| /* | |
| * 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 "demux.h" | |
| #include "internal.h" | |
| #include "gxf.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; | |
| FFStream *sti; | |
| i = ff_find_stream_index(s, id); | |
| if (i >= 0) | |
| return i; | |
| st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| sti = ffstream(st); | |
| 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; | |
| sti->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; | |
| sti->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->ch_layout = (AVChannelLayout)AV_CHANNEL_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->ch_layout = (AVChannelLayout)AV_CHANNEL_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->ch_layout = (AVChannelLayout)AV_CHANNEL_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; | |
| sti->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]; | |
| FFStream *const sti = ffstream(st); | |
| 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 = sti->index_entries[idx].pos; | |
| if (idx < sti->nb_index_entries - 2) | |
| maxlen = sti->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; | |
| } | |
| const FFInputFormat ff_gxf_demuxer = { | |
| .p.name = "gxf", | |
| .p.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, | |
| }; |