From aafaeabb47416fdb264205086c0c272a926b95cb Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Sun, 12 Feb 2006 02:18:37 +0000
Subject: tta demuxer, also usable for moving tta audio data into an other
 container

Originally committed as revision 4997 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/tta.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 libavformat/tta.c

(limited to 'libavformat/tta.c')

diff --git a/libavformat/tta.c b/libavformat/tta.c
new file mode 100644
index 0000000000..6598dea314
--- /dev/null
+++ b/libavformat/tta.c
@@ -0,0 +1,138 @@
+/*
+ * TTA demuxer
+ * Copyright (c) 2006 Alex Beregszaszi
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+#define ALT_BITSREAM_READER_LE
+#include "bitstream.h"
+
+typedef struct {
+    int totalframes, currentframe;
+    uint32_t *seektable;
+} TTAContext;
+
+static int tta_probe(AVProbeData *p)
+{
+    const uint8_t *d = p->buf;
+    if (p->buf_size < 4)
+        return 0;
+    if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
+        return 80;
+    return 0;
+}
+
+static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    TTAContext *c = s->priv_data;
+    AVStream *st;
+    int i, channels, bps, samplerate, datalen, framelen, start;
+
+    start = url_ftell(&s->pb);
+
+    if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
+        return -1; // not tta file
+
+    url_fskip(&s->pb, 2); // FIXME: flags
+    channels = get_le16(&s->pb);
+    bps = get_le16(&s->pb);
+    samplerate = get_le32(&s->pb);
+    datalen = get_le32(&s->pb);
+    url_fskip(&s->pb, 4); // header crc
+
+    framelen = 1.04489795918367346939 * samplerate;
+    c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
+    c->currentframe = 0;
+
+    c->seektable = av_mallocz(sizeof(uint32_t)*c->totalframes);
+    if (!c->seektable)
+        return AVERROR_NOMEM;
+
+    for (i = 0; i < c->totalframes; i++)
+            c->seektable[i] = get_le32(&s->pb);
+    url_fskip(&s->pb, 4); // seektable crc
+
+    st = av_new_stream(s, 0);
+//    av_set_pts_info(st, 32, 1, 1000);
+    if (!st)
+        return AVERROR_NOMEM;
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+    st->codec->codec_id = CODEC_ID_TTA;
+    st->codec->channels = channels;
+    st->codec->sample_rate = samplerate;
+    st->codec->bits_per_sample = bps;
+
+    st->codec->extradata_size = url_ftell(&s->pb) - start;
+    st->codec->extradata = av_mallocz(st->codec->extradata_size);
+    url_fseek(&s->pb, start, SEEK_SET); // or SEEK_CUR and -size ? :)
+    get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
+
+    return 0;
+}
+
+static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    TTAContext *c = s->priv_data;
+    int ret, size;
+
+    // FIXME!
+    if (c->currentframe > c->totalframes)
+        size = 0;
+    else
+        size = c->seektable[c->currentframe];
+
+    c->currentframe++;
+
+    if (av_new_packet(pkt, size) < 0)
+        return AVERROR_IO;
+
+    pkt->pos = url_ftell(&s->pb);
+    pkt->stream_index = 0;
+    ret = get_buffer(&s->pb, pkt->data, size);
+    if (ret <= 0) {
+        av_free_packet(pkt);
+        return AVERROR_IO;
+    }
+    pkt->size = ret;
+//    av_log(s, AV_LOG_INFO, "TTA packet #%d desired size: %d read size: %d at pos %d\n",
+//        c->currentframe, size, ret, pkt->pos);
+    return 0; //ret;
+}
+
+static int tta_read_close(AVFormatContext *s)
+{
+    TTAContext *c = s->priv_data;
+    if (c->seektable)
+        av_free(c->seektable);
+    return 0;
+}
+
+AVInputFormat tta_iformat = {
+    "tta",
+    "true-audio",
+    sizeof(TTAContext),
+    tta_probe,
+    tta_read_header,
+    tta_read_packet,
+    tta_read_close,
+    .extensions = "tta",
+};
+
+int tta_init(void)
+{
+    av_register_input_format(&tta_iformat);
+    return 0;
+}
-- 
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