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