344 lines
11 KiB
C
344 lines
11 KiB
C
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/*
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* LXF demuxer
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* Copyright (c) 2010 Tomas Härdin
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "internal.h"
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#define LXF_MAX_PACKET_HEADER_SIZE 256
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#define LXF_HEADER_DATA_SIZE 120
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#define LXF_IDENT "LEITCH\0"
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#define LXF_IDENT_LENGTH 8
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#define LXF_SAMPLERATE 48000
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static const AVCodecTag lxf_tags[] = {
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{ AV_CODEC_ID_MJPEG, 0 },
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{ AV_CODEC_ID_MPEG1VIDEO, 1 },
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{ AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0
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{ AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2
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{ AV_CODEC_ID_DVVIDEO, 4 }, //DV25
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{ AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO
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{ AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50
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{ AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying
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{ AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key
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{ AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop")
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{ AV_CODEC_ID_NONE, 0 },
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};
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typedef struct LXFDemuxContext {
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int channels; ///< number of audio channels. zero means no audio
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int frame_number; ///< current video frame
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uint32_t video_format, packet_type, extended_size;
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} LXFDemuxContext;
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static int lxf_probe(const AVProbeData *p)
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{
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if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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/**
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* Verify the checksum of an LXF packet header
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*
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* @param[in] header the packet header to check
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* @return zero if the checksum is OK, non-zero otherwise
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*/
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static int check_checksum(const uint8_t *header, int size)
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{
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int x;
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uint32_t sum = 0;
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for (x = 0; x < size; x += 4)
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sum += AV_RL32(&header[x]);
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return sum;
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}
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/**
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* Read input until we find the next ident. If found, copy it to the header buffer
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*
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* @param[out] header where to copy the ident to
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* @return 0 if an ident was found, < 0 on I/O error
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*/
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static int lxf_sync(AVFormatContext *s, uint8_t *header)
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{
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uint8_t buf[LXF_IDENT_LENGTH];
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int ret;
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if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
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return ret < 0 ? ret : AVERROR_EOF;
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while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
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buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
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}
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memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH);
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return 0;
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}
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/**
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* Read and checksum the next packet header
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*
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* @return the size of the payload following the header or < 0 on failure
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*/
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static int get_packet_header(AVFormatContext *s)
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{
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LXFDemuxContext *lxf = s->priv_data;
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AVIOContext *pb = s->pb;
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int track_size, samples, ret;
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uint32_t version, audio_format, header_size, channels, tmp;
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AVStream *st;
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uint8_t header[LXF_MAX_PACKET_HEADER_SIZE];
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const uint8_t *p = header + LXF_IDENT_LENGTH;
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//find and read the ident
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if ((ret = lxf_sync(s, header)) < 0)
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return ret;
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ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
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if (ret != 8)
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return ret < 0 ? ret : AVERROR_EOF;
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version = bytestream_get_le32(&p);
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header_size = bytestream_get_le32(&p);
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if (version > 1)
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avpriv_request_sample(s, "Format version %"PRIu32, version);
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if (header_size < (version ? 72 : 60) ||
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header_size > LXF_MAX_PACKET_HEADER_SIZE ||
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(header_size & 3)) {
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av_log(s, AV_LOG_ERROR, "Invalid header size 0x%"PRIx32"\n", header_size);
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return AVERROR_INVALIDDATA;
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}
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//read the rest of the packet header
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if ((ret = avio_read(pb, header + (p - header),
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header_size - (p - header))) !=
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header_size - (p - header))
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return ret < 0 ? ret : AVERROR_EOF;
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if (check_checksum(header, header_size))
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av_log(s, AV_LOG_ERROR, "checksum error\n");
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lxf->packet_type = bytestream_get_le32(&p);
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p += version ? 20 : 12;
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lxf->extended_size = 0;
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switch (lxf->packet_type) {
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case 0:
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//video
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lxf->video_format = bytestream_get_le32(&p);
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ret = bytestream_get_le32(&p);
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//skip VBI data and metadata
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avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
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(int64_t)(uint32_t)AV_RL32(p + 12));
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break;
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case 1:
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//audio
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if (s->nb_streams < 2) {
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av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
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break;
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}
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if (version == 0)
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p += 8;
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audio_format = bytestream_get_le32(&p);
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channels = bytestream_get_le32(&p);
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track_size = bytestream_get_le32(&p);
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st = s->streams[1];
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//set codec based on specified audio bitdepth
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//we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
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st->codecpar->bits_per_coded_sample = (audio_format >> 6) & 0x3F;
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if (st->codecpar->bits_per_coded_sample != (audio_format & 0x3F)) {
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avpriv_report_missing_feature(s, "Not tightly packed PCM");
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return AVERROR_PATCHWELCOME;
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}
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switch (st->codecpar->bits_per_coded_sample) {
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case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
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case 20: st->codecpar->codec_id = AV_CODEC_ID_PCM_LXF; break;
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case 24: st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break;
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case 32: st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break;
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default:
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avpriv_report_missing_feature(s, "PCM not 16-, 20-, 24- or 32-bits");
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return AVERROR_PATCHWELCOME;
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}
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samples = track_size * 8 / st->codecpar->bits_per_coded_sample;
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//use audio packet size to determine video standard
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//for NTSC we have one 8008-sample audio frame per five video frames
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if (samples == LXF_SAMPLERATE * 5005 / 30000) {
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avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
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} else {
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//assume PAL, but warn if we don't have 1920 samples
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if (samples != LXF_SAMPLERATE / 25)
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av_log(s, AV_LOG_WARNING,
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"video doesn't seem to be PAL or NTSC. guessing PAL\n");
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avpriv_set_pts_info(s->streams[0], 64, 1, 25);
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}
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//TODO: warning if track mask != (1 << channels) - 1?
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ret = av_popcount(channels) * track_size;
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break;
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default:
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tmp = bytestream_get_le32(&p);
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ret = bytestream_get_le32(&p);
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if (tmp == 1)
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lxf->extended_size = bytestream_get_le32(&p);
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break;
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}
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return ret;
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}
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static int lxf_read_header(AVFormatContext *s)
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{
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LXFDemuxContext *lxf = s->priv_data;
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AVIOContext *pb = s->pb;
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uint8_t header_data[LXF_HEADER_DATA_SIZE];
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int ret;
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AVStream *st;
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uint32_t video_params, disk_params;
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uint16_t record_date, expiration_date;
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if ((ret = get_packet_header(s)) < 0)
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return ret;
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if (ret != LXF_HEADER_DATA_SIZE) {
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av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
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LXF_HEADER_DATA_SIZE, ret);
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return AVERROR_INVALIDDATA;
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}
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if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
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return ret < 0 ? ret : AVERROR_EOF;
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if (!(st = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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st->duration = AV_RL32(&header_data[32]);
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video_params = AV_RL32(&header_data[40]);
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record_date = AV_RL16(&header_data[56]);
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expiration_date = AV_RL16(&header_data[58]);
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disk_params = AV_RL32(&header_data[116]);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->bit_rate = 1000000 * ((video_params >> 14) & 0xFF);
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st->codecpar->codec_tag = video_params & 0xF;
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st->codecpar->codec_id = ff_codec_get_id(lxf_tags, st->codecpar->codec_tag);
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st->need_parsing = AVSTREAM_PARSE_HEADERS;
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av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
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record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
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(record_date >> 11) & 0x1F);
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av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
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expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
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(expiration_date >> 11) & 0x1F);
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if ((video_params >> 22) & 1)
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av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");
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if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) {
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if (!(st = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->sample_rate = LXF_SAMPLERATE;
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st->codecpar->channels = lxf->channels;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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}
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avio_skip(s->pb, lxf->extended_size);
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return 0;
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}
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static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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LXFDemuxContext *lxf = s->priv_data;
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AVIOContext *pb = s->pb;
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uint32_t stream;
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int ret, ret2;
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if ((ret = get_packet_header(s)) < 0)
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return ret;
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stream = lxf->packet_type;
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if (stream > 1) {
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av_log(s, AV_LOG_WARNING,
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"got packet with illegal stream index %"PRIu32"\n", stream);
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return FFERROR_REDO;
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}
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if (stream == 1 && s->nb_streams < 2) {
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av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret2 = av_new_packet(pkt, ret)) < 0)
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return ret2;
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if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) {
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return ret2 < 0 ? ret2 : AVERROR_EOF;
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}
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pkt->stream_index = stream;
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if (!stream) {
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//picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
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if (((lxf->video_format >> 22) & 0x3) < 2)
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->dts = lxf->frame_number++;
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}
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return ret;
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}
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AVInputFormat ff_lxf_demuxer = {
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.name = "lxf",
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.long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
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.priv_data_size = sizeof(LXFDemuxContext),
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.read_probe = lxf_probe,
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.read_header = lxf_read_header,
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.read_packet = lxf_read_packet,
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.codec_tag = (const AVCodecTag* const []){lxf_tags, 0},
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};
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