2005-12-17 20:14:38 +02:00
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/*
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2011-01-21 15:53:46 +02:00
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* MP3 muxer
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2009-01-19 17:46:40 +02:00
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* Copyright (c) 2003 Fabrice Bellard
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2003-09-09 01:34:28 +03:00
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*
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2006-10-07 18:30:46 +03:00
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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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2003-09-09 01:34:28 +03:00
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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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2006-10-07 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-09-09 01:34:28 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* FFmpeg is distributed in the hope that it will be useful,
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2003-09-09 01:34:28 +03:00
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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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2006-10-07 18:30:46 +03:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-13 00:43:26 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-09-09 01:34:28 +03:00
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*/
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2008-05-09 14:56:36 +03:00
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2003-09-09 01:34:28 +03:00
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#include "avformat.h"
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2011-03-21 22:02:50 +02:00
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#include "avio_internal.h"
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2009-06-11 18:26:57 +03:00
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#include "id3v1.h"
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2011-01-21 15:53:46 +02:00
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#include "id3v2.h"
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2011-03-16 15:31:32 +02:00
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#include "rawenc.h"
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2011-05-03 21:19:31 +03:00
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#include "libavutil/avstring.h"
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2011-03-21 22:02:50 +02:00
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#include "libavcodec/mpegaudio.h"
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#include "libavcodec/mpegaudiodata.h"
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#include "libavcodec/mpegaudiodecheader.h"
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2011-01-21 15:53:46 +02:00
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#include "libavutil/intreadwrite.h"
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2011-01-21 21:54:35 +02:00
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#include "libavutil/opt.h"
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2011-05-21 06:00:01 +03:00
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#include "libavcodec/mpegaudio.h"
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2011-05-07 03:23:28 +03:00
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#include "libavcodec/mpegaudiodata.h"
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#include "libavcodec/mpegaudiodecheader.h"
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#include "libavformat/avio_internal.h"
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2011-05-22 13:46:29 +03:00
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#include "libavutil/dict.h"
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2007-05-22 11:23:45 +03:00
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2009-02-03 00:13:03 +02:00
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static int id3v1_set_string(AVFormatContext *s, const char *key,
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uint8_t *buf, int buf_size)
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2008-07-11 10:41:11 +03:00
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{
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2011-05-22 13:46:29 +03:00
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AVDictionaryEntry *tag;
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if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
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2011-05-03 21:19:31 +03:00
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av_strlcpy(buf, tag->value, buf_size);
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2009-02-03 00:13:03 +02:00
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return !!tag;
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}
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static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
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{
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2011-05-22 13:46:29 +03:00
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AVDictionaryEntry *tag;
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2009-02-03 00:13:03 +02:00
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int i, count = 0;
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2008-07-11 10:41:11 +03:00
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memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
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buf[0] = 'T';
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buf[1] = 'A';
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buf[2] = 'G';
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2011-10-31 17:11:37 +03:00
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/* we knowingly overspecify each tag length by one byte to compensate for the mandatory null byte added by av_strlcpy */
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count += id3v1_set_string(s, "TIT2", buf + 3, 30 + 1); //title
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count += id3v1_set_string(s, "TPE1", buf + 33, 30 + 1); //author|artist
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count += id3v1_set_string(s, "TALB", buf + 63, 30 + 1); //album
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count += id3v1_set_string(s, "TDRL", buf + 93, 4 + 1); //date
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count += id3v1_set_string(s, "comment", buf + 97, 30 + 1);
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2011-05-22 13:46:29 +03:00
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if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
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2008-07-11 10:41:11 +03:00
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buf[125] = 0;
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2009-02-03 00:13:03 +02:00
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buf[126] = atoi(tag->value);
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count++;
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2008-07-11 10:41:11 +03:00
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}
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2009-09-16 02:40:10 +03:00
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buf[127] = 0xFF; /* default to unknown genre */
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2011-05-22 13:46:29 +03:00
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if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
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2009-02-03 00:14:28 +02:00
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for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
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2011-11-02 22:17:25 +03:00
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if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
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2009-02-03 00:14:28 +02:00
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buf[127] = i;
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count++;
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break;
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}
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2008-07-11 10:41:11 +03:00
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}
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}
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2009-02-03 00:13:03 +02:00
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return count;
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2008-07-11 10:41:11 +03:00
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}
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2011-07-09 03:06:40 +03:00
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#define VBR_NUM_BAGS 400
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#define VBR_TOC_SIZE 100
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2011-10-24 02:01:21 +03:00
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2011-03-21 22:02:50 +02:00
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typedef struct MP3Context {
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const AVClass *class;
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int id3v2_version;
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2011-08-16 12:43:23 +03:00
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int write_id3v1;
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2011-07-09 03:06:40 +03:00
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int64_t frames_offset;
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int32_t frames;
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int32_t size;
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uint32_t want;
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uint32_t seen;
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uint32_t pos;
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uint64_t bag[VBR_NUM_BAGS];
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2011-03-21 22:02:50 +02:00
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} MP3Context;
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2011-05-07 03:23:28 +03:00
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static int mp2_write_trailer(struct AVFormatContext *s)
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2009-10-20 02:22:23 +03:00
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{
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uint8_t buf[ID3v1_TAG_SIZE];
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2011-03-21 22:02:50 +02:00
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MP3Context *mp3 = s->priv_data;
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2009-10-20 02:22:23 +03:00
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/* write the id3v1 tag */
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2011-08-16 12:43:23 +03:00
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if (mp3 && mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
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2011-02-21 20:28:17 +02:00
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avio_write(s->pb, buf, ID3v1_TAG_SIZE);
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2009-10-20 02:22:23 +03:00
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}
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2011-03-21 22:02:50 +02:00
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/* write number of frames */
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2011-07-09 03:06:40 +03:00
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if (mp3 && mp3->frames_offset) {
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avio_seek(s->pb, mp3->frames_offset, SEEK_SET);
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2011-03-21 22:02:50 +02:00
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avio_wb32(s->pb, s->streams[0]->nb_frames);
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avio_seek(s->pb, 0, SEEK_END);
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}
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avio_flush(s->pb);
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2009-10-20 02:22:23 +03:00
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return 0;
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}
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#if CONFIG_MP2_MUXER
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2011-01-26 00:03:28 +02:00
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AVOutputFormat ff_mp2_muxer = {
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2011-07-16 23:18:12 +03:00
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.name = "mp2",
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.long_name = NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
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.mime_type = "audio/x-mpeg",
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.extensions = "mp2,m2a",
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.audio_codec = CODEC_ID_MP2,
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.video_codec = CODEC_ID_NONE,
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.write_packet = ff_raw_write_packet,
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2011-07-17 20:52:05 +03:00
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.write_trailer = mp2_write_trailer,
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2011-08-28 22:43:04 +03:00
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.flags = AVFMT_NOTIMESTAMPS,
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2009-10-20 02:22:23 +03:00
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};
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#endif
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#if CONFIG_MP3_MUXER
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2011-01-21 21:54:35 +02:00
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static const AVOption options[] = {
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{ "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
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2011-10-04 08:38:01 +03:00
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offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.dbl = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
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2011-08-16 12:43:23 +03:00
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{ "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
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2011-10-04 08:38:01 +03:00
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offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
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2011-01-21 21:54:35 +02:00
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{ NULL },
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};
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static const AVClass mp3_muxer_class = {
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2011-04-29 12:30:02 +03:00
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.class_name = "MP3 muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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2011-01-21 21:54:35 +02:00
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};
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2011-05-07 03:23:28 +03:00
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static const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
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/*
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* Write an empty XING header and initialize respective data.
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*/
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static int mp3_write_xing(AVFormatContext *s)
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{
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AVCodecContext *codec = s->streams[0]->codec;
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MP3Context *mp3 = s->priv_data;
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2011-11-14 22:57:30 +03:00
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int bitrate_idx;
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int best_bitrate_idx;
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int best_bitrate_error= INT_MAX;
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2011-05-07 03:23:28 +03:00
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int64_t xing_offset;
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int32_t mask, header;
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MPADecodeHeader c;
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int srate_idx, i, channels;
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int needed;
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2011-10-17 10:28:53 +03:00
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for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++)
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if (avpriv_mpa_freq_tab[i] == codec->sample_rate) {
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2011-05-07 03:23:28 +03:00
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srate_idx = i;
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break;
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}
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2011-10-17 10:28:53 +03:00
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if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
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2011-05-07 03:23:28 +03:00
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av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
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return -1;
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}
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switch (codec->channels) {
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case 1: channels = MPA_MONO; break;
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case 2: channels = MPA_STEREO; break;
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default: av_log(s, AV_LOG_ERROR, "Unsupported number of channels.\n"); return -1;
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}
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/* dummy MPEG audio header */
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header = 0xff << 24; // sync
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header |= (0x7 << 5 | 0x3 << 3 | 0x1 << 1 | 0x1) << 16; // sync/mpeg-1/layer 3/no crc*/
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header |= (srate_idx << 2) << 8;
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header |= channels << 6;
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2011-11-14 22:57:30 +03:00
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for (bitrate_idx=1; bitrate_idx<15; bitrate_idx++) {
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int error;
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avpriv_mpegaudio_decode_header(&c, header | (bitrate_idx << (4+8)));
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error= FFABS(c.bit_rate - codec->bit_rate);
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if(error < best_bitrate_error){
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best_bitrate_error= error;
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best_bitrate_idx = bitrate_idx;
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}
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}
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for (bitrate_idx= best_bitrate_idx;; bitrate_idx++) {
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2011-05-07 03:23:28 +03:00
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if (15 == bitrate_idx)
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return -1;
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2011-11-14 22:45:02 +03:00
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avpriv_mpegaudio_decode_header(&c, header | (bitrate_idx << (4+8)));
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2011-05-07 03:23:28 +03:00
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xing_offset=xing_offtbl[c.lsf == 1][c.nb_channels == 1];
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needed = 4 // header
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+ xing_offset
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+ 4 // xing tag
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+ 4 // frames/size/toc flags
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+ 4 // frames
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+ 4 // size
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+ VBR_TOC_SIZE; // toc
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if (needed <= c.frame_size)
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break;
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}
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avio_wb32(s->pb, header);
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ffio_fill(s->pb, 0, xing_offset);
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2011-04-26 04:06:04 +03:00
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avio_wb32(s->pb, MKBETAG('X', 'i', 'n', 'g'));
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2011-05-07 03:23:28 +03:00
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avio_wb32(s->pb, 0x01 | 0x02 | 0x04); // frames/size/toc
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2011-04-26 04:49:53 +03:00
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mp3->frames_offset = avio_tell(s->pb);
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2011-04-26 04:45:48 +03:00
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mp3->size = c.frame_size;
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mp3->want=1;
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mp3->seen=0;
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mp3->pos=0;
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2011-05-07 03:23:28 +03:00
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avio_wb32(s->pb, 0); // frames
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avio_wb32(s->pb, 0); // size
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// toc
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for (i = 0; i < VBR_TOC_SIZE; ++i)
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avio_w8(s->pb, (uint8_t)(255 * i / VBR_TOC_SIZE));
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ffio_fill(s->pb, 0, c.frame_size - needed);
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avio_flush(s->pb);
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return 0;
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}
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/*
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* Add a frame to XING data.
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* Following lame's "VbrTag.c".
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*/
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2011-04-26 04:22:21 +03:00
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static void mp3_xing_add_frame(AVFormatContext *s, AVPacket *pkt)
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2011-05-07 03:23:28 +03:00
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{
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MP3Context *mp3 = s->priv_data;
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int i;
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2011-04-26 04:45:48 +03:00
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++mp3->frames;
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mp3->size += pkt->size;
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2011-05-07 03:23:28 +03:00
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2011-04-26 04:45:48 +03:00
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if (mp3->want == ++mp3->seen) {
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mp3->bag[mp3->pos] = mp3->size;
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2011-05-07 03:23:28 +03:00
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2011-04-26 04:45:48 +03:00
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if (VBR_NUM_BAGS == ++mp3->pos) {
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2011-05-07 03:23:28 +03:00
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/* shrink table to half size by throwing away each second bag. */
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for (i = 1; i < VBR_NUM_BAGS; i += 2)
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2011-04-26 04:45:48 +03:00
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mp3->bag[i >> 1] = mp3->bag[i];
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2011-05-07 03:23:28 +03:00
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/* double wanted amount per bag. */
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2011-04-26 04:45:48 +03:00
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mp3->want <<= 1;
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2011-05-07 03:23:28 +03:00
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/* adjust current position to half of table size. */
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2011-04-26 04:45:48 +03:00
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mp3->pos >>= 1;
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2011-05-07 03:23:28 +03:00
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}
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2011-04-26 04:45:48 +03:00
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mp3->seen = 0;
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2011-05-07 03:23:28 +03:00
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}
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}
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static void mp3_fix_xing(AVFormatContext *s)
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{
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MP3Context *mp3 = s->priv_data;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
avio_flush(s->pb);
|
2011-04-26 04:49:53 +03:00
|
|
|
avio_seek(s->pb, mp3->frames_offset, SEEK_SET);
|
2011-04-26 04:45:48 +03:00
|
|
|
avio_wb32(s->pb, mp3->frames);
|
|
|
|
avio_wb32(s->pb, mp3->size);
|
2011-05-07 03:23:28 +03:00
|
|
|
|
|
|
|
avio_w8(s->pb, 0); // first toc entry has to be zero.
|
|
|
|
|
|
|
|
for (i = 1; i < VBR_TOC_SIZE; ++i) {
|
2011-04-26 04:45:48 +03:00
|
|
|
int j = i * mp3->pos / VBR_TOC_SIZE;
|
|
|
|
int seek_point = 256LL * mp3->bag[j] / mp3->size;
|
2011-04-26 04:31:02 +03:00
|
|
|
avio_w8(s->pb, FFMIN(seek_point, 255));
|
2011-05-07 03:23:28 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
avio_flush(s->pb);
|
|
|
|
avio_seek(s->pb, 0, SEEK_END);
|
|
|
|
}
|
|
|
|
|
2007-05-22 11:28:32 +03:00
|
|
|
/**
|
2011-01-21 21:54:35 +02:00
|
|
|
* Write an ID3v2 header at beginning of stream
|
2007-05-22 11:28:32 +03:00
|
|
|
*/
|
|
|
|
|
2003-09-09 01:34:28 +03:00
|
|
|
static int mp3_write_header(struct AVFormatContext *s)
|
|
|
|
{
|
2011-01-21 21:54:35 +02:00
|
|
|
MP3Context *mp3 = s->priv_data;
|
2011-10-22 00:32:32 +03:00
|
|
|
int ret;
|
2009-10-05 19:06:00 +03:00
|
|
|
|
2011-10-22 00:32:32 +03:00
|
|
|
ret = ff_id3v2_write(s, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2007-05-22 11:28:32 +03:00
|
|
|
|
2011-05-07 03:23:28 +03:00
|
|
|
if (s->pb->seekable)
|
|
|
|
mp3_write_xing(s);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
|
|
{
|
|
|
|
if (! pkt || ! pkt->data || pkt->size < 4)
|
|
|
|
return ff_raw_write_packet(s, pkt);
|
|
|
|
else {
|
|
|
|
MP3Context *mp3 = s->priv_data;
|
2011-05-07 20:39:11 +03:00
|
|
|
#ifdef FILTER_VBR_HEADERS
|
2011-05-07 03:23:28 +03:00
|
|
|
MPADecodeHeader c;
|
|
|
|
int base;
|
|
|
|
|
|
|
|
ff_mpegaudio_decode_header(&c, AV_RB32(pkt->data));
|
|
|
|
|
|
|
|
/* filter out XING and INFO headers. */
|
|
|
|
base = 4 + xing_offtbl[c.lsf == 1][c.nb_channels == 1];
|
|
|
|
|
|
|
|
if (base + 4 <= pkt->size) {
|
|
|
|
uint32_t v = AV_RB32(pkt->data + base);
|
|
|
|
|
2011-04-26 04:06:04 +03:00
|
|
|
if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v)
|
2011-05-07 03:23:28 +03:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* filter out VBRI headers. */
|
|
|
|
base = 4 + 32;
|
|
|
|
|
2011-04-26 04:06:04 +03:00
|
|
|
if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base))
|
2011-05-07 03:23:28 +03:00
|
|
|
return 0;
|
|
|
|
#endif
|
|
|
|
|
2011-04-26 04:50:56 +03:00
|
|
|
if (mp3->frames_offset)
|
2011-04-26 04:22:21 +03:00
|
|
|
mp3_xing_add_frame(s, pkt);
|
2011-05-07 03:23:28 +03:00
|
|
|
|
|
|
|
return ff_raw_write_packet(s, pkt);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mp3_write_trailer(AVFormatContext *s)
|
|
|
|
{
|
|
|
|
MP3Context *mp3 = s->priv_data;
|
|
|
|
int ret=mp2_write_trailer(s);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2011-04-26 04:50:56 +03:00
|
|
|
if (mp3->frames_offset)
|
2011-05-07 03:23:28 +03:00
|
|
|
mp3_fix_xing(s);
|
|
|
|
|
2003-09-09 01:34:28 +03:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-26 00:03:28 +02:00
|
|
|
AVOutputFormat ff_mp3_muxer = {
|
2011-07-16 23:18:12 +03:00
|
|
|
.name = "mp3",
|
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
|
|
|
|
.mime_type = "audio/x-mpeg",
|
|
|
|
.extensions = "mp3",
|
|
|
|
.priv_data_size = sizeof(MP3Context),
|
|
|
|
.audio_codec = CODEC_ID_MP3,
|
|
|
|
.video_codec = CODEC_ID_NONE,
|
|
|
|
.write_header = mp3_write_header,
|
2011-07-17 20:52:05 +03:00
|
|
|
.write_packet = mp3_write_packet,
|
2011-07-16 23:18:12 +03:00
|
|
|
.write_trailer = mp3_write_trailer,
|
|
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
2011-01-21 21:54:35 +02:00
|
|
|
.priv_class = &mp3_muxer_class,
|
2003-09-09 01:34:28 +03:00
|
|
|
};
|
|
|
|
#endif
|