1/*
2 *    Copyright (C) 2005  Matthieu CASTET
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <stdlib.h>
22#include "libavcodec/get_bits.h"
23#include "libavcodec/flac.h"
24#include "avformat.h"
25#include "internal.h"
26#include "oggdec.h"
27
28#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
29
30static int
31flac_header (AVFormatContext * s, int idx)
32{
33    struct ogg *ogg = s->priv_data;
34    struct ogg_stream *os = ogg->streams + idx;
35    AVStream *st = s->streams[idx];
36    GetBitContext gb;
37    int mdt, ret;
38
39    if (os->buf[os->pstart] == 0xff)
40        return 0;
41
42    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
43    skip_bits1(&gb); /* metadata_last */
44    mdt = get_bits(&gb, 7);
45
46    if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
47        uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
48        uint32_t samplerate;
49
50        skip_bits_long(&gb, 4*8); /* "FLAC" */
51        if(get_bits(&gb, 8) != 1) /* unsupported major version */
52            return -1;
53        skip_bits(&gb, 8 + 16);   /* minor version + header count */
54        skip_bits_long(&gb, 4*8); /* "fLaC" */
55
56        /* METADATA_BLOCK_HEADER */
57        if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
58            return -1;
59
60        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
61        st->codecpar->codec_id = AV_CODEC_ID_FLAC;
62        ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
63
64        if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
65            return ret;
66        memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size);
67
68        samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
69        if (!samplerate)
70            return AVERROR_INVALIDDATA;
71
72        avpriv_set_pts_info(st, 64, 1, samplerate);
73    } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
74        ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
75    }
76
77    return 1;
78}
79
80static int
81old_flac_header (AVFormatContext * s, int idx)
82{
83    struct ogg *ogg = s->priv_data;
84    AVStream *st = s->streams[idx];
85    struct ogg_stream *os = ogg->streams + idx;
86    AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
87    AVCodecContext *avctx;
88    int size, ret;
89    uint8_t *data;
90
91    if (!parser)
92        return -1;
93
94    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
95    st->codecpar->codec_id = AV_CODEC_ID_FLAC;
96
97    avctx = avcodec_alloc_context3(NULL);
98    if (!avctx) {
99        ret = AVERROR(ENOMEM);
100        goto fail;
101    }
102
103    ret = avcodec_parameters_to_context(avctx, st->codecpar);
104    if (ret < 0)
105        goto fail;
106
107    parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
108    av_parser_parse2(parser, avctx,
109                     &data, &size, os->buf + os->pstart, os->psize,
110                     AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
111
112    av_parser_close(parser);
113
114    if (avctx->sample_rate) {
115        avpriv_set_pts_info(st, 64, 1, avctx->sample_rate);
116        avcodec_free_context(&avctx);
117        return 0;
118    }
119
120    avcodec_free_context(&avctx);
121    return 1;
122fail:
123    av_parser_close(parser);
124    avcodec_free_context(&avctx);
125    return ret;
126}
127
128const struct ogg_codec ff_flac_codec = {
129    .magic = "\177FLAC",
130    .magicsize = 5,
131    .header = flac_header,
132    .nb_header = 2,
133};
134
135const struct ogg_codec ff_old_flac_codec = {
136    .magic = "fLaC",
137    .magicsize = 4,
138    .header = old_flac_header,
139    .nb_header = 0,
140};
141