1 files changed, 149 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/tta.c b/contrib/ffmpeg/libavformat/tta.c
new file mode 100644
index 000000000..2cd0101f1
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/tta.c
@@ -0,0 +1,149 @@
+/*
+ * TTA demuxer
+ * Copyright (c) 2006 Alex Beregszaszi
+ *
+ * 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
+ */
+#include "avformat.h"
+#include "bitstream.h"
+
+typedef struct {
+    int totalframes, currentframe;
+} TTAContext;
+
+static int tta_probe(AVProbeData *p)
+{
+    const uint8_t *d = p->buf;
+    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;
+    uint64_t framepos;
+
+    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);
+    if(samplerate <= 0 || samplerate > 1000000){
+        av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
+        return -1;
+    }
+
+    datalen = get_le32(s->pb);
+    if(datalen < 0){
+        av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
+        return -1;
+    }
+
+    url_fskip(s->pb, 4); // header crc
+
+    framelen = samplerate*256/245;
+    c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
+    c->currentframe = 0;
+
+    if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
+        av_log(s, AV_LOG_ERROR, "totalframes too large\n");
+        return -1;
+    }
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    av_set_pts_info(st, 64, 1, samplerate);
+    st->start_time = 0;
+    st->duration = datalen;
+
+    framepos = url_ftell(s->pb) + 4*c->totalframes + 4;
+
+    for (i = 0; i < c->totalframes; i++) {
+        uint32_t size = get_le32(s->pb);
+        av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
+        framepos += size;
+    }
+    url_fskip(s->pb, 4); // seektable crc
+
+    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);
+    if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
+        //this check is redundant as get_buffer should fail
+        av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
+        return -1;
+    }
+    st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
+    url_fseek(s->pb, 0, SEEK_SET);
+    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;
+    AVStream *st = s->streams[0];
+    int size, ret;
+
+    // FIXME!
+    if (c->currentframe > c->totalframes)
+        return -1;
+
+    size = st->index_entries[c->currentframe].size;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    pkt->dts = st->index_entries[c->currentframe++].timestamp;
+    return ret;
+}
+
+static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+    TTAContext *c = s->priv_data;
+    AVStream *st = s->streams[stream_index];
+    int index = av_index_search_timestamp(st, timestamp, flags);
+    if (index < 0)
+        return -1;
+
+    c->currentframe = index;
+    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
+
+    return 0;
+}
+
+AVInputFormat tta_demuxer = {
+    "tta",
+    "true-audio",
+    sizeof(TTAContext),
+    tta_probe,
+    tta_read_header,
+    tta_read_packet,
+    NULL,
+    tta_read_seek,
+    .extensions = "tta",
+};