lavf: add OpenMG audio muxer.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 105 insertions, 0 deletions

diff --git a/libavformat/omaenc.c b/libavformat/omaenc.c
new file mode 100644
index 0000000000..e932b4bbc1
--- /dev/null
+++ b/libavformat/omaenc.c
@@ -0,0 +1,105 @@
+/*
+ * Sony OpenMG (OMA) muxer
+ *
+ * Copyright (c) 2011 Michael Karcher
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "avio_internal.h"
+#include "id3v2.h"
+#include "internal.h"
+#include "oma.h"
+#include "rawenc.h"
+
+static av_cold int oma_write_header(AVFormatContext *s)
+{
+    int i;
+    AVCodecContext *format;
+    int srate_index;
+    int isjointstereo;
+
+    format = s->streams[0]->codec;
+    /* check for support of the format first */
+
+    for (srate_index = 0; ; srate_index++) {
+        if (ff_oma_srate_tab[srate_index] == 0) {
+            av_log(s, AV_LOG_ERROR, "Sample rate %d not supported in OpenMG audio\n",
+                   format->sample_rate);
+            return AVERROR(EINVAL);
+        }
+
+        if (ff_oma_srate_tab[srate_index] * 100 == format->sample_rate)
+            break;
+    }
+
+    /* Metadata; OpenMG does not support ID3v2.4 */
+    ff_id3v2_write(s, 3, ID3v2_EA3_MAGIC);
+
+    ffio_wfourcc(s->pb, "EA3\0");
+    avio_w8(s->pb, EA3_HEADER_SIZE >> 7);
+    avio_w8(s->pb, EA3_HEADER_SIZE & 0x7F);
+    avio_wl16(s->pb, 0xFFFF);       /* not encrypted */
+    for (i = 0; i < 6; i++)
+        avio_wl32(s->pb, 0);        /* Padding + DRM id */
+
+    switch(format->codec_tag) {
+    case OMA_CODECID_ATRAC3:
+        if (format->channels != 2) {
+            av_log(s, AV_LOG_ERROR, "ATRAC3 in OMA is only supported with 2 channels");
+            return AVERROR(EINVAL);
+        }
+        if (format->extradata_size == 14) /* WAV format extradata */
+            isjointstereo = format->extradata[6] != 0;
+        else if(format->extradata_size == 10) /* RM format extradata */
+            isjointstereo = format->extradata[8] == 0x12;
+        else {
+            av_log(s, AV_LOG_ERROR, "ATRAC3: Unsupported extradata size\n");
+            return AVERROR(EINVAL);
+        }
+        avio_wb32(s->pb, (OMA_CODECID_ATRAC3 << 24) |
+                         (isjointstereo << 17) |
+                         (srate_index << 13) |
+                         (format->block_align/8));
+        break;
+    case OMA_CODECID_ATRAC3P:
+        avio_wb32(s->pb, (OMA_CODECID_ATRAC3P << 24) |
+                         (srate_index << 13) |
+                         (format->channels << 10) |
+                         (format->block_align/8 - 1));
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "OMA: unsupported codec tag %d for write\n",
+               format->codec_tag);
+    }
+    for (i = 0; i < (EA3_HEADER_SIZE - 36)/4; i++)
+        avio_wl32(s->pb, 0);        /* Padding */
+
+    return 0;
+}
+
+AVOutputFormat ff_oma_muxer = {
+    .name              = "oma",
+    .long_name         = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
+    .mime_type         = "audio/x-oma",
+    .extensions        = "oma",
+    .audio_codec       = CODEC_ID_ATRAC3,
+    .write_header      = oma_write_header,
+    .write_packet      = ff_raw_write_packet,
+    .codec_tag         = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
+};