libavformat/oggparseflac.c

   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/avcodec.h"
  23 #include "libavcodec/bytestream.h"
  24 #include "libavcodec/flac.h"
  25 #include "avformat.h"
  26 #include "internal.h"
  27 #include "oggdec.h"
  28
  29 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
  30 #define OGG_FLAC_MAGIC "\177FLAC"
  31 #define OGG_FLAC_MAGIC_SIZE sizeof(OGG_FLAC_MAGIC)-1
  32
  33 static int
  34 flac_header (AVFormatContext * s, int idx)
  35 {
  36     struct ogg *ogg = s->priv_data;
  37     struct ogg_stream *os = ogg->streams + idx;
  38     AVStream *st = s->streams[idx];
  39     GetByteContext gb;
  40     int mdt, ret;
  41
  42     if (os->buf[os->pstart] == 0xff)
  43         return 0;
  44
  45     bytestream2_init(&gb, os->buf + os->pstart, os->psize);
  46     mdt = bytestream2_get_byte(&gb) & 0x7F;
  47
  48     if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
  49         uint32_t samplerate;
  50
  51         if (bytestream2_get_bytes_left(&gb) < 4 + 4 + 4 + 4 + FLAC_STREAMINFO_SIZE)
  52             return AVERROR_INVALIDDATA;
  53         bytestream2_skipu(&gb, 4); /* "FLAC" */
  54         if (bytestream2_get_byteu(&gb) != 1) /* unsupported major version */
  55             return -1;
  56         bytestream2_skipu(&gb, 1 + 2); /* minor version + header count */
  57         bytestream2_skipu(&gb, 4); /* "fLaC" */
  58
  59         /* METADATA_BLOCK_HEADER */
  60         if (bytestream2_get_be32u(&gb) != FLAC_STREAMINFO_SIZE)
  61             return -1;
  62
  63         st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
  64         st->codecpar->codec_id = AV_CODEC_ID_FLAC;
  65         ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
  66
  67         if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
  68             return ret;
  69         bytestream2_get_bufferu(&gb, st->codecpar->extradata, FLAC_STREAMINFO_SIZE);
  70
  71         samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
  72         if (!samplerate)
  73             return AVERROR_INVALIDDATA;
  74
  75         avpriv_set_pts_info(st, 64, 1, samplerate);
  76     } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
  77         ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
  78     }
  79
  80     return 1;
  81 }
  82
  83 static int
  84 flac_packet (AVFormatContext * s, int idx)
  85 {
  86     struct ogg *ogg = s->priv_data;
  87     struct ogg_stream *os = ogg->streams + idx;
  88     AVStream *st = s->streams[idx];
  89     int ret;
  90
  91     if (os->psize > OGG_FLAC_MAGIC_SIZE &&
  92         !memcmp(
  93             os->buf + os->pstart,
  94             OGG_FLAC_MAGIC,
  95             OGG_FLAC_MAGIC_SIZE))
  96         return 1;
  97
  98     if (os->psize > 0 &&
  99         ((os->buf[os->pstart] & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT)) {
 100         ret = ff_vorbis_update_metadata(s, st, os->buf + os->pstart + 4,
 101                                         os->psize - 4);
 102         if (ret < 0)
 103             return ret;
 104
 105         return 1;
 106     }
 107
 108     return 0;
 109 }
 110
 111 static int
 112 old_flac_header (AVFormatContext * s, int idx)
 113 {
 114     struct ogg *ogg = s->priv_data;
 115     AVStream *st = s->streams[idx];
 116     struct ogg_stream *os = ogg->streams + idx;
 117     AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
 118     AVCodecContext *avctx;
 119     int size, ret;
 120     uint8_t *data;
 121
 122     if (!parser)
 123         return -1;
 124
 125     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 126     st->codecpar->codec_id = AV_CODEC_ID_FLAC;
 127
 128     avctx = avcodec_alloc_context3(NULL);
 129     if (!avctx) {
 130         ret = AVERROR(ENOMEM);
 131         goto fail;
 132     }
 133
 134     ret = avcodec_parameters_to_context(avctx, st->codecpar);
 135     if (ret < 0)
 136         goto fail;
 137
 138     parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
 139     av_parser_parse2(parser, avctx,
 140                      &data, &size, os->buf + os->pstart, os->psize,
 141                      AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
 142
 143     av_parser_close(parser);
 144
 145     if (avctx->sample_rate) {
 146         avpriv_set_pts_info(st, 64, 1, avctx->sample_rate);
 147         avcodec_free_context(&avctx);
 148         return 0;
 149     }
 150
 151     avcodec_free_context(&avctx);
 152     return 1;
 153 fail:
 154     av_parser_close(parser);
 155     avcodec_free_context(&avctx);
 156     return ret;
 157 }
 158
 159 const struct ogg_codec ff_flac_codec = {
 160     .magic = OGG_FLAC_MAGIC,
 161     .magicsize = OGG_FLAC_MAGIC_SIZE,
 162     .header = flac_header,
 163     .nb_header = 2,
 164     .packet = flac_packet,
 165 };
 166
 167 const struct ogg_codec ff_old_flac_codec = {
 168     .magic = "fLaC",
 169     .magicsize = 4,
 170     .header = old_flac_header,
 171     .nb_header = 0,
 172 };