[FFmpeg-cvslog] r9806 - in trunk/libavformat: Makefile avformat.h sdp.c
lucabe
subversion
Fri Jul 27 00:34:26 CEST 2007
Author: lucabe
Date: Fri Jul 27 00:34:26 2007
New Revision: 9806
Log:
Introduce an SDP generator
Added:
trunk/libavformat/sdp.c
Modified:
trunk/libavformat/Makefile
trunk/libavformat/avformat.h
Modified: trunk/libavformat/Makefile
==============================================================================
--- trunk/libavformat/Makefile (original)
+++ trunk/libavformat/Makefile Fri Jul 27 00:34:26 2007
@@ -6,7 +6,7 @@ include ../config.mak
CFLAGS+=-I$(SRC_PATH)/libavcodec
-OBJS= utils.o cutils.o os_support.o allformats.o
+OBJS= utils.o cutils.o os_support.o allformats.o sdp.o
HEADERS = avformat.h avio.h rtp.h rtsp.h rtspcodes.h
Modified: trunk/libavformat/avformat.h
==============================================================================
--- trunk/libavformat/avformat.h (original)
+++ trunk/libavformat/avformat.h Fri Jul 27 00:34:26 2007
@@ -833,6 +833,21 @@ int av_get_frame_filename(char *buf, int
*/
int av_filename_number_test(const char *filename);
+/**
+ * Generate an SDP for an RTP session.
+ *
+ * @param ac array of AVFormatContexts describing the RTP streams. If the
+ * array is composed by only one context, such context can contain
+ * multiple AVStreams (one AVStream per RTP stream). Otherwise,
+ * all the contexts in the array (an AVCodecContext per RTP stream)
+ * must contain only one AVStream
+ * @param n_streams number of AVCodecContexts contained in ac
+ * @return a pointer to the SDP (an array of chars which is allocated by
+ * avf_sdp_create(), and must be freed by the caller), or NULL in
+ * case of failure.
+ */
+char *avf_sdp_create(AVFormatContext *ac[], int n_streams);
+
#ifdef HAVE_AV_CONFIG_H
#include "os_support.h"
Added: trunk/libavformat/sdp.c
==============================================================================
--- (empty file)
+++ trunk/libavformat/sdp.c Fri Jul 27 00:34:26 2007
@@ -0,0 +1,217 @@
+/*
+ * copyright (c) 2007 Luca Abeni
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avstring.h"
+#include "avformat.h"
+
+#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
+
+struct sdp_session_level {
+ int sdp_version; /**< protocol version (currently 0) */
+ int id; /**< session id */
+ int version; /**< session version */
+ int start_time; /**< session start time (NTP time, in seconds),
+ or 0 in case of permanent session */
+ int end_time; /**< session end time (NTP time, in seconds),
+ or 0 if the session is not bounded */
+ int ttl; /**< TTL, in case of multicast stream */
+ const char *user; /**< username of the session's creator */
+ const char *src_addr; /**< IP address of the machine from which the session was created */
+ const char *dst_addr; /**< destination IP address (can be multicast) */
+ const char *name; /**< session name (can be an empty string) */
+};
+
+static void dest_write(char *buff, int size, const char *dest_addr, int ttl)
+{
+ if (dest_addr) {
+ if (ttl > 0) {
+ av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
+ } else {
+ av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
+ }
+ }
+}
+
+static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
+{
+ av_strlcatf(buff, size, "v=%d\r\n"
+ "o=- %d %d IN IPV4 %s\r\n"
+ "t=%d %d\r\n"
+ "s=%s\r\n"
+ "a=tool:libavformat\r\n",
+ s->sdp_version,
+ s->id, s->version, s->src_addr,
+ s->start_time, s->end_time,
+ s->name[0] ? s->name : "No Name");
+ dest_write(buff, size, s->dst_addr, s->ttl);
+}
+
+static int get_address(char *dest_addr, int size, int *ttl, const char *url)
+{
+ int port;
+ const char *p;
+
+ url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);
+
+ *ttl = 0;
+ p = strchr(url, '?');
+ if (p) {
+ char buff[64];
+ int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
+
+ if (is_multicast) {
+ if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
+ *ttl = strtol(buff, NULL, 10);
+ } else {
+ *ttl = 5;
+ }
+ }
+ }
+
+ return port;
+}
+
+static void digit_to_char(char *dst, uint8_t src)
+{
+ if (src < 10) {
+ *dst = '0' + src;
+ } else {
+ *dst = 'A' + src - 10;
+ }
+}
+
+static char *data_to_hex(char *buff, const uint8_t *src, int s)
+{
+ int i;
+
+ for(i = 0; i < s; i++) {
+ digit_to_char(buff + 2 * i, src[i] >> 4);
+ digit_to_char(buff + 2 * i + 1, src[i] & 0xF);
+ }
+
+ return buff;
+}
+
+static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
+{
+ char *config = NULL;
+
+ switch (c->codec_id) {
+ case CODEC_ID_MPEG4:
+ if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
+ if (c->extradata_size > MAX_EXTRADATA_SIZE) {
+ av_log(NULL, AV_LOG_ERROR, "Too many extra data!\n");
+
+ return NULL;
+ }
+ config = av_malloc(10 + c->extradata_size * 2);
+ if (config == NULL) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
+ return NULL;
+ }
+ memcpy(config, "; config=", 9);
+ data_to_hex(config + 9, c->extradata, c->extradata_size);
+ config[9 + c->extradata_size * 2] = 0;
+ }
+ av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
+ "a=fmtp:%d profile-level-id=1%s\r\n",
+ payload_type,
+ payload_type, config ? config : "");
+ break;
+ default:
+ /* Nothing special to do, here... */
+ break;
+ }
+
+ av_free(config);
+
+ return buff;
+}
+
+static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
+{
+ const char *type;
+ int payload_type;
+
+ payload_type = rtp_get_payload_type(c);
+ if (payload_type < 0) {
+ payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
+ }
+
+ switch (c->codec_type) {
+ case CODEC_TYPE_VIDEO : type = "video" ; break;
+ case CODEC_TYPE_AUDIO : type = "audio" ; break;
+ case CODEC_TYPE_SUBTITLE: type = "text" ; break;
+ default : type = "application"; break;
+ }
+
+ av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
+ dest_write(buff, size, dest_addr, ttl);
+
+ sdp_media_attributes(buff, size, c, payload_type);
+}
+
+#define SDP_BUFFER_SIZE 2048
+char *avf_sdp_create(AVFormatContext *ac[], int n_files)
+{
+ char *buff;
+ struct sdp_session_level s;
+ int i, j, port, ttl;
+ char dst[32];
+
+ buff = av_mallocz(SDP_BUFFER_SIZE);
+ if (buff == NULL) {
+ return NULL;
+ }
+
+ memset(&s, 0, sizeof(struct sdp_session_level));
+ s.user = "-";
+ s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
+ s.name = ac[0]->title;
+
+ port = 0;
+ ttl = 0;
+ if (n_files == 1) {
+ port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
+ if (port > 0) {
+ s.dst_addr = dst;
+ s.ttl = ttl;
+ }
+ }
+ sdp_write_header(buff, SDP_BUFFER_SIZE, &s);
+
+ dst[0] = 0;
+ for (i = 0; i < n_files; i++) {
+ if (n_files != 1) {
+ port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
+ }
+ for (j = 0; j < ac[i]->nb_streams; j++) {
+ sdp_write_media(buff, SDP_BUFFER_SIZE,
+ ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
+ (port > 0) ? port + j * 2 : 0, ttl);
+ if (port <= 0) {
+ av_strlcatf(buff, SDP_BUFFER_SIZE,
+ "a=control:streamid=%d\r\n", i + j);
+ }
+ }
+ }
+
+ return buff;
+}
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