summaryrefslogtreecommitdiffstats
path: root/libavformat/hlsenc.c
blob: 21c952630d201332f897231ffbf2705f02508c6c (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
/*
 * Apple HTTP Live Streaming segmenter
 * Copyright (c) 2012, 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 <stdint.h>

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

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

typedef struct ListEntry {
    char  name[1024];
    int   duration;
    struct ListEntry *next;
} ListEntry;

typedef struct HLSContext {
    const AVClass *class;  // Class for private options.
    unsigned number;
    int64_t sequence;
    int64_t start_sequence;
    AVOutputFormat *oformat;
    AVFormatContext *avf;
    float time;            // Set by a private option.
    int  size;             // Set by a private option.
    int  wrap;             // Set by a private option.
    int  allowcache;
    int64_t recording_time;
    int has_video;
    int64_t start_pts;
    int64_t end_pts;
    int64_t duration;      // last segment duration computed so far, in seconds
    int nb_entries;
    ListEntry *list;
    ListEntry *end_list;
    char *basename;
    char *baseurl;
} HLSContext;

static int hls_mux_init(AVFormatContext *s)
{
    HLSContext *hls = s->priv_data;
    AVFormatContext *oc;
    int i;

    hls->avf = oc = avformat_alloc_context();
    if (!oc)
        return AVERROR(ENOMEM);

    oc->oformat            = hls->oformat;
    oc->interrupt_callback = s->interrupt_callback;

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st;
        if (!(st = avformat_new_stream(oc, NULL)))
            return AVERROR(ENOMEM);
        avcodec_copy_context(st->codec, s->streams[i]->codec);
        st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
        st->time_base = s->streams[i]->time_base;
    }

    return 0;
}

static int append_entry(HLSContext *hls, uint64_t duration)
{
    ListEntry *en = av_malloc(sizeof(*en));

    if (!en)
        return AVERROR(ENOMEM);

    av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));

    en->duration = duration;
    en->next     = NULL;

    if (!hls->list)
        hls->list = en;
    else
        hls->end_list->next = en;

    hls->end_list = en;

    if (hls->nb_entries >= hls->size) {
        en = hls->list;
        hls->list = en->next;
        av_free(en);
    } else
        hls->nb_entries++;

    hls->sequence++;

    return 0;
}

static void free_entries(HLSContext *hls)
{
    ListEntry *p = hls->list, *en;

    while(p) {
        en = p;
        p = p->next;
        av_free(en);
    }
}

static int hls_window(AVFormatContext *s, int last)
{
    HLSContext *hls = s->priv_data;
    ListEntry *en;
    int target_duration = 0;
    int ret = 0;
    AVIOContext *out = NULL;
    char temp_filename[1024];
    int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->size);

    snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
    if ((ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
                          &s->interrupt_callback, NULL)) < 0)
        goto fail;

    for (en = hls->list; en; en = en->next) {
        if (target_duration < en->duration)
            target_duration = en->duration;
    }

    avio_printf(out, "#EXTM3U\n");
    avio_printf(out, "#EXT-X-VERSION:3\n");
    if (hls->allowcache == 0 || hls->allowcache == 1) {
        avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
    }
    avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
    avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);

    av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
           sequence);

    for (en = hls->list; en; en = en->next) {
        avio_printf(out, "#EXTINF:%d,\n", en->duration);
        if (hls->baseurl)
            avio_printf(out, "%s", hls->baseurl);
        avio_printf(out, "%s\n", en->name);
    }

    if (last)
        avio_printf(out, "#EXT-X-ENDLIST\n");

fail:
    avio_closep(&out);
    if (ret >= 0)
        ff_rename(temp_filename, s->filename);
    return ret;
}

static int hls_start(AVFormatContext *s)
{
    HLSContext *c = s->priv_data;
    AVFormatContext *oc = c->avf;
    int err = 0;

    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
                              c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0)
        return AVERROR(EINVAL);
    c->number++;

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

    if (oc->oformat->priv_class && oc->priv_data)
        av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);

    return 0;
}

static int hls_write_header(AVFormatContext *s)
{
    HLSContext *hls = s->priv_data;
    int ret, i;
    char *p;
    const char *pattern = "%d.ts";
    int basename_size = strlen(s->filename) + strlen(pattern) + 1;

    hls->sequence       = hls->start_sequence;
    hls->recording_time = hls->time * AV_TIME_BASE;
    hls->start_pts      = AV_NOPTS_VALUE;

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

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

    hls->oformat = av_guess_format("mpegts", NULL, NULL);

    if (!hls->oformat) {
        ret = AVERROR_MUXER_NOT_FOUND;
        goto fail;
    }

    hls->basename = av_malloc(basename_size);

    if (!hls->basename) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    strcpy(hls->basename, s->filename);

    p = strrchr(hls->basename, '.');

    if (p)
        *p = '\0';

    av_strlcat(hls->basename, pattern, basename_size);

    if ((ret = hls_mux_init(s)) < 0)
        goto fail;

    if ((ret = hls_start(s)) < 0)
        goto fail;

    if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
        return ret;


fail:
    if (ret) {
        av_free(hls->basename);
        if (hls->avf)
            avformat_free_context(hls->avf);
    }
    return ret;
}

static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    HLSContext *hls = s->priv_data;
    AVFormatContext *oc = hls->avf;
    AVStream *st = s->streams[pkt->stream_index];
    int64_t end_pts = hls->recording_time * hls->number;
    int ret, can_split = 1;

    if (hls->start_pts == AV_NOPTS_VALUE) {
        hls->start_pts = pkt->pts;
        hls->end_pts   = pkt->pts;
    }

    if (hls->has_video) {
        can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
                    pkt->flags & AV_PKT_FLAG_KEY;
    }
    if (pkt->pts == AV_NOPTS_VALUE)
        can_split = 0;
    else
        hls->duration = av_rescale(pkt->pts - hls->end_pts,
                                   st->time_base.num, st->time_base.den);

    if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
                                   end_pts, AV_TIME_BASE_Q) >= 0) {
        ret = append_entry(hls, hls->duration);
        if (ret)
            return ret;

        hls->end_pts = pkt->pts;
        hls->duration = 0;

        av_write_frame(oc, NULL); /* Flush any buffered data */
        avio_close(oc->pb);

        ret = hls_start(s);

        if (ret)
            return ret;

        oc = hls->avf;

        if ((ret = hls_window(s, 0)) < 0)
            return ret;
    }

    ret = ff_write_chained(oc, pkt->stream_index, pkt, s);

    return ret;
}

static int hls_write_trailer(struct AVFormatContext *s)
{
    HLSContext *hls = s->priv_data;
    AVFormatContext *oc = hls->avf;

    av_write_trailer(oc);
    avio_closep(&oc->pb);
    avformat_free_context(oc);
    av_free(hls->basename);
    append_entry(hls, hls->duration);
    hls_window(s, 1);

    free_entries(hls);
    return 0;
}

#define OFFSET(x) offsetof(HLSContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    {"start_number",  "first number in the sequence",            OFFSET(start_sequence),AV_OPT_TYPE_INT64,  {.i64 = 0},     0, INT64_MAX, E},
    {"hls_time",      "segment length in seconds",               OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E},
    {"hls_list_size", "maximum number of playlist entries",      OFFSET(size),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},
    {"hls_wrap",      "number after which the index wraps",      OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
    {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
    {"hls_base_url",  "url to prepend to each playlist entry",   OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E},
    { NULL },
};

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


AVOutputFormat ff_hls_muxer = {
    .name           = "hls",
    .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
    .extensions     = "m3u8",
    .priv_data_size = sizeof(HLSContext),
    .audio_codec    = AV_CODEC_ID_AAC,
    .video_codec    = AV_CODEC_ID_H264,
    .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
    .write_header   = hls_write_header,
    .write_packet   = hls_write_packet,
    .write_trailer  = hls_write_trailer,
    .priv_class     = &hls_class,
};
OpenPOWER on IntegriCloud