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Diffstat (limited to 'ffmpeg/libavformat/lxfdec.c')
-rw-r--r--ffmpeg/libavformat/lxfdec.c342
1 files changed, 0 insertions, 342 deletions
diff --git a/ffmpeg/libavformat/lxfdec.c b/ffmpeg/libavformat/lxfdec.c
deleted file mode 100644
index f0a9639..0000000
--- a/ffmpeg/libavformat/lxfdec.c
+++ /dev/null
@@ -1,342 +0,0 @@
-/*
- * LXF demuxer
- * Copyright (c) 2010 Tomas Härdin
- *
- * 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/intreadwrite.h"
-#include "libavcodec/bytestream.h"
-#include "avformat.h"
-#include "internal.h"
-
-#define LXF_MAX_PACKET_HEADER_SIZE 256
-#define LXF_HEADER_DATA_SIZE 120
-#define LXF_IDENT "LEITCH\0"
-#define LXF_IDENT_LENGTH 8
-#define LXF_SAMPLERATE 48000
-
-static const AVCodecTag lxf_tags[] = {
- { AV_CODEC_ID_MJPEG, 0 },
- { AV_CODEC_ID_MPEG1VIDEO, 1 },
- { AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0
- { AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2
- { AV_CODEC_ID_DVVIDEO, 4 }, //DV25
- { AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO
- { AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50
- { AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying
- { AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key
- { AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop")
- { AV_CODEC_ID_NONE, 0 },
-};
-
-typedef struct {
- int channels; ///< number of audio channels. zero means no audio
- int frame_number; ///< current video frame
- uint32_t video_format, packet_type, extended_size;
-} LXFDemuxContext;
-
-static int lxf_probe(AVProbeData *p)
-{
- if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
- return AVPROBE_SCORE_MAX;
-
- return 0;
-}
-
-/**
- * Verify the checksum of an LXF packet header
- *
- * @param[in] header the packet header to check
- * @return zero if the checksum is OK, non-zero otherwise
- */
-static int check_checksum(const uint8_t *header, int size)
-{
- int x;
- uint32_t sum = 0;
-
- for (x = 0; x < size; x += 4)
- sum += AV_RL32(&header[x]);
-
- return sum;
-}
-
-/**
- * Read input until we find the next ident. If found, copy it to the header buffer
- *
- * @param[out] header where to copy the ident to
- * @return 0 if an ident was found, < 0 on I/O error
- */
-static int sync(AVFormatContext *s, uint8_t *header)
-{
- uint8_t buf[LXF_IDENT_LENGTH];
- int ret;
-
- if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
- return ret < 0 ? ret : AVERROR_EOF;
-
- while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
- if (url_feof(s->pb))
- return AVERROR_EOF;
-
- memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
- buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
- }
-
- memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH);
-
- return 0;
-}
-
-/**
- * Read and checksum the next packet header
- *
- * @return the size of the payload following the header or < 0 on failure
- */
-static int get_packet_header(AVFormatContext *s)
-{
- LXFDemuxContext *lxf = s->priv_data;
- AVIOContext *pb = s->pb;
- int track_size, samples, ret;
- uint32_t version, audio_format, header_size, channels, tmp;
- AVStream *st;
- uint8_t header[LXF_MAX_PACKET_HEADER_SIZE];
- const uint8_t *p = header + LXF_IDENT_LENGTH;
-
- //find and read the ident
- if ((ret = sync(s, header)) < 0)
- return ret;
-
- ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
- if (ret != 8)
- return ret < 0 ? ret : AVERROR_EOF;
-
- version = bytestream_get_le32(&p);
- header_size = bytestream_get_le32(&p);
- if (version > 1)
- avpriv_request_sample(s, "Unknown format version %i\n", version);
-
- if (header_size < (version ? 72 : 60) ||
- header_size > LXF_MAX_PACKET_HEADER_SIZE ||
- (header_size & 3)) {
- av_log(s, AV_LOG_ERROR, "Invalid header size 0x%x\n", header_size);
- return AVERROR_INVALIDDATA;
- }
-
- //read the rest of the packet header
- if ((ret = avio_read(pb, header + (p - header),
- header_size - (p - header))) !=
- header_size - (p - header))
- return ret < 0 ? ret : AVERROR_EOF;
-
- if (check_checksum(header, header_size))
- av_log(s, AV_LOG_ERROR, "checksum error\n");
-
- lxf->packet_type = bytestream_get_le32(&p);
- p += version ? 20 : 12;
-
- lxf->extended_size = 0;
- switch (lxf->packet_type) {
- case 0:
- //video
- lxf->video_format = bytestream_get_le32(&p);
- ret = bytestream_get_le32(&p);
- //skip VBI data and metadata
- avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
- (int64_t)(uint32_t)AV_RL32(p + 12));
- break;
- case 1:
- //audio
- if (s->nb_streams < 2) {
- av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
- break;
- }
-
- if (version == 0)
- p += 8;
- audio_format = bytestream_get_le32(&p);
- channels = bytestream_get_le32(&p);
- track_size = bytestream_get_le32(&p);
-
- st = s->streams[1];
-
- //set codec based on specified audio bitdepth
- //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
- st->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F;
-
- if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) {
- av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n");
- return AVERROR_PATCHWELCOME;
- }
-
- switch (st->codec->bits_per_coded_sample) {
- case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
- case 20: st->codec->codec_id = AV_CODEC_ID_PCM_LXF; break;
- case 24: st->codec->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break;
- case 32: st->codec->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break;
- default:
- av_log(s, AV_LOG_WARNING,
- "only 16-, 20-, 24- and 32-bit PCM currently supported\n");
- return AVERROR_PATCHWELCOME;
- }
-
- samples = track_size * 8 / st->codec->bits_per_coded_sample;
-
- //use audio packet size to determine video standard
- //for NTSC we have one 8008-sample audio frame per five video frames
- if (samples == LXF_SAMPLERATE * 5005 / 30000) {
- avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
- } else {
- //assume PAL, but warn if we don't have 1920 samples
- if (samples != LXF_SAMPLERATE / 25)
- av_log(s, AV_LOG_WARNING,
- "video doesn't seem to be PAL or NTSC. guessing PAL\n");
-
- avpriv_set_pts_info(s->streams[0], 64, 1, 25);
- }
-
- //TODO: warning if track mask != (1 << channels) - 1?
- ret = av_popcount(channels) * track_size;
-
- break;
- default:
- tmp = bytestream_get_le32(&p);
- ret = bytestream_get_le32(&p);
- if (tmp == 1)
- lxf->extended_size = bytestream_get_le32(&p);
- break;
- }
-
- return ret;
-}
-
-static int lxf_read_header(AVFormatContext *s)
-{
- LXFDemuxContext *lxf = s->priv_data;
- AVIOContext *pb = s->pb;
- uint8_t header_data[LXF_HEADER_DATA_SIZE];
- int ret;
- AVStream *st;
- uint32_t video_params, disk_params;
- uint16_t record_date, expiration_date;
-
- if ((ret = get_packet_header(s)) < 0)
- return ret;
-
- if (ret != LXF_HEADER_DATA_SIZE) {
- av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
- LXF_HEADER_DATA_SIZE, ret);
- return AVERROR_INVALIDDATA;
- }
-
- if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
- return ret < 0 ? ret : AVERROR_EOF;
-
- if (!(st = avformat_new_stream(s, NULL)))
- return AVERROR(ENOMEM);
-
- st->duration = AV_RL32(&header_data[32]);
- video_params = AV_RL32(&header_data[40]);
- record_date = AV_RL16(&header_data[56]);
- expiration_date = AV_RL16(&header_data[58]);
- disk_params = AV_RL32(&header_data[116]);
-
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->bit_rate = 1000000 * ((video_params >> 14) & 0xFF);
- st->codec->codec_tag = video_params & 0xF;
- st->codec->codec_id = ff_codec_get_id(lxf_tags, st->codec->codec_tag);
- st->need_parsing = AVSTREAM_PARSE_HEADERS;
-
- av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
- record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
- (record_date >> 11) & 0x1F);
-
- av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
- expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
- (expiration_date >> 11) & 0x1F);
-
- if ((video_params >> 22) & 1)
- av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");
-
- if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) {
- if (!(st = avformat_new_stream(s, NULL)))
- return AVERROR(ENOMEM);
-
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->sample_rate = LXF_SAMPLERATE;
- st->codec->channels = lxf->channels;
-
- avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
- }
-
- avio_skip(s->pb, lxf->extended_size);
-
- return 0;
-}
-
-static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
- LXFDemuxContext *lxf = s->priv_data;
- AVIOContext *pb = s->pb;
- uint32_t stream;
- int ret, ret2;
-
- if ((ret = get_packet_header(s)) < 0)
- return ret;
-
- stream = lxf->packet_type;
-
- if (stream > 1) {
- av_log(s, AV_LOG_WARNING, "got packet with illegal stream index %u\n", stream);
- return AVERROR(EAGAIN);
- }
-
- if (stream == 1 && s->nb_streams < 2) {
- av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
- return AVERROR_INVALIDDATA;
- }
-
- if ((ret2 = av_new_packet(pkt, ret)) < 0)
- return ret2;
-
- if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) {
- av_free_packet(pkt);
- return ret2 < 0 ? ret2 : AVERROR_EOF;
- }
-
- pkt->stream_index = stream;
-
- if (!stream) {
- //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
- if (((lxf->video_format >> 22) & 0x3) < 2)
- pkt->flags |= AV_PKT_FLAG_KEY;
-
- pkt->dts = lxf->frame_number++;
- }
-
- return ret;
-}
-
-AVInputFormat ff_lxf_demuxer = {
- .name = "lxf",
- .long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
- .priv_data_size = sizeof(LXFDemuxContext),
- .read_probe = lxf_probe,
- .read_header = lxf_read_header,
- .read_packet = lxf_read_packet,
- .codec_tag = (const AVCodecTag* const []){lxf_tags, 0},
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 17:04:54 +0000