| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * NC camera feed demuxer | ||
| 3 | * Copyright (c) 2009 Nicolas Martin (martinic at iro dot umontreal dot ca) | ||
| 4 | * Edouard Auvinet | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | #include "avformat.h" | ||
| 25 | #include "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | |||
| 28 | #define NC_VIDEO_FLAG 0x1A5 | ||
| 29 | |||
| 30 | 7186 | static int nc_probe(const AVProbeData *probe_packet) | |
| 31 | { | ||
| 32 | int size; | ||
| 33 | |||
| 34 |
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7186 | if (AV_RB32(probe_packet->buf) != NC_VIDEO_FLAG) |
| 35 | 7185 | return 0; | |
| 36 | |||
| 37 | 1 | size = AV_RL16(probe_packet->buf + 5); | |
| 38 | |||
| 39 |
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1 | if (size + 20 > probe_packet->buf_size) |
| 40 | ✗ | return AVPROBE_SCORE_MAX/4; | |
| 41 | |||
| 42 |
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1 | if (AV_RB32(probe_packet->buf+16+size) == NC_VIDEO_FLAG) |
| 43 | 1 | return AVPROBE_SCORE_MAX; | |
| 44 | |||
| 45 | ✗ | return 0; | |
| 46 | } | ||
| 47 | |||
| 48 | 1 | static int nc_read_header(AVFormatContext *s) | |
| 49 | { | ||
| 50 | 1 | AVStream *st = avformat_new_stream(s, NULL); | |
| 51 | |||
| 52 |
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1 | if (!st) |
| 53 | ✗ | return AVERROR(ENOMEM); | |
| 54 | |||
| 55 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 56 | 1 | st->codecpar->codec_id = AV_CODEC_ID_MPEG4; | |
| 57 | 1 | ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; | |
| 58 | |||
| 59 | 1 | avpriv_set_pts_info(st, 64, 1, 100); | |
| 60 | |||
| 61 | 1 | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | 1057 | static int nc_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 65 | { | ||
| 66 | int size; | ||
| 67 | int ret; | ||
| 68 | |||
| 69 | 1057 | uint32_t state=-1; | |
| 70 |
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5281 | while (state != NC_VIDEO_FLAG) { |
| 71 |
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4225 | if (avio_feof(s->pb)) |
| 72 | 1 | return AVERROR(EIO); | |
| 73 | 4224 | state = (state<<8) + avio_r8(s->pb); | |
| 74 | } | ||
| 75 | |||
| 76 | 1056 | avio_r8(s->pb); | |
| 77 | 1056 | size = avio_rl16(s->pb); | |
| 78 | 1056 | avio_skip(s->pb, 9); | |
| 79 | |||
| 80 |
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1056 | if (size == 0) { |
| 81 | ✗ | av_log(s, AV_LOG_DEBUG, "Next packet size is zero\n"); | |
| 82 | ✗ | return AVERROR(EAGAIN); | |
| 83 | } | ||
| 84 | |||
| 85 | 1056 | ret = av_get_packet(s->pb, pkt, size); | |
| 86 |
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1056 | if (ret != size) { |
| 87 | 1 | return AVERROR(EIO); | |
| 88 | } | ||
| 89 | |||
| 90 | 1055 | pkt->stream_index = 0; | |
| 91 | 1055 | return size; | |
| 92 | } | ||
| 93 | |||
| 94 | const FFInputFormat ff_nc_demuxer = { | ||
| 95 | .p.name = "nc", | ||
| 96 | .p.long_name = NULL_IF_CONFIG_SMALL("NC camera feed"), | ||
| 97 | .p.extensions = "v", | ||
| 98 | .read_probe = nc_probe, | ||
| 99 | .read_header = nc_read_header, | ||
| 100 | .read_packet = nc_read_packet, | ||
| 101 | }; | ||
| 102 |