upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/libavformat/tta.c

@@ -0,0 +1,189 @@
+/*
+ * 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 "libavcodec/get_bits.h"
+#include "apetag.h"
+#include "avformat.h"
+#include "avio_internal.h"
+#include "internal.h"
+#include "id3v1.h"
+#include "libavutil/crc.h"
+#include "libavutil/dict.h"
+
+typedef struct {
+    int totalframes, currentframe;
+    int frame_size;
+    int last_frame_size;
+} TTAContext;
+
+static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf,
+                                   unsigned int len)
+{
+    return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
+}
+
+static int tta_probe(AVProbeData *p)
+{
+    if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
+        (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
+        AV_RL16(&p->buf[6]) > 0 &&
+        AV_RL16(&p->buf[8]) > 0 &&
+        AV_RL32(&p->buf[10]) > 0)
+        return AVPROBE_SCORE_EXTENSION + 30;
+    return 0;
+}
+
+static int tta_read_header(AVFormatContext *s)
+{
+    TTAContext *c = s->priv_data;
+    AVStream *st;
+    int i, channels, bps, samplerate;
+    uint64_t framepos, start_offset;
+    uint32_t nb_samples, crc;
+
+    ff_id3v1_read(s);
+
+    start_offset = avio_tell(s->pb);
+    ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
+    if (avio_rl32(s->pb) != AV_RL32("TTA1"))
+        return AVERROR_INVALIDDATA;
+
+    avio_skip(s->pb, 2); // FIXME: flags
+    channels = avio_rl16(s->pb);
+    bps = avio_rl16(s->pb);
+    samplerate = avio_rl32(s->pb);
+    if(samplerate <= 0 || samplerate > 1000000){
+        av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    nb_samples = avio_rl32(s->pb);
+    if (!nb_samples) {
+        av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
+    if (crc != avio_rl32(s->pb)) {
+        av_log(s, AV_LOG_ERROR, "Header CRC error\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    c->frame_size      = samplerate * 256 / 245;
+    c->last_frame_size = nb_samples % c->frame_size;
+    if (!c->last_frame_size)
+        c->last_frame_size = c->frame_size;
+    c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
+    c->currentframe = 0;
+
+    if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
+        av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
+        return AVERROR_INVALIDDATA;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    avpriv_set_pts_info(st, 64, 1, samplerate);
+    st->start_time = 0;
+    st->duration = nb_samples;
+
+    framepos = avio_tell(s->pb) + 4*c->totalframes + 4;
+
+    if (ff_alloc_extradata(st->codec, avio_tell(s->pb) - start_offset))
+        return AVERROR(ENOMEM);
+
+    avio_seek(s->pb, start_offset, SEEK_SET);
+    avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
+
+    ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
+    for (i = 0; i < c->totalframes; i++) {
+        uint32_t size = avio_rl32(s->pb);
+        av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
+                           AVINDEX_KEYFRAME);
+        framepos += size;
+    }
+    crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
+    if (crc != avio_rl32(s->pb)) {
+        av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id = AV_CODEC_ID_TTA;
+    st->codec->channels = channels;
+    st->codec->sample_rate = samplerate;
+    st->codec->bits_per_coded_sample = bps;
+
+    if (s->pb->seekable) {
+        int64_t pos = avio_tell(s->pb);
+        ff_ape_parse_tag(s);
+        avio_seek(s->pb, pos, SEEK_SET);
+    }
+
+    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 AVERROR_EOF;
+
+    size = st->index_entries[c->currentframe].size;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    pkt->dts = st->index_entries[c->currentframe++].timestamp;
+    pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
+                                                        c->frame_size;
+    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;
+    if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
+        return -1;
+
+    c->currentframe = index;
+
+    return 0;
+}
+
+AVInputFormat ff_tta_demuxer = {
+    .name           = "tta",
+    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
+    .priv_data_size = sizeof(TTAContext),
+    .read_probe     = tta_probe,
+    .read_header    = tta_read_header,
+    .read_packet    = tta_read_packet,
+    .read_seek      = tta_read_seek,
+    .extensions     = "tta",
+};