libavformat/teeproto.c

   1 /*
   2  * Tee output protocol
   3  * Copyright (c) 2016 Michael Niedermayer
   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 #include <string.h>
  23
  24 #include "libavutil/avstring.h"
  25 #include "libavutil/dict.h"
  26 #include "libavutil/error.h"
  27 #include "libavutil/mem.h"
  28 #include "tee_common.h"
  29 #include "url.h"
  30
  31 typedef struct ChildContext {
  32     URLContext *url_context;
  33 } ChildContext;
  34
  35 typedef struct TeeContext {
  36     int child_count;
  37     ChildContext *child;
  38 } TeeContext;
  39
  40 static const char *const child_delim = "|";
  41
  42 static int tee_write(URLContext *h, const unsigned char *buf, int size)
  43 {
  44     TeeContext *c = h->priv_data;
  45     int i;
  46     int main_ret = size;
  47
  48     for (i=0; i<c->child_count; i++) {
  49         int ret = ffurl_write(c->child[i].url_context, buf, size);
  50         if (ret < 0)
  51             main_ret = ret;
  52     }
  53     return main_ret;
  54 }
  55
  56 static int tee_close(URLContext *h)
  57 {
  58     TeeContext *c = h->priv_data;
  59     int i;
  60     int main_ret = 0;
  61
  62     for (i=0; i<c->child_count; i++) {
  63         int ret = ffurl_closep(&c->child[i].url_context);
  64         if (ret < 0)
  65             main_ret = ret;
  66     }
  67
  68     av_freep(&c->child);
  69     c->child_count = 0;
  70     return main_ret;
  71 }
  72
  73 static int tee_open(URLContext *h, const char *filename, int flags)
  74 {
  75     TeeContext *c = h->priv_data;
  76     int ret, i;
  77
  78     av_strstart(filename, "tee:", &filename);
  79
  80     while (*filename) {
  81         char *child_string = av_get_token(&filename, child_delim);
  82         char *child_name = NULL;
  83         void *tmp;
  84         AVDictionary *options = NULL;
  85         if (!child_string) {
  86             ret = AVERROR(ENOMEM);
  87             goto fail;
  88         }
  89
  90         tmp = av_realloc_array(c->child, c->child_count + 1, sizeof(*c->child));
  91         if (!tmp) {
  92             ret = AVERROR(ENOMEM);
  93             goto loop_fail;
  94         }
  95         c->child = tmp;
  96         memset(&c->child[c->child_count], 0, sizeof(c->child[c->child_count]));
  97
  98         ret = ff_tee_parse_slave_options(h, child_string, &options, &child_name);
  99         if (ret < 0)
 100             goto loop_fail;
 101
 102         ret = ffurl_open_whitelist(&c->child[c->child_count].url_context, child_name, flags,
 103                                    &h->interrupt_callback, &options,
 104                                    h->protocol_whitelist, h->protocol_blacklist,
 105                                    h);
 106 loop_fail:
 107         av_freep(&child_string);
 108         av_dict_free(&options);
 109         if (ret < 0)
 110             goto fail;
 111         c->child_count++;
 112
 113         if (strspn(filename, child_delim))
 114             filename++;
 115     }
 116
 117     h->is_streamed = 0;
 118     for (i=0; i<c->child_count; i++) {
 119         h->is_streamed |= c->child[i].url_context->is_streamed;
 120     }
 121
 122     h->max_packet_size = 0;
 123     for (i = 0; i < c->child_count; i++) {
 124         int max = c->child[i].url_context->max_packet_size;
 125         if (!max)
 126             continue;
 127
 128         if (!h->max_packet_size)
 129             h->max_packet_size = max;
 130         else if (h->max_packet_size > max)
 131             h->max_packet_size = max;
 132     }
 133
 134     return 0;
 135 fail:
 136     tee_close(h);
 137     return ret;
 138 }
 139 const URLProtocol ff_tee_protocol = {
 140     .name                = "tee",
 141     .url_open            = tee_open,
 142     .url_write           = tee_write,
 143     .url_close           = tee_close,
 144     .priv_data_size      = sizeof(TeeContext),
 145     .default_whitelist   = "crypto,file,http,https,httpproxy,rtmp,tcp,tls"
 146 };