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Commit 49ffa190 authored by Ghislain MARY's avatar Ghislain MARY
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Play pcap file according to timestamp field of RTP header.

parent 9c3f1bdf
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Showing with 34 additions and 9 deletions
src/msfileplayer.c
View file @ 49ffa190
......@@ -49,7 +49,8 @@ struct _PlayerData{
struct pcap_pkthdr *pcap_hdr;
const u_char *pcap_data;
bool_t pcap_started;
uint64_t pcap_initial_ts;
uint64_t pcap_initial_time;
uint32_t pcap_initial_ts;
uint16_t pcap_seq;
#endif
};
......@@ -271,7 +272,7 @@ static void player_process(MSFilter *f){
bool_t cont = TRUE;
do {
if (d->pcap_data && d->pcap_hdr) {
/* The PCAP data has already been read at previous interation. */
/* The PCAP data has already been read at previous iteration. */
res = 1;
} else {
res = pcap_next_ex(d->pcap, &d->pcap_hdr, &d->pcap_data);
......@@ -279,22 +280,32 @@ static void player_process(MSFilter *f){
if (res == -2) {
ms_filter_notify_no_arg(f, MS_FILE_PLAYER_EOF);
} else if (res > 0) {
if (d->pcap_hdr->caplen > 54) {
int bytes = d->pcap_hdr->caplen - 54;
const u_char *ethernet_header = &d->pcap_data[0];
const u_char *ip_header = ethernet_header + 14; // sizeof(ethernet_header)
const u_char *udp_header = ip_header + 20; // sizeof(ipv4_header)
const u_char *rtp_header = udp_header + 8; // sizeof(udp_header)
const u_char *payload = rtp_header + 12; // sizeof(rtp_header)
int headers_size = payload - ethernet_header;
// Check headers size and RTP version
if ((d->pcap_hdr->caplen >= headers_size) && ((rtp_header[0] >> 6) == 2)) {
int bytes = d->pcap_hdr->caplen - headers_size;
mblk_t *om;
uint64_t ts = (uint64_t)(d->pcap_hdr->ts.tv_sec * 1000) + (uint64_t)(d->pcap_hdr->ts.tv_usec / 1000);
uint16_t pcap_seq = ntohs(*((uint16_t*)&d->pcap_data[44]));
uint16_t pcap_seq = ntohs(*((uint16_t*)(rtp_header + 2)));
uint32_t ts = ntohl(*((uint32_t*)(rtp_header + 4)));
uint32_t diff_ms;
if (d->pcap_started == FALSE) {
d->pcap_started = TRUE;
d->pcap_initial_ts = ts;
d->pcap_initial_time = f->ticker->time;
d->pcap_seq = pcap_seq;
}
if ((d->pcap_initial_ts + f->ticker->time) > ts) {
diff_ms = ((ts - d->pcap_initial_ts) * 1000) / d->rate;
if ((f->ticker->time - d->pcap_initial_time) >= diff_ms) {
if (pcap_seq >= d->pcap_seq) {
om = allocb(bytes, 0);
memcpy(om->b_wptr, &d->pcap_data[54], bytes);
memcpy(om->b_wptr, payload, bytes);
om->b_wptr += bytes;
mblk_set_timestamp_info(om, ts);
mblk_set_timestamp_info(om, f->ticker->time);
ms_queue_put(f->outputs[0], om);
}
d->pcap_seq = pcap_seq;
......@@ -303,6 +314,10 @@ static void player_process(MSFilter *f){
} else {
cont = FALSE;
}
} else {
// Ignore wrong RTP packet
d->pcap_hdr = NULL;
d->pcap_data = NULL;
}
}
} while ((res > 0) && cont);
......@@ -358,6 +373,13 @@ static int player_get_sr(MSFilter *f, void*arg){
return 0;
}
static int player_set_sr(MSFilter *f, void *arg) {
/* This function should be used only when playing a PCAP file */
PlayerData *d = (PlayerData *)f->data;
d->rate = *((int *)arg);
return 0;
}
static int player_loop(MSFilter *f, void *arg){
PlayerData *d=(PlayerData*)f->data;
d->loop_after=*((int*)arg);
......@@ -385,6 +407,7 @@ static MSFilterMethod player_methods[]={
{ MS_FILE_PLAYER_STOP, player_stop },
{ MS_FILE_PLAYER_CLOSE, player_close },
{ MS_FILTER_GET_SAMPLE_RATE, player_get_sr},
{ MS_FILTER_SET_SAMPLE_RATE, player_set_sr},
{ MS_FILTER_GET_NCHANNELS, player_get_nch },
{ MS_FILE_PLAYER_LOOP, player_loop },
{ MS_FILE_PLAYER_DONE, player_eof },
......
tests/pcap_playback.c
View file @ 49ffa190
......@@ -222,6 +222,7 @@ static void setup_media_streams(MediastreamDatas *args)
ms_filter_call_method_noarg(args->read, MS_FILE_PLAYER_CLOSE);
ms_filter_call_method(args->read, MS_FILE_PLAYER_OPEN, args->infile);
ms_filter_call_method_noarg(args->read, MS_FILE_PLAYER_START);
ms_filter_call_method(args->read, MS_FILTER_SET_SAMPLE_RATE, &args->pt->clock_rate);
ms_filter_set_notify_callback(args->read, reader_notify_cb, NULL);
/*force the decoder to output YUV420P */
......@@ -258,6 +259,7 @@ static void setup_media_streams(MediastreamDatas *args)
ms_filter_call_method_noarg(args->read, MS_FILE_PLAYER_CLOSE);
ms_filter_call_method(args->read, MS_FILE_PLAYER_OPEN, args->infile);
ms_filter_call_method_noarg(args->read, MS_FILE_PLAYER_START);
ms_filter_call_method(args->read, MS_FILTER_SET_SAMPLE_RATE, &args->pt->clock_rate);
ms_filter_call_method(args->decoder, MS_FILTER_SET_SAMPLE_RATE, &args->pt->clock_rate);
ms_filter_call_method(args->decoder, MS_FILTER_SET_NCHANNELS, &args->pt->channels);
ms_filter_call_method(args->write, MS_FILTER_SET_SAMPLE_RATE, &args->pt->clock_rate);
......
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