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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * GXF demuxer. |
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| 3 | * Copyright (c) 2006 Reimar Doeffinger |
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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/channel_layout.h" |
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| 23 | #include "libavutil/common.h" |
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| 24 | #include "avformat.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "gxf.h" |
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| 27 | #include "libavcodec/mpeg12data.h" |
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| 28 | |||
| 29 | struct gxf_stream_info { |
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| 30 | int64_t first_field; |
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| 31 | int64_t last_field; |
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| 32 | AVRational frames_per_second; |
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| 33 | int32_t fields_per_frame; |
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| 34 | int64_t track_aux_data; |
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| 35 | }; |
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| 36 | |||
| 37 | /** |
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| 38 | * @brief parse gxf timecode and add it to metadata |
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| 39 | */ |
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| 40 | static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame) |
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| 41 | { |
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| 42 | char tmp[128]; |
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| 43 | int field = timecode & 0xff; |
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| 44 | int frame = fields_per_frame ? field / fields_per_frame : field; |
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| 45 | int second = (timecode >> 8) & 0xff; |
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| 46 | int minute = (timecode >> 16) & 0xff; |
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| 47 | int hour = (timecode >> 24) & 0x1f; |
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| 48 | int drop = (timecode >> 29) & 1; |
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| 49 | // bit 30: color_frame, unused |
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| 50 | // ignore invalid time code |
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| 51 | if (timecode >> 31) |
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| 52 | return 0; |
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| 53 | snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d", |
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| 54 | hour, minute, second, drop ? ';' : ':', frame); |
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| 55 | return av_dict_set(pm, key, tmp, 0); |
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| 56 | } |
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| 57 | |||
| 58 | /** |
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| 59 | * @brief parses a packet header, extracting type and length |
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| 60 | * @param pb AVIOContext to read header from |
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| 61 | * @param type detected packet type is stored here |
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| 62 | * @param length detected packet length, excluding header is stored here |
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| 63 | * @return 0 if header not found or contains invalid data, 1 otherwise |
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| 64 | */ |
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| 65 | static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) { |
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| 66 | if (avio_rb32(pb)) |
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| 67 | return 0; |
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| 68 | if (avio_r8(pb) != 1) |
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| 69 | return 0; |
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| 70 | *type = avio_r8(pb); |
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| 71 | *length = avio_rb32(pb); |
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| 72 | if ((*length >> 24) || *length < 16) |
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| 73 | return 0; |
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| 74 | *length -= 16; |
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| 75 | if (avio_rb32(pb)) |
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| 76 | return 0; |
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| 77 | if (avio_r8(pb) != 0xe1) |
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| 78 | return 0; |
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| 79 | if (avio_r8(pb) != 0xe2) |
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| 80 | return 0; |
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| 81 | return 1; |
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| 82 | } |
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| 83 | |||
| 84 | /** |
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| 85 | * @brief check if file starts with a PKT_MAP header |
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| 86 | */ |
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| 87 | static int gxf_probe(AVProbeData *p) { |
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| 88 | static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet |
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| 89 | static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2}; |
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| 90 | if (!memcmp(p->buf, startcode, sizeof(startcode)) && |
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| 91 | !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode))) |
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| 92 | return AVPROBE_SCORE_MAX; |
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| 93 | return 0; |
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| 94 | } |
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| 95 | |||
| 96 | /** |
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| 97 | * @brief gets the stream index for the track with the specified id, creates new |
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| 98 | * stream if not found |
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| 99 | * @param id id of stream to find / add |
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| 100 | * @param format stream format identifier |
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| 101 | */ |
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| 102 | static int get_sindex(AVFormatContext *s, int id, int format) { |
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| 103 | int i; |
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| 104 | AVStream *st = NULL; |
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| 105 | i = ff_find_stream_index(s, id); |
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| 106 | if (i >= 0) |
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| 107 | return i; |
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| 108 | st = avformat_new_stream(s, NULL); |
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| 109 | if (!st) |
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| 110 | return AVERROR(ENOMEM); |
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| 111 | st->id = id; |
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| 112 | switch (format) { |
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| 113 | case 3: |
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| 114 | case 4: |
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| 115 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 116 | st->codec->codec_id = AV_CODEC_ID_MJPEG; |
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| 117 | break; |
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| 118 | case 13: |
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| 119 | case 14: |
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| 120 | case 15: |
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| 121 | case 16: |
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| 122 | case 25: |
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| 123 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 124 | st->codec->codec_id = AV_CODEC_ID_DVVIDEO; |
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| 125 | break; |
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| 126 | case 11: |
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| 127 | case 12: |
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| 128 | case 20: |
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| 129 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 130 | st->codec->codec_id = AV_CODEC_ID_MPEG2VIDEO; |
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| 131 | st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. |
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| 132 | break; |
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| 133 | case 22: |
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| 134 | case 23: |
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| 135 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 136 | st->codec->codec_id = AV_CODEC_ID_MPEG1VIDEO; |
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| 137 | st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. |
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| 138 | break; |
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| 139 | case 9: |
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| 140 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 141 | st->codec->codec_id = AV_CODEC_ID_PCM_S24LE; |
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| 142 | st->codec->channels = 1; |
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| 143 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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| 144 | st->codec->sample_rate = 48000; |
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| 145 | st->codec->bit_rate = 3 * 1 * 48000 * 8; |
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| 146 | st->codec->block_align = 3 * 1; |
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| 147 | st->codec->bits_per_coded_sample = 24; |
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| 148 | break; |
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| 149 | case 10: |
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| 150 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 151 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
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| 152 | st->codec->channels = 1; |
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| 153 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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| 154 | st->codec->sample_rate = 48000; |
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| 155 | st->codec->bit_rate = 2 * 1 * 48000 * 8; |
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| 156 | st->codec->block_align = 2 * 1; |
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| 157 | st->codec->bits_per_coded_sample = 16; |
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| 158 | break; |
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| 159 | case 17: |
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| 160 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 161 | st->codec->codec_id = AV_CODEC_ID_AC3; |
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| 162 | st->codec->channels = 2; |
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| 163 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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| 164 | st->codec->sample_rate = 48000; |
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| 165 | break; |
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| 166 | case 26: /* AVCi50 / AVCi100 (AVC Intra) */ |
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| 167 | case 29: /* AVCHD */ |
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| 168 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 169 | st->codec->codec_id = CODEC_ID_H264; |
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| 170 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
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| 171 | break; |
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| 172 | // timecode tracks: |
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| 173 | case 7: |
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| 174 | case 8: |
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| 175 | case 24: |
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| 176 | st->codec->codec_type = AVMEDIA_TYPE_DATA; |
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| 177 | st->codec->codec_id = AV_CODEC_ID_NONE; |
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| 178 | break; |
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| 179 | case 30: |
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| 180 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 181 | st->codec->codec_id = AV_CODEC_ID_DNXHD; |
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| 182 | break; |
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| 183 | default: |
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| 184 | st->codec->codec_type = AVMEDIA_TYPE_UNKNOWN; |
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| 185 | st->codec->codec_id = AV_CODEC_ID_NONE; |
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| 186 | break; |
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| 187 | } |
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| 188 | return s->nb_streams - 1; |
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| 189 | } |
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| 190 | |||
| 191 | /** |
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| 192 | * @brief filters out interesting tags from material information. |
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| 193 | * @param len length of tag section, will be adjusted to contain remaining bytes |
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| 194 | * @param si struct to store collected information into |
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| 195 | */ |
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| 196 | static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { |
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| 197 | si->first_field = AV_NOPTS_VALUE; |
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| 198 | si->last_field = AV_NOPTS_VALUE; |
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| 199 | while (*len >= 2) { |
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| 200 | GXFMatTag tag = avio_r8(pb); |
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| 201 | int tlen = avio_r8(pb); |
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| 202 | *len -= 2; |
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| 203 | if (tlen > *len) |
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| 204 | return; |
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| 205 | *len -= tlen; |
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| 206 | if (tlen == 4) { |
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| 207 | uint32_t value = avio_rb32(pb); |
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| 208 | if (tag == MAT_FIRST_FIELD) |
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| 209 | si->first_field = value; |
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| 210 | else if (tag == MAT_LAST_FIELD) |
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| 211 | si->last_field = value; |
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| 212 | } else |
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| 213 | avio_skip(pb, tlen); |
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| 214 | } |
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| 215 | } |
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| 216 | |||
| 217 | static const AVRational frame_rate_tab[] = { |
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| 218 | { 60, 1}, |
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| 219 | {60000, 1001}, |
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| 220 | { 50, 1}, |
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| 221 | { 30, 1}, |
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| 222 | {30000, 1001}, |
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| 223 | { 25, 1}, |
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| 224 | { 24, 1}, |
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| 225 | {24000, 1001}, |
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| 226 | { 0, 0}, |
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| 227 | }; |
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| 228 | |||
| 229 | /** |
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| 230 | * @brief convert fps tag value to AVRational fps |
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| 231 | * @param fps fps value from tag |
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| 232 | * @return fps as AVRational, or 0 / 0 if unknown |
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| 233 | */ |
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| 234 | static AVRational fps_tag2avr(int32_t fps) { |
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| 235 | if (fps < 1 || fps > 9) fps = 9; |
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| 236 | return frame_rate_tab[fps - 1]; |
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| 237 | } |
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| 238 | |||
| 239 | /** |
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| 240 | * @brief convert UMF attributes flags to AVRational fps |
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| 241 | * @param flags UMF flags to convert |
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| 242 | * @return fps as AVRational, or 0 / 0 if unknown |
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| 243 | */ |
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| 244 | static AVRational fps_umf2avr(uint32_t flags) { |
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| 245 | static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1}, |
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| 246 | {25, 1}, {30000, 1001}}; |
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| 247 | int idx = av_log2((flags & 0x7c0) >> 6); |
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| 248 | return map[idx]; |
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| 249 | } |
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| 250 | |||
| 251 | /** |
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| 252 | * @brief filters out interesting tags from track information. |
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| 253 | * @param len length of tag section, will be adjusted to contain remaining bytes |
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| 254 | * @param si struct to store collected information into |
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| 255 | */ |
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| 256 | static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { |
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| 257 | si->frames_per_second = (AVRational){0, 0}; |
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| 258 | si->fields_per_frame = 0; |
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| 259 | si->track_aux_data = 0x80000000; |
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| 260 | while (*len >= 2) { |
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| 261 | GXFTrackTag tag = avio_r8(pb); |
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| 262 | int tlen = avio_r8(pb); |
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| 263 | *len -= 2; |
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| 264 | if (tlen > *len) |
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| 265 | return; |
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| 266 | *len -= tlen; |
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| 267 | if (tlen == 4) { |
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| 268 | uint32_t value = avio_rb32(pb); |
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| 269 | if (tag == TRACK_FPS) |
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| 270 | si->frames_per_second = fps_tag2avr(value); |
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| 271 | else if (tag == TRACK_FPF && (value == 1 || value == 2)) |
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| 272 | si->fields_per_frame = value; |
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| 273 | } else if (tlen == 8 && tag == TRACK_AUX) |
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| 274 | si->track_aux_data = avio_rl64(pb); |
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| 275 | else |
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| 276 | avio_skip(pb, tlen); |
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| 277 | } |
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| 278 | } |
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| 279 | |||
| 280 | /** |
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| 281 | * @brief read index from FLT packet into stream 0 av_index |
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| 282 | */ |
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| 283 | static void gxf_read_index(AVFormatContext *s, int pkt_len) { |
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| 284 | AVIOContext *pb = s->pb; |
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| 285 | AVStream *st; |
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| 286 | uint32_t fields_per_map = avio_rl32(pb); |
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| 287 | uint32_t map_cnt = avio_rl32(pb); |
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| 288 | int i; |
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| 289 | pkt_len -= 8; |
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| 290 | if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) { |
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| 291 | avio_skip(pb, pkt_len); |
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| 292 | return; |
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| 293 | } |
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| 294 | st = s->streams[0]; |
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| 295 | if (map_cnt > 1000) { |
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| 296 | av_log(s, AV_LOG_ERROR, "too many index entries %u (%x)\n", map_cnt, map_cnt); |
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| 297 | map_cnt = 1000; |
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| 298 | } |
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| 299 | if (pkt_len < 4 * map_cnt) { |
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| 300 | av_log(s, AV_LOG_ERROR, "invalid index length\n"); |
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| 301 | avio_skip(pb, pkt_len); |
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| 302 | return; |
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| 303 | } |
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| 304 | pkt_len -= 4 * map_cnt; |
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| 305 | av_add_index_entry(st, 0, 0, 0, 0, 0); |
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| 306 | for (i = 0; i < map_cnt; i++) |
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| 307 | av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024, |
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| 308 | i * (uint64_t)fields_per_map + 1, 0, 0, 0); |
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| 309 | avio_skip(pb, pkt_len); |
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| 310 | } |
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| 311 | |||
| 312 | static int gxf_header(AVFormatContext *s) { |
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| 313 | AVIOContext *pb = s->pb; |
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| 314 | GXFPktType pkt_type; |
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| 315 | int map_len; |
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| 316 | int len; |
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| 317 | AVRational main_timebase = {0, 0}; |
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| 318 | struct gxf_stream_info *si = s->priv_data; |
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| 319 | int i; |
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| 320 | if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) { |
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| 321 | av_log(s, AV_LOG_ERROR, "map packet not found\n"); |
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| 322 | return 0; |
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| 323 | } |
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| 324 | map_len -= 2; |
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| 325 | if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) { |
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| 326 | av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n"); |
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| 327 | return 0; |
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| 328 | } |
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| 329 | map_len -= 2; |
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| 330 | len = avio_rb16(pb); // length of material data section |
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| 331 | if (len > map_len) { |
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| 332 | av_log(s, AV_LOG_ERROR, "material data longer than map data\n"); |
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| 333 | return 0; |
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| 334 | } |
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| 335 | map_len -= len; |
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| 336 | gxf_material_tags(pb, &len, si); |
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| 337 | avio_skip(pb, len); |
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| 338 | map_len -= 2; |
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| 339 | len = avio_rb16(pb); // length of track description |
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| 340 | if (len > map_len) { |
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| 341 | av_log(s, AV_LOG_ERROR, "track description longer than map data\n"); |
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| 342 | return 0; |
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| 343 | } |
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| 344 | map_len -= len; |
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| 345 | while (len > 0) { |
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| 346 | int track_type, track_id, track_len; |
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| 347 | AVStream *st; |
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| 348 | int idx; |
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| 349 | len -= 4; |
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| 350 | track_type = avio_r8(pb); |
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| 351 | track_id = avio_r8(pb); |
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| 352 | track_len = avio_rb16(pb); |
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| 353 | len -= track_len; |
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| 354 | if (!(track_type & 0x80)) { |
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| 355 | av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type); |
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| 356 | continue; |
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| 357 | } |
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| 358 | track_type &= 0x7f; |
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| 359 | if ((track_id & 0xc0) != 0xc0) { |
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| 360 | av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id); |
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| 361 | continue; |
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| 362 | } |
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| 363 | track_id &= 0x3f; |
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| 364 | gxf_track_tags(pb, &track_len, si); |
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| 365 | // check for timecode tracks |
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| 366 | if (track_type == 7 || track_type == 8 || track_type == 24) { |
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| 367 | add_timecode_metadata(&s->metadata, "timecode", |
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| 368 | si->track_aux_data & 0xffffffff, |
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| 369 | si->fields_per_frame); |
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| 370 | |||
| 371 | } |
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| 372 | avio_skip(pb, track_len); |
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| 373 | |||
| 374 | idx = get_sindex(s, track_id, track_type); |
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| 375 | if (idx < 0) continue; |
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| 376 | st = s->streams[idx]; |
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| 377 | if (!main_timebase.num || !main_timebase.den) { |
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| 378 | main_timebase.num = si->frames_per_second.den; |
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| 379 | main_timebase.den = si->frames_per_second.num * 2; |
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| 380 | } |
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| 381 | st->start_time = si->first_field; |
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| 382 | if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE) |
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| 383 | st->duration = si->last_field - si->first_field; |
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| 384 | } |
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| 385 | if (len < 0) |
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| 386 | av_log(s, AV_LOG_ERROR, "invalid track description length specified\n"); |
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| 387 | if (map_len) |
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| 388 | avio_skip(pb, map_len); |
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| 389 | if (!parse_packet_header(pb, &pkt_type, &len)) { |
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| 390 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); |
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| 391 | return -1; |
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| 392 | } |
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| 393 | if (pkt_type == PKT_FLT) { |
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| 394 | gxf_read_index(s, len); |
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| 395 | if (!parse_packet_header(pb, &pkt_type, &len)) { |
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| 396 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); |
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| 397 | return -1; |
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| 398 | } |
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| 399 | } |
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| 400 | if (pkt_type == PKT_UMF) { |
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| 401 | if (len >= 0x39) { |
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| 402 | AVRational fps; |
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| 403 | len -= 0x39; |
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| 404 | avio_skip(pb, 5); // preamble |
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| 405 | avio_skip(pb, 0x30); // payload description |
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| 406 | fps = fps_umf2avr(avio_rl32(pb)); |
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| 407 | if (!main_timebase.num || !main_timebase.den) { |
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| 408 | av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag." |
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| 409 | " This might give wrong results.\n"); |
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| 410 | // this may not always be correct, but simply the best we can get |
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| 411 | main_timebase.num = fps.den; |
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| 412 | main_timebase.den = fps.num * 2; |
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| 413 | } |
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| 414 | |||
| 415 | if (len >= 0x18) { |
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| 416 | len -= 0x18; |
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| 417 | avio_skip(pb, 0x10); |
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| 418 | add_timecode_metadata(&s->metadata, "timecode_at_mark_in", |
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| 419 | avio_rl32(pb), si->fields_per_frame); |
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| 420 | add_timecode_metadata(&s->metadata, "timecode_at_mark_out", |
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| 421 | avio_rl32(pb), si->fields_per_frame); |
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| 422 | } |
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| 423 | } else |
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| 424 | av_log(s, AV_LOG_INFO, "UMF packet too short\n"); |
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| 425 | } else |
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| 426 | av_log(s, AV_LOG_INFO, "UMF packet missing\n"); |
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| 427 | avio_skip(pb, len); |
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| 428 | // set a fallback value, 60000/1001 is specified for audio-only files |
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| 429 | // so use that regardless of why we do not know the video frame rate. |
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| 430 | if (!main_timebase.num || !main_timebase.den) |
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| 431 | main_timebase = (AVRational){1001, 60000}; |
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| 432 | for (i = 0; i < s->nb_streams; i++) { |
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| 433 | AVStream *st = s->streams[i]; |
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| 434 | avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den); |
||
| 435 | } |
||
| 436 | return 0; |
||
| 437 | } |
||
| 438 | |||
| 439 | #define READ_ONE() \ |
||
| 440 | { \ |
||
| 441 | if (!max_interval-- || url_feof(pb)) \ |
||
| 442 | goto out; \ |
||
| 443 | tmp = tmp << 8 | avio_r8(pb); \ |
||
| 444 | } |
||
| 445 | |||
| 446 | /** |
||
| 447 | * @brief resync the stream on the next media packet with specified properties |
||
| 448 | * @param max_interval how many bytes to search for matching packet at most |
||
| 449 | * @param track track id the media packet must belong to, -1 for any |
||
| 450 | * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any |
||
| 451 | * @return timestamp of packet found |
||
| 452 | */ |
||
| 453 | static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) { |
||
| 454 | uint32_t tmp; |
||
| 455 | uint64_t last_pos; |
||
| 456 | uint64_t last_found_pos = 0; |
||
| 457 | int cur_track; |
||
| 458 | int64_t cur_timestamp = AV_NOPTS_VALUE; |
||
| 459 | int len; |
||
| 460 | AVIOContext *pb = s->pb; |
||
| 461 | GXFPktType type; |
||
| 462 | tmp = avio_rb32(pb); |
||
| 463 | start: |
||
| 464 | while (tmp) |
||
| 465 | READ_ONE(); |
||
| 466 | READ_ONE(); |
||
| 467 | if (tmp != 1) |
||
| 468 | goto start; |
||
| 469 | last_pos = avio_tell(pb); |
||
| 470 | if (avio_seek(pb, -5, SEEK_CUR) < 0) |
||
| 471 | goto out; |
||
| 472 | if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) { |
||
| 473 | if (avio_seek(pb, last_pos, SEEK_SET) < 0) |
||
| 474 | goto out; |
||
| 475 | goto start; |
||
| 476 | } |
||
| 477 | avio_r8(pb); |
||
| 478 | cur_track = avio_r8(pb); |
||
| 479 | cur_timestamp = avio_rb32(pb); |
||
| 480 | last_found_pos = avio_tell(pb) - 16 - 6; |
||
| 481 | if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) { |
||
| 482 | if (avio_seek(pb, last_pos, SEEK_SET) >= 0) |
||
| 483 | goto start; |
||
| 484 | } |
||
| 485 | out: |
||
| 486 | if (last_found_pos) |
||
| 487 | avio_seek(pb, last_found_pos, SEEK_SET); |
||
| 488 | return cur_timestamp; |
||
| 489 | } |
||
| 490 | |||
| 491 | static int gxf_packet(AVFormatContext *s, AVPacket *pkt) { |
||
| 492 | AVIOContext *pb = s->pb; |
||
| 493 | GXFPktType pkt_type; |
||
| 494 | int pkt_len; |
||
| 495 | struct gxf_stream_info *si = s->priv_data; |
||
| 496 | |||
| 497 | while (!pb->eof_reached) { |
||
| 498 | AVStream *st; |
||
| 499 | int track_type, track_id, ret; |
||
| 500 | int field_nr, field_info, skip = 0; |
||
| 501 | int stream_index; |
||
| 502 | if (!parse_packet_header(pb, &pkt_type, &pkt_len)) { |
||
| 503 | if (!url_feof(pb)) |
||
| 504 | av_log(s, AV_LOG_ERROR, "sync lost\n"); |
||
| 505 | return -1; |
||
| 506 | } |
||
| 507 | if (pkt_type == PKT_FLT) { |
||
| 508 | gxf_read_index(s, pkt_len); |
||
| 509 | continue; |
||
| 510 | } |
||
| 511 | if (pkt_type != PKT_MEDIA) { |
||
| 512 | avio_skip(pb, pkt_len); |
||
| 513 | continue; |
||
| 514 | } |
||
| 515 | if (pkt_len < 16) { |
||
| 516 | av_log(s, AV_LOG_ERROR, "invalid media packet length\n"); |
||
| 517 | continue; |
||
| 518 | } |
||
| 519 | pkt_len -= 16; |
||
| 520 | track_type = avio_r8(pb); |
||
| 521 | track_id = avio_r8(pb); |
||
| 522 | stream_index = get_sindex(s, track_id, track_type); |
||
| 523 | if (stream_index < 0) |
||
| 524 | return stream_index; |
||
| 525 | st = s->streams[stream_index]; |
||
| 526 | field_nr = avio_rb32(pb); |
||
| 527 | field_info = avio_rb32(pb); |
||
| 528 | avio_rb32(pb); // "timeline" field number |
||
| 529 | avio_r8(pb); // flags |
||
| 530 | avio_r8(pb); // reserved |
||
| 531 | if (st->codec->codec_id == AV_CODEC_ID_PCM_S24LE || |
||
| 532 | st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) { |
||
| 533 | int first = field_info >> 16; |
||
| 534 | int last = field_info & 0xffff; // last is exclusive |
||
| 535 | int bps = av_get_bits_per_sample(st->codec->codec_id)>>3; |
||
| 536 | if (first <= last && last*bps <= pkt_len) { |
||
| 537 | avio_skip(pb, first*bps); |
||
| 538 | skip = pkt_len - last*bps; |
||
| 539 | pkt_len = (last-first)*bps; |
||
| 540 | } else |
||
| 541 | av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n"); |
||
| 542 | } |
||
| 543 | ret = av_get_packet(pb, pkt, pkt_len); |
||
| 544 | if (skip) |
||
| 545 | avio_skip(pb, skip); |
||
| 546 | pkt->stream_index = stream_index; |
||
| 547 | pkt->dts = field_nr; |
||
| 548 | |||
| 549 | //set duration manually for DV or else lavf misdetects the frame rate |
||
| 550 | if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) |
||
| 551 | pkt->duration = si->fields_per_frame; |
||
| 552 | |||
| 553 | return ret; |
||
| 554 | } |
||
| 555 | return AVERROR_EOF; |
||
| 556 | } |
||
| 557 | |||
| 558 | static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { |
||
| 559 | int res = 0; |
||
| 560 | uint64_t pos; |
||
| 561 | uint64_t maxlen = 100 * 1024 * 1024; |
||
| 562 | AVStream *st = s->streams[0]; |
||
| 563 | int64_t start_time = s->streams[stream_index]->start_time; |
||
| 564 | int64_t found; |
||
| 565 | int idx; |
||
| 566 | if (timestamp < start_time) timestamp = start_time; |
||
| 567 | idx = av_index_search_timestamp(st, timestamp - start_time, |
||
| 568 | AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); |
||
| 569 | if (idx < 0) |
||
| 570 | return -1; |
||
| 571 | pos = st->index_entries[idx].pos; |
||
| 572 | if (idx < st->nb_index_entries - 2) |
||
| 573 | maxlen = st->index_entries[idx + 2].pos - pos; |
||
| 574 | maxlen = FFMAX(maxlen, 200 * 1024); |
||
| 575 | res = avio_seek(s->pb, pos, SEEK_SET); |
||
| 576 | if (res < 0) |
||
| 577 | return res; |
||
| 578 | found = gxf_resync_media(s, maxlen, -1, timestamp); |
||
| 579 | if (FFABS(found - timestamp) > 4) |
||
| 580 | return -1; |
||
| 581 | return 0; |
||
| 582 | } |
||
| 583 | |||
| 584 | static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, |
||
| 585 | int64_t *pos, int64_t pos_limit) { |
||
| 586 | AVIOContext *pb = s->pb; |
||
| 587 | int64_t res; |
||
| 588 | if (avio_seek(pb, *pos, SEEK_SET) < 0) |
||
| 589 | return AV_NOPTS_VALUE; |
||
| 590 | res = gxf_resync_media(s, pos_limit - *pos, -1, -1); |
||
| 591 | *pos = avio_tell(pb); |
||
| 592 | return res; |
||
| 593 | } |
||
| 594 | |||
| 595 | AVInputFormat ff_gxf_demuxer = { |
||
| 596 | .name = "gxf", |
||
| 597 | .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"), |
||
| 598 | .priv_data_size = sizeof(struct gxf_stream_info), |
||
| 599 | .read_probe = gxf_probe, |
||
| 600 | .read_header = gxf_header, |
||
| 601 | .read_packet = gxf_packet, |
||
| 602 | .read_seek = gxf_seek, |
||
| 603 | .read_timestamp = gxf_read_timestamp, |
||
| 604 | }; |