static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
int letter, const char *buf)
{
RTSPState *rt = s->priv_data;
char buf1[64], st_type[64];
const char *p;
int codec_type, payload_type, i;
AVStream *st;
RTSPStream *rtsp_st;
struct in_addr sdp_ip;
int ttl;
#ifdef DEBUG
printf("sdp: %c='%s'\n", letter, buf);
#endif
p = buf;
switch(letter) {
case 'c':
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IN") != 0)
return;
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IP4") != 0)
return;
get_word_sep(buf1, sizeof(buf1), "/", &p);
if (inet_aton(buf1, &sdp_ip) == 0)
return;
ttl = 16;
if (*p == '/') {
p++;
get_word_sep(buf1, sizeof(buf1), "/", &p);
ttl = atoi(buf1);
}
if (s->nb_streams == 0) {
s1->default_ip = sdp_ip;
s1->default_ttl = ttl;
} else {
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
rtsp_st->sdp_ip = sdp_ip;
rtsp_st->sdp_ttl = ttl;
}
break;
case 's':
av_strlcpy(s->title, p, sizeof(s->title));
break;
case 'i':
if (s->nb_streams == 0) {
av_strlcpy(s->comment, p, sizeof(s->comment));
break;
}
break;
case 'm':
/* new stream */
get_word(st_type, sizeof(st_type), &p);
if (!strcmp(st_type, "audio")) {
codec_type = CODEC_TYPE_AUDIO;
} else if (!strcmp(st_type, "video")) {
codec_type = CODEC_TYPE_VIDEO;
} else {
return;
}
rtsp_st = av_mallocz(sizeof(RTSPStream));
if (!rtsp_st)
return;
rtsp_st->stream_index = -1;
dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
rtsp_st->sdp_ip = s1->default_ip;
rtsp_st->sdp_ttl = s1->default_ttl;
get_word(buf1, sizeof(buf1), &p); /* port */
rtsp_st->sdp_port = atoi(buf1);
get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
/* XXX: handle list of formats */
get_word(buf1, sizeof(buf1), &p); /* format list */
rtsp_st->sdp_payload_type = atoi(buf1);
if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
/* no corresponding stream */
} else {
st = av_new_stream(s, 0);
if (!st)
return;
st->priv_data = rtsp_st;
rtsp_st->stream_index = st->index;
st->codec->codec_type = codec_type;
if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
/* if standard payload type, we can find the codec right now */
rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
}
}
/* put a default control url */
av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
break;
case 'a':
if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
char proto[32];
/* get the control url */
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
/* XXX: may need to add full url resolution */
url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
if (proto[0] == '\0') {
/* relative control URL */
av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
} else {
av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
}
} else if (av_strstart(p, "rtpmap:", &p)) {
/* NOTE: rtpmap is only supported AFTER the 'm=' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
}
}
} else if (av_strstart(p, "fmtp:", &p)) {
/* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
sdp_parse_fmtp(st, p);
}
} else {
sdp_parse_fmtp(st, p);
}
}
}
} else if(av_strstart(p, "framesize:", &p)) {
// let dynamic protocol handlers have a stab at the line.
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
}
}
}
} else if(av_strstart(p, "range:", &p)) {
int64_t start, end;
// this is so that seeking on a streamed file can work.
rtsp_parse_range_npt(p, &start, &end);
s->start_time= start;
s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
} else if (s->nb_streams > 0) {
rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
if (rtsp_st->dynamic_handler &&
rtsp_st->dynamic_handler->parse_sdp_a_line)
rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
rtsp_st->dynamic_protocol_context, buf);
}
break;
}
}
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
int letter, const char *buf)
{
RTSPState *rt = s->priv_data;
char buf1[64], st_type[64];
const char *p;
int codec_type, payload_type, i;
AVStream *st;
RTSPStream *rtsp_st;
struct in_addr sdp_ip;
int ttl;
#ifdef DEBUG
printf("sdp: %c='%s'\n", letter, buf);
#endif
p = buf;
switch(letter) {
case 'c':
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IN") != 0)
return;
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IP4") != 0)
return;
get_word_sep(buf1, sizeof(buf1), "/", &p);
if (inet_aton(buf1, &sdp_ip) == 0)
return;
ttl = 16;
if (*p == '/') {
p++;
get_word_sep(buf1, sizeof(buf1), "/", &p);
ttl = atoi(buf1);
}
if (s->nb_streams == 0) {
s1->default_ip = sdp_ip;
s1->default_ttl = ttl;
} else {
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
rtsp_st->sdp_ip = sdp_ip;
rtsp_st->sdp_ttl = ttl;
}
break;
case 's':
pstrcpy(s->title, sizeof(s->title), p);
break;
case 'i':
if (s->nb_streams == 0) {
pstrcpy(s->comment, sizeof(s->comment), p);
break;
}
break;
case 'm':
/* new stream */
get_word(st_type, sizeof(st_type), &p);
if (!strcmp(st_type, "audio")) {
codec_type = CODEC_TYPE_AUDIO;
} else if (!strcmp(st_type, "video")) {
codec_type = CODEC_TYPE_VIDEO;
} else {
return;
}
rtsp_st = av_mallocz(sizeof(RTSPStream));
if (!rtsp_st)
return;
rtsp_st->stream_index = -1;
dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
rtsp_st->sdp_ip = s1->default_ip;
rtsp_st->sdp_ttl = s1->default_ttl;
get_word(buf1, sizeof(buf1), &p); /* port */
rtsp_st->sdp_port = atoi(buf1);
get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
/* XXX: handle list of formats */
get_word(buf1, sizeof(buf1), &p); /* format list */
rtsp_st->sdp_payload_type = atoi(buf1);
if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
/* no corresponding stream */
} else {
st = av_new_stream(s, 0);
if (!st)
return;
st->priv_data = rtsp_st;
rtsp_st->stream_index = st->index;
st->codec->codec_type = codec_type;
if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
/* if standard payload type, we can find the codec right now */
rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
}
}
/* put a default control url */
pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), s->filename);
break;
case 'a':
if (strstart(p, "control:", &p) && s->nb_streams > 0) {
char proto[32];
/* get the control url */
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
/* XXX: may need to add full url resolution */
url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
if (proto[0] == '\0') {
/* relative control URL */
pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), "/");
pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
} else {
pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
}
} else if (strstart(p, "rtpmap:", &p)) {
/* NOTE: rtpmap is only supported AFTER the 'm=' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
sdp_parse_rtpmap(st->codec, payload_type, p);
}
}
} else if (strstart(p, "fmtp:", &p)) {
/* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
sdp_parse_fmtp(st, p);
}
}
}
break;
}
}
/**
* Parse an RTP packet directly sent as raw data. Can only be used if
* 'raw' is given as input file
* @param s1 media file context
* @param pkt returned packet
* @param buf input buffer
* @param len buffer len
* @return zero if no error.
*/
int rtp_parse_packet(AVFormatContext *s1, AVPacket *pkt,
const unsigned char *buf, int len)
{
RTPContext *s = s1->priv_data;
unsigned int ssrc, h;
int payload_type, seq, delta_timestamp,idx;
AVStream *st;
uint32_t timestamp;
if (len < 12)
return -1;
if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
return -1;
if (buf[1] >= 200 && buf[1] <= 204) {
rtcp_parse_packet(s1, buf, len);
if(pkt&&(pkt->data!=0))
{
//printf("free_packet\n");fflush(stdout);
av_free_packet(pkt);
}
if(s->profile.a_size>0)
s->seq=s->profile.a_seq-1;
else if(s->profile.v_size>0)
s->seq=s->profile.v_seq-1;
else
return -1;
s->a_offset=0;
s->v_offset=0;
switch_order=1;
s->first_rtcp=1; //need the first video rtcp packet for re-sync
return -1;
}
payload_type = buf[1] & 0x7f;
seq = (buf[2] << 8) | buf[3];
timestamp = decode_be32(buf + 4);
ssrc = decode_be32(buf + 8);
#ifdef DEBUG //1
printf("payload_type %d, seq=%d timestamp=0x%x first_rtcp=%d\n",payload_type,seq,timestamp,s->first_rtcp);
fflush(stdout);
#endif
if(s->first_rtcp==0)
{
//printf("NO first rtcp comming!\n");
switch_order=0;
return -1;
}
#if 1 //ivan
if(s->payload_record[0]<0)
s->payload_record[0] = payload_type;
else if(s->payload_record[1]<0)
s->payload_record[1] = payload_type;
if((payload_type==RTP_PT_MPEG4VIDEO)||(payload_type==RTP_PT_MJPEG)||(payload_type==RTP_PT_H264))
idx=0;
else if(payload_type==RTP_PT_ADPCM)
idx=1;
else
return -1;
#else
if (s->payload_type < 0) {
s->payload_type = payload_type;
if (payload_type == RTP_PT_MPEG2TS) {
/* XXX: special case : not a single codec but a whole stream */
return -1;
} else {
st = av_new_stream(s1, 0);
if (!st)
return -1;
rtp_get_codec_info(&st->codec, payload_type);
}
}
/* NOTE: we can handle only one payload type */
if (s->payload_type != payload_type)
return -1;
#endif
#if defined(DEBUG) || 1
if(seq != 0) //ivan
if (seq != ((s->seq + 1) & 0xffff)) {
printf("RTP: PT=%02x: bad cseq %04x expected=%04x\n",
payload_type, seq, ((s->seq + 1) & 0xffff));
s->seq = seq;
if(pkt&&(pkt->data!=0))
{
//printf("free_packet\n");fflush(stdout);
av_free_packet(pkt);
}
switch_order=0;
s->first_rtcp=0;
return -1;
}
s->seq = seq;
#else
s->seq = seq;
#endif
len -= 12;
buf += 12;
st = s1->streams[idx];
switch(st->codec.codec_id) {
case CODEC_ID_MP2:
/* better than nothing: skip mpeg audio RTP header */
if (len <= 4)
return -1;
h = decode_be32(buf);
len -= 4;
buf += 4;
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
case CODEC_ID_MPEG1VIDEO:
/* better than nothing: skip mpeg audio RTP header */
if (len <= 4)
return -1;
h = decode_be32(buf);
buf += 4;
len -= 4;
if (h & (1 << 26)) {
/* mpeg2 */
if (len <= 4)
return -1;
buf += 4;
len -= 4;
}
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
case CODEC_ID_MPEG4:
case CODEC_ID_MJPEG:
case CODEC_ID_H264:
if(pkt&&(pkt->data!=0)&&(s->a_offset!=0))
av_free_packet(pkt);
if(pkt->data==0)
{
if(av_new_packet(pkt,s->profile.v_size)<0)
return -1;
pkt->stream_index=0;
}
if((s->v_offset+len)>s->profile.v_size)
{
//printf("Packet Alignment Fail! free it!\n");fflush(stdout);
av_free_packet(pkt);
return -1;
}
memcpy(pkt->data+s->v_offset, buf, len);
s->v_offset+=len;
break;
case CODEC_ID_ADPCM_IMA_WAV:
if(pkt&&(pkt->data!=0)&&(s->v_offset!=0))
av_free_packet(pkt);
if(pkt->data==0)
{
if(av_new_packet(pkt,s->profile.a_size)<0)
return -1;
pkt->stream_index=1;
}
if((s->a_offset+len)>s->profile.a_size)
{
//printf("Packet Alignment Fail! free it!\n");fflush(stdout);
av_free_packet(pkt);
return -1;
}
memcpy(pkt->data+s->a_offset, buf, len);
s->a_offset+=len;
break;
default:
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
}
switch(st->codec.codec_id) {
case CODEC_ID_MP2:
case CODEC_ID_MPEG1VIDEO:
case CODEC_ID_ADPCM_IMA_WAV:
case CODEC_ID_MPEG4:
case CODEC_ID_MJPEG:
case CODEC_ID_H264:
if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE) {
int64_t addend;
/* XXX: is it really necessary to unify the timestamp base ? */
/* compute pts from timestamp with received ntp_time */
delta_timestamp = timestamp - s->last_rtcp_timestamp;
/* convert to 90 kHz without overflow */
addend = (s->last_rtcp_ntp_time - s->first_rtcp_ntp_time) >> 14;
addend = (addend * 5625) >> 14;
pkt->pts = addend + delta_timestamp;
}
break;
default:
/* no timestamp info yet */
break;
}
