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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RTP MPEG2TS depacketizer |
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| 3 | * Copyright (c) 2003 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/attributes.h" |
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| 23 | #include "mpegts.h" |
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| 24 | #include "rtpdec_formats.h" |
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| 25 | |||
| 26 | struct PayloadContext { |
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| 27 | struct MpegTSContext *ts; |
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| 28 | int read_buf_index; |
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| 29 | int read_buf_size; |
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| 30 | uint8_t buf[RTP_MAX_PACKET_LENGTH]; |
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| 31 | }; |
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| 32 | |||
| 33 | static PayloadContext *mpegts_new_context(void) |
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| 34 | { |
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| 35 | return av_mallocz(sizeof(PayloadContext)); |
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| 36 | } |
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| 37 | |||
| 38 | static void mpegts_free_context(PayloadContext *data) |
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| 39 | { |
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| 40 | if (!data) |
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| 41 | return; |
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| 42 | if (data->ts) |
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| 43 | ff_mpegts_parse_close(data->ts); |
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| 44 | av_free(data); |
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| 45 | } |
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| 46 | |||
| 47 | static av_cold int mpegts_init(AVFormatContext *ctx, int st_index, |
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| 48 | PayloadContext *data) |
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| 49 | { |
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| 50 | data->ts = ff_mpegts_parse_open(ctx); |
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| 51 | if (!data->ts) |
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| 52 | return AVERROR(ENOMEM); |
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| 53 | return 0; |
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| 54 | } |
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| 55 | |||
| 56 | static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data, |
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| 57 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
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| 58 | const uint8_t *buf, int len, uint16_t seq, |
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| 59 | int flags) |
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| 60 | { |
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| 61 | int ret; |
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| 62 | |||
| 63 | // We don't want to use the RTP timestamps at all. If the mpegts demuxer |
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| 64 | // doesn't set any pts/dts, the generic rtpdec code shouldn't try to |
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| 65 | // fill it in either, since the mpegts and RTP timestamps are in totally |
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| 66 | // different ranges. |
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| 67 | *timestamp = RTP_NOTS_VALUE; |
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| 68 | |||
| 69 | if (!data->ts) |
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| 70 | return AVERROR(EINVAL); |
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| 71 | |||
| 72 | if (!buf) { |
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| 73 | if (data->read_buf_index >= data->read_buf_size) |
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| 74 | return AVERROR(EAGAIN); |
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| 75 | ret = ff_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index, |
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| 76 | data->read_buf_size - data->read_buf_index); |
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| 77 | if (ret < 0) |
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| 78 | return AVERROR(EAGAIN); |
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| 79 | data->read_buf_index += ret; |
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| 80 | if (data->read_buf_index < data->read_buf_size) |
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| 81 | return 1; |
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| 82 | else |
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| 83 | return 0; |
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| 84 | } |
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| 85 | |||
| 86 | ret = ff_mpegts_parse_packet(data->ts, pkt, buf, len); |
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| 87 | /* The only error that can be returned from ff_mpegts_parse_packet |
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| 88 | * is "no more data to return from the provided buffer", so return |
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| 89 | * AVERROR(EAGAIN) for all errors */ |
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| 90 | if (ret < 0) |
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| 91 | return AVERROR(EAGAIN); |
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| 92 | if (ret < len) { |
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| 93 | data->read_buf_size = FFMIN(len - ret, sizeof(data->buf)); |
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| 94 | memcpy(data->buf, buf + ret, data->read_buf_size); |
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| 95 | data->read_buf_index = 0; |
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| 96 | return 1; |
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| 97 | } |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 101 | RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = { |
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| 102 | .codec_type = AVMEDIA_TYPE_DATA, |
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| 103 | .parse_packet = mpegts_handle_packet, |
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| 104 | .alloc = mpegts_new_context, |
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| 105 | .init = mpegts_init, |
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| 106 | .free = mpegts_free_context, |
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| 107 | .static_payload_id = 33, |
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| 108 | }; |