2016-04-29 16:48:45 +00:00
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/*
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* Wideband Single-bit Data (WSD) demuxer
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* Copyright (c) 2014 Peter Ross
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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 "libavutil/intreadwrite.h"
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#include "libavutil/timecode.h"
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#include "avformat.h"
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#include "internal.h"
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#include "rawdec.h"
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2019-03-21 00:18:37 +00:00
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static int wsd_probe(const AVProbeData *p)
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2016-04-29 16:48:45 +00:00
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{
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if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) ||
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!AV_RB32(p->buf + 36) || !p->buf[44] ||
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(p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80)))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int empty_string(const char *buf, unsigned size)
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{
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while (size--) {
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if (*buf++ != ' ')
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return 0;
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}
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return 1;
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}
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static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
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{
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switch (bit) {
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case 2: return AV_CH_BACK_RIGHT;
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case 3:
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avpriv_request_sample(s, "Rr-middle");
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break;
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case 4: return AV_CH_BACK_CENTER;
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case 5:
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avpriv_request_sample(s, "Lr-middle");
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break;
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case 6: return AV_CH_BACK_LEFT;
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case 24: return AV_CH_LOW_FREQUENCY;
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case 26: return AV_CH_FRONT_RIGHT;
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case 27: return AV_CH_FRONT_RIGHT_OF_CENTER;
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case 28: return AV_CH_FRONT_CENTER;
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case 29: return AV_CH_FRONT_LEFT_OF_CENTER;
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case 30: return AV_CH_FRONT_LEFT;
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default:
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av_log(s, AV_LOG_WARNING, "reserved channel assignment\n");
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break;
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}
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return 0;
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}
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static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
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{
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uint8_t *buf;
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if (!(size + 1))
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return AVERROR(ENOMEM);
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buf = av_malloc(size + 1);
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if (!buf)
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return AVERROR(ENOMEM);
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if (avio_read(s->pb, buf, size) != size) {
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av_free(buf);
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return AVERROR(EIO);
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}
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if (empty_string(buf, size)) {
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av_free(buf);
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return 0;
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}
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buf[size] = 0;
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av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
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return 0;
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}
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static int wsd_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVStream *st;
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int version;
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uint32_t text_offset, data_offset, channel_assign;
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char playback_time[AV_TIMECODE_STR_SIZE];
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(pb, 8);
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version = avio_r8(pb);
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av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF);
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avio_skip(pb, 11);
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if (version < 0x10) {
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text_offset = 0x80;
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data_offset = 0x800;
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avio_skip(pb, 8);
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} else {
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text_offset = avio_rb32(pb);
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data_offset = avio_rb32(pb);
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}
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avio_skip(pb, 4);
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av_timecode_make_smpte_tc_string(playback_time, avio_rb32(pb), 0);
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av_dict_set(&s->metadata, "playback_time", playback_time, 0);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = s->iformat->raw_codec_id;
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st->codecpar->sample_rate = avio_rb32(pb) / 8;
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avio_skip(pb, 4);
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st->codecpar->channels = avio_r8(pb) & 0xF;
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2016-12-12 23:38:25 +00:00
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st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * 8LL;
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2016-04-29 16:48:45 +00:00
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if (!st->codecpar->channels)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 3);
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channel_assign = avio_rb32(pb);
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if (!(channel_assign & 1)) {
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int i;
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for (i = 1; i < 32; i++)
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2019-06-08 07:27:49 +00:00
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if ((channel_assign >> i) & 1)
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2016-04-29 16:48:45 +00:00
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st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i);
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}
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avio_skip(pb, 16);
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if (avio_rb32(pb))
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avpriv_request_sample(s, "emphasis");
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if (avio_seek(pb, text_offset, SEEK_SET) >= 0) {
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get_metadata(s, "title", 128);
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get_metadata(s, "composer", 128);
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get_metadata(s, "song_writer", 128);
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get_metadata(s, "artist", 128);
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get_metadata(s, "album", 128);
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get_metadata(s, "genre", 32);
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get_metadata(s, "date", 32);
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get_metadata(s, "location", 32);
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get_metadata(s, "comment", 512);
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get_metadata(s, "user", 512);
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}
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return avio_seek(pb, data_offset, SEEK_SET);
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}
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AVInputFormat ff_wsd_demuxer = {
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.name = "wsd",
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.long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
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.read_probe = wsd_probe,
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.read_header = wsd_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.extensions = "wsd",
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
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.raw_codec_id = AV_CODEC_ID_DSD_MSBF,
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};
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