Implement SoX native format muxer and demuxer.

Patch by Daniel Verkamp $firstname@drv DOT nu.

Originally committed as revision 18998 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 126 insertions, 0 deletions

diff --git a/libavformat/soxenc.c b/libavformat/soxenc.c
new file mode 100644
index 0000000000..1a04b2b661
--- /dev/null
+++ b/libavformat/soxenc.c
@@ -0,0 +1,126 @@
+/*
+ * SoX native format muxer
+ * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
+ *
+ * Based on libSoX sox-fmt.c
+ * Copyright (c) 2008 robs@users.sourceforge.net
+ *
+ * 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
+ */
+
+/**
+ * SoX native format muxer
+ * @file libavformat/soxenc.c
+ * @author Daniel Verkamp
+ * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "sox.h"
+
+typedef struct {
+    int64_t header_size;
+} SoXContext;
+
+static int sox_write_header(AVFormatContext *s)
+{
+    SoXContext *sox = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+    AVMetadataTag *comment;
+    size_t comment_len = 0, comment_size;
+
+    comment = av_metadata_get(s->metadata, "comment", NULL, 0);
+    if (comment)
+        comment_len = strlen(comment->value);
+    comment_size = (comment_len + 7) & ~7;
+
+    sox->header_size = SOX_FIXED_HDR + comment_size;
+
+    if (enc->codec_id == CODEC_ID_PCM_S32LE) {
+        put_tag(pb, ".SoX");
+        put_le32(pb, sox->header_size);
+        put_le64(pb, 0); /* number of samples */
+        put_le64(pb, av_dbl2int(enc->sample_rate));
+        put_le32(pb, enc->channels);
+        put_le32(pb, comment_size);
+    } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
+        put_tag(pb, "XoS.");
+        put_be32(pb, sox->header_size);
+        put_be64(pb, 0); /* number of samples */
+        put_be64(pb, av_dbl2int(enc->sample_rate));
+        put_be32(pb, enc->channels);
+        put_be32(pb, comment_size);
+    } else {
+        av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
+        return -1;
+    }
+
+    if (comment_len)
+        put_buffer(pb, comment->value, comment_len);
+
+    for ( ; comment_size > comment_len; comment_len++)
+        put_byte(pb, 0);
+
+    put_flush_packet(pb);
+
+    return 0;
+}
+
+static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ByteIOContext *pb = s->pb;
+    put_buffer(pb, pkt->data, pkt->size);
+    return 0;
+}
+
+static int sox_write_trailer(AVFormatContext *s)
+{
+    SoXContext *sox = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    if (!url_is_streamed(s->pb)) {
+        /* update number of samples */
+        int64_t file_size = url_ftell(pb);
+        int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
+        url_fseek(pb, 8, SEEK_SET);
+        if (enc->codec_id == CODEC_ID_PCM_S32LE) {
+            put_le64(pb, num_samples);
+        } else
+            put_be64(pb, num_samples);
+        url_fseek(pb, file_size, SEEK_SET);
+
+        put_flush_packet(pb);
+    }
+
+    return 0;
+}
+
+AVOutputFormat sox_muxer = {
+    "sox",
+    NULL_IF_CONFIG_SMALL("SoX native format"),
+    NULL,
+    "sox",
+    sizeof(SoXContext),
+    CODEC_ID_PCM_S32LE,
+    CODEC_ID_NONE,
+    sox_write_header,
+    sox_write_packet,
+    sox_write_trailer,
+};