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Diffstat (limited to 'contrib/ffmpeg/libavformat/gxf.c')
-rw-r--r--contrib/ffmpeg/libavformat/gxf.c524
1 files changed, 0 insertions, 524 deletions
diff --git a/contrib/ffmpeg/libavformat/gxf.c b/contrib/ffmpeg/libavformat/gxf.c
deleted file mode 100644
index ba2463ead..000000000
--- a/contrib/ffmpeg/libavformat/gxf.c
+++ /dev/null
@@ -1,524 +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 "avformat.h"
-#include "common.h"
-
-typedef enum {
- PKT_MAP = 0xbc,
- PKT_MEDIA = 0xbf,
- PKT_EOS = 0xfb,
- PKT_FLT = 0xfc,
- PKT_UMF = 0xfd
-} pkt_type_t;
-
-typedef enum {
- MAT_NAME = 0x40,
- MAT_FIRST_FIELD = 0x41,
- MAT_LAST_FIELD = 0x42,
- MAT_MARK_IN = 0x43,
- MAT_MARK_OUT = 0x44,
- MAT_SIZE = 0x45
-} mat_tag_t;
-
-typedef enum {
- TRACK_NAME = 0x4c,
- TRACK_AUX = 0x4d,
- TRACK_VER = 0x4e,
- TRACK_MPG_AUX = 0x4f,
- TRACK_FPS = 0x50,
- TRACK_LINES = 0x51,
- TRACK_FPF = 0x52
-} track_tag_t;
-
-typedef struct {
- int64_t first_field;
- int64_t last_field;
- AVRational frames_per_second;
- int32_t fields_per_frame;
-} st_info_t;
-
-/**
- * \brief parses a packet header, extracting type and length
- * \param pb ByteIOContext 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(ByteIOContext *pb, pkt_type_t *type, int *length) {
- if (get_be32(pb))
- return 0;
- if (get_byte(pb) != 1)
- return 0;
- *type = get_byte(pb);
- *length = get_be32(pb);
- if ((*length >> 24) || *length < 16)
- return 0;
- *length -= 16;
- if (get_be32(pb))
- return 0;
- if (get_byte(pb) != 0xe1)
- return 0;
- if (get_byte(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 (p->buf_size < 16)
- return 0;
- 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 stream 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;
- for (i = 0; i < s->nb_streams; i++) {
- if (s->streams[i]->id == id)
- return i;
- }
- st = av_new_stream(s, id);
- switch (format) {
- case 3:
- case 4:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MJPEG;
- break;
- case 13:
- case 15:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DVVIDEO;
- break;
- case 14:
- case 16:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DVVIDEO;
- break;
- case 11:
- case 12:
- case 20:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MPEG2VIDEO;
- st->need_parsing = 2; // get keyframe flag etc.
- break;
- case 22:
- case 23:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MPEG1VIDEO;
- st->need_parsing = 2; // get keyframe flag etc.
- break;
- case 9:
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_PCM_S24LE;
- st->codec->channels = 1;
- st->codec->sample_rate = 48000;
- st->codec->bit_rate = 3 * 1 * 48000 * 8;
- st->codec->block_align = 3 * 1;
- st->codec->bits_per_sample = 24;
- break;
- case 10:
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_PCM_S16LE;
- st->codec->channels = 1;
- st->codec->sample_rate = 48000;
- st->codec->bit_rate = 2 * 1 * 48000 * 8;
- st->codec->block_align = 2 * 1;
- st->codec->bits_per_sample = 16;
- break;
- case 17:
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_AC3;
- st->codec->channels = 2;
- st->codec->sample_rate = 48000;
- break;
- // timecode tracks:
- case 7:
- case 8:
- case 24:
- st->codec->codec_type = CODEC_TYPE_DATA;
- st->codec->codec_id = CODEC_ID_NONE;
- break;
- default:
- st->codec->codec_type = CODEC_TYPE_UNKNOWN;
- st->codec->codec_id = CODEC_ID_NONE;
- break;
- }
- return s->nb_streams - 1;
-}
-
-/**
- * \brief filters out interesting tags from material information.
- * \param len lenght of tag section, will be adjusted to contain remaining bytes
- * \param si struct to store collected information into
- */
-static void gxf_material_tags(ByteIOContext *pb, int *len, st_info_t *si) {
- si->first_field = AV_NOPTS_VALUE;
- si->last_field = AV_NOPTS_VALUE;
- while (*len >= 2) {
- mat_tag_t tag = get_byte(pb);
- int tlen = get_byte(pb);
- *len -= 2;
- if (tlen > *len)
- return;
- *len -= tlen;
- if (tlen == 4) {
- uint32_t value = get_be32(pb);
- if (tag == MAT_FIRST_FIELD)
- si->first_field = value;
- else if (tag == MAT_LAST_FIELD)
- si->last_field = value;
- } else
- url_fskip(pb, tlen);
- }
-}
-
-/**
- * \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) {
- extern const AVRational ff_frame_rate_tab[];
- if (fps < 1 || fps > 9) fps = 9;
- return ff_frame_rate_tab[9 - fps]; // values have opposite order
-}
-
-/**
- * \brief convert UMF attributes flags to AVRational fps
- * \param fps fps value from flags
- * \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(ByteIOContext *pb, int *len, st_info_t *si) {
- si->frames_per_second = (AVRational){0, 0};
- si->fields_per_frame = 0;
- while (*len >= 2) {
- track_tag_t tag = get_byte(pb);
- int tlen = get_byte(pb);
- *len -= 2;
- if (tlen > *len)
- return;
- *len -= tlen;
- if (tlen == 4) {
- uint32_t value = get_be32(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
- url_fskip(pb, tlen);
- }
-}
-
-/**
- * \brief read index from FLT packet into stream 0 av_index
- */
-static void gxf_read_index(AVFormatContext *s, int pkt_len) {
- ByteIOContext *pb = &s->pb;
- AVStream *st = s->streams[0];
- uint32_t fields_per_map = get_le32(pb);
- uint32_t map_cnt = get_le32(pb);
- int i;
- pkt_len -= 8;
- if (map_cnt > 1000) {
- av_log(s, AV_LOG_ERROR, "GXF: 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, "GXF: invalid index length\n");
- url_fskip(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)get_le32(pb) * 1024,
- i * (uint64_t)fields_per_map + 1, 0, 0, 0);
- url_fskip(pb, pkt_len);
-}
-
-static int gxf_header(AVFormatContext *s, AVFormatParameters *ap) {
- ByteIOContext *pb = &s->pb;
- pkt_type_t pkt_type;
- int map_len;
- int len;
- AVRational main_timebase = {0, 0};
- st_info_t si;
- int i;
- if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
- av_log(s, AV_LOG_ERROR, "GXF: map packet not found\n");
- return 0;
- }
- map_len -= 2;
- if (get_byte(pb) != 0x0e0 || get_byte(pb) != 0xff) {
- av_log(s, AV_LOG_ERROR, "GXF: unknown version or invalid map preamble\n");
- return 0;
- }
- map_len -= 2;
- len = get_be16(pb); // length of material data section
- if (len > map_len) {
- av_log(s, AV_LOG_ERROR, "GXF: material data longer than map data\n");
- return 0;
- }
- map_len -= len;
- gxf_material_tags(pb, &len, &si);
- url_fskip(pb, len);
- map_len -= 2;
- len = get_be16(pb); // length of track description
- if (len > map_len) {
- av_log(s, AV_LOG_ERROR, "GXF: 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 = get_byte(pb);
- track_id = get_byte(pb);
- track_len = get_be16(pb);
- len -= track_len;
- gxf_track_tags(pb, &track_len, &si);
- url_fskip(pb, track_len);
- if (!(track_type & 0x80)) {
- av_log(s, AV_LOG_ERROR, "GXF: invalid track type %x\n", track_type);
- continue;
- }
- track_type &= 0x7f;
- if ((track_id & 0xc0) != 0xc0) {
- av_log(s, AV_LOG_ERROR, "GXF: invalid track id %x\n", track_id);
- continue;
- }
- track_id &= 0x3f;
- 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 * si.fields_per_frame;
- }
- 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, "GXF: invalid track description length specified\n");
- if (map_len)
- url_fskip(pb, map_len);
- if (!parse_packet_header(pb, &pkt_type, &len)) {
- av_log(s, AV_LOG_ERROR, "GXF: 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, "GXF: sync lost in header\n");
- return -1;
- }
- }
- if (pkt_type == PKT_UMF) {
- if (len >= 0x39) {
- AVRational fps;
- len -= 0x39;
- url_fskip(pb, 5); // preamble
- url_fskip(pb, 0x30); // payload description
- fps = fps_umf2avr(get_le32(pb));
- if (!main_timebase.num || !main_timebase.den) {
- // this may not always be correct, but simply the best we can get
- main_timebase.num = fps.den;
- main_timebase.den = fps.num;
- }
- } else
- av_log(s, AV_LOG_INFO, "GXF: UMF packet too short\n");
- } else
- av_log(s, AV_LOG_INFO, "GXF: UMF packet missing\n");
- url_fskip(pb, len);
- if (!main_timebase.num || !main_timebase.den)
- main_timebase = (AVRational){1, 50}; // set some arbitrary fallback
- for (i = 0; i < s->nb_streams; i++) {
- AVStream *st = s->streams[i];
- av_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 | get_byte(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;
- ByteIOContext *pb = &s->pb;
- pkt_type_t type;
- tmp = get_be32(pb);
-start:
- while (tmp)
- READ_ONE();
- READ_ONE();
- if (tmp != 1)
- goto start;
- last_pos = url_ftell(pb);
- url_fseek(pb, -5, SEEK_CUR);
- if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) {
- url_fseek(pb, last_pos, SEEK_SET);
- goto start;
- }
- get_byte(pb);
- cur_track = get_byte(pb);
- cur_timestamp = get_be32(pb);
- last_found_pos = url_ftell(pb) - 16 - 6;
- if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) {
- url_fseek(pb, last_pos, SEEK_SET);
- goto start;
- }
-out:
- if (last_found_pos)
- url_fseek(pb, last_found_pos, SEEK_SET);
- return cur_timestamp;
-}
-
-static int gxf_packet(AVFormatContext *s, AVPacket *pkt) {
- ByteIOContext *pb = &s->pb;
- pkt_type_t pkt_type;
- int pkt_len;
- while (!url_feof(pb)) {
- int track_type, track_id, ret;
- int field_nr;
- if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
- if (!url_feof(pb))
- av_log(s, AV_LOG_ERROR, "GXF: sync lost\n");
- return -1;
- }
- if (pkt_type == PKT_FLT) {
- gxf_read_index(s, pkt_len);
- continue;
- }
- if (pkt_type != PKT_MEDIA) {
- url_fskip(pb, pkt_len);
- continue;
- }
- if (pkt_len < 16) {
- av_log(s, AV_LOG_ERROR, "GXF: invalid media packet length\n");
- continue;
- }
- pkt_len -= 16;
- track_type = get_byte(pb);
- track_id = get_byte(pb);
- field_nr = get_be32(pb);
- get_be32(pb); // field information
- get_be32(pb); // "timeline" field number
- get_byte(pb); // flags
- get_byte(pb); // reserved
- // NOTE: there is also data length information in the
- // field information, it might be better to take this into account
- // as well.
- ret = av_get_packet(pb, pkt, pkt_len);
- pkt->stream_index = get_sindex(s, track_id, track_type);
- pkt->dts = field_nr;
- return ret;
- }
- return AVERROR_IO;
-}
-
-static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
- 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);
- url_fseek(&s->pb, pos, SEEK_SET);
- 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) {
- ByteIOContext *pb = &s->pb;
- int64_t res;
- url_fseek(pb, *pos, SEEK_SET);
- res = gxf_resync_media(s, pos_limit - *pos, -1, -1);
- *pos = url_ftell(pb);
- return res;
-}
-
-AVInputFormat gxf_demuxer = {
- "gxf",
- "GXF format",
- 0,
- gxf_probe,
- gxf_header,
- gxf_packet,
- NULL,
- gxf_seek,
- gxf_read_timestamp,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 09:07:38 +0000