blob: 5bf0f186dbd0776f0fce93203fe45c6a47e5ee34
1 | /* |
2 | * RTP MPEG2TS depacketizer |
3 | * Copyright (c) 2003 Fabrice Bellard |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
7 | * FFmpeg is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2.1 of the License, or (at your option) any later version. |
11 | * |
12 | * FFmpeg is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Lesser General Public |
18 | * License along with FFmpeg; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
21 | |
22 | #include "libavutil/attributes.h" |
23 | #include "mpegts.h" |
24 | #include "rtpdec_formats.h" |
25 | |
26 | struct PayloadContext { |
27 | struct MpegTSContext *ts; |
28 | int read_buf_index; |
29 | int read_buf_size; |
30 | uint8_t buf[RTP_MAX_PACKET_LENGTH]; |
31 | }; |
32 | |
33 | static void mpegts_close_context(PayloadContext *data) |
34 | { |
35 | if (!data) |
36 | return; |
37 | if (data->ts) |
38 | avpriv_mpegts_parse_close(data->ts); |
39 | } |
40 | |
41 | static av_cold int mpegts_init(AVFormatContext *ctx, int st_index, |
42 | PayloadContext *data) |
43 | { |
44 | data->ts = avpriv_mpegts_parse_open(ctx); |
45 | if (!data->ts) |
46 | return AVERROR(ENOMEM); |
47 | return 0; |
48 | } |
49 | |
50 | static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data, |
51 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
52 | const uint8_t *buf, int len, uint16_t seq, |
53 | int flags) |
54 | { |
55 | int ret; |
56 | |
57 | // We don't want to use the RTP timestamps at all. If the mpegts demuxer |
58 | // doesn't set any pts/dts, the generic rtpdec code shouldn't try to |
59 | // fill it in either, since the mpegts and RTP timestamps are in totally |
60 | // different ranges. |
61 | *timestamp = RTP_NOTS_VALUE; |
62 | |
63 | if (!buf) { |
64 | if (data->read_buf_index >= data->read_buf_size) |
65 | return AVERROR(EAGAIN); |
66 | ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index, |
67 | data->read_buf_size - data->read_buf_index); |
68 | if (ret < 0) |
69 | return AVERROR(EAGAIN); |
70 | data->read_buf_index += ret; |
71 | if (data->read_buf_index < data->read_buf_size) |
72 | return 1; |
73 | else |
74 | return 0; |
75 | } |
76 | |
77 | ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len); |
78 | /* The only error that can be returned from avpriv_mpegts_parse_packet |
79 | * is "no more data to return from the provided buffer", so return |
80 | * AVERROR(EAGAIN) for all errors */ |
81 | if (ret < 0) |
82 | return AVERROR(EAGAIN); |
83 | if (ret < len) { |
84 | data->read_buf_size = FFMIN(len - ret, sizeof(data->buf)); |
85 | memcpy(data->buf, buf + ret, data->read_buf_size); |
86 | data->read_buf_index = 0; |
87 | return 1; |
88 | } |
89 | return 0; |
90 | } |
91 | |
92 | RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = { |
93 | .codec_type = AVMEDIA_TYPE_DATA, |
94 | .priv_data_size = sizeof(PayloadContext), |
95 | .parse_packet = mpegts_handle_packet, |
96 | .init = mpegts_init, |
97 | .close = mpegts_close_context, |
98 | .static_payload_id = 33, |
99 | }; |
100 |