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-rw-r--r--libavformat/udp.c191
1 files changed, 184 insertions, 7 deletions
diff --git a/libavformat/udp.c b/libavformat/udp.c
index 71b445b187..e8493b5df2 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -2,20 +2,20 @@
* UDP prototype streaming system
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -29,17 +29,26 @@
#include "avformat.h"
#include "avio_internal.h"
#include "libavutil/parseutils.h"
+#include "libavutil/fifo.h"
+#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
+#if HAVE_PTHREAD_CANCEL
+#include <pthread.h>
+#endif
+
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
+#define UDP_TX_BUF_SIZE 32768
+#define UDP_MAX_PKT_SIZE 65536
+
typedef struct {
int udp_fd;
int ttl;
@@ -47,13 +56,24 @@ typedef struct {
int is_multicast;
int local_port;
int reuse_socket;
+ int overrun_nonfatal;
struct sockaddr_storage dest_addr;
int dest_addr_len;
int is_connected;
-} UDPContext;
-#define UDP_TX_BUF_SIZE 32768
-#define UDP_MAX_PKT_SIZE 65536
+ /* Circular Buffer variables for use in UDP receive code */
+ int circular_buffer_size;
+ AVFifoBuffer *fifo;
+ int circular_buffer_error;
+#if HAVE_PTHREAD_CANCEL
+ pthread_t circular_buffer_thread;
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+ int thread_started;
+#endif
+ uint8_t tmp[UDP_MAX_PKT_SIZE+4];
+ int remaining_in_dg;
+} UDPContext;
static void log_net_error(void *ctx, int level, const char* prefix)
{
@@ -244,6 +264,7 @@ static int udp_port(struct sockaddr_storage *addr, int addr_len)
* 'localport=n' : set the local port
* 'pkt_size=n' : set max packet size
* 'reuse=1' : enable reusing the socket
+ * 'overrun_nonfatal=1': survive in case of circular buffer overrun
*
* @param h media file context
* @param uri of the remote server
@@ -305,6 +326,61 @@ static int udp_get_file_handle(URLContext *h)
return s->udp_fd;
}
+#if HAVE_PTHREAD_CANCEL
+static void *circular_buffer_task( void *_URLContext)
+{
+ URLContext *h = _URLContext;
+ UDPContext *s = h->priv_data;
+ int old_cancelstate;
+
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
+ ff_socket_nonblock(s->udp_fd, 0);
+ pthread_mutex_lock(&s->mutex);
+ while(1) {
+ int len;
+
+ pthread_mutex_unlock(&s->mutex);
+ /* Blocking operations are always cancellation points;
+ see "General Information" / "Thread Cancelation Overview"
+ in Single Unix. */
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
+ len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
+ pthread_mutex_lock(&s->mutex);
+ if (len < 0) {
+ if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
+ s->circular_buffer_error = ff_neterrno();
+ goto end;
+ }
+ continue;
+ }
+ AV_WL32(s->tmp, len);
+
+ if(av_fifo_space(s->fifo) < len + 4) {
+ /* No Space left */
+ if (s->overrun_nonfatal) {
+ av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
+ "Surviving due to overrun_nonfatal option\n");
+ continue;
+ } else {
+ av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
+ "To avoid, increase fifo_size URL option. "
+ "To survive in such case, use overrun_nonfatal option\n");
+ s->circular_buffer_error = AVERROR(EIO);
+ goto end;
+ }
+ }
+ av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
+ pthread_cond_signal(&s->cond);
+ }
+
+end:
+ pthread_cond_signal(&s->cond);
+ pthread_mutex_unlock(&s->mutex);
+ return NULL;
+}
+#endif
+
/* put it in UDP context */
/* return non zero if error */
static int udp_open(URLContext *h, const char *uri, int flags)
@@ -327,6 +403,8 @@ static int udp_open(URLContext *h, const char *uri, int flags)
s->ttl = 16;
s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
+ s->circular_buffer_size = 7*188*4096;
+
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
@@ -337,6 +415,13 @@ static int udp_open(URLContext *h, const char *uri, int flags)
s->reuse_socket = 1;
reuse_specified = 1;
}
+ if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
+ char *endptr = NULL;
+ s->overrun_nonfatal = strtol(buf, &endptr, 10);
+ /* assume if no digits were found it is a request to enable it */
+ if (buf == endptr)
+ s->overrun_nonfatal = 1;
+ }
if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
s->ttl = strtol(buf, NULL, 10);
}
@@ -352,6 +437,9 @@ static int udp_open(URLContext *h, const char *uri, int flags)
if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
s->is_connected = strtol(buf, NULL, 10);
}
+ if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
+ s->circular_buffer_size = strtol(buf, NULL, 10)*188;
+ }
if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
av_strlcpy(localaddr, buf, sizeof(localaddr));
}
@@ -442,10 +530,43 @@ static int udp_open(URLContext *h, const char *uri, int flags)
}
s->udp_fd = udp_fd;
+
+#if HAVE_PTHREAD_CANCEL
+ if (!is_output && s->circular_buffer_size) {
+ int ret;
+
+ /* start the task going */
+ s->fifo = av_fifo_alloc(s->circular_buffer_size);
+ ret = pthread_mutex_init(&s->mutex, NULL);
+ if (ret != 0) {
+ av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
+ goto fail;
+ }
+ ret = pthread_cond_init(&s->cond, NULL);
+ if (ret != 0) {
+ av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
+ goto cond_fail;
+ }
+ ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
+ if (ret != 0) {
+ av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
+ goto thread_fail;
+ }
+ s->thread_started = 1;
+ }
+#endif
+
return 0;
+#if HAVE_PTHREAD_CANCEL
+ thread_fail:
+ pthread_cond_destroy(&s->cond);
+ cond_fail:
+ pthread_mutex_destroy(&s->mutex);
+#endif
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
+ av_fifo_free(s->fifo);
return AVERROR(EIO);
}
@@ -453,6 +574,48 @@ static int udp_read(URLContext *h, uint8_t *buf, int size)
{
UDPContext *s = h->priv_data;
int ret;
+ int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
+
+#if HAVE_PTHREAD_CANCEL
+ if (s->fifo) {
+ pthread_mutex_lock(&s->mutex);
+ do {
+ avail = av_fifo_size(s->fifo);
+ if (avail) { // >=size) {
+ uint8_t tmp[4];
+
+ av_fifo_generic_read(s->fifo, tmp, 4, NULL);
+ avail= AV_RL32(tmp);
+ if(avail > size){
+ av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
+ avail= size;
+ }
+
+ av_fifo_generic_read(s->fifo, buf, avail, NULL);
+ av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
+ pthread_mutex_unlock(&s->mutex);
+ return avail;
+ } else if(s->circular_buffer_error){
+ int err = s->circular_buffer_error;
+ pthread_mutex_unlock(&s->mutex);
+ return err;
+ } else if(nonblock) {
+ pthread_mutex_unlock(&s->mutex);
+ return AVERROR(EAGAIN);
+ }
+ else {
+ /* FIXME: using the monotonic clock would be better,
+ but it does not exist on all supported platforms. */
+ int64_t t = av_gettime() + 100000;
+ struct timespec tv = { .tv_sec = t / 1000000,
+ .tv_nsec = (t % 1000000) * 1000 };
+ if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0)
+ return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
+ nonblock = 1;
+ }
+ } while( 1);
+ }
+#endif
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd(s->udp_fd, 0);
@@ -460,6 +623,7 @@ static int udp_read(URLContext *h, uint8_t *buf, int size)
return ret;
}
ret = recv(s->udp_fd, buf, size, 0);
+
return ret < 0 ? ff_neterrno() : ret;
}
@@ -487,10 +651,23 @@ static int udp_write(URLContext *h, const uint8_t *buf, int size)
static int udp_close(URLContext *h)
{
UDPContext *s = h->priv_data;
+ int ret;
if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
closesocket(s->udp_fd);
+ av_fifo_free(s->fifo);
+#if HAVE_PTHREAD_CANCEL
+ if (s->thread_started) {
+ pthread_cancel(s->circular_buffer_thread);
+ ret = pthread_join(s->circular_buffer_thread, NULL);
+ if (ret != 0)
+ av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
+ }
+
+ pthread_mutex_destroy(&s->mutex);
+ pthread_cond_destroy(&s->cond);
+#endif
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 20:59:37 +0000