_pb, "%s\n", oc->filename);
        } else if (seg->list_type == LIST_TYPE_EXT) {
            avio_printf(seg->list_pb, "%s,%f,%f\n", oc->filename, seg->start_time, seg->end_time);
        }
        avio_flush(seg->list_pb);
    }

end:
    avio_close(oc->pb);
    if (oc->oformat->priv_class)
        av_opt_free(oc->priv_data);
    av_freep(&oc->priv_data);

    return ret;
}

static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
                       const char *times_str)
{
    char *p;
    int i, ret = 0;
    char *times_str1 = av_strdup(times_str);
    char *saveptr = NULL;

    if (!times_str1)
        return AVERROR(ENOMEM);

#define FAIL(err) ret = err; goto end

    *nb_times = 1;
    for (p = times_str1; *p; p++)
        if (*p == ',')
            (*nb_times)++;

    *times = av_malloc(sizeof(**times) * *nb_times);
    if (!*times) {
        av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
        FAIL(AVERROR(ENOMEM));
    }

    p = times_str1;
    for (i = 0; i < *nb_times; i++) {
        int64_t t;
        char *tstr = av_strtok(p, ",", &saveptr);
        av_assert0(tstr);
        p = NULL;

        ret = av_parse_time(&t, tstr, 1);
        if (ret < 0) {
            av_log(log_ctx, AV_LOG_ERROR,
                   "Invalid time duration specification in %s\n", p);
            FAIL(AVERROR(EINVAL));
        }
        (*times)[i] = t;

        /* check on monotonicity */
        if (i && (*times)[i-1] > (*times)[i]) {
            av_log(log_ctx, AV_LOG_ERROR,
                   "Specified time %f is greater than the following time %f\n",
                   (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
            FAIL(AVERROR(EINVAL));
        }
    }

end:
    av_free(times_str1);
    return ret;
}

static int seg_write_header(AVFormatContext *s)
{
    SegmentContext *seg = s->priv_data;
    AVFormatContext *oc;
    int ret, i;

    seg->number = 0;

    if (seg->time_str && seg->times_str) {
        av_log(s, AV_LOG_ERROR,
               "segment_time and segment_times options are mutually exclusive, select just one of them\n");
        return AVERROR(EINVAL);
    }

    if (seg->times_str) {
        if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
            return ret;
    } else {
        /* set default value if not specified */
        if (!seg->time_str)
            seg->time_str = av_strdup("2");
        if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
            av_log(s, AV_LOG_ERROR,
                   "Invalid time duration specification '%s' for segment_time option\n",
                   seg->time_str);
            return ret;
        }
    }

    if (seg->time_delta_str) {
        if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) {
            av_log(s, AV_LOG_ERROR,
                   "Invalid time duration specification '%s' for delta option\n",
                   seg->time_delta_str);
            return ret;
        }
    }

    oc = avformat_alloc_context();

    if (!oc)
        return AVERROR(ENOMEM);

    if (seg->list)
        if ((ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
                              &s->interrupt_callback, NULL)) < 0)
            goto fail;

    for (i = 0; i< s->nb_streams; i++)
        seg->has_video +=
            (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);

    if (seg->has_video > 1)
        av_log(s, AV_LOG_WARNING,
               "More than a single video stream present, "
               "expect issues decoding it.\n");

    oc->oformat = av_guess_format(seg->format, s->filename, NULL);

    if (!oc->oformat) {
        ret = AVERROR_MUXER_NOT_FOUND;
        goto fail;
    }
    if (oc->oformat->flags & AVFMT_NOFILE) {
        av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
               oc->oformat->name);
        ret = AVERROR(EINVAL);
        goto fail;
    }

    seg->avf = oc;

    oc->streams = s->streams;
    oc->nb_streams = s->nb_streams;

    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
                              s->filename, seg->number++) < 0) {
        ret = AVERROR(EINVAL);
        goto fail;
    }

    if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
                          &s->interrupt_callback, NULL)) < 0)
        goto fail;

    if ((ret = avformat_write_header(oc, NULL)) < 0) {
        avio_close(oc->pb);
        goto fail;
    }

fail:
    if (ret) {
        if (oc) {
            oc->streams = NULL;
            oc->nb_streams = 0;
            avformat_free_context(oc);
        }
        if (seg->list)
            avio_close(seg->list_pb);
    }
    return ret;
}

static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    SegmentContext *seg = s->priv_data;
    AVFormatContext *oc = seg->avf;
    AVStream *st = oc->streams[pkt->stream_index];
    int64_t end_pts;
    int ret;

    if (seg->times) {
        end_pts = seg->number <= seg->nb_times ? seg->times[seg->number-1] : INT64_MAX;
    } else {
        end_pts = seg->time * seg->number;
    }

    /* if the segment has video, start a new segment *only* with a key video frame */
    if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO || !seg->has_video) &&
        av_compare_ts(pkt->pts, st->time_base,
                      end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0 &&
        pkt->flags & AV_PKT_FLAG_KEY) {

        av_log(s, AV_LOG_DEBUG, "Next segment starts with packet stream:%d pts:%"PRId64" pts_time:%f\n",
               pkt->stream_index, pkt->pts, pkt->pts * av_q2d(st->time_base));

        if ((ret = segment_end(s)) < 0 || (ret = segment_start(s)) < 0)
            goto fail;
        seg->start_time = (double)pkt->pts * av_q2d(st->time_base);
    } else if (pkt->pts != AV_NOPTS_VALUE) {
        seg->end_time = FFMAX(seg->end_time,
                              (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
    }

    ret = oc->oformat->write_packet(oc, pkt);

fail:
    if (ret < 0) {
        oc->streams = NULL;
        oc->nb_streams = 0;
        if (seg->list)
            avio_close(seg->list_pb);
        avformat_free_context(oc);
    }

    return ret;
}

static int seg_write_trailer(struct AVFormatContext *s)
{
    SegmentContext *seg = s->priv_data;
    AVFormatContext *oc = seg->avf;
    int ret = segment_end(s);
    if (seg->list)
        avio_close(seg->list_pb);

    av_opt_free(seg);
    av_freep(&seg->times);

    oc->streams = NULL;
    oc->nb_streams = 0;
    avformat_free_context(oc);
    return ret;
}

#define OFFSET(x) offsetof(SegmentContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    { "segment_format",    "set container format used for the segments", OFFSET(format),  AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
    { "segment_list",      "set the segment list filename",              OFFSET(list),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
    { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT,  {.dbl = 5},     0, INT_MAX, E },
    { "segment_list_type", "set the segment list type",                  OFFSET(list_type), AV_OPT_TYPE_INT,  {.dbl = LIST_TYPE_FLAT}, 0, LIST_TYPE_NB-1, E, "list_type" },
    { "flat", "flat format",     0, AV_OPT_TYPE_CONST, {.dbl=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, 0, "list_type" },
    { "ext",  "extended format", 0, AV_OPT_TYPE_CONST, {.dbl=LIST_TYPE_EXT  }, INT_MIN, INT_MAX, 0, "list_type" },
    { "segment_time",      "set segment duration",                       OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
    { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E },
    { "segment_times",     "set segment split time points",              OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
    { "segment_wrap",      "set number after which the index wraps",     OFFSET(wrap),    AV_OPT_TYPE_INT,    {.dbl = 0},     0, INT_MAX, E },
    { NULL },
};

static const AVClass seg_class = {
    .class_name = "segment muxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVOutputFormat ff_segment_muxer = {
    .name           = "segment",
    .long_name      = NULL_IF_CONFIG_SMALL("segment muxer"),
    .priv_data_size = sizeof(SegmentContext),
    .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
    .write_header   = seg_write_header,
    .write_packet   = seg_write_packet,
    .write_trailer  = seg_write_trailer,
    .priv_class     = &seg_class,
};

static const AVClass sseg_class = {
    .class_name = "stream_segment muxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVOutputFormat ff_stream_segment_muxer = {
    .name           = "stream_segment,ssegment",
    .long_name      = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
    .priv_data_size = sizeof(SegmentContext),
    .flags          = AVFMT_NOFILE,
    .write_header   = seg_write_header,
    .write_packet   = seg_write_packet,
    .write_trailer  = seg_write_trailer,
    .priv_class     = &sseg_class,
};
OpenPOWER on IntegriCloud