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mpv/stream/stream_lavf.c
wm4 0f110ad0e2 stream_lavf: fix determining seekability
demux_lavf.c forces seek to being determined as supported if
STREAM_CTRL_HAS_AVSEEK is returned as success. But it always succeeds
with current FFmpeg versions. (Seems like Libav commit cae448cf broke
this in early 2016.)

Now we can't determine via private API whether the underlying protocol
supports read_seek anymore. The affected protocols (mostly rtmp) also
set seekable=0, meaning they signal they're not seekable, even though
read_seek would work. (My guess is that this can't be fixed because even
though seekable is in theory a combination of elaborate flags [of which
only 1 is defined, AVIO_SEEKABLE_NORMAL], a seekable!=0 always means
it's byte-seekable in some way.)

So the FFmpeg API is being garbage _again_, and all what we can do is
determining this via protocol name and a whitelist.

Should fix the behavior reported in #1701.
2016-09-26 16:49:35 +02:00

439 lines
14 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/opt.h>
#include "options/path.h"
#include "common/common.h"
#include "common/msg.h"
#include "common/tags.h"
#include "common/av_common.h"
#include "stream.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "cookies.h"
#include "misc/bstr.h"
#include "mpv_talloc.h"
#define OPT_BASE_STRUCT struct stream_lavf_params
struct stream_lavf_params {
char **avopts;
int cookies_enabled;
char *cookies_file;
char *useragent;
char *referrer;
char **http_header_fields;
int tls_verify;
char *tls_ca_file;
char *tls_cert_file;
char *tls_key_file;
double timeout;
};
const struct m_sub_options stream_lavf_conf = {
.opts = (const m_option_t[]) {
OPT_KEYVALUELIST("stream-lavf-o", avopts, 0),
OPT_STRINGLIST("http-header-fields", http_header_fields, 0),
OPT_STRING("user-agent", useragent, 0),
OPT_STRING("referrer", referrer, 0),
OPT_FLAG("cookies", cookies_enabled, 0),
OPT_STRING("cookies-file", cookies_file, M_OPT_FILE),
OPT_FLAG("tls-verify", tls_verify, 0),
OPT_STRING("tls-ca-file", tls_ca_file, M_OPT_FILE),
OPT_STRING("tls-cert-file", tls_cert_file, M_OPT_FILE),
OPT_STRING("tls-key-file", tls_key_file, M_OPT_FILE),
OPT_DOUBLE("network-timeout", timeout, M_OPT_MIN, .min = 0),
{0}
},
.size = sizeof(struct stream_lavf_params),
.defaults = &(const struct stream_lavf_params){
.useragent = (char *)mpv_version,
},
};
static const char *const http_like[];
static int open_f(stream_t *stream);
static struct mp_tags *read_icy(stream_t *stream);
static int fill_buffer(stream_t *s, char *buffer, int max_len)
{
AVIOContext *avio = s->priv;
if (!avio)
return -1;
int r = avio_read(avio, buffer, max_len);
return (r <= 0) ? -1 : r;
}
static int write_buffer(stream_t *s, char *buffer, int len)
{
AVIOContext *avio = s->priv;
if (!avio)
return -1;
avio_write(avio, buffer, len);
avio_flush(avio);
if (avio->error)
return -1;
return len;
}
static int seek(stream_t *s, int64_t newpos)
{
AVIOContext *avio = s->priv;
if (!avio)
return -1;
if (avio_seek(avio, newpos, SEEK_SET) < 0) {
return 0;
}
return 1;
}
static void close_f(stream_t *stream)
{
AVIOContext *avio = stream->priv;
/* NOTE: As of 2011 write streams must be manually flushed before close.
* Currently write_buffer() always flushes them after writing.
* avio_close() could return an error, but we have no way to return that
* with the current stream API.
*/
if (avio)
avio_close(avio);
}
static int control(stream_t *s, int cmd, void *arg)
{
AVIOContext *avio = s->priv;
if (!avio && cmd != STREAM_CTRL_RECONNECT)
return -1;
int64_t size;
switch(cmd) {
case STREAM_CTRL_GET_SIZE:
size = avio_size(avio);
if (size >= 0) {
*(int64_t *)arg = size;
return 1;
}
break;
case STREAM_CTRL_AVSEEK: {
struct stream_avseek *c = arg;
int64_t r = avio_seek_time(avio, c->stream_index, c->timestamp, c->flags);
if (r >= 0) {
stream_drop_buffers(s);
return 1;
}
break;
}
case STREAM_CTRL_HAS_AVSEEK: {
// Starting at some point, read_seek is always available, and runtime
// behavior decides whether it exists or not. FFmpeg's API doesn't
// return anything helpful to determine seekability upfront, so here's
// a hardcoded whitelist. Not our fault.
// In addition we also have to jump through ridiculous hoops just to
// get the fucking protocol name.
const char *proto = NULL;
if (avio->av_class && avio->av_class->child_next) {
// This usually yields the URLContext (why does it even exist?),
// which holds the name of the actual protocol implementation.
void *child = avio->av_class->child_next(avio, NULL);
AVClass *cl = *(AVClass **)child;
if (cl && cl->item_name)
proto = cl->item_name(child);
}
static const char *const has_read_seek[] = {
"rtmp", "rtmpt", "rtmpe", "rtmpte", "rtmps", "rtmpts", "mmsh", 0};
for (int n = 0; has_read_seek[n]; n++) {
if (avio->read_seek && proto && strcmp(proto, has_read_seek[n]) == 0)
return 1;
}
break;
}
case STREAM_CTRL_GET_METADATA: {
*(struct mp_tags **)arg = read_icy(s);
if (!*(struct mp_tags **)arg)
break;
return 1;
}
case STREAM_CTRL_RECONNECT: {
if (avio && avio->write_flag)
break; // don't bother with this
// avio doesn't seem to support this - emulate it by reopening
close_f(s);
s->priv = NULL;
stream_drop_buffers(s);
s->pos = 0;
return open_f(s);
}
}
return STREAM_UNSUPPORTED;
}
static int interrupt_cb(void *ctx)
{
struct stream *stream = ctx;
return mp_cancel_test(stream->cancel);
}
static const char * const prefix[] = { "lavf://", "ffmpeg://" };
void mp_setup_av_network_options(AVDictionary **dict, struct mpv_global *global,
struct mp_log *log)
{
void *temp = talloc_new(NULL);
struct stream_lavf_params *opts =
mp_get_config_group(temp, global, &stream_lavf_conf);
// HTTP specific options (other protocols ignore them)
if (opts->useragent)
av_dict_set(dict, "user_agent", opts->useragent, 0);
if (opts->cookies_enabled) {
char *file = opts->cookies_file;
if (file && file[0])
file = mp_get_user_path(temp, global, file);
char *cookies = cookies_lavf(temp, log, file);
if (cookies && cookies[0])
av_dict_set(dict, "cookies", cookies, 0);
}
av_dict_set(dict, "tls_verify", opts->tls_verify ? "1" : "0", 0);
if (opts->tls_ca_file)
av_dict_set(dict, "ca_file", opts->tls_ca_file, 0);
if (opts->tls_cert_file)
av_dict_set(dict, "cert_file", opts->tls_cert_file, 0);
if (opts->tls_key_file)
av_dict_set(dict, "key_file", opts->tls_key_file, 0);
char *cust_headers = talloc_strdup(temp, "");
if (opts->referrer) {
cust_headers = talloc_asprintf_append(cust_headers, "Referer: %s\r\n",
opts->referrer);
}
if (opts->http_header_fields) {
for (int n = 0; opts->http_header_fields[n]; n++) {
cust_headers = talloc_asprintf_append(cust_headers, "%s\r\n",
opts->http_header_fields[n]);
}
}
if (strlen(cust_headers))
av_dict_set(dict, "headers", cust_headers, 0);
av_dict_set(dict, "icy", "1", 0);
// So far, every known protocol uses microseconds for this
if (opts->timeout > 0) {
char buf[80];
snprintf(buf, sizeof(buf), "%lld", (long long)(opts->timeout * 1e6));
av_dict_set(dict, "timeout", buf, 0);
}
mp_set_avdict(dict, opts->avopts);
talloc_free(temp);
}
// Escape http URLs with unescaped, invalid characters in them.
// libavformat's http protocol does not do this, and a patch to add this
// in a 100% safe case (spaces only) was rejected.
static char *normalize_url(void *ta_parent, const char *filename)
{
bstr proto = mp_split_proto(bstr0(filename), NULL);
for (int n = 0; http_like[n]; n++) {
if (bstr_equals0(proto, http_like[n]))
// Escape everything but reserved characters.
// Also don't double-scape, so include '%'.
return mp_url_escape(ta_parent, filename, ":/?#[]@!$&'()*+,;=%");
}
return (char *)filename;
}
static int open_f(stream_t *stream)
{
AVIOContext *avio = NULL;
int res = STREAM_ERROR;
AVDictionary *dict = NULL;
void *temp = talloc_new(NULL);
stream->seek = NULL;
stream->seekable = false;
int flags = stream->mode == STREAM_WRITE ? AVIO_FLAG_WRITE : AVIO_FLAG_READ;
const char *filename = stream->url;
if (!filename) {
MP_ERR(stream, "No URL\n");
goto out;
}
for (int i = 0; i < sizeof(prefix) / sizeof(prefix[0]); i++)
if (!strncmp(filename, prefix[i], strlen(prefix[i])))
filename += strlen(prefix[i]);
if (!strncmp(filename, "rtsp:", 5)) {
/* This is handled as a special demuxer, without a separate
* stream layer. demux_lavf will do all the real work. Note
* that libavformat doesn't even provide a protocol entry for
* this (the rtsp demuxer's probe function checks for a "rtsp:"
* filename prefix), so it has to be handled specially here.
*/
stream->demuxer = "lavf";
stream->lavf_type = "rtsp";
talloc_free(temp);
return STREAM_OK;
}
// Replace "mms://" with "mmsh://", so that most mms:// URLs just work.
bstr b_filename = bstr0(filename);
if (bstr_eatstart0(&b_filename, "mms://") ||
bstr_eatstart0(&b_filename, "mmshttp://"))
{
filename = talloc_asprintf(temp, "mmsh://%.*s", BSTR_P(b_filename));
}
mp_setup_av_network_options(&dict, stream->global, stream->log);
AVIOInterruptCB cb = {
.callback = interrupt_cb,
.opaque = stream,
};
filename = normalize_url(stream, filename);
if (strncmp(filename, "rtmp", 4) == 0) {
stream->demuxer = "lavf";
stream->lavf_type = "flv";
// Setting timeout enables listen mode - force it to disabled.
av_dict_set(&dict, "timeout", "0", 0);
}
int err = avio_open2(&avio, filename, flags, &cb, &dict);
if (err < 0) {
if (err == AVERROR_PROTOCOL_NOT_FOUND)
MP_ERR(stream, "Protocol not found. Make sure"
" ffmpeg/Libav is compiled with networking support.\n");
goto out;
}
mp_avdict_print_unset(stream->log, MSGL_V, dict);
if (avio->av_class) {
uint8_t *mt = NULL;
if (av_opt_get(avio, "mime_type", AV_OPT_SEARCH_CHILDREN, &mt) >= 0) {
stream->mime_type = talloc_strdup(stream, mt);
av_free(mt);
}
}
stream->priv = avio;
stream->seekable = avio->seekable;
stream->seek = stream->seekable ? seek : NULL;
stream->fill_buffer = fill_buffer;
stream->write_buffer = write_buffer;
stream->control = control;
stream->close = close_f;
// enable cache (should be avoided for files, but no way to detect this)
stream->streaming = true;
res = STREAM_OK;
out:
av_dict_free(&dict);
talloc_free(temp);
return res;
}
static struct mp_tags *read_icy(stream_t *s)
{
AVIOContext *avio = s->priv;
if (!avio->av_class)
return NULL;
uint8_t *icy_header = NULL;
if (av_opt_get(avio, "icy_metadata_headers", AV_OPT_SEARCH_CHILDREN,
&icy_header) < 0)
icy_header = NULL;
uint8_t *icy_packet;
if (av_opt_get(avio, "icy_metadata_packet", AV_OPT_SEARCH_CHILDREN,
&icy_packet) < 0)
icy_packet = NULL;
// Send a metadata update only 1. on start, and 2. on a new metadata packet.
// To detect new packages, set the icy_metadata_packet to "-" once we've
// read it (a bit hacky, but works).
struct mp_tags *res = NULL;
if ((!icy_header || !icy_header[0]) && (!icy_packet || !icy_packet[0]))
goto done;
bstr packet = bstr0(icy_packet);
if (bstr_equals0(packet, "-"))
goto done;
res = talloc_zero(NULL, struct mp_tags);
bstr header = bstr0(icy_header);
while (header.len) {
bstr line = bstr_strip_linebreaks(bstr_getline(header, &header));
bstr name, val;
if (bstr_split_tok(line, ": ", &name, &val))
mp_tags_set_bstr(res, name, val);
}
bstr head = bstr0("StreamTitle='");
int i = bstr_find(packet, head);
if (i >= 0) {
packet = bstr_cut(packet, i + head.len);
int end = bstr_find(packet, bstr0("\';"));
packet = bstr_splice(packet, 0, end);
mp_tags_set_bstr(res, bstr0("icy-title"), packet);
}
av_opt_set(avio, "icy_metadata_packet", "-", AV_OPT_SEARCH_CHILDREN);
done:
av_free(icy_header);
av_free(icy_packet);
return res;
}
static const char *const http_like[] =
{"http", "https", "mmsh", "mmshttp", "httproxy", NULL};
const stream_info_t stream_info_ffmpeg = {
.name = "ffmpeg",
.open = open_f,
.protocols = (const char *const[]){
"rtmp", "rtsp", "http", "https", "mms", "mmst", "mmsh", "mmshttp", "rtp",
"httpproxy", "hls", "rtmpe", "rtmps", "rtmpt", "rtmpte", "rtmpts", "srtp",
NULL },
.can_write = true,
.is_safe = true,
.is_network = true,
};
// Unlike above, this is not marked as safe, and can contain protocols which
// may do insecure things. (Such as "ffmpeg", which can access the "lavfi"
// pseudo-demuxer, which in turn gives access to filters that can access the
// local filesystem.)
const stream_info_t stream_info_ffmpeg_unsafe = {
.name = "ffmpeg",
.open = open_f,
.protocols = (const char *const[]){
"lavf", "ffmpeg", "udp", "ftp", "tcp", "tls", "unix", "sftp", "md5",
"concat",
NULL },
.can_write = true,
};