summaryrefslogtreecommitdiff
path: root/ffmpeg/libavformat/gxf.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg/libavformat/gxf.c')
-rw-r--r--ffmpeg/libavformat/gxf.c604
1 files changed, 0 insertions, 604 deletions
diff --git a/ffmpeg/libavformat/gxf.c b/ffmpeg/libavformat/gxf.c
deleted file mode 100644
index c36479a..0000000
--- a/ffmpeg/libavformat/gxf.c
+++ /dev/null
@@ -1,604 +0,0 @@
-/*
- * 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 "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(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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_MJPEG;
- break;
- case 13:
- case 14:
- case 15:
- case 16:
- case 25:
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_DVVIDEO;
- break;
- case 11:
- case 12:
- case 20:
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_MPEG2VIDEO;
- st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
- break;
- case 22:
- case 23:
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_MPEG1VIDEO;
- st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
- break;
- case 9:
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
- st->codec->channels = 1;
- st->codec->channel_layout = AV_CH_LAYOUT_MONO;
- st->codec->sample_rate = 48000;
- st->codec->bit_rate = 3 * 1 * 48000 * 8;
- st->codec->block_align = 3 * 1;
- st->codec->bits_per_coded_sample = 24;
- break;
- case 10:
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
- st->codec->channels = 1;
- st->codec->channel_layout = AV_CH_LAYOUT_MONO;
- st->codec->sample_rate = 48000;
- st->codec->bit_rate = 2 * 1 * 48000 * 8;
- st->codec->block_align = 2 * 1;
- st->codec->bits_per_coded_sample = 16;
- break;
- case 17:
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = AV_CODEC_ID_AC3;
- st->codec->channels = 2;
- st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
- st->codec->sample_rate = 48000;
- break;
- case 26: /* AVCi50 / AVCi100 (AVC Intra) */
- case 29: /* AVCHD */
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_H264;
- st->need_parsing = AVSTREAM_PARSE_HEADERS;
- break;
- // timecode tracks:
- case 7:
- case 8:
- case 24:
- st->codec->codec_type = AVMEDIA_TYPE_DATA;
- st->codec->codec_id = AV_CODEC_ID_NONE;
- break;
- case 30:
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_DNXHD;
- break;
- default:
- st->codec->codec_type = AVMEDIA_TYPE_UNKNOWN;
- st->codec->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 = avio_rl32(pb);
- uint32_t map_cnt = avio_rl32(pb);
- int i;
- 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 %u (%x)\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-- || url_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 (!url_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->codec->codec_id == AV_CODEC_ID_PCM_S24LE ||
- st->codec->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->codec->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->codec->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) {
- int 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->index_entries[idx].pos;
- if (idx < st->nb_index_entries - 2)
- maxlen = st->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,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 08:56:42 +0000