split voc.c into vocdec.c and vocenc.c

Originally committed as revision 7145 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 170 insertions, 0 deletions

diff --git a/libavformat/vocdec.c b/libavformat/vocdec.c
new file mode 100644
index 0000000000..3a8bd28c52
--- /dev/null
+++ b/libavformat/vocdec.c
@@ -0,0 +1,170 @@
+/*
+ * Creative Voice File demuxer.
+ * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "avformat.h"
+#include "riff.h"    /* for CodecTag */
+#include "voc.h"
+
+
+static const int voc_max_pkt_size = 2048;
+static const unsigned char voc_magic[] = "Creative Voice File\x1A";
+
+static const CodecTag voc_codec_tags[] = {
+    {CODEC_ID_PCM_U8,        0x00},
+    {CODEC_ID_ADPCM_SBPRO_4, 0x01},
+    {CODEC_ID_ADPCM_SBPRO_3, 0x02},
+    {CODEC_ID_ADPCM_SBPRO_2, 0x03},
+    {CODEC_ID_PCM_S16LE,     0x04},
+    {CODEC_ID_PCM_ALAW,      0x06},
+    {CODEC_ID_PCM_MULAW,     0x07},
+    {CODEC_ID_ADPCM_CT,    0x0200},
+    {0, 0},
+};
+
+
+static int voc_probe(AVProbeData *p)
+{
+    int version, check;
+
+    if (p->buf_size < 26)
+        return 0;
+    if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
+        return 0;
+    version = p->buf[22] | (p->buf[23] << 8);
+    check = p->buf[24] | (p->buf[25] << 8);
+    if (~version + 0x1234 != check)
+        return 10;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    voc_dec_context_t *voc = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int header_size;
+    AVStream *st;
+
+    url_fskip(pb, 20);
+    header_size = get_le16(pb) - 22;
+    if (header_size != 4) {
+        av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
+        return AVERROR_NOTSUPP;
+    }
+    url_fskip(pb, header_size);
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+
+    voc->remaining_size = 0;
+    return 0;
+}
+
+int
+voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
+{
+    voc_dec_context_t *voc = s->priv_data;
+    AVCodecContext *dec = st->codec;
+    ByteIOContext *pb = &s->pb;
+    voc_type_t type;
+    int size;
+    int sample_rate = 0;
+    int channels = 1;
+
+    while (!voc->remaining_size) {
+        type = get_byte(pb);
+        if (type == VOC_TYPE_EOF)
+            return AVERROR_IO;
+        voc->remaining_size = get_le24(pb);
+        max_size -= 4;
+
+        switch (type) {
+        case VOC_TYPE_VOICE_DATA:
+            dec->sample_rate = 1000000 / (256 - get_byte(pb));
+            if (sample_rate)
+                dec->sample_rate = sample_rate;
+            dec->channels = channels;
+            dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
+            dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
+            voc->remaining_size -= 2;
+            max_size -= 2;
+            channels = 1;
+            break;
+
+        case VOC_TYPE_VOICE_DATA_CONT:
+            break;
+
+        case VOC_TYPE_EXTENDED:
+            sample_rate = get_le16(pb);
+            get_byte(pb);
+            channels = get_byte(pb) + 1;
+            sample_rate = 256000000 / (channels * (65536 - sample_rate));
+            voc->remaining_size = 0;
+            max_size -= 4;
+            break;
+
+        case VOC_TYPE_NEW_VOICE_DATA:
+            dec->sample_rate = get_le32(pb);
+            dec->bits_per_sample = get_byte(pb);
+            dec->channels = get_byte(pb);
+            dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
+            url_fskip(pb, 4);
+            voc->remaining_size -= 12;
+            max_size -= 12;
+            break;
+
+        default:
+            url_fskip(pb, voc->remaining_size);
+            max_size -= voc->remaining_size;
+            voc->remaining_size = 0;
+            break;
+        }
+    }
+
+    dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
+
+    if (max_size <= 0)
+        max_size = voc_max_pkt_size;
+    size = FFMIN(voc->remaining_size, max_size);
+    voc->remaining_size -= size;
+    return av_get_packet(pb, pkt, size);
+}
+
+static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    return voc_get_packet(s, pkt, s->streams[0], 0);
+}
+
+static int voc_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+AVInputFormat voc_demuxer = {
+    "voc",
+    "Creative Voice File format",
+    sizeof(voc_dec_context_t),
+    voc_probe,
+    voc_read_header,
+    voc_read_packet,
+    voc_read_close,
+};