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https://github.com/FFmpeg/FFmpeg.git
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132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*
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* raw FLAC muxer
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* Copyright (c) 2006-2009 Justin Ruggles
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavcodec/flac.h"
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#include "avformat.h"
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#include "flacenc.h"
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#include "vorbiscomment.h"
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#include "libavcodec/bytestream.h"
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static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
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int last_block)
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{
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avio_w8(pb, last_block ? 0x81 : 0x01);
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avio_wb24(pb, n_padding_bytes);
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while (n_padding_bytes > 0) {
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avio_w8(pb, 0);
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n_padding_bytes--;
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}
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return 0;
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}
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static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
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int last_block, int bitexact)
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{
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const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
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unsigned int len, count;
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uint8_t *p, *p0;
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ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
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len = ff_vorbiscomment_length(*m, vendor, &count);
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p0 = av_malloc(len+4);
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if (!p0)
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return AVERROR(ENOMEM);
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p = p0;
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bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
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bytestream_put_be24(&p, len);
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ff_vorbiscomment_write(&p, m, vendor, count);
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avio_write(pb, p0, len+4);
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av_freep(&p0);
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p = NULL;
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return 0;
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}
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static int flac_write_header(struct AVFormatContext *s)
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{
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int ret;
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AVCodecContext *codec = s->streams[0]->codec;
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ret = ff_flac_write_header(s->pb, codec, 0);
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if (ret)
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return ret;
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ret = flac_write_block_comment(s->pb, &s->metadata, 0,
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codec->flags & CODEC_FLAG_BITEXACT);
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if (ret)
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return ret;
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/* The command line flac encoder defaults to placing a seekpoint
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* every 10s. So one might add padding to allow that later
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* but there seems to be no simple way to get the duration here.
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* So let's try the flac default of 8192 bytes */
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flac_write_block_padding(s->pb, 8192, 1);
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return ret;
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}
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static int flac_write_trailer(struct AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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uint8_t *streaminfo;
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enum FLACExtradataFormat format;
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int64_t file_size;
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if (!avpriv_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
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return -1;
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if (pb->seekable) {
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/* rewrite the STREAMINFO header block data */
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file_size = avio_tell(pb);
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avio_seek(pb, 8, SEEK_SET);
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avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
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avio_seek(pb, file_size, SEEK_SET);
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avio_flush(pb);
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} else {
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av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
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}
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return 0;
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}
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static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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avio_write(s->pb, pkt->data, pkt->size);
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avio_flush(s->pb);
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return 0;
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}
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AVOutputFormat ff_flac_muxer = {
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.name = "flac",
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.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
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.mime_type = "audio/x-flac",
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.extensions = "flac",
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.audio_codec = CODEC_ID_FLAC,
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.video_codec = CODEC_ID_NONE,
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.write_header = flac_write_header,
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.write_packet = flac_write_packet,
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.write_trailer = flac_write_trailer,
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.flags= AVFMT_NOTIMESTAMPS,
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};
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