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Diffstat (limited to 'contrib/ffmpeg/libavformat/sdp.c')
-rw-r--r--contrib/ffmpeg/libavformat/sdp.c320
1 files changed, 320 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/sdp.c b/contrib/ffmpeg/libavformat/sdp.c
new file mode 100644
index 000000000..3a71afcbe
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/sdp.c
@@ -0,0 +1,320 @@
+/*
+ * 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"
+#include "avc.h"
+#include "base64.h"
+#include "rtp.h"
+
+#ifdef CONFIG_RTP_MUXER
+#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;
+}
+
+#define MAX_PSET_SIZE 1024
+static char *extradata2psets(AVCodecContext *c)
+{
+ char *psets, *p;
+ const uint8_t *r;
+ const char *pset_string = "; sprop-parameter-sets=";
+
+ if (c->extradata_size > MAX_EXTRADATA_SIZE) {
+ av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
+
+ return NULL;
+ }
+
+ psets = av_mallocz(MAX_PSET_SIZE);
+ if (psets == NULL) {
+ av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets\n");
+ return NULL;
+ }
+ memcpy(psets, pset_string, strlen(pset_string));
+ p = psets + strlen(pset_string);
+ r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
+ while (r < c->extradata + c->extradata_size) {
+ const uint8_t *r1;
+
+ while (!*(r++));
+ r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
+ if (p != (psets + strlen(pset_string))) {
+ *p = ',';
+ p++;
+ }
+ if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
+ av_log(c, AV_LOG_ERROR, "Cannot BASE64 encode %d %d!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
+ av_free(psets);
+
+ return NULL;
+ }
+ p += strlen(p);
+ r = r1;
+ }
+
+ return psets;
+}
+
+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 *extradata2config(AVCodecContext *c)
+{
+ char *config;
+
+ if (c->extradata_size > MAX_EXTRADATA_SIZE) {
+ av_log(c, AV_LOG_ERROR, "Too many extra data!\n");
+
+ return NULL;
+ }
+ config = av_malloc(10 + c->extradata_size * 2);
+ if (config == NULL) {
+ av_log(c, 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;
+
+ return config;
+}
+
+static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
+{
+ char *config = NULL;
+
+ switch (c->codec_id) {
+ case CODEC_ID_H264:
+ if (c->extradata_size) {
+ config = extradata2psets(c);
+ }
+ av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
+ "a=fmtp:%d packetization-mode=1%s\r\n",
+ payload_type,
+ payload_type, config ? config : "");
+ break;
+ case CODEC_ID_MPEG4:
+ if (c->extradata_size) {
+ config = extradata2config(c);
+ }
+ 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;
+ case CODEC_ID_AAC:
+ if (c->extradata_size) {
+ config = extradata2config(c);
+ } else {
+ /* FIXME: maybe we can forge config information based on the
+ * codec parameters...
+ */
+ av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported\n");
+ return NULL;
+ }
+ if (config == NULL) {
+ return NULL;
+ }
+ av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
+ "a=fmtp:%d profile-level-id=1;"
+ "mode=AAC-hbr;sizelength=13;indexlength=3;"
+ "indexdeltalength=3%s\r\n",
+ payload_type, c->sample_rate, c->channels,
+ payload_type, config);
+ break;
+ case CODEC_ID_PCM_S16BE:
+ if (payload_type >= 96)
+ av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
+ payload_type,
+ c->sample_rate, c->channels);
+ break;
+ case CODEC_ID_PCM_MULAW:
+ if (payload_type >= 96)
+ av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
+ payload_type,
+ c->sample_rate, c->channels);
+ break;
+ case CODEC_ID_PCM_ALAW:
+ if (payload_type >= 96)
+ av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
+ payload_type,
+ c->sample_rate, c->channels);
+ 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);
+}
+
+int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
+{
+ struct sdp_session_level s;
+ int i, j, port, ttl;
+ char dst[32];
+
+ memset(buff, 0, size);
+ 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, 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, size,
+ ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
+ (port > 0) ? port + j * 2 : 0, ttl);
+ if (port <= 0) {
+ av_strlcatf(buff, size,
+ "a=control:streamid=%d\r\n", i + j);
+ }
+ }
+ }
+
+ return 0;
+}
+#else
+int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
+{
+ return AVERROR(ENOSYS);
+}
+#endif
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