| /* |
| * 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 "avformat.h" |
| #include "internal.h" |
| #include "riff.h" |
| |
| #define LXF_PACKET_HEADER_SIZE 60 |
| #define LXF_HEADER_DATA_SIZE 120 |
| #define LXF_IDENT "LEITCH\0" |
| #define LXF_IDENT_LENGTH 8 |
| #define LXF_SAMPLERATE 48000 |
| #define LXF_MAX_AUDIO_PACKET (8008*15*4) ///< 15-channel 32-bit NTSC audio frame |
| |
| static const AVCodecTag lxf_tags[] = { |
| { CODEC_ID_MJPEG, 0 }, |
| { CODEC_ID_MPEG1VIDEO, 1 }, |
| { CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0 |
| { CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2 |
| { CODEC_ID_DVVIDEO, 4 }, //DV25 |
| { CODEC_ID_DVVIDEO, 5 }, //DVCPRO |
| { CODEC_ID_DVVIDEO, 6 }, //DVCPRO50 |
| { CODEC_ID_RAWVIDEO, 7 }, //PIX_FMT_ARGB, where alpha is used for chroma keying |
| { CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key |
| { CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop") |
| { CODEC_ID_NONE, 0 }, |
| }; |
| |
| typedef struct { |
| int channels; ///< number of audio channels. zero means no audio |
| uint8_t temp[LXF_MAX_AUDIO_PACKET]; ///< temp buffer for de-planarizing the audio data |
| int frame_number; ///< current video frame |
| } 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 x; |
| uint32_t sum = 0; |
| |
| for (x = 0; x < LXF_PACKET_HEADER_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 |
| * |
| * @param[out] header the read packet header |
| * @param[out] format context dependent format information |
| * @return the size of the payload following the header or < 0 on failure |
| */ |
| static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *format) |
| { |
| AVIOContext *pb = s->pb; |
| int track_size, samples, ret; |
| AVStream *st; |
| |
| //find and read the ident |
| if ((ret = sync(s, header)) < 0) |
| return ret; |
| |
| //read the rest of the packet header |
| if ((ret = avio_read(pb, header + LXF_IDENT_LENGTH, |
| LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH)) != |
| LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH) { |
| return ret < 0 ? ret : AVERROR_EOF; |
| } |
| |
| if (check_checksum(header)) |
| av_log(s, AV_LOG_ERROR, "checksum error\n"); |
| |
| *format = AV_RL32(&header[32]); |
| ret = AV_RL32(&header[36]); |
| |
| //type |
| switch (AV_RL32(&header[16])) { |
| case 0: |
| //video |
| //skip VBI data and metadata |
| avio_skip(pb, (int64_t)(uint32_t)AV_RL32(&header[44]) + |
| (int64_t)(uint32_t)AV_RL32(&header[52])); |
| break; |
| case 1: |
| //audio |
| if (!(st = s->streams[1])) { |
| av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n"); |
| break; |
| } |
| |
| //set codec based on specified audio bitdepth |
| //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment |
| *format = AV_RL32(&header[40]); |
| st->codec->bits_per_coded_sample = (*format >> 6) & 0x3F; |
| |
| if (st->codec->bits_per_coded_sample != (*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 = CODEC_ID_PCM_S16LE; break; |
| case 20: st->codec->codec_id = CODEC_ID_PCM_LXF; break; |
| case 24: st->codec->codec_id = CODEC_ID_PCM_S24LE; break; |
| case 32: st->codec->codec_id = CODEC_ID_PCM_S32LE; break; |
| default: |
| av_log(s, AV_LOG_WARNING, |
| "only 16-, 20-, 24- and 32-bit PCM currently supported\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| track_size = AV_RL32(&header[48]); |
| 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(AV_RL32(&header[44])) * track_size; |
| |
| break; |
| default: |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int lxf_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| { |
| LXFDemuxContext *lxf = s->priv_data; |
| AVIOContext *pb = s->pb; |
| uint8_t header[LXF_PACKET_HEADER_SIZE], header_data[LXF_HEADER_DATA_SIZE]; |
| int ret; |
| AVStream *st; |
| uint32_t format, video_params, disk_params; |
| uint16_t record_date, expiration_date; |
| |
| if ((ret = get_packet_header(s, header, &format)) < 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); |
| |
| 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 = (disk_params >> 2) & 0xF)) { |
| 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); |
| } |
| |
| if (format == 1) { |
| //skip extended field data |
| avio_skip(s->pb, (uint32_t)AV_RL32(&header[40])); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * De-planerize the PCM data in lxf->temp |
| * FIXME: remove this once support for planar audio is added to libavcodec |
| * |
| * @param[out] out where to write the de-planerized data to |
| * @param[in] bytes the total size of the PCM data |
| */ |
| static void deplanarize(LXFDemuxContext *lxf, AVStream *ast, uint8_t *out, int bytes) |
| { |
| int x, y, z, i, bytes_per_sample = ast->codec->bits_per_coded_sample >> 3; |
| |
| for (z = i = 0; z < lxf->channels; z++) |
| for (y = 0; y < bytes / bytes_per_sample / lxf->channels; y++) |
| for (x = 0; x < bytes_per_sample; x++, i++) |
| out[x + bytes_per_sample*(z + y*lxf->channels)] = lxf->temp[i]; |
| } |
| |
| static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| LXFDemuxContext *lxf = s->priv_data; |
| AVIOContext *pb = s->pb; |
| uint8_t header[LXF_PACKET_HEADER_SIZE], *buf; |
| AVStream *ast = NULL; |
| uint32_t stream, format; |
| int ret, ret2; |
| |
| if ((ret = get_packet_header(s, header, &format)) < 0) |
| return ret; |
| |
| stream = AV_RL32(&header[16]); |
| |
| if (stream > 1) { |
| av_log(s, AV_LOG_WARNING, "got packet with illegal stream index %u\n", stream); |
| return AVERROR(EAGAIN); |
| } |
| |
| if (stream == 1 && !(ast = s->streams[1])) { |
| av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| //make sure the data fits in the de-planerization buffer |
| if (ast && ret > LXF_MAX_AUDIO_PACKET) { |
| av_log(s, AV_LOG_ERROR, "audio packet too large (%i > %i)\n", |
| ret, LXF_MAX_AUDIO_PACKET); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if ((ret2 = av_new_packet(pkt, ret)) < 0) |
| return ret2; |
| |
| //read non-20-bit audio data into lxf->temp so we can deplanarize it |
| buf = ast && ast->codec->codec_id != CODEC_ID_PCM_LXF ? lxf->temp : pkt->data; |
| |
| if ((ret2 = avio_read(pb, buf, ret)) != ret) { |
| av_free_packet(pkt); |
| return ret2 < 0 ? ret2 : AVERROR_EOF; |
| } |
| |
| pkt->stream_index = stream; |
| |
| if (ast) { |
| if(ast->codec->codec_id != CODEC_ID_PCM_LXF) |
| deplanarize(lxf, ast, pkt->data, ret); |
| } else { |
| //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B) |
| if (((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 format (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}, |
| }; |
| |
