/* * GXF demuxer. * Copyright (c) 2006 Reimar Doeffinger * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <inttypes.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "avformat.h" #include "internal.h" #include "gxf.h" #include "libavcodec/mpeg12data.h" struct gxf_stream_info { int64_t first_field; int64_t last_field; AVRational frames_per_second; int32_t fields_per_frame; int64_t track_aux_data; }; /** * @brief parse gxf timecode and add it to metadata */ static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame) { char tmp[128]; int field = timecode & 0xff; int frame = fields_per_frame ? field / fields_per_frame : field; int second = (timecode >> 8) & 0xff; int minute = (timecode >> 16) & 0xff; int hour = (timecode >> 24) & 0x1f; int drop = (timecode >> 29) & 1; // bit 30: color_frame, unused // ignore invalid time code if (timecode >> 31) return 0; snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d", hour, minute, second, drop ? ';' : ':', frame); return av_dict_set(pm, key, tmp, 0); } /** * @brief parses a packet header, extracting type and length * @param pb AVIOContext to read header from * @param type detected packet type is stored here * @param length detected packet length, excluding header is stored here * @return 0 if header not found or contains invalid data, 1 otherwise */ static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) { if (avio_rb32(pb)) return 0; if (avio_r8(pb) != 1) return 0; *type = avio_r8(pb); *length = avio_rb32(pb); if ((*length >> 24) || *length < 16) return 0; *length -= 16; if (avio_rb32(pb)) return 0; if (avio_r8(pb) != 0xe1) return 0; if (avio_r8(pb) != 0xe2) return 0; return 1; } /** * @brief check if file starts with a PKT_MAP header */ static int gxf_probe(const AVProbeData *p) { static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2}; if (!memcmp(p->buf, startcode, sizeof(startcode)) && !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode))) return AVPROBE_SCORE_MAX; return 0; } /** * @brief gets the stream index for the track with the specified id, creates new * stream if not found * @param id id of stream to find / add * @param format stream format identifier */ static int get_sindex(AVFormatContext *s, int id, int format) { int i; AVStream *st = NULL; i = ff_find_stream_index(s, id); if (i >= 0) return i; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->id = id; switch (format) { case 3: case 4: st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_MJPEG; break; case 13: case 14: case 15: case 16: case 25: st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_DVVIDEO; break; case 11: case 12: case 20: st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_MPEG2VIDEO; st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. break; case 22: case 23: st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_MPEG1VIDEO; st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. break; case 9: st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE; st->codecpar->channels = 1; st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; st->codecpar->sample_rate = 48000; st->codecpar->bit_rate = 3 * 1 * 48000 * 8; st->codecpar->block_align = 3 * 1; st->codecpar->bits_per_coded_sample = 24; break; case 10: st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; st->codecpar->channels = 1; st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; st->codecpar->sample_rate = 48000; st->codecpar->bit_rate = 2 * 1 * 48000 * 8; st->codecpar->block_align = 2 * 1; st->codecpar->bits_per_coded_sample = 16; break; case 17: st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_AC3; st->codecpar->channels = 2; st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; st->codecpar->sample_rate = 48000; break; case 26: /* AVCi50 / AVCi100 (AVC Intra) */ case 29: /* AVCHD */ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_H264; st->need_parsing = AVSTREAM_PARSE_HEADERS; break; // timecode tracks: case 7: case 8: case 24: st->codecpar->codec_type = AVMEDIA_TYPE_DATA; st->codecpar->codec_id = AV_CODEC_ID_NONE; break; case 30: st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_DNXHD; break; default: st->codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN; st->codecpar->codec_id = AV_CODEC_ID_NONE; break; } return s->nb_streams - 1; } /** * @brief filters out interesting tags from material information. * @param len length of tag section, will be adjusted to contain remaining bytes * @param si struct to store collected information into */ static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { si->first_field = AV_NOPTS_VALUE; si->last_field = AV_NOPTS_VALUE; while (*len >= 2) { GXFMatTag tag = avio_r8(pb); int tlen = avio_r8(pb); *len -= 2; if (tlen > *len) return; *len -= tlen; if (tlen == 4) { uint32_t value = avio_rb32(pb); if (tag == MAT_FIRST_FIELD) si->first_field = value; else if (tag == MAT_LAST_FIELD) si->last_field = value; } else avio_skip(pb, tlen); } } static const AVRational frame_rate_tab[] = { { 60, 1}, {60000, 1001}, { 50, 1}, { 30, 1}, {30000, 1001}, { 25, 1}, { 24, 1}, {24000, 1001}, { 0, 0}, }; /** * @brief convert fps tag value to AVRational fps * @param fps fps value from tag * @return fps as AVRational, or 0 / 0 if unknown */ static AVRational fps_tag2avr(int32_t fps) { if (fps < 1 || fps > 9) fps = 9; return frame_rate_tab[fps - 1]; } /** * @brief convert UMF attributes flags to AVRational fps * @param flags UMF flags to convert * @return fps as AVRational, or 0 / 0 if unknown */ static AVRational fps_umf2avr(uint32_t flags) { static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1}, {25, 1}, {30000, 1001}}; int idx = av_log2((flags & 0x7c0) >> 6); return map[idx]; } /** * @brief filters out interesting tags from track information. * @param len length of tag section, will be adjusted to contain remaining bytes * @param si struct to store collected information into */ static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { si->frames_per_second = (AVRational){0, 0}; si->fields_per_frame = 0; si->track_aux_data = 0x80000000; while (*len >= 2) { GXFTrackTag tag = avio_r8(pb); int tlen = avio_r8(pb); *len -= 2; if (tlen > *len) return; *len -= tlen; if (tlen == 4) { uint32_t value = avio_rb32(pb); if (tag == TRACK_FPS) si->frames_per_second = fps_tag2avr(value); else if (tag == TRACK_FPF && (value == 1 || value == 2)) si->fields_per_frame = value; } else if (tlen == 8 && tag == TRACK_AUX) si->track_aux_data = avio_rl64(pb); else avio_skip(pb, tlen); } } /** * @brief read index from FLT packet into stream 0 av_index */ static void gxf_read_index(AVFormatContext *s, int pkt_len) { AVIOContext *pb = s->pb; AVStream *st; uint32_t fields_per_map, map_cnt; int i; if (pkt_len < 8) return; fields_per_map = avio_rl32(pb); map_cnt = avio_rl32(pb); pkt_len -= 8; if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) { avio_skip(pb, pkt_len); return; } st = s->streams[0]; if (map_cnt > 1000) { av_log(s, AV_LOG_ERROR, "too many index entries %"PRIu32" (%"PRIx32")\n", map_cnt, map_cnt); map_cnt = 1000; } if (pkt_len < 4 * map_cnt) { av_log(s, AV_LOG_ERROR, "invalid index length\n"); avio_skip(pb, pkt_len); return; } pkt_len -= 4 * map_cnt; av_add_index_entry(st, 0, 0, 0, 0, 0); for (i = 0; i < map_cnt; i++) av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024, i * (uint64_t)fields_per_map + 1, 0, 0, 0); avio_skip(pb, pkt_len); } static int gxf_header(AVFormatContext *s) { AVIOContext *pb = s->pb; GXFPktType pkt_type; int map_len; int len; AVRational main_timebase = {0, 0}; struct gxf_stream_info *si = s->priv_data; int i; if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) { av_log(s, AV_LOG_ERROR, "map packet not found\n"); return 0; } map_len -= 2; if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) { av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n"); return 0; } map_len -= 2; len = avio_rb16(pb); // length of material data section if (len > map_len) { av_log(s, AV_LOG_ERROR, "material data longer than map data\n"); return 0; } map_len -= len; gxf_material_tags(pb, &len, si); avio_skip(pb, len); map_len -= 2; len = avio_rb16(pb); // length of track description if (len > map_len) { av_log(s, AV_LOG_ERROR, "track description longer than map data\n"); return 0; } map_len -= len; while (len > 0) { int track_type, track_id, track_len; AVStream *st; int idx; len -= 4; track_type = avio_r8(pb); track_id = avio_r8(pb); track_len = avio_rb16(pb); len -= track_len; if (!(track_type & 0x80)) { av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type); continue; } track_type &= 0x7f; if ((track_id & 0xc0) != 0xc0) { av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id); continue; } track_id &= 0x3f; gxf_track_tags(pb, &track_len, si); // check for timecode tracks if (track_type == 7 || track_type == 8 || track_type == 24) { add_timecode_metadata(&s->metadata, "timecode", si->track_aux_data & 0xffffffff, si->fields_per_frame); } avio_skip(pb, track_len); idx = get_sindex(s, track_id, track_type); if (idx < 0) continue; st = s->streams[idx]; if (!main_timebase.num || !main_timebase.den) { main_timebase.num = si->frames_per_second.den; main_timebase.den = si->frames_per_second.num * 2; } st->start_time = si->first_field; if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE) st->duration = si->last_field - si->first_field; } if (len < 0) av_log(s, AV_LOG_ERROR, "invalid track description length specified\n"); if (map_len) avio_skip(pb, map_len); if (!parse_packet_header(pb, &pkt_type, &len)) { av_log(s, AV_LOG_ERROR, "sync lost in header\n"); return -1; } if (pkt_type == PKT_FLT) { gxf_read_index(s, len); if (!parse_packet_header(pb, &pkt_type, &len)) { av_log(s, AV_LOG_ERROR, "sync lost in header\n"); return -1; } } if (pkt_type == PKT_UMF) { if (len >= 0x39) { AVRational fps; len -= 0x39; avio_skip(pb, 5); // preamble avio_skip(pb, 0x30); // payload description fps = fps_umf2avr(avio_rl32(pb)); if (!main_timebase.num || !main_timebase.den) { av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag." " This might give wrong results.\n"); // this may not always be correct, but simply the best we can get main_timebase.num = fps.den; main_timebase.den = fps.num * 2; } if (len >= 0x18) { len -= 0x18; avio_skip(pb, 0x10); add_timecode_metadata(&s->metadata, "timecode_at_mark_in", avio_rl32(pb), si->fields_per_frame); add_timecode_metadata(&s->metadata, "timecode_at_mark_out", avio_rl32(pb), si->fields_per_frame); } } else av_log(s, AV_LOG_INFO, "UMF packet too short\n"); } else av_log(s, AV_LOG_INFO, "UMF packet missing\n"); avio_skip(pb, len); // set a fallback value, 60000/1001 is specified for audio-only files // so use that regardless of why we do not know the video frame rate. if (!main_timebase.num || !main_timebase.den) main_timebase = (AVRational){1001, 60000}; for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den); } return 0; } #define READ_ONE() \ { \ if (!max_interval-- || avio_feof(pb)) \ goto out; \ tmp = tmp << 8 | avio_r8(pb); \ } /** * @brief resync the stream on the next media packet with specified properties * @param max_interval how many bytes to search for matching packet at most * @param track track id the media packet must belong to, -1 for any * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any * @return timestamp of packet found */ static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) { uint32_t tmp; uint64_t last_pos; uint64_t last_found_pos = 0; int cur_track; int64_t cur_timestamp = AV_NOPTS_VALUE; int len; AVIOContext *pb = s->pb; GXFPktType type; tmp = avio_rb32(pb); start: while (tmp) READ_ONE(); READ_ONE(); if (tmp != 1) goto start; last_pos = avio_tell(pb); if (avio_seek(pb, -5, SEEK_CUR) < 0) goto out; if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) { if (avio_seek(pb, last_pos, SEEK_SET) < 0) goto out; goto start; } avio_r8(pb); cur_track = avio_r8(pb); cur_timestamp = avio_rb32(pb); last_found_pos = avio_tell(pb) - 16 - 6; if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) { if (avio_seek(pb, last_pos, SEEK_SET) >= 0) goto start; } out: if (last_found_pos) avio_seek(pb, last_found_pos, SEEK_SET); return cur_timestamp; } static int gxf_packet(AVFormatContext *s, AVPacket *pkt) { AVIOContext *pb = s->pb; GXFPktType pkt_type; int pkt_len; struct gxf_stream_info *si = s->priv_data; while (!pb->eof_reached) { AVStream *st; int track_type, track_id, ret; int field_nr, field_info, skip = 0; int stream_index; if (!parse_packet_header(pb, &pkt_type, &pkt_len)) { if (!avio_feof(pb)) av_log(s, AV_LOG_ERROR, "sync lost\n"); return -1; } if (pkt_type == PKT_FLT) { gxf_read_index(s, pkt_len); continue; } if (pkt_type != PKT_MEDIA) { avio_skip(pb, pkt_len); continue; } if (pkt_len < 16) { av_log(s, AV_LOG_ERROR, "invalid media packet length\n"); continue; } pkt_len -= 16; track_type = avio_r8(pb); track_id = avio_r8(pb); stream_index = get_sindex(s, track_id, track_type); if (stream_index < 0) return stream_index; st = s->streams[stream_index]; field_nr = avio_rb32(pb); field_info = avio_rb32(pb); avio_rb32(pb); // "timeline" field number avio_r8(pb); // flags avio_r8(pb); // reserved if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE || st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) { int first = field_info >> 16; int last = field_info & 0xffff; // last is exclusive int bps = av_get_bits_per_sample(st->codecpar->codec_id)>>3; if (first <= last && last*bps <= pkt_len) { avio_skip(pb, first*bps); skip = pkt_len - last*bps; pkt_len = (last-first)*bps; } else av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n"); } ret = av_get_packet(pb, pkt, pkt_len); if (skip) avio_skip(pb, skip); pkt->stream_index = stream_index; pkt->dts = field_nr; //set duration manually for DV or else lavf misdetects the frame rate if (st->codecpar->codec_id == AV_CODEC_ID_DVVIDEO) pkt->duration = si->fields_per_frame; return ret; } return AVERROR_EOF; } static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { int64_t res = 0; uint64_t pos; uint64_t maxlen = 100 * 1024 * 1024; AVStream *st = s->streams[0]; int64_t start_time = s->streams[stream_index]->start_time; int64_t found; int idx; if (timestamp < start_time) timestamp = start_time; idx = av_index_search_timestamp(st, timestamp - start_time, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); if (idx < 0) return -1; pos = st->internal->index_entries[idx].pos; if (idx < st->internal->nb_index_entries - 2) maxlen = st->internal->index_entries[idx + 2].pos - pos; maxlen = FFMAX(maxlen, 200 * 1024); res = avio_seek(s->pb, pos, SEEK_SET); if (res < 0) return res; found = gxf_resync_media(s, maxlen, -1, timestamp); if (FFABS(found - timestamp) > 4) return -1; return 0; } static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit) { AVIOContext *pb = s->pb; int64_t res; if (avio_seek(pb, *pos, SEEK_SET) < 0) return AV_NOPTS_VALUE; res = gxf_resync_media(s, pos_limit - *pos, -1, -1); *pos = avio_tell(pb); return res; } AVInputFormat ff_gxf_demuxer = { .name = "gxf", .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"), .priv_data_size = sizeof(struct gxf_stream_info), .read_probe = gxf_probe, .read_header = gxf_header, .read_packet = gxf_packet, .read_seek = gxf_seek, .read_timestamp = gxf_read_timestamp, };