I have change the prefix to ff_,please review again!
Thks!

>> On Nov 14, 2022, at 15:46, tanwei (D) <tanwei123@hisilicon.com> wrote:
>> 
>> Fixes ticket #9949.
>> 
>> Signed-off-by: tanwei123 <tanwei123@hisilicon.com>
>> ---
>> libavformat/mpegts.c        | 20 ++++++++++++++++++++
>> libavformat/mpegts.h        |  1 +
>> libavformat/rtpdec.c        |  7 +++++++
>> libavformat/rtpdec.h        |  2 ++
>> libavformat/rtpdec_mpegts.c | 11 +++++++++++
>> libavformat/rtspdec.c       | 11 +++++++++++
>> 6 files changed, 52 insertions(+)
>> 
>> diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c index 
>> d97702fcd7..c5472bb464 100644
>> --- a/libavformat/mpegts.c
>> +++ b/libavformat/mpegts.c
>> @@ -3419,6 +3419,26 @@ int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
>>     return len1 - len;
>> }
>> 
>> +void avpriv_mpegts_seek_flush(MpegTSContext *ts)
>
>avpriv_ is meant to be exported symbols which can be called from other libs. ff_ prefix should be fine.
>
>> +{
>> +    int i;
>> +    /* flush pes buffer */
>> +    for (i = 0; i < NB_PID_MAX; i++) {
>> +        if (ts->pids[i]) {
>> +            if (ts->pids[i]->type == MPEGTS_PES) {
>> +                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
>> +                av_buffer_unref(&pes->buffer);
>> +                pes->data_index = 0;
>> +                pes->state = MPEGTS_SKIP; /* skip until pes header */
>> +            } else if (ts->pids[i]->type == MPEGTS_SECTION) {
>> +                ts->pids[i]->u.section_filter.last_ver = -1;
>> +            }
>> +            ts->pids[i]->last_cc = -1;
>> +            ts->pids[i]->last_pcr = -1;
>> +        }
>> +    }
>> +}
>> +
>> void avpriv_mpegts_parse_close(MpegTSContext *ts) {
>>     mpegts_free(ts);
>> diff --git a/libavformat/mpegts.h b/libavformat/mpegts.h index 
>> a48f14e768..b6f19e96bb 100644
>> --- a/libavformat/mpegts.h
>> +++ b/libavformat/mpegts.h
>> @@ -170,6 +170,7 @@ MpegTSContext 
>> *avpriv_mpegts_parse_open(AVFormatContext *s); int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
>>                                const uint8_t *buf, int len); void 
>> avpriv_mpegts_parse_close(MpegTSContext *ts);
>> +void avpriv_mpegts_seek_flush(MpegTSContext *ts);
>> 
>> typedef struct SLConfigDescr {
>>     int use_au_start;
>> diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c index 
>> fa7544cc07..d688afd1c1 100644
>> --- a/libavformat/rtpdec.c
>> +++ b/libavformat/rtpdec.c
>> @@ -954,6 +954,13 @@ int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
>>     return rv ? rv : has_next_packet(s); }
>> 
>> +void ff_rtp_seek_flush(RTPDemuxContext *s) {
>> +    ff_rtp_reset_packet_queue(s);
>> +    if (s->handler && s->handler->seek_flush)
>> +        s->handler->seek_flush(s->dynamic_protocol_context);
>> +}
>> +
>> void ff_rtp_parse_close(RTPDemuxContext *s) {
>>     ff_rtp_reset_packet_queue(s);
>> diff --git a/libavformat/rtpdec.h b/libavformat/rtpdec.h index 
>> 5a02e72dc2..8d6d857e28 100644
>> --- a/libavformat/rtpdec.h
>> +++ b/libavformat/rtpdec.h
>> @@ -52,6 +52,7 @@ int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket 
>> *pkt, void ff_rtp_parse_close(RTPDemuxContext *s); int64_t 
>> ff_rtp_queued_packet_time(RTPDemuxContext *s); void 
>> ff_rtp_reset_packet_queue(RTPDemuxContext *s);
>> +void ff_rtp_seek_flush(RTPDemuxContext *s);
>> 
>> /**
>>  * Send a dummy packet on both port pairs to set up the connection @@ 
>> -135,6 +136,7 @@ struct RTPDynamicProtocolHandler {
>>     /** Parse handler for this dynamic packet */
>>     DynamicPayloadPacketHandlerProc parse_packet;
>>     int (*need_keyframe)(PayloadContext *context);
>> +    void (*seek_flush)(PayloadContext *protocol_data);
>> };
>> 
>> typedef struct RTPPacket {
>> diff --git a/libavformat/rtpdec_mpegts.c b/libavformat/rtpdec_mpegts.c 
>> index 405271f744..6e9abcae08 100644
>> --- a/libavformat/rtpdec_mpegts.c
>> +++ b/libavformat/rtpdec_mpegts.c
>> @@ -47,6 +47,16 @@ static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
>>     return 0;
>> }
>> 
>> +static void mpegts_seek_flush(PayloadContext *data) {
>> +    if (!data)
>> +        return;
>> +    memset(data->buf, 0, data->read_buf_size);
>> +    data->read_buf_size = 0;
>> +    if (data->ts)
>> +        avpriv_mpegts_seek_flush(data->ts);
>> +}
>> +
>> static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data,
>>                                 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
>>                                 const uint8_t *buf, int len, uint16_t 
>> seq, @@ -94,6 +104,7 @@ const RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
>>     .priv_data_size    = sizeof(PayloadContext),
>>     .parse_packet      = mpegts_handle_packet,
>>     .init              = mpegts_init,
>> +    .seek_flush        = mpegts_seek_flush,
>>     .close             = mpegts_close_context,
>>     .static_payload_id = 33,
>> };
>> diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c index 
>> bbabec7db8..f743fac2ee 100644
>> --- a/libavformat/rtspdec.c
>> +++ b/libavformat/rtspdec.c
>> @@ -36,6 +36,7 @@
>> #include "rdt.h"
>> #include "tls.h"
>> #include "url.h"
>> +#include "mpegts.h"
>> #include "version.h"
>> 
>> static const struct RTSPStatusMessage { @@ -982,6 +983,16 @@ static 
>> int rtsp_read_seek(AVFormatContext *s, int stream_index,
>>         rt->state = RTSP_STATE_IDLE;
>>         break;
>>     }
>> +
>> +    if (rt->cur_transport_priv && rt->transport == RTSP_TRANSPORT_RTP) {
>> +        ff_rtp_seek_flush(rt->cur_transport_priv);
>> +    } else if (CONFIG_RTPDEC && rt->ts) {
>> +        av_freep(&rt->recvbuf);
>> +        rt->recvbuf_pos = 0;
>> +        rt->recvbuf_len = 0;
>> +        avpriv_mpegts_seek_flush(rt->ts);
>> +    }
>> +
>>     return 0;
>> }
>> 
>> --
>> 2.17.1
>> 
>> 
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