mpv/stream/stream_lavf.c

441 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 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 <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 "misc/thread_tools.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;
char *http_proxy;
};
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),
OPT_STRING("http-proxy", http_proxy, 0),
{0}
},
.size = sizeof(struct stream_lavf_params),
.defaults = &(const struct stream_lavf_params){
.useragent = (char *)mpv_version,
.timeout = 60,
},
};
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, void *buffer, int max_len)
{
AVIOContext *avio = s->priv;
#if LIBAVFORMAT_VERSION_MICRO >= 100 && LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 81, 100)
int r = avio_read_partial(avio, buffer, max_len);
#else
int r = avio_read(avio, buffer, max_len);
#endif
return (r <= 0) ? -1 : r;
}
static int write_buffer(stream_t *s, void *buffer, int len)
{
AVIOContext *avio = s->priv;
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_seek(avio, newpos, SEEK_SET) < 0) {
return 0;
}
return 1;
}
static int64_t get_size(stream_t *s)
{
AVIOContext *avio = s->priv;
return avio_size(avio);
}
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;
switch(cmd) {
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;
}
}
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, const char *target_fmt,
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
// Except rtsp.
if (opts->timeout > 0) {
if (target_fmt && strcmp(target_fmt, "rtsp") == 0) {
mp_verbose(log, "Broken FFmpeg RTSP API => not setting timeout.\n");
} else {
char buf[80];
snprintf(buf, sizeof(buf), "%lld", (long long)(opts->timeout * 1e6));
av_dict_set(dict, "timeout", buf, 0);
}
}
if (opts->http_proxy && opts->http_proxy[0])
av_dict_set(dict, "http_proxy", opts->http_proxy, 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));
}
av_dict_set(&dict, "reconnect", "1", 0);
av_dict_set(&dict, "reconnect_delay_max", "7", 0);
mp_setup_av_network_options(&dict, NULL, 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 & AVIO_SEEKABLE_NORMAL;
stream->seek = stream->seekable ? seek : NULL;
stream->fill_buffer = fill_buffer;
stream->write_buffer = write_buffer;
stream->get_size = get_size;
stream->control = control;
stream->close = close_f;
// enable cache (should be avoided for files, but no way to detect this)
stream->streaming = true;
if (stream->info->stream_origin == STREAM_ORIGIN_NET)
stream->is_network = 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", "rtmpe", "rtmps", "rtmpt", "rtmpte", "rtmpts", "srtp",
"gopher", "data",
NULL },
.can_write = true,
.stream_origin = STREAM_ORIGIN_NET,
};
// 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 },
.stream_origin = STREAM_ORIGIN_UNSAFE,
.can_write = true,
};