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![Martin Storsjö](/assets/img/avatar_default.png)
Since all URLContexts have the same AVOptions, such AVOptions will be applied on the outermost context only and removed from the dict, while they probably make sense on all contexts. This makes sure that rw_timeout gets propagated to the innermost URLContext (to make sure it gets passed to the tcp protocol, when opening a http connection for instance). Alternatively, such matching options would be kept in the dict and only removed after the ffurl_connect call. Signed-off-by: Martin Storsjö <martin@martin.st>
192 lines
5.3 KiB
C
192 lines
5.3 KiB
C
/*
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* Concat URL protocol
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* Copyright (c) 2006 Steve Lhomme
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* Copyright (c) 2007 Wolfram Gloger
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* Copyright (c) 2010 Michele Orrù
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/mem.h"
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#include "avformat.h"
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#include "url.h"
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#define AV_CAT_SEPARATOR "|"
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struct concat_nodes {
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URLContext *uc; ///< node's URLContext
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int64_t size; ///< url filesize
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};
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struct concat_data {
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struct concat_nodes *nodes; ///< list of nodes to concat
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size_t length; ///< number of cat'ed nodes
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size_t current; ///< index of currently read node
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};
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static av_cold int concat_close(URLContext *h)
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{
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int err = 0;
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size_t i;
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struct concat_data *data = h->priv_data;
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struct concat_nodes *nodes = data->nodes;
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for (i = 0; i != data->length; i++)
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err |= ffurl_close(nodes[i].uc);
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av_freep(&data->nodes);
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return err < 0 ? -1 : 0;
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}
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static av_cold int concat_open(URLContext *h, const char *uri, int flags)
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{
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char *node_uri = NULL;
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int err = 0;
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int64_t size;
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size_t len, i;
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URLContext *uc;
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struct concat_data *data = h->priv_data;
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struct concat_nodes *nodes;
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av_strstart(uri, "concat:", &uri);
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for (i = 0, len = 1; uri[i]; i++) {
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if (uri[i] == *AV_CAT_SEPARATOR) {
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/* integer overflow */
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if (++len == UINT_MAX / sizeof(*nodes)) {
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av_freep(&h->priv_data);
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return AVERROR(ENAMETOOLONG);
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}
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}
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}
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if (!(nodes = av_realloc(NULL, sizeof(*nodes) * len)))
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return AVERROR(ENOMEM);
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else
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data->nodes = nodes;
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/* handle input */
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if (!*uri)
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err = AVERROR(ENOENT);
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for (i = 0; *uri; i++) {
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/* parsing uri */
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len = strcspn(uri, AV_CAT_SEPARATOR);
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if ((err = av_reallocp(&node_uri, len + 1)) < 0)
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break;
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av_strlcpy(node_uri, uri, len + 1);
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uri += len + strspn(uri + len, AV_CAT_SEPARATOR);
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/* creating URLContext */
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if ((err = ffurl_open(&uc, node_uri, flags,
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&h->interrupt_callback, NULL, h->protocols, h)) < 0)
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break;
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/* creating size */
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if ((size = ffurl_size(uc)) < 0) {
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ffurl_close(uc);
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err = AVERROR(ENOSYS);
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break;
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}
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/* assembling */
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nodes[i].uc = uc;
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nodes[i].size = size;
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}
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av_free(node_uri);
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data->length = i;
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if (err < 0)
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concat_close(h);
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else if ((err = av_reallocp(&nodes, data->length * sizeof(*nodes))) < 0)
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concat_close(h);
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else
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data->nodes = nodes;
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return err;
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}
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static int concat_read(URLContext *h, unsigned char *buf, int size)
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{
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int result, total = 0;
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struct concat_data *data = h->priv_data;
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struct concat_nodes *nodes = data->nodes;
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size_t i = data->current;
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while (size > 0) {
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result = ffurl_read(nodes[i].uc, buf, size);
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if (result < 0)
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return total ? total : result;
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if (!result) {
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if (i + 1 == data->length ||
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ffurl_seek(nodes[++i].uc, 0, SEEK_SET) < 0)
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break;
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}
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total += result;
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buf += result;
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size -= result;
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}
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data->current = i;
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return total;
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}
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static int64_t concat_seek(URLContext *h, int64_t pos, int whence)
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{
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int64_t result;
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struct concat_data *data = h->priv_data;
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struct concat_nodes *nodes = data->nodes;
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size_t i;
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switch (whence) {
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case SEEK_END:
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for (i = data->length - 1; i && pos < -nodes[i].size; i--)
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pos += nodes[i].size;
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break;
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case SEEK_CUR:
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/* get the absolute position */
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for (i = 0; i != data->current; i++)
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pos += nodes[i].size;
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pos += ffurl_seek(nodes[i].uc, 0, SEEK_CUR);
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whence = SEEK_SET;
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/* fall through with the absolute position */
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case SEEK_SET:
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for (i = 0; i != data->length - 1 && pos >= nodes[i].size; i++)
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pos -= nodes[i].size;
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break;
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default:
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return AVERROR(EINVAL);
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}
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result = ffurl_seek(nodes[i].uc, pos, whence);
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if (result >= 0) {
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data->current = i;
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while (i)
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result += nodes[--i].size;
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}
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return result;
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}
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const URLProtocol ff_concat_protocol = {
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.name = "concat",
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.url_open = concat_open,
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.url_read = concat_read,
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.url_seek = concat_seek,
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.url_close = concat_close,
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.priv_data_size = sizeof(struct concat_data),
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};
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