avformat: add Wideband Single-bit Data (WSD) demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 172 insertions, 0 deletions

diff --git a/libavformat/wsddec.c b/libavformat/wsddec.c
new file mode 100644
index 0000000000..e84d093c65
--- /dev/null
+++ b/libavformat/wsddec.c
@@ -0,0 +1,172 @@
+/*
+ * 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(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_string(playback_time, avio_rb32(pb), 0);
+    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;
+    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 & (1 << i))
+                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);
+}
+
+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,
+};