gstreamer/subprojects/gst-examples/network/http-launch/http-launch.c

542 lines
14 KiB
C

/*
* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gio/gio.h>
typedef struct
{
gchar *name;
GSocketConnection *connection;
GSocket *socket;
GInputStream *istream;
GOutputStream *ostream;
GSource *isource, *tosource;
GByteArray *current_message;
gchar *http_version;
gboolean waiting_200_ok;
} Client;
static const char *known_mimetypes[] = {
"video/webm",
"multipart/x-mixed-replace",
NULL
};
static GMainLoop *loop = NULL;
G_LOCK_DEFINE_STATIC (clients);
static GList *clients = NULL;
static GstElement *pipeline = NULL;
static GstElement *multisocketsink = NULL;
static gboolean started = FALSE;
static gchar *content_type;
G_LOCK_DEFINE_STATIC (caps);
static gboolean caps_resolved = FALSE;
static void
remove_client (Client * client)
{
gst_print ("Removing connection %s\n", client->name);
G_LOCK (clients);
clients = g_list_remove (clients, client);
G_UNLOCK (clients);
g_free (client->name);
g_free (client->http_version);
if (client->isource) {
g_source_destroy (client->isource);
g_source_unref (client->isource);
}
if (client->tosource) {
g_source_destroy (client->tosource);
g_source_unref (client->tosource);
}
g_object_unref (client->connection);
g_byte_array_unref (client->current_message);
g_slice_free (Client, client);
}
static void
write_bytes (Client * client, const gchar * data, guint len)
{
gssize w;
GError *err = NULL;
/* TODO: We assume this never blocks */
do {
w = g_output_stream_write (client->ostream, data, len, NULL, &err);
if (w > 0) {
len -= w;
data += w;
}
} while (w > 0 && len > 0);
if (w <= 0) {
if (err) {
gst_print ("Write error %s\n", err->message);
g_clear_error (&err);
}
remove_client (client);
}
}
static void
send_response_200_ok (Client * client)
{
gchar *response;
response = g_strdup_printf ("%s 200 OK\r\n%s\r\n", client->http_version,
content_type);
write_bytes (client, response, strlen (response));
g_free (response);
}
static void
send_response_404_not_found (Client * client)
{
gchar *response;
response = g_strdup_printf ("%s 404 Not Found\r\n\r\n", client->http_version);
write_bytes (client, response, strlen (response));
g_free (response);
}
static void
client_message (Client * client, const gchar * data, guint len)
{
gboolean http_head_request = FALSE;
gboolean http_get_request = FALSE;
gchar **lines = g_strsplit_set (data, "\r\n", -1);
if (g_str_has_prefix (lines[0], "HEAD"))
http_head_request = TRUE;
else if (g_str_has_prefix (lines[0], "GET"))
http_get_request = TRUE;
if (http_head_request || http_get_request) {
gchar **parts = g_strsplit (lines[0], " ", -1);
gboolean ok = FALSE;
g_free (client->http_version);
if (parts[1] && parts[2] && *parts[2] != '\0')
client->http_version = g_strdup (parts[2]);
else
client->http_version = g_strdup ("HTTP/1.0");
if (parts[1] && strcmp (parts[1], "/") == 0) {
G_LOCK (caps);
if (caps_resolved)
send_response_200_ok (client);
else
client->waiting_200_ok = TRUE;
G_UNLOCK (caps);
ok = TRUE;
} else {
send_response_404_not_found (client);
}
g_strfreev (parts);
if (ok) {
if (http_get_request) {
/* Start streaming to client socket */
g_source_destroy (client->isource);
g_source_unref (client->isource);
client->isource = NULL;
g_source_destroy (client->tosource);
g_source_unref (client->tosource);
client->tosource = NULL;
gst_print ("Starting to stream to %s\n", client->name);
g_signal_emit_by_name (multisocketsink, "add", client->socket);
}
if (!started) {
gst_print ("Starting pipeline\n");
if (gst_element_set_state (pipeline,
GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
gst_print ("Failed to start pipeline\n");
g_main_loop_quit (loop);
}
started = TRUE;
}
}
} else {
gchar **parts = g_strsplit (lines[0], " ", -1);
gchar *response;
const gchar *http_version;
if (parts[1] && parts[2] && *parts[2] != '\0')
http_version = parts[2];
else
http_version = "HTTP/1.0";
response = g_strdup_printf ("%s 400 Bad Request\r\n\r\n", http_version);
write_bytes (client, response, strlen (response));
g_free (response);
g_strfreev (parts);
remove_client (client);
}
g_strfreev (lines);
}
static gboolean
on_timeout (Client * client)
{
gst_print ("Timeout\n");
remove_client (client);
return FALSE;
}
static gboolean
on_read_bytes (GPollableInputStream * stream, Client * client)
{
gssize r;
gchar data[4096];
GError *err = NULL;
do {
r = g_pollable_input_stream_read_nonblocking (G_POLLABLE_INPUT_STREAM
(client->istream), data, sizeof (data), NULL, &err);
if (r > 0)
g_byte_array_append (client->current_message, (guint8 *) data, r);
} while (r > 0);
if (r == 0) {
remove_client (client);
return FALSE;
} else if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK)) {
guint8 *tmp = client->current_message->data;
guint tmp_len = client->current_message->len;
g_clear_error (&err);
while (tmp_len > 3) {
if (tmp[0] == 0x0d && tmp[1] == 0x0a && tmp[2] == 0x0d && tmp[3] == 0x0a) {
guint len;
g_byte_array_append (client->current_message, (const guint8 *) "\0", 1);
len = tmp - client->current_message->data + 5;
client_message (client, (gchar *) client->current_message->data, len);
g_byte_array_remove_range (client->current_message, 0, len);
tmp = client->current_message->data;
tmp_len = client->current_message->len;
} else {
tmp++;
tmp_len--;
}
}
if (client->current_message->len >= 1024 * 1024) {
gst_print ("No complete request after 1MB of data\n");
remove_client (client);
return FALSE;
}
return TRUE;
} else {
gst_print ("Read error %s\n", err->message);
g_clear_error (&err);
remove_client (client);
return FALSE;
}
return FALSE;
}
static gboolean
on_new_connection (GSocketService * service, GSocketConnection * connection,
GObject * source_object, gpointer user_data)
{
Client *client = g_slice_new0 (Client);
GSocketAddress *addr;
GInetAddress *iaddr;
gchar *ip;
guint16 port;
addr = g_socket_connection_get_remote_address (connection, NULL);
iaddr = g_inet_socket_address_get_address (G_INET_SOCKET_ADDRESS (addr));
port = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (addr));
ip = g_inet_address_to_string (iaddr);
client->name = g_strdup_printf ("%s:%u", ip, port);
g_free (ip);
g_object_unref (addr);
gst_print ("New connection %s\n", client->name);
client->waiting_200_ok = FALSE;
client->http_version = g_strdup ("");
client->connection = g_object_ref (connection);
client->socket = g_socket_connection_get_socket (connection);
client->istream =
g_io_stream_get_input_stream (G_IO_STREAM (client->connection));
client->ostream =
g_io_stream_get_output_stream (G_IO_STREAM (client->connection));
client->current_message = g_byte_array_sized_new (1024);
client->tosource = g_timeout_source_new_seconds (5);
g_source_set_callback (client->tosource, (GSourceFunc) on_timeout, client,
NULL);
g_source_attach (client->tosource, NULL);
client->isource =
g_pollable_input_stream_create_source (G_POLLABLE_INPUT_STREAM
(client->istream), NULL);
g_source_set_callback (client->isource, (GSourceFunc) on_read_bytes, client,
NULL);
g_source_attach (client->isource, NULL);
G_LOCK (clients);
clients = g_list_prepend (clients, client);
G_UNLOCK (clients);
return TRUE;
}
static gboolean
on_message (GstBus * bus, GstMessage * message, gpointer user_data)
{
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
gchar *debug;
GError *err;
gst_message_parse_error (message, &err, &debug);
gst_print ("Error %s\n", err->message);
g_error_free (err);
g_free (debug);
g_main_loop_quit (loop);
break;
}
case GST_MESSAGE_WARNING:{
gchar *debug;
GError *err;
gst_message_parse_warning (message, &err, &debug);
gst_print ("Warning %s\n", err->message);
g_error_free (err);
g_free (debug);
break;
}
case GST_MESSAGE_EOS:{
gst_print ("EOS\n");
g_main_loop_quit (loop);
}
default:
break;
}
return TRUE;
}
static void
on_client_socket_removed (GstElement * element, GSocket * socket,
gpointer user_data)
{
GList *l;
Client *client = NULL;
G_LOCK (clients);
for (l = clients; l; l = l->next) {
Client *tmp = l->data;
if (socket == tmp->socket) {
client = tmp;
break;
}
}
G_UNLOCK (clients);
if (client)
remove_client (client);
}
static void
on_stream_caps_changed (GObject * obj, GParamSpec * pspec, gpointer user_data)
{
GstPad *src_pad;
GstCaps *src_caps;
GstStructure *gstrc;
GList *l;
src_pad = (GstPad *) obj;
src_caps = gst_pad_get_current_caps (src_pad);
gstrc = gst_caps_get_structure (src_caps, 0);
/*
* Include a Content-type header in the case we know the mime
* type is OK in HTTP. Required for MJPEG streams.
*/
int i = 0;
const gchar *mimetype = gst_structure_get_name (gstrc);
while (known_mimetypes[i] != NULL) {
if (strcmp (mimetype, known_mimetypes[i]) == 0) {
if (content_type)
g_free (content_type);
/* Handle the (maybe not so) especial case of multipart to add boundary */
if (strcmp (mimetype, "multipart/x-mixed-replace") == 0 &&
gst_structure_has_field_typed (gstrc, "boundary", G_TYPE_STRING)) {
const gchar *boundary = gst_structure_get_string (gstrc, "boundary");
content_type = g_strdup_printf ("Content-Type: "
"multipart/x-mixed-replace;boundary=--%s\r\n", boundary);
} else {
content_type = g_strdup_printf ("Content-Type: %s\r\n", mimetype);
}
gst_print ("%s", content_type);
break;
}
i++;
}
gst_caps_unref (src_caps);
/* Send 200 OK to those clients waiting for it */
G_LOCK (caps);
caps_resolved = TRUE;
G_LOCK (clients);
for (l = clients; l; l = l->next) {
Client *cl = l->data;
if (cl->waiting_200_ok) {
send_response_200_ok (cl);
cl->waiting_200_ok = FALSE;
break;
}
}
G_UNLOCK (clients);
G_UNLOCK (caps);
}
int
main (gint argc, gchar ** argv)
{
GSocketService *service;
GstElement *bin, *stream;
GstPad *srcpad, *ghostpad, *sinkpad;
GError *err = NULL;
GstBus *bus;
gst_init (&argc, &argv);
if (argc < 4) {
gst_print ("usage: %s PORT <launch line>\n"
"example: %s 8080 ( videotestsrc ! theoraenc ! oggmux name=stream )\n",
argv[0], argv[0]);
return -1;
}
const gchar *port_str = argv[1];
const int port = (int) g_ascii_strtoll (port_str, NULL, 10);
bin = gst_parse_launchv ((const gchar **) argv + 2, &err);
if (!bin) {
gst_print ("invalid pipeline: %s\n", err->message);
g_clear_error (&err);
return -2;
}
stream = gst_bin_get_by_name (GST_BIN (bin), "stream");
if (!stream) {
gst_print ("no element with name \"stream\" found\n");
gst_object_unref (bin);
return -3;
}
srcpad = gst_element_get_static_pad (stream, "src");
if (!srcpad) {
gst_print ("no \"src\" pad in element \"stream\" found\n");
gst_object_unref (stream);
gst_object_unref (bin);
return -4;
}
content_type = g_strdup ("");
g_signal_connect (srcpad, "notify::caps",
G_CALLBACK (on_stream_caps_changed), NULL);
ghostpad = gst_ghost_pad_new ("src", srcpad);
gst_element_add_pad (GST_ELEMENT (bin), ghostpad);
gst_object_unref (srcpad);
pipeline = gst_pipeline_new (NULL);
multisocketsink = gst_element_factory_make ("multisocketsink", NULL);
g_object_set (multisocketsink,
"unit-format", GST_FORMAT_TIME,
"units-max", (gint64) 7 * GST_SECOND,
"units-soft-max", (gint64) 3 * GST_SECOND,
"recover-policy", 3 /* keyframe */ ,
"timeout", (guint64) 10 * GST_SECOND,
"sync-method", 1 /* next-keyframe */ ,
NULL);
gst_bin_add_many (GST_BIN (pipeline), bin, multisocketsink, NULL);
sinkpad = gst_element_get_static_pad (multisocketsink, "sink");
gst_pad_link (ghostpad, sinkpad);
gst_object_unref (sinkpad);
bus = gst_element_get_bus (pipeline);
gst_bus_add_signal_watch (bus);
g_signal_connect (bus, "message", G_CALLBACK (on_message), NULL);
gst_object_unref (bus);
g_signal_connect (multisocketsink, "client-socket-removed",
G_CALLBACK (on_client_socket_removed), NULL);
loop = g_main_loop_new (NULL, FALSE);
if (gst_element_set_state (pipeline,
GST_STATE_READY) == GST_STATE_CHANGE_FAILURE) {
gst_object_unref (pipeline);
g_main_loop_unref (loop);
gst_print ("Failed to set pipeline to ready\n");
return -5;
}
service = g_socket_service_new ();
g_socket_listener_add_inet_port (G_SOCKET_LISTENER (service), port, NULL,
NULL);
g_signal_connect (service, "incoming", G_CALLBACK (on_new_connection), NULL);
g_socket_service_start (service);
gst_print ("Listening on http://127.0.0.1:%d/\n", port);
g_main_loop_run (loop);
g_socket_service_stop (service);
g_object_unref (service);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
g_main_loop_unref (loop);
return 0;
}