yading@11: /* yading@11: * LXF demuxer yading@11: * Copyright (c) 2010 Tomas Härdin yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "libavutil/intreadwrite.h" yading@11: #include "libavcodec/bytestream.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: yading@11: #define LXF_MAX_PACKET_HEADER_SIZE 256 yading@11: #define LXF_HEADER_DATA_SIZE 120 yading@11: #define LXF_IDENT "LEITCH\0" yading@11: #define LXF_IDENT_LENGTH 8 yading@11: #define LXF_SAMPLERATE 48000 yading@11: #define LXF_MAX_AUDIO_PACKET (8008*15*4) ///< 15-channel 32-bit NTSC audio frame yading@11: yading@11: static const AVCodecTag lxf_tags[] = { yading@11: { AV_CODEC_ID_MJPEG, 0 }, yading@11: { AV_CODEC_ID_MPEG1VIDEO, 1 }, yading@11: { AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0 yading@11: { AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2 yading@11: { AV_CODEC_ID_DVVIDEO, 4 }, //DV25 yading@11: { AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO yading@11: { AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50 yading@11: { AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying yading@11: { AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key yading@11: { AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop") yading@11: { AV_CODEC_ID_NONE, 0 }, yading@11: }; yading@11: yading@11: typedef struct { yading@11: int channels; ///< number of audio channels. zero means no audio yading@11: int frame_number; ///< current video frame yading@11: uint32_t video_format, packet_type, extended_size; yading@11: } LXFDemuxContext; yading@11: yading@11: static int lxf_probe(AVProbeData *p) yading@11: { yading@11: if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH)) yading@11: return AVPROBE_SCORE_MAX; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: /** yading@11: * Verify the checksum of an LXF packet header yading@11: * yading@11: * @param[in] header the packet header to check yading@11: * @return zero if the checksum is OK, non-zero otherwise yading@11: */ yading@11: static int check_checksum(const uint8_t *header, int size) yading@11: { yading@11: int x; yading@11: uint32_t sum = 0; yading@11: yading@11: for (x = 0; x < size; x += 4) yading@11: sum += AV_RL32(&header[x]); yading@11: yading@11: return sum; yading@11: } yading@11: yading@11: /** yading@11: * Read input until we find the next ident. If found, copy it to the header buffer yading@11: * yading@11: * @param[out] header where to copy the ident to yading@11: * @return 0 if an ident was found, < 0 on I/O error yading@11: */ yading@11: static int sync(AVFormatContext *s, uint8_t *header) yading@11: { yading@11: uint8_t buf[LXF_IDENT_LENGTH]; yading@11: int ret; yading@11: yading@11: if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH) yading@11: return ret < 0 ? ret : AVERROR_EOF; yading@11: yading@11: while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) { yading@11: if (url_feof(s->pb)) yading@11: return AVERROR_EOF; yading@11: yading@11: memmove(buf, &buf[1], LXF_IDENT_LENGTH-1); yading@11: buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb); yading@11: } yading@11: yading@11: memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: /** yading@11: * Read and checksum the next packet header yading@11: * yading@11: * @return the size of the payload following the header or < 0 on failure yading@11: */ yading@11: static int get_packet_header(AVFormatContext *s) yading@11: { yading@11: LXFDemuxContext *lxf = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: int track_size, samples, ret; yading@11: uint32_t version, audio_format, header_size, channels, tmp; yading@11: AVStream *st; yading@11: uint8_t header[LXF_MAX_PACKET_HEADER_SIZE]; yading@11: const uint8_t *p; yading@11: yading@11: //find and read the ident yading@11: if ((ret = sync(s, header)) < 0) yading@11: return ret; yading@11: yading@11: ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8); yading@11: if (ret != 8) yading@11: return ret < 0 ? ret : AVERROR_EOF; yading@11: yading@11: p = header + LXF_IDENT_LENGTH; yading@11: version = bytestream_get_le32(&p); yading@11: header_size = bytestream_get_le32(&p); yading@11: if (version > 1) yading@11: avpriv_request_sample(s, "format version %i", version); yading@11: if (header_size < (version ? 72 : 60) || yading@11: header_size > LXF_MAX_PACKET_HEADER_SIZE || yading@11: (header_size & 3)) { yading@11: av_log(s, AV_LOG_ERROR, "Invalid header size 0x%x\n", header_size); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: //read the rest of the packet header yading@11: if ((ret = avio_read(pb, header + (p - header), yading@11: header_size - (p - header))) != yading@11: header_size - (p - header)) { yading@11: return ret < 0 ? ret : AVERROR_EOF; yading@11: } yading@11: yading@11: if (check_checksum(header, header_size)) yading@11: av_log(s, AV_LOG_ERROR, "checksum error\n"); yading@11: yading@11: lxf->packet_type = bytestream_get_le32(&p); yading@11: p += version ? 20 : 12; yading@11: yading@11: lxf->extended_size = 0; yading@11: switch (lxf->packet_type) { yading@11: case 0: yading@11: //video yading@11: lxf->video_format = bytestream_get_le32(&p); yading@11: ret = bytestream_get_le32(&p); yading@11: //skip VBI data and metadata yading@11: avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) + yading@11: (int64_t)(uint32_t)AV_RL32(p + 12)); yading@11: break; yading@11: case 1: yading@11: //audio yading@11: if (!s->streams || !(st = s->streams[1])) { yading@11: av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n"); yading@11: break; yading@11: } yading@11: yading@11: if (version == 0) p += 8; yading@11: audio_format = bytestream_get_le32(&p); yading@11: channels = bytestream_get_le32(&p); yading@11: track_size = bytestream_get_le32(&p); yading@11: yading@11: //set codec based on specified audio bitdepth yading@11: //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment yading@11: st->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F; yading@11: yading@11: if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) { yading@11: av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n"); yading@11: return AVERROR_PATCHWELCOME; yading@11: } yading@11: yading@11: switch (st->codec->bits_per_coded_sample) { yading@11: case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break; yading@11: case 20: st->codec->codec_id = AV_CODEC_ID_PCM_LXF; break; yading@11: case 24: st->codec->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break; yading@11: case 32: st->codec->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break; yading@11: default: yading@11: av_log(s, AV_LOG_WARNING, yading@11: "only 16-, 20-, 24- and 32-bit PCM currently supported\n"); yading@11: return AVERROR_PATCHWELCOME; yading@11: } yading@11: yading@11: samples = track_size * 8 / st->codec->bits_per_coded_sample; yading@11: yading@11: //use audio packet size to determine video standard yading@11: //for NTSC we have one 8008-sample audio frame per five video frames yading@11: if (samples == LXF_SAMPLERATE * 5005 / 30000) { yading@11: avpriv_set_pts_info(s->streams[0], 64, 1001, 30000); yading@11: } else { yading@11: //assume PAL, but warn if we don't have 1920 samples yading@11: if (samples != LXF_SAMPLERATE / 25) yading@11: av_log(s, AV_LOG_WARNING, yading@11: "video doesn't seem to be PAL or NTSC. guessing PAL\n"); yading@11: yading@11: avpriv_set_pts_info(s->streams[0], 64, 1, 25); yading@11: } yading@11: yading@11: //TODO: warning if track mask != (1 << channels) - 1? yading@11: ret = av_popcount(channels) * track_size; yading@11: yading@11: break; yading@11: default: yading@11: tmp = bytestream_get_le32(&p); yading@11: ret = bytestream_get_le32(&p); yading@11: if (tmp == 1) yading@11: lxf->extended_size = bytestream_get_le32(&p); yading@11: break; yading@11: } yading@11: yading@11: return ret; yading@11: } yading@11: yading@11: static int lxf_read_header(AVFormatContext *s) yading@11: { yading@11: LXFDemuxContext *lxf = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: uint8_t header_data[LXF_HEADER_DATA_SIZE]; yading@11: int ret; yading@11: AVStream *st; yading@11: uint32_t video_params, disk_params; yading@11: uint16_t record_date, expiration_date; yading@11: yading@11: if ((ret = get_packet_header(s)) < 0) yading@11: return ret; yading@11: yading@11: if (ret != LXF_HEADER_DATA_SIZE) { yading@11: av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n", yading@11: LXF_HEADER_DATA_SIZE, ret); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE) yading@11: return ret < 0 ? ret : AVERROR_EOF; yading@11: yading@11: if (!(st = avformat_new_stream(s, NULL))) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: st->duration = AV_RL32(&header_data[32]); yading@11: video_params = AV_RL32(&header_data[40]); yading@11: record_date = AV_RL16(&header_data[56]); yading@11: expiration_date = AV_RL16(&header_data[58]); yading@11: disk_params = AV_RL32(&header_data[116]); yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_VIDEO; yading@11: st->codec->bit_rate = 1000000 * ((video_params >> 14) & 0xFF); yading@11: st->codec->codec_tag = video_params & 0xF; yading@11: st->codec->codec_id = ff_codec_get_id(lxf_tags, st->codec->codec_tag); yading@11: yading@11: av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n", yading@11: record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF, yading@11: (record_date >> 11) & 0x1F); yading@11: yading@11: av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n", yading@11: expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF, yading@11: (expiration_date >> 11) & 0x1F); yading@11: yading@11: if ((video_params >> 22) & 1) yading@11: av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n"); yading@11: yading@11: if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) { yading@11: if (!(st = avformat_new_stream(s, NULL))) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: st->codec->sample_rate = LXF_SAMPLERATE; yading@11: st->codec->channels = lxf->channels; yading@11: yading@11: avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); yading@11: } yading@11: yading@11: avio_skip(s->pb, lxf->extended_size); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: LXFDemuxContext *lxf = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: AVStream *ast = NULL; yading@11: uint32_t stream; yading@11: int ret, ret2; yading@11: yading@11: if ((ret = get_packet_header(s)) < 0) yading@11: return ret; yading@11: yading@11: stream = lxf->packet_type; yading@11: yading@11: if (stream > 1) { yading@11: av_log(s, AV_LOG_WARNING, "got packet with illegal stream index %u\n", stream); yading@11: return AVERROR(EAGAIN); yading@11: } yading@11: yading@11: if (stream == 1 && !(ast = s->streams[1])) { yading@11: av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n"); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: //make sure the data fits in the de-planerization buffer yading@11: if (ast && ret > LXF_MAX_AUDIO_PACKET) { yading@11: av_log(s, AV_LOG_ERROR, "audio packet too large (%i > %i)\n", yading@11: ret, LXF_MAX_AUDIO_PACKET); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: if ((ret2 = av_new_packet(pkt, ret)) < 0) yading@11: return ret2; yading@11: yading@11: if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) { yading@11: av_free_packet(pkt); yading@11: return ret2 < 0 ? ret2 : AVERROR_EOF; yading@11: } yading@11: yading@11: pkt->stream_index = stream; yading@11: yading@11: if (!ast) { yading@11: //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B) yading@11: if (((lxf->video_format >> 22) & 0x3) < 2) yading@11: pkt->flags |= AV_PKT_FLAG_KEY; yading@11: yading@11: pkt->dts = lxf->frame_number++; yading@11: } yading@11: yading@11: return ret; yading@11: } yading@11: yading@11: AVInputFormat ff_lxf_demuxer = { yading@11: .name = "lxf", yading@11: .long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"), yading@11: .priv_data_size = sizeof(LXFDemuxContext), yading@11: .read_probe = lxf_probe, yading@11: .read_header = lxf_read_header, yading@11: .read_packet = lxf_read_packet, yading@11: .codec_tag = (const AVCodecTag* const []){lxf_tags, 0}, yading@11: };