[FFmpeg-devel] [PATCH] IRCAM demuxer
Paul B Mahol
onemda at gmail.com
Mon Dec 3 14:07:54 CET 2012
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/ircamdec.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 144 insertions(+)
create mode 100644 libavformat/ircamdec.c
diff --git a/doc/general.texi b/doc/general.texi
index 5698106..f6c3d4d 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -235,6 +235,7 @@ library:
@tab A format generated by IndigoVision 8000 video server.
@item IVF (On2) @tab X @tab X
@tab A format used by libvpx
+ at item IRCAM @tab @tab X
@item LATM @tab X @tab X
@item LMLM4 @tab @tab X
@tab Used by Linux Media Labs MPEG-4 PCI boards
diff --git a/libavformat/Makefile b/libavformat/Makefile
index daa406f..1289097 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -143,6 +143,7 @@ OBJS-$(CONFIG_IMAGE2PIPE_DEMUXER) += img2dec.o img2.o
OBJS-$(CONFIG_IMAGE2PIPE_MUXER) += img2enc.o img2.o
OBJS-$(CONFIG_INGENIENT_DEMUXER) += ingenientdec.o rawdec.o
OBJS-$(CONFIG_IPMOVIE_DEMUXER) += ipmovie.o
+OBJS-$(CONFIG_IRCAM_DEMUXER) += ircamdec.o pcm.o
OBJS-$(CONFIG_ISS_DEMUXER) += iss.o
OBJS-$(CONFIG_IV8_DEMUXER) += iv8.o
OBJS-$(CONFIG_IVF_DEMUXER) += ivfdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 2987b8a..a282899 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -128,6 +128,7 @@ void av_register_all(void)
REGISTER_DEMUXER (INGENIENT, ingenient);
REGISTER_DEMUXER (IPMOVIE, ipmovie);
REGISTER_MUXER (IPOD, ipod);
+ REGISTER_DEMUXER (IRCAM, ircam);
REGISTER_MUXER (ISMV, ismv);
REGISTER_DEMUXER (ISS, iss);
REGISTER_DEMUXER (IV8, iv8);
diff --git a/libavformat/ircamdec.c b/libavformat/ircamdec.c
new file mode 100644
index 0000000..1e0488e
--- /dev/null
+++ b/libavformat/ircamdec.c
@@ -0,0 +1,141 @@
+/*
+ * 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 "avformat.h"
+#include "internal.h"
+#include "pcm.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))
+ return AVPROBE_SCORE_MAX;
+ return 0;
+}
+
+static const struct endianes {
+ 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, encoding;
+ 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;
+ }
+
+ if (!!le) {
+ sample_rate = av_int2float(avio_rl32(s->pb));
+ channels = avio_rl32(s->pb);
+ encoding = avio_rl32(s->pb);
+ } else if (!le) {
+ sample_rate = av_int2float(avio_rb32(s->pb));
+ channels = avio_rb32(s->pb);
+ encoding = avio_rb32(s->pb);
+ } else {
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (!channels || !encoding || !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;
+
+ switch (encoding) {
+ case 0x00001:
+ st->codec->codec_id = AV_CODEC_ID_PCM_S8;
+ break;
+ case 0x00002:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
+ break;
+ case 0x00003:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_S24LE : AV_CODEC_ID_PCM_S24BE;
+ break;
+ case 0x40004:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_S32LE : AV_CODEC_ID_PCM_S32BE;
+ break;
+ case 0x00004:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_F32LE : AV_CODEC_ID_PCM_F32BE;
+ break;
+ case 0x00008:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_F64LE : AV_CODEC_ID_PCM_F64BE;
+ break;
+ case 0x10001:
+ st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
+ break;
+ case 0x20001:
+ st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
+ break;
+ default:
+ 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;
+}
+
+static int ircam_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int ret;
+
+ ret = av_get_packet(s->pb, pkt, 1024 * s->streams[0]->codec->block_align);
+ pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
+ pkt->stream_index = 0;
+
+ return ret;
+}
+
+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 = ircam_read_packet,
+ .read_seek = ff_pcm_read_seek,
+ .extensions = "sf,ircam",
+ .flags = AVFMT_GENERIC_INDEX,
+};
--
1.7.11.4
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