ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/oggparseflac.c

@@ -0,0 +1,123 @@
+/*
+ *    Copyright (C) 2005  Matthieu CASTET
+ *
+ * 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 <stdlib.h>
+#include "libavcodec/get_bits.h"
+#include "libavcodec/flac.h"
+#include "avformat.h"
+#include "internal.h"
+#include "oggdec.h"
+
+#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
+
+static int
+flac_header (AVFormatContext * s, int idx)
+{
+    struct ogg *ogg = s->priv_data;
+    struct ogg_stream *os = ogg->streams + idx;
+    AVStream *st = s->streams[idx];
+    GetBitContext gb;
+    int mdt;
+
+    if (os->buf[os->pstart] == 0xff)
+        return 0;
+
+    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
+    skip_bits1(&gb); /* metadata_last */
+    mdt = get_bits(&gb, 7);
+
+    if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
+        uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
+        uint32_t samplerate;
+
+        skip_bits_long(&gb, 4*8); /* "FLAC" */
+        if(get_bits(&gb, 8) != 1) /* unsupported major version */
+            return -1;
+        skip_bits_long(&gb, 8 + 16); /* minor version + header count */
+        skip_bits_long(&gb, 4*8); /* "fLaC" */
+
+        /* METADATA_BLOCK_HEADER */
+        if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
+            return -1;
+
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        st->codec->codec_id = AV_CODEC_ID_FLAC;
+        st->need_parsing = AVSTREAM_PARSE_HEADERS;
+
+        if (ff_alloc_extradata(st->codec, FLAC_STREAMINFO_SIZE) < 0)
+            return AVERROR(ENOMEM);
+        memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size);
+
+        samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
+        if (!samplerate)
+            return AVERROR_INVALIDDATA;
+
+        avpriv_set_pts_info(st, 64, 1, samplerate);
+    } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
+        ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
+    }
+
+    return 1;
+}
+
+static int
+old_flac_header (AVFormatContext * s, int idx)
+{
+    struct ogg *ogg = s->priv_data;
+    AVStream *st = s->streams[idx];
+    struct ogg_stream *os = ogg->streams + idx;
+    AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
+    int size;
+    uint8_t *data;
+
+    if (!parser)
+        return -1;
+
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id = AV_CODEC_ID_FLAC;
+
+    parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
+    av_parser_parse2(parser, st->codec,
+                     &data, &size, os->buf + os->pstart, os->psize,
+                     AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
+
+    av_parser_close(parser);
+
+    if (st->codec->sample_rate) {
+        avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+        return 0;
+    }
+
+    return 1;
+}
+
+const struct ogg_codec ff_flac_codec = {
+    .magic = "\177FLAC",
+    .magicsize = 5,
+    .header = flac_header,
+    .nb_header = 2,
+};
+
+const struct ogg_codec ff_old_flac_codec = {
+    .magic = "fLaC",
+    .magicsize = 4,
+    .header = old_flac_header,
+    .nb_header = 0,
+};