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323 lines
10 KiB
323 lines
10 KiB
/* |
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* MP3 muxer |
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* Copyright (c) 2003 Fabrice Bellard |
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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 <strings.h> |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "id3v1.h" |
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#include "id3v2.h" |
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#include "rawenc.h" |
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#include "libavutil/avstring.h" |
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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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#include "libavutil/intreadwrite.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/dict.h" |
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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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{ |
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AVDictionaryEntry *tag; |
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if ((tag = av_dict_get(s->metadata, key, NULL, 0))) |
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av_strlcpy(buf, tag->value, buf_size); |
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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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AVDictionaryEntry *tag; |
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int i, count = 0; |
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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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count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title |
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count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist |
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count += id3v1_set_string(s, "TALB", buf + 63, 30); //album |
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count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date |
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count += id3v1_set_string(s, "comment", buf + 97, 30); |
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if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track |
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buf[125] = 0; |
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buf[126] = atoi(tag->value); |
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count++; |
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} |
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buf[127] = 0xFF; /* default to unknown genre */ |
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if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre |
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for(i = 0; i <= ID3v1_GENRE_MAX; i++) { |
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if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) { |
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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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} |
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} |
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return count; |
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} |
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/* simple formats */ |
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static void id3v2_put_size(AVFormatContext *s, int size) |
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{ |
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avio_w8(s->pb, size >> 21 & 0x7f); |
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avio_w8(s->pb, size >> 14 & 0x7f); |
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avio_w8(s->pb, size >> 7 & 0x7f); |
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avio_w8(s->pb, size & 0x7f); |
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} |
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static int string_is_ascii(const uint8_t *str) |
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{ |
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while (*str && *str < 128) str++; |
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return !*str; |
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} |
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/** |
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* Write a text frame with one (normal frames) or two (TXXX frames) strings |
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* according to encoding (only UTF-8 or UTF-16+BOM supported). |
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* @return number of bytes written or a negative error code. |
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*/ |
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static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2, |
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uint32_t tag, enum ID3v2Encoding enc) |
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{ |
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int len; |
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uint8_t *pb; |
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int (*put)(AVIOContext*, const char*); |
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AVIOContext *dyn_buf; |
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if (avio_open_dyn_buf(&dyn_buf) < 0) |
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return AVERROR(ENOMEM); |
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/* check if the strings are ASCII-only and use UTF16 only if |
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* they're not */ |
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if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) && |
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(!str2 || string_is_ascii(str2))) |
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enc = ID3v2_ENCODING_ISO8859; |
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avio_w8(dyn_buf, enc); |
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if (enc == ID3v2_ENCODING_UTF16BOM) { |
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avio_wl16(dyn_buf, 0xFEFF); /* BOM */ |
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put = avio_put_str16le; |
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} else |
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put = avio_put_str; |
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put(dyn_buf, str1); |
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if (str2) |
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put(dyn_buf, str2); |
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len = avio_close_dyn_buf(dyn_buf, &pb); |
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avio_wb32(s->pb, tag); |
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id3v2_put_size(s, len); |
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avio_wb16(s->pb, 0); |
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avio_write(s->pb, pb, len); |
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av_freep(&pb); |
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return len + ID3v2_HEADER_SIZE; |
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} |
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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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int write_id3v1; |
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int64_t nb_frames_offset; |
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} MP3Context; |
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static int mp3_write_trailer(struct AVFormatContext *s) |
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{ |
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uint8_t buf[ID3v1_TAG_SIZE]; |
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MP3Context *mp3 = s->priv_data; |
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/* write the id3v1 tag */ |
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if (mp3 && mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) { |
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avio_write(s->pb, buf, ID3v1_TAG_SIZE); |
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} |
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/* write number of frames */ |
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if (mp3 && mp3->nb_frames_offset) { |
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avio_seek(s->pb, mp3->nb_frames_offset, SEEK_SET); |
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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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return 0; |
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} |
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#if CONFIG_MP2_MUXER |
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AVOutputFormat ff_mp2_muxer = { |
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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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.write_trailer = mp3_write_trailer, |
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}; |
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#endif |
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#if CONFIG_MP3_MUXER |
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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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offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, {.dbl = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM}, |
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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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offsetof(MP3Context, write_id3v1), FF_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM}, |
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{ NULL }, |
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}; |
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static const AVClass mp3_muxer_class = { |
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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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}; |
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static int id3v2_check_write_tag(AVFormatContext *s, AVDictionaryEntry *t, const char table[][4], |
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enum ID3v2Encoding enc) |
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{ |
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uint32_t tag; |
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int i; |
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if (t->key[0] != 'T' || strlen(t->key) != 4) |
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return -1; |
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tag = AV_RB32(t->key); |
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for (i = 0; *table[i]; i++) |
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if (tag == AV_RB32(table[i])) |
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return id3v2_put_ttag(s, t->value, NULL, tag, enc); |
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return -1; |
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} |
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/* insert a dummy frame containing number of frames */ |
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static void 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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int bitrate_idx = 1; // 32 kbps |
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int64_t xing_offset = (codec->channels == 2) ? 32 : 17; |
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int32_t header; |
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MPADecodeHeader mpah; |
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int srate_idx, i, channels; |
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for (i = 0; i < FF_ARRAY_ELEMS(ff_mpa_freq_tab); i++) |
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if (ff_mpa_freq_tab[i] == codec->sample_rate) { |
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srate_idx = i; |
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break; |
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} |
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if (i == FF_ARRAY_ELEMS(ff_mpa_freq_tab)) { |
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av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n"); |
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return; |
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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; |
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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 |= (bitrate_idx << 4 | srate_idx << 2) << 8; |
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header |= channels << 6; |
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avio_wb32(s->pb, header); |
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ff_mpegaudio_decode_header(&mpah, header); |
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ffio_fill(s->pb, 0, xing_offset); |
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ffio_wfourcc(s->pb, "Xing"); |
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avio_wb32(s->pb, 0x1); // only number of frames |
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mp3->nb_frames_offset = avio_tell(s->pb); |
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avio_wb32(s->pb, 0); |
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mpah.frame_size -= 4 + xing_offset + 4 + 4 + 4; |
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ffio_fill(s->pb, 0, mpah.frame_size); |
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} |
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/** |
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* Write an ID3v2 header at beginning of stream |
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*/ |
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static int mp3_write_header(struct AVFormatContext *s) |
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{ |
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MP3Context *mp3 = s->priv_data; |
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AVDictionaryEntry *t = NULL; |
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int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM : |
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ID3v2_ENCODING_UTF8; |
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int64_t size_pos, cur_pos; |
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avio_wb32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version)); |
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avio_w8(s->pb, 0); |
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avio_w8(s->pb, 0); /* flags */ |
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/* reserve space for size */ |
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size_pos = avio_tell(s->pb); |
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avio_wb32(s->pb, 0); |
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ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL); |
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if (mp3->id3v2_version == 4) |
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ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL); |
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) { |
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int ret; |
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if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) { |
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totlen += ret; |
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continue; |
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} |
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if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ? |
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ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) { |
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totlen += ret; |
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continue; |
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} |
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/* unknown tag, write as TXXX frame */ |
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if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0) |
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return ret; |
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totlen += ret; |
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} |
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cur_pos = avio_tell(s->pb); |
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avio_seek(s->pb, size_pos, SEEK_SET); |
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id3v2_put_size(s, totlen); |
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avio_seek(s->pb, cur_pos, SEEK_SET); |
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if (s->pb->seekable) |
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mp3_write_xing(s); |
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return 0; |
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} |
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AVOutputFormat ff_mp3_muxer = { |
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.name = "mp3", |
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.long_name = NULL_IF_CONFIG_SMALL("MPEG audio layer 3"), |
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.mime_type = "audio/x-mpeg", |
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.extensions = "mp3", |
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.priv_data_size = sizeof(MP3Context), |
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.audio_codec = CODEC_ID_MP3, |
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.video_codec = CODEC_ID_NONE, |
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.write_header = mp3_write_header, |
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.write_packet = ff_raw_write_packet, |
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.write_trailer = mp3_write_trailer, |
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.flags = AVFMT_NOTIMESTAMPS, |
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.priv_class = &mp3_muxer_class, |
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}; |
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#endif
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