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2ba45a60 DM |
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 PayloadContext *mpegts_new_context(void) | |
34 | { | |
35 | return av_mallocz(sizeof(PayloadContext)); | |
36 | } | |
37 | ||
38 | static void mpegts_free_context(PayloadContext *data) | |
39 | { | |
40 | if (!data) | |
41 | return; | |
42 | if (data->ts) | |
43 | avpriv_mpegts_parse_close(data->ts); | |
44 | av_free(data); | |
45 | } | |
46 | ||
47 | static av_cold int mpegts_init(AVFormatContext *ctx, int st_index, | |
48 | PayloadContext *data) | |
49 | { | |
50 | data->ts = avpriv_mpegts_parse_open(ctx); | |
51 | if (!data->ts) | |
52 | return AVERROR(ENOMEM); | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data, | |
57 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | |
58 | const uint8_t *buf, int len, uint16_t seq, | |
59 | int flags) | |
60 | { | |
61 | int ret; | |
62 | ||
63 | // We don't want to use the RTP timestamps at all. If the mpegts demuxer | |
64 | // doesn't set any pts/dts, the generic rtpdec code shouldn't try to | |
65 | // fill it in either, since the mpegts and RTP timestamps are in totally | |
66 | // different ranges. | |
67 | *timestamp = RTP_NOTS_VALUE; | |
68 | ||
69 | if (!data->ts) | |
70 | return AVERROR(EINVAL); | |
71 | ||
72 | if (!buf) { | |
73 | if (data->read_buf_index >= data->read_buf_size) | |
74 | return AVERROR(EAGAIN); | |
75 | ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index, | |
76 | data->read_buf_size - data->read_buf_index); | |
77 | if (ret < 0) | |
78 | return AVERROR(EAGAIN); | |
79 | data->read_buf_index += ret; | |
80 | if (data->read_buf_index < data->read_buf_size) | |
81 | return 1; | |
82 | else | |
83 | return 0; | |
84 | } | |
85 | ||
86 | ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len); | |
87 | /* The only error that can be returned from avpriv_mpegts_parse_packet | |
88 | * is "no more data to return from the provided buffer", so return | |
89 | * AVERROR(EAGAIN) for all errors */ | |
90 | if (ret < 0) | |
91 | return AVERROR(EAGAIN); | |
92 | if (ret < len) { | |
93 | data->read_buf_size = FFMIN(len - ret, sizeof(data->buf)); | |
94 | memcpy(data->buf, buf + ret, data->read_buf_size); | |
95 | data->read_buf_index = 0; | |
96 | return 1; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
101 | RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = { | |
102 | .codec_type = AVMEDIA_TYPE_DATA, | |
103 | .parse_packet = mpegts_handle_packet, | |
104 | .alloc = mpegts_new_context, | |
105 | .init = mpegts_init, | |
106 | .free = mpegts_free_context, | |
107 | .static_payload_id = 33, | |
108 | }; |