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https://git.ffmpeg.org/ffmpeg.git
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da23151eaf
All but one read are byte aligned, so there's no point in using the GetBitContext API. Signed-off-by: James Almer <jamrial@gmail.com>
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
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* Copyright (C) 2005 Matthieu CASTET
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "internal.h"
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#include "oggdec.h"
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#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
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static int
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flac_header (AVFormatContext * s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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GetByteContext gb;
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int mdt, ret;
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if (os->buf[os->pstart] == 0xff)
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return 0;
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bytestream2_init(&gb, os->buf + os->pstart, os->psize);
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mdt = bytestream2_get_byte(&gb) & 0x7F;
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if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
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uint32_t samplerate;
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if (bytestream2_get_bytes_left(&gb) < 4 + 4 + 4 + 4 + FLAC_STREAMINFO_SIZE)
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return AVERROR_INVALIDDATA;
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bytestream2_skipu(&gb, 4); /* "FLAC" */
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if (bytestream2_get_byteu(&gb) != 1) /* unsupported major version */
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return -1;
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bytestream2_skipu(&gb, 1 + 2); /* minor version + header count */
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bytestream2_skipu(&gb, 4); /* "fLaC" */
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/* METADATA_BLOCK_HEADER */
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if (bytestream2_get_be32u(&gb) != FLAC_STREAMINFO_SIZE)
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return -1;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_FLAC;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
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if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
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return ret;
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bytestream2_get_bufferu(&gb, st->codecpar->extradata, FLAC_STREAMINFO_SIZE);
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samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
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if (!samplerate)
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return AVERROR_INVALIDDATA;
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avpriv_set_pts_info(st, 64, 1, samplerate);
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} else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
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}
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return 1;
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}
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static int
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old_flac_header (AVFormatContext * s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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AVStream *st = s->streams[idx];
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struct ogg_stream *os = ogg->streams + idx;
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AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
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AVCodecContext *avctx;
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int size, ret;
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uint8_t *data;
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if (!parser)
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return -1;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_FLAC;
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avctx = avcodec_alloc_context3(NULL);
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if (!avctx) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = avcodec_parameters_to_context(avctx, st->codecpar);
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if (ret < 0)
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goto fail;
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parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
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av_parser_parse2(parser, avctx,
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&data, &size, os->buf + os->pstart, os->psize,
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AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
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av_parser_close(parser);
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if (avctx->sample_rate) {
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avpriv_set_pts_info(st, 64, 1, avctx->sample_rate);
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avcodec_free_context(&avctx);
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return 0;
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}
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avcodec_free_context(&avctx);
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return 1;
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fail:
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av_parser_close(parser);
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avcodec_free_context(&avctx);
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return ret;
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}
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const struct ogg_codec ff_flac_codec = {
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.magic = "\177FLAC",
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.magicsize = 5,
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.header = flac_header,
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.nb_header = 2,
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};
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const struct ogg_codec ff_old_flac_codec = {
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.magic = "fLaC",
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.magicsize = 4,
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.header = old_flac_header,
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.nb_header = 0,
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};
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