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mpv/stream/stream_memory.c
wm4 e40885d963 stream: create memory streams in more straightforward way
Instead of having to rely on the protocol matching, make a function that
creates a stream from a stream_info_t directly. Instead of going through
a weird indirection with STREAM_CTRL, add a direct argument for non-text
arguments to the open callback. Instead of creating a weird dummy
mpv_global, just pass an existing one from all callers. (The latter one
is just an artifact from the past, where mpv_global wasn't available
everywhere.)

Actually I just wanted a function that creates a stream without any of
that bullshit. This goal was slightly missed, since you still need this
heavy "constructor" just to setup a shitty struct with some shitty
callbacks.
2019-09-19 20:37:05 +02:00

100 lines
2.5 KiB
C

/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavutil/common.h>
#include "common/common.h"
#include "stream.h"
struct priv {
bstr data;
};
static int fill_buffer(stream_t *s, char* buffer, int len)
{
struct priv *p = s->priv;
bstr data = p->data;
if (s->pos < 0 || s->pos > data.len)
return 0;
len = FFMIN(len, data.len - s->pos);
memcpy(buffer, data.start + s->pos, len);
return len;
}
static int seek(stream_t *s, int64_t newpos)
{
return 1;
}
static int control(stream_t *s, int cmd, void *arg)
{
struct priv *p = s->priv;
if (cmd == STREAM_CTRL_GET_SIZE) {
*(int64_t *)arg = p->data.len;
return 1;
}
return STREAM_UNSUPPORTED;
}
static int open2(stream_t *stream, void *arg)
{
stream->fill_buffer = fill_buffer;
stream->seek = seek;
stream->seekable = true;
stream->control = control;
stream->read_chunk = 1024 * 1024;
struct priv *p = talloc_zero(stream, struct priv);
stream->priv = p;
// Initial data
bstr data = bstr0(stream->url);
bool use_hex = bstr_eatstart0(&data, "hex://");
if (!use_hex)
bstr_eatstart0(&data, "memory://");
if (arg)
data = *(bstr *)arg;
p->data = bstrdup(stream, data);
if (use_hex && !bstr_decode_hex(stream, p->data, &p->data)) {
MP_FATAL(stream, "Invalid data.\n");
return STREAM_ERROR;
}
return STREAM_OK;
}
const stream_info_t stream_info_memory = {
.name = "memory",
.open2 = open2,
.protocols = (const char*const[]){ "memory", "hex", NULL },
};
struct stream *stream_memory_open(struct mpv_global *global, void *data, int len)
{
assert(len >= 0);
struct stream *s = NULL;
stream_create_instance(&stream_info_memory, "memory://",
STREAM_READ | STREAM_SILENT, NULL, global,
&(bstr){data, len}, &s);
MP_HANDLE_OOM(s);
return s;
}