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rtmpproto: Add getStreamLength call to query duration

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In (non-live) streams with no metadata, the duration of a stream can
be retrieved by calling the RTMP function getStreamLength with the
playpath. The server will return a positive duration upon the request if
the duration is known, otherwise either no response or a duration of 0
will be returned.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Uwe L. Korn 2014-10-14 17:16:21 +02:00 committed by Martin Storsjö
parent 324b23dde1
commit e65c776d18
1 changed files with 106 additions and 0 deletions
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106
libavformat/rtmpproto.c
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@ -123,6 +123,7 @@ typedef struct RTMPContext {
int listen; ///< listen mode flag
int listen_timeout; ///< listen timeout to wait for new connections
int nb_streamid; ///< The next stream id to return on createStream calls
double duration; ///< Duration of the stream in seconds as returned by the server (only valid if non-zero)
char username[50];
char password[50];
char auth_params[500];
@ -678,6 +679,30 @@ static int gen_delete_stream(URLContext *s, RTMPContext *rt)
return rtmp_send_packet(rt, &pkt, 0);
}
/**
* Generate 'getStreamLength' call and send it to the server. If the server
* knows the duration of the selected stream, it will reply with the duration
* in seconds.
*/
static int gen_get_stream_length(URLContext *s, RTMPContext *rt)
{
RTMPPacket pkt;
uint8_t *p;
int ret;
if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE,
0, 31 + strlen(rt->playpath))) < 0)
return ret;
p = pkt.data;
ff_amf_write_string(&p, "getStreamLength");
ff_amf_write_number(&p, ++rt->nb_invokes);
ff_amf_write_null(&p);
ff_amf_write_string(&p, rt->playpath);
return rtmp_send_packet(rt, &pkt, 1);
}
/**
* Generate client buffer time and send it to the server.
*/
@ -2044,11 +2069,19 @@ static int handle_invoke_result(URLContext *s, RTMPPacket *pkt)
if ((ret = gen_publish(s, rt)) < 0)
goto fail;
} else {
if (rt->live != -1) {
if ((ret = gen_get_stream_length(s, rt)) < 0)
goto fail;
}
if ((ret = gen_play(s, rt)) < 0)
goto fail;
if ((ret = gen_buffer_time(s, rt)) < 0)
goto fail;
}
} else if (!strcmp(tracked_method, "getStreamLength")) {
if (read_number_result(pkt, &rt->duration)) {
av_log(s, AV_LOG_WARNING, "Unexpected reply on getStreamLength()\n");
}
}
fail:
@ -2449,6 +2482,70 @@ static int rtmp_close(URLContext *h)
return ret;
}
/**
* Insert a fake onMetadata packet into the FLV stream to notify the FLV
* demuxer about the duration of the stream.
*
* This should only be done if there was no real onMetadata packet sent by the
* server at the start of the stream and if we were able to retrieve a valid
* duration via a getStreamLength call.
*
* @return 0 for successful operation, negative value in case of error
*/
static int inject_fake_duration_metadata(RTMPContext *rt)
{
// We need to insert the metdata packet directly after the FLV
// header, i.e. we need to move all other already read data by the
// size of our fake metadata packet.
uint8_t* p;
// Keep old flv_data pointer
uint8_t* old_flv_data = rt->flv_data;
// Allocate a new flv_data pointer with enough space for the additional package
if (!(rt->flv_data = av_malloc(rt->flv_size + 55))) {
rt->flv_data = old_flv_data;
return AVERROR(ENOMEM);
}
// Copy FLV header
memcpy(rt->flv_data, old_flv_data, 13);
// Copy remaining packets
memcpy(rt->flv_data + 13 + 55, old_flv_data + 13, rt->flv_size - 13);
// Increase the size by the injected packet
rt->flv_size += 55;
// Delete the old FLV data
av_free(old_flv_data);
p = rt->flv_data + 13;
bytestream_put_byte(&p, FLV_TAG_TYPE_META);
bytestream_put_be24(&p, 40); // size of data part (sum of all parts below)
bytestream_put_be24(&p, 0); // timestamp
bytestream_put_be32(&p, 0); // reserved
// first event name as a string
bytestream_put_byte(&p, AMF_DATA_TYPE_STRING);
// "onMetaData" as AMF string
bytestream_put_be16(&p, 10);
bytestream_put_buffer(&p, "onMetaData", 10);
// mixed array (hash) with size and string/type/data tuples
bytestream_put_byte(&p, AMF_DATA_TYPE_MIXEDARRAY);
bytestream_put_be32(&p, 1); // metadata_count
// "duration" as AMF string
bytestream_put_be16(&p, 8);
bytestream_put_buffer(&p, "duration", 8);
bytestream_put_byte(&p, AMF_DATA_TYPE_NUMBER);
bytestream_put_be64(&p, av_double2int(rt->duration));
// Finalise object
bytestream_put_be16(&p, 0); // Empty string
bytestream_put_byte(&p, AMF_END_OF_OBJECT);
bytestream_put_be32(&p, 40); // size of data part (sum of all parts below)
return 0;
}
/**
* Open RTMP connection and verify that the stream can be played.
*
@ -2656,6 +2753,7 @@ reconnect:
rt->received_metadata = 0;
rt->last_bytes_read = 0;
rt->server_bw = 2500000;
rt->duration = 0;
av_log(s, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
proto, path, rt->app, rt->playpath);
@ -2714,6 +2812,14 @@ reconnect:
if (rt->has_video) {
rt->flv_data[4] |= FLV_HEADER_FLAG_HASVIDEO;
}
// If we received the first packet of an A/V stream and no metadata but
// the server returned a valid duration, create a fake metadata packet
// to inform the FLV decoder about the duration.
if (!rt->received_metadata && rt->duration > 0) {
if ((ret = inject_fake_duration_metadata(rt)) < 0)
goto fail;
}
} else {
rt->flv_size = 0;
rt->flv_data = NULL;