| /* |
| * Wideband Single-bit Data (WSD) demuxer |
| * Copyright (c) 2014 Peter Ross |
| * |
| * 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 "libavutil/timecode.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "rawdec.h" |
| |
| static int wsd_probe(const AVProbeData *p) |
| { |
| if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) || |
| !AV_RB32(p->buf + 36) || !p->buf[44] || |
| (p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80))) |
| return 0; |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int empty_string(const char *buf, unsigned size) |
| { |
| while (size--) { |
| if (*buf++ != ' ') |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit) |
| { |
| switch (bit) { |
| case 2: return AV_CH_BACK_RIGHT; |
| case 3: |
| avpriv_request_sample(s, "Rr-middle"); |
| break; |
| case 4: return AV_CH_BACK_CENTER; |
| case 5: |
| avpriv_request_sample(s, "Lr-middle"); |
| break; |
| case 6: return AV_CH_BACK_LEFT; |
| case 24: return AV_CH_LOW_FREQUENCY; |
| case 26: return AV_CH_FRONT_RIGHT; |
| case 27: return AV_CH_FRONT_RIGHT_OF_CENTER; |
| case 28: return AV_CH_FRONT_CENTER; |
| case 29: return AV_CH_FRONT_LEFT_OF_CENTER; |
| case 30: return AV_CH_FRONT_LEFT; |
| default: |
| av_log(s, AV_LOG_WARNING, "reserved channel assignment\n"); |
| break; |
| } |
| return 0; |
| } |
| |
| static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size) |
| { |
| uint8_t *buf; |
| if (!(size + 1)) |
| return AVERROR(ENOMEM); |
| |
| buf = av_malloc(size + 1); |
| if (!buf) |
| return AVERROR(ENOMEM); |
| |
| if (avio_read(s->pb, buf, size) != size) { |
| av_free(buf); |
| return AVERROR(EIO); |
| } |
| |
| if (empty_string(buf, size)) { |
| av_free(buf); |
| return 0; |
| } |
| |
| buf[size] = 0; |
| av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL); |
| return 0; |
| } |
| |
| static int wsd_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| int version; |
| uint32_t text_offset, data_offset, channel_assign; |
| char playback_time[AV_TIMECODE_STR_SIZE]; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| avio_skip(pb, 8); |
| version = avio_r8(pb); |
| av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF); |
| avio_skip(pb, 11); |
| |
| if (version < 0x10) { |
| text_offset = 0x80; |
| data_offset = 0x800; |
| avio_skip(pb, 8); |
| } else { |
| text_offset = avio_rb32(pb); |
| data_offset = avio_rb32(pb); |
| } |
| |
| avio_skip(pb, 4); |
| av_timecode_make_smpte_tc_string2(playback_time, (AVRational){1,1}, avio_rb32(pb) & 0x00ffffffU, 1, 1); |
| av_dict_set(&s->metadata, "playback_time", playback_time, 0); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = s->iformat->raw_codec_id; |
| st->codecpar->sample_rate = avio_rb32(pb) / 8; |
| avio_skip(pb, 4); |
| st->codecpar->channels = avio_r8(pb) & 0xF; |
| st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * 8LL; |
| if (!st->codecpar->channels) |
| return AVERROR_INVALIDDATA; |
| |
| avio_skip(pb, 3); |
| channel_assign = avio_rb32(pb); |
| if (!(channel_assign & 1)) { |
| int i; |
| for (i = 1; i < 32; i++) |
| if ((channel_assign >> i) & 1) |
| st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i); |
| } |
| |
| avio_skip(pb, 16); |
| if (avio_rb32(pb)) |
| avpriv_request_sample(s, "emphasis"); |
| |
| if (avio_seek(pb, text_offset, SEEK_SET) >= 0) { |
| get_metadata(s, "title", 128); |
| get_metadata(s, "composer", 128); |
| get_metadata(s, "song_writer", 128); |
| get_metadata(s, "artist", 128); |
| get_metadata(s, "album", 128); |
| get_metadata(s, "genre", 32); |
| get_metadata(s, "date", 32); |
| get_metadata(s, "location", 32); |
| get_metadata(s, "comment", 512); |
| get_metadata(s, "user", 512); |
| } |
| |
| return avio_seek(pb, data_offset, SEEK_SET); |
| } |
| |
| FF_RAW_DEMUXER_CLASS(wsd) |
| AVInputFormat ff_wsd_demuxer = { |
| .name = "wsd", |
| .long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"), |
| .read_probe = wsd_probe, |
| .read_header = wsd_read_header, |
| .read_packet = ff_raw_read_partial_packet, |
| .extensions = "wsd", |
| .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK, |
| .raw_codec_id = AV_CODEC_ID_DSD_MSBF, |
| .priv_data_size = sizeof(FFRawDemuxerContext), |
| .priv_class = &wsd_demuxer_class, |
| }; |