| /* |
| * RTP MPEG2TS depacketizer |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/attributes.h" |
| #include "mpegts.h" |
| #include "rtpdec_formats.h" |
| |
| struct PayloadContext { |
| struct MpegTSContext *ts; |
| int read_buf_index; |
| int read_buf_size; |
| uint8_t buf[RTP_MAX_PACKET_LENGTH]; |
| }; |
| |
| static void mpegts_close_context(PayloadContext *data) |
| { |
| if (!data) |
| return; |
| if (data->ts) |
| avpriv_mpegts_parse_close(data->ts); |
| } |
| |
| static av_cold int mpegts_init(AVFormatContext *ctx, int st_index, |
| PayloadContext *data) |
| { |
| data->ts = avpriv_mpegts_parse_open(ctx); |
| if (!data->ts) |
| return AVERROR(ENOMEM); |
| return 0; |
| } |
| |
| 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, |
| int flags) |
| { |
| int ret; |
| |
| // We don't want to use the RTP timestamps at all. If the mpegts demuxer |
| // doesn't set any pts/dts, the generic rtpdec code shouldn't try to |
| // fill it in either, since the mpegts and RTP timestamps are in totally |
| // different ranges. |
| *timestamp = RTP_NOTS_VALUE; |
| |
| if (!buf) { |
| if (data->read_buf_index >= data->read_buf_size) |
| return AVERROR(EAGAIN); |
| ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index, |
| data->read_buf_size - data->read_buf_index); |
| if (ret < 0) |
| return AVERROR(EAGAIN); |
| data->read_buf_index += ret; |
| if (data->read_buf_index < data->read_buf_size) |
| return 1; |
| else |
| return 0; |
| } |
| |
| ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len); |
| /* The only error that can be returned from avpriv_mpegts_parse_packet |
| * is "no more data to return from the provided buffer", so return |
| * AVERROR(EAGAIN) for all errors */ |
| if (ret < 0) |
| return AVERROR(EAGAIN); |
| if (ret < len) { |
| data->read_buf_size = FFMIN(len - ret, sizeof(data->buf)); |
| memcpy(data->buf, buf + ret, data->read_buf_size); |
| data->read_buf_index = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = { |
| .codec_type = AVMEDIA_TYPE_DATA, |
| .priv_data_size = sizeof(PayloadContext), |
| .parse_packet = mpegts_handle_packet, |
| .init = mpegts_init, |
| .close = mpegts_close_context, |
| .static_payload_id = 33, |
| }; |