IFF demuxer

Patch by Jai Menon (realityman <at> gmx.net)

Originally committed as revision 12633 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 174 insertions, 0 deletions

diff --git a/libavformat/iff.c b/libavformat/iff.c
new file mode 100644
index 0000000000..aafd626c02
--- /dev/null
+++ b/libavformat/iff.c
@@ -0,0 +1,174 @@
+/*
+ * Iff (.iff) File Demuxer
+ * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.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
+ */
+
+/**
+ * @file iff.c
+ * iff file demuxer
+ * by Jaikrishnan Menon
+ * for more information on the .iff file format, visit:
+ * http://wiki.multimedia.cx/index.php?title=IFF
+ */
+
+#include "avformat.h"
+
+#define ID_8SVX       MKTAG('8','S','V','X')
+#define ID_VHDR       MKTAG('V','H','D','R')
+#define ID_ATAK       MKTAG('A','T','A','K')
+#define ID_RLSE       MKTAG('R','L','S','E')
+#define ID_CHAN       MKTAG('C','H','A','N')
+
+#define ID_FORM       MKTAG('F','O','R','M')
+#define ID_ANNO       MKTAG('A','N','N','O')
+#define ID_AUTH       MKTAG('A','U','T','H')
+#define ID_CHRS       MKTAG('C','H','R','S')
+#define ID_COPYRIGHT  MKTAG('(','c',')',' ')
+#define ID_CSET       MKTAG('C','S','E','T')
+#define ID_FVER       MKTAG('F','V','E','R')
+#define ID_NAME       MKTAG('N','A','M','E')
+#define ID_TEXT       MKTAG('T','E','X','T')
+#define ID_BODY       MKTAG('B','O','D','Y')
+
+#define LEFT    2
+#define RIGHT   4
+#define STEREO  6
+
+#define PACKET_SIZE 1024
+
+typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_t;
+
+typedef struct {
+    uint32_t  body_size;
+    uint32_t  sent_bytes;
+    uint32_t  audio_frame_count;
+} IffDemuxContext;
+
+static int iff_probe(AVProbeData *p)
+{
+    const uint8_t *d = p->buf;
+
+    if ( AV_RL32(d)   == ID_FORM &&
+         AV_RL32(d+8) == ID_8SVX)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int iff_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    IffDemuxContext *iff = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVStream *st;
+    uint32_t chunk_id, data_size;
+    int padding, ret, done = 0;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+      return AVERROR(ENOMEM);
+
+    st->codec->channels = 1;
+    url_fskip(pb, 12);
+
+    while(!done && !url_feof(pb)) {
+        chunk_id = get_le32(pb);
+        data_size = get_be32(pb);
+        padding = data_size & 1;
+
+        switch(chunk_id) {
+        case ID_VHDR:
+            url_fskip(pb, 12);
+            st->codec->sample_rate = get_be16(pb);
+            url_fskip(pb, 1);
+            st->codec->codec_tag = get_byte(pb);
+            url_fskip(pb, 4);
+            break;
+
+        case ID_BODY:
+            iff->body_size = data_size;
+            done = 1;
+            break;
+
+        case ID_CHAN:
+            st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;
+            break;
+
+        default:
+            url_fseek(pb, data_size + padding, SEEK_CUR);
+            break;
+        }
+    }
+
+    if(!st->codec->sample_rate)
+        return AVERROR_INVALIDDATA;
+
+    av_set_pts_info(st, 32, 1, st->codec->sample_rate);
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+
+    switch(st->codec->codec_tag) {
+    case COMP_NONE:
+        st->codec->codec_id = CODEC_ID_PCM_S8;
+        break;
+    case COMP_FIB:
+        st->codec->codec_id = CODEC_ID_8SVX_FIB;
+        break;
+    case COMP_EXP:
+        st->codec->codec_id = CODEC_ID_8SVX_EXP;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");
+        return -1;
+    }
+
+    st->codec->bits_per_sample = 8;
+    st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_sample;
+    st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+
+    return 0;
+}
+
+static int iff_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    IffDemuxContext *iff = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    int ret;
+
+    if(iff->sent_bytes > iff->body_size)
+        return AVERROR(EIO);
+    ret = av_get_packet(pb, pkt, PACKET_SIZE);
+
+    if(iff->sent_bytes == 0)
+        pkt->flags |= PKT_FLAG_KEY;
+
+    iff->sent_bytes += PACKET_SIZE;
+    pkt->stream_index = 0;
+    pkt->pts = iff->audio_frame_count;
+    iff->audio_frame_count += ret / s->streams[0]->codec->channels;
+    return ret;
+}
+
+AVInputFormat iff_demuxer = {
+    "IFF",
+    "IFF format",
+    sizeof(IffDemuxContext),
+    iff_probe,
+    iff_read_header,
+    iff_read_packet,
+};