PeerStreamer

#include <libavutil/intreadwrite.h>

static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)

{

    RTSPState *rt = s->priv_data;

    AVFormatContext *rtpctx = rtsp_st->transport_priv;

    uint8_t *buf, *ptr;

    int size;

    uint8_t interleave_header[4];

    size = url_close_dyn_buf(rtpctx->pb, &buf);

    ptr = buf;

    while (size > 4) {

        uint32_t packet_len = AV_RB32(ptr);

        int id;

        ptr += 4;

        size -= 4;

        if (packet_len > size || packet_len < 2)

            break;

        if (ptr[1] >= 200 && ptr[1] <= 204)

            id = rtsp_st->interleaved_max; /* RTCP */

        else

            id = rtsp_st->interleaved_min; /* RTP */

        interleave_header[0] = '$';

        interleave_header[1] = id;

        AV_WB16(interleave_header + 2, packet_len);

        url_write(rt->rtsp_hd, interleave_header, 4);

        url_write(rt->rtsp_hd, ptr, packet_len);

        ptr += packet_len;

        size -= packet_len;

    }

    av_free(buf);

    url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);

    return 0;

}

    ret = av_write_frame(rtpctx, &local_pkt);

    /* av_write_frame does all the RTP packetization. If using TCP as

     * transport, rtpctx->pb is only a dyn_packet_buf that queues up the

     * packets, so we need to send them out on the TCP connection separately.

     */

    if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)

        ret = tcp_write_packet(s, rtsp_st);

    return ret;