IRCAM demuxer & muxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>
2012-12-02 18:13:56 +00:00
parent 8ecf22ffb0
commit 880191637f
12 changed files with 267 additions and 1 deletions
--- a/libavformat/ircamdec.c
+++ b/libavformat/ircamdec.c
@ -0,0 +1,115 @@
+/*
+ * IRCAM demuxer
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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 "pcm.h"
+#include "ircam.h"
+
+static int ircam_probe(AVProbeData *p)
+{
+    if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
+         p->buf[2] >=    1 && p->buf[2] <= 4) ||
+        (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
+         p->buf[1] >=    1 && p->buf[1] <= 3) &&
+        AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
+        return AVPROBE_SCORE_MAX / 4 * 3;
+    return 0;
+}
+
+static const struct endianess {
+    uint32_t magic;
+    int      is_le;
+} table[] = {
+  { 0x64A30100, 0 },
+  { 0x64A30200, 1 },
+  { 0x64A30300, 0 },
+  { 0x64A30400, 1 },
+  { 0x0001A364, 1 },
+  { 0x0002A364, 0 },
+  { 0x0003A364, 1 },
+};
+
+static int ircam_read_header(AVFormatContext *s)
+{
+    uint32_t magic, sample_rate, channels, tag;
+    const AVCodecTag *tags;
+    int le = -1, i;
+    AVStream *st;
+
+    magic = avio_rl32(s->pb);
+    for (i = 0; i < 7; i++) {
+        if (magic == table[i].magic) {
+            le = table[i].is_le;
+            break;
+        }
+    }
+
+    if (le == 1) {
+        sample_rate = av_int2float(avio_rl32(s->pb));
+        channels    = avio_rl32(s->pb);
+        tag         = avio_rl32(s->pb);
+        tags        = ff_codec_ircam_le_tags;
+    } else if (le == 0) {
+        sample_rate = av_int2float(avio_rb32(s->pb));
+        channels    = avio_rb32(s->pb);
+        tag         = avio_rb32(s->pb);
+        tags        = ff_codec_ircam_be_tags;
+    } else {
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (!channels || !sample_rate)
+        return AVERROR_INVALIDDATA;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->channels    = channels;
+    st->codec->sample_rate = sample_rate;
+
+    st->codec->codec_id = ff_codec_get_id(tags, tag);
+    if (st->codec->codec_id == AV_CODEC_ID_NONE) {
+        av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
+        return AVERROR_INVALIDDATA;
+    }
+
+    st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
+    st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    avio_skip(s->pb, 1008);
+
+    return 0;
+}
+
+AVInputFormat ff_ircam_demuxer = {
+    .name           = "ircam",
+    .long_name      = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
+    .read_probe     = ircam_probe,
+    .read_header    = ircam_read_header,
+    .read_packet    = ff_pcm_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+    .extensions     = "sf,ircam",
+    .flags          = AVFMT_GENERIC_INDEX,
+};