/*
* GXF demuxer.
- * Copyright (c) 2006 Reimar Doeffinger.
+ * Copyright (c) 2006 Reimar Doeffinger
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
+#include "libavutil/common.h"
#include "avformat.h"
-#include "avi.h"
+#include "internal.h"
+#include "gxf.h"
+#include "libavcodec/mpeg12data.h"
-typedef enum {
- PKT_MAP = 0xbc,
- PKT_MEDIA = 0xbf,
- PKT_EOS = 0xfb,
- PKT_FLT = 0xfc,
- PKT_UMF = 0xfd
-} pkt_type_t;
+struct gxf_stream_info {
+ int64_t first_field;
+ int64_t last_field;
+ AVRational frames_per_second;
+ int32_t fields_per_frame;
+};
/**
- * \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
+ * @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(ByteIOContext *pb, pkt_type_t *type, int *length) {
- if (get_be32(pb))
+static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) {
+ if (avio_rb32(pb))
return 0;
- if (get_byte(pb) != 1)
+ if (avio_r8(pb) != 1)
return 0;
- *type = get_byte(pb);
- *length = get_be32(pb);
+ *type = avio_r8(pb);
+ *length = avio_rb32(pb);
if ((*length >> 24) || *length < 16)
return 0;
*length -= 16;
- if (get_be32(pb))
+ if (avio_rb32(pb))
return 0;
- if (get_byte(pb) != 0xe1)
+ if (avio_r8(pb) != 0xe1)
return 0;
- if (get_byte(pb) != 0xe2)
+ if (avio_r8(pb) != 0xe2)
return 0;
return 1;
}
/**
- * \brief check if file starts with a PKT_MAP header
+ * @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;
}
/**
- * \brief gets the stream index for the track with the specified id, creates new
+ * @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
+ * @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;
- for (i = 0; i < s->nb_streams; i++) {
- if (s->streams[i]->id == id)
- return i;
- }
- st = av_new_stream(s, id);
+ 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 = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MJPEG;
- st->codec->codec_tag = MKTAG('M', 'J', 'P', 'G');
+ st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codec->codec_id = AV_CODEC_ID_MJPEG;
break;
case 13:
case 15:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DVVIDEO;
- st->codec->codec_tag = MKTAG('d', 'v', 'c', ' ');
+ st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codec->codec_id = AV_CODEC_ID_DVVIDEO;
break;
case 14:
case 16:
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DVVIDEO;
- st->codec->codec_tag = MKTAG('d', 'v', 'c', 'p');
+ 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 = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MPEG2VIDEO;
- st->codec->codec_tag = MKTAG('M', 'P', 'G', '2');
+ 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 = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_MPEG1VIDEO;
- st->codec->codec_tag = MKTAG('M', 'P', 'G', '1');
+ 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 = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_PCM_S24LE;
- st->codec->codec_tag = 0x1;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_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;
+ st->codec->bits_per_coded_sample = 24;
break;
case 10:
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_PCM_S16LE;
- st->codec->codec_tag = 0x1;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_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;
+ st->codec->bits_per_coded_sample = 16;
break;
case 17:
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_AC3;
- st->codec->codec_tag = 0x2000;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_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 = AVMEDIA_TYPE_DATA;
+ st->codec->codec_id = AV_CODEC_ID_NONE;
+ break;
default:
- st->codec->codec_type = CODEC_TYPE_UNKNOWN;
- st->codec->codec_id = CODEC_ID_NONE;
+ st->codec->codec_type = AVMEDIA_TYPE_UNKNOWN;
+ st->codec->codec_id = AV_CODEC_ID_NONE;
break;
}
return s->nb_streams - 1;
}
-static int gxf_header(AVFormatContext *s, AVFormatParameters *ap) {
- ByteIOContext *pb = &s->pb;
- pkt_type_t pkt_type;
+/**
+ * @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;
+ 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
+ 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 = s->streams[0];
+ 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) {
+ avio_skip(pb, pkt_len);
+ return;
+ }
+ 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, "GXF: map packet not found\n");
+ av_log(s, AV_LOG_ERROR, "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");
+ 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 = get_be16(pb); // length of material data section
+ len = avio_rb16(pb); // length of material data section
if (len > map_len) {
- av_log(s, AV_LOG_ERROR, "GXF: material data longer than map data\n");
+ av_log(s, AV_LOG_ERROR, "material data longer than map data\n");
return 0;
}
map_len -= len;
- url_fskip(pb, len);
+ gxf_material_tags(pb, &len, si);
+ avio_skip(pb, len);
map_len -= 2;
- len = get_be16(pb); // length of track description
+ len = avio_rb16(pb); // length of track description
if (len > map_len) {
- av_log(s, AV_LOG_ERROR, "GXF: track description longer than map data\n");
+ 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 = get_byte(pb);
- track_id = get_byte(pb);
- track_len = get_be16(pb);
+ track_type = avio_r8(pb);
+ track_id = avio_r8(pb);
+ track_len = avio_rb16(pb);
len -= track_len;
- url_fskip(pb, track_len);
+ gxf_track_tags(pb, &track_len, si);
+ avio_skip(pb, track_len);
if (!(track_type & 0x80)) {
- av_log(s, AV_LOG_ERROR, "GXF: invalid track type %x\n", track_type);
+ 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, "GXF: invalid track id %x\n", track_id);
+ av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id);
continue;
}
track_id &= 0x3f;
- get_sindex(s, track_id, track_type);
+ 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, "GXF: invalid track description length specified\n");
+ av_log(s, AV_LOG_ERROR, "invalid track description length specified\n");
if (map_len)
- url_fskip(pb, 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) {
+ // this may not always be correct, but simply the best we can get
+ main_timebase.num = fps.den;
+ main_timebase.den = fps.num * 2;
+ }
+ } 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-- || pb->eof_reached) \
+ 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) {
- ByteIOContext *pb = &s->pb;
- pkt_type_t pkt_type;
+ AVIOContext *pb = s->pb;
+ GXFPktType pkt_type;
int pkt_len;
- while (!url_feof(pb)) {
+ 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, "GXF: sync lost\n");
+ if (!pb->eof_reached)
+ 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) {
- url_fskip(pb, pkt_len);
+ avio_skip(pb, pkt_len);
continue;
}
if (pkt_len < 16) {
- av_log(s, AV_LOG_ERROR, "GXF: invalid media packet length\n");
+ av_log(s, AV_LOG_ERROR, "invalid media packet length\n");
continue;
}
pkt_len -= 16;
- track_type = get_byte(pb);
- track_id = get_byte(pb);
- get_be32(pb); // field number
- 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 int account
- // as well.
+ 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);
- pkt->stream_index = get_sindex(s, track_id, track_type);
+ 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_IO;
+ return AVERROR(EIO);
}
-static AVInputFormat gxf_iformat = {
- "gxf",
- "GXF format",
- 0,
- gxf_probe,
- gxf_header,
- gxf_packet,
- NULL,
- NULL,
-};
-
-int gxf_init(void) {
- av_register_input_format(&gxf_iformat);
+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,
+};
projects / ffmpeg / blobdiff