3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/avstring.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/opt.h"
30 #include "libavcodec/mpegaudio.h"
31 #include "libavcodec/mpegaudiodata.h"
32 #include "libavcodec/mpegaudiodecheader.h"
33 #include "libavformat/avio_internal.h"
35 static int id3v1_set_string(AVFormatContext *s, const char *key,
36 uint8_t *buf, int buf_size)
39 if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
40 av_strlcpy(buf, tag->value, buf_size);
44 static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
49 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
53 count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
54 count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
55 count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
56 count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
57 count += id3v1_set_string(s, "comment", buf + 97, 30);
58 if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
60 buf[126] = atoi(tag->value);
63 buf[127] = 0xFF; /* default to unknown genre */
64 if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
65 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
66 if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
78 static void id3v2_put_size(AVFormatContext *s, int size)
80 avio_w8(s->pb, size >> 21 & 0x7f);
81 avio_w8(s->pb, size >> 14 & 0x7f);
82 avio_w8(s->pb, size >> 7 & 0x7f);
83 avio_w8(s->pb, size & 0x7f);
86 static int string_is_ascii(const uint8_t *str)
88 while (*str && *str < 128) str++;
93 * Write a text frame with one (normal frames) or two (TXXX frames) strings
94 * according to encoding (only UTF-8 or UTF-16+BOM supported).
95 * @return number of bytes written or a negative error code.
97 static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
98 uint32_t tag, enum ID3v2Encoding enc)
102 int (*put)(AVIOContext*, const char*);
103 AVIOContext *dyn_buf;
104 if (avio_open_dyn_buf(&dyn_buf) < 0)
105 return AVERROR(ENOMEM);
107 /* check if the strings are ASCII-only and use UTF16 only if
109 if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
110 (!str2 || string_is_ascii(str2)))
111 enc = ID3v2_ENCODING_ISO8859;
113 avio_w8(dyn_buf, enc);
114 if (enc == ID3v2_ENCODING_UTF16BOM) {
115 avio_wl16(dyn_buf, 0xFEFF); /* BOM */
116 put = avio_put_str16le;
123 len = avio_close_dyn_buf(dyn_buf, &pb);
125 avio_wb32(s->pb, tag);
126 id3v2_put_size(s, len);
128 avio_write(s->pb, pb, len);
131 return len + ID3v2_HEADER_SIZE;
134 static int mp2_write_trailer(struct AVFormatContext *s)
136 uint8_t buf[ID3v1_TAG_SIZE];
138 /* write the id3v1 tag */
139 if (id3v1_create_tag(s, buf) > 0) {
140 avio_write(s->pb, buf, ID3v1_TAG_SIZE);
147 AVOutputFormat ff_mp2_muxer = {
149 NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
162 #define VBR_NUM_BAGS 400
163 #define VBR_TOC_SIZE 100
164 typedef struct MP3Context {
165 const AVClass *class;
167 int64_t frames_offset;
173 uint64_t bag[VBR_NUM_BAGS];
176 static const AVOption options[] = {
177 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
178 offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, {.dbl = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
182 static const AVClass mp3_muxer_class = {
183 .class_name = "MP3 muxer",
184 .item_name = av_default_item_name,
186 .version = LIBAVUTIL_VERSION_INT,
189 static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4],
190 enum ID3v2Encoding enc)
195 if (t->key[0] != 'T' || strlen(t->key) != 4)
197 tag = AV_RB32(t->key);
198 for (i = 0; *table[i]; i++)
199 if (tag == AV_RB32(table[i]))
200 return id3v2_put_ttag(s, t->value, NULL, tag, enc);
204 static const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
207 * Write an empty XING header and initialize respective data.
209 static int mp3_write_xing(AVFormatContext *s)
211 AVCodecContext *codec = s->streams[0]->codec;
212 MP3Context *mp3 = s->priv_data;
215 int32_t mask, header;
217 int srate_idx, i, channels;
220 for (i = 0; i < FF_ARRAY_ELEMS(ff_mpa_freq_tab); i++)
221 if (ff_mpa_freq_tab[i] == codec->sample_rate) {
225 if (i == FF_ARRAY_ELEMS(ff_mpa_freq_tab)) {
226 av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
230 switch (codec->channels) {
231 case 1: channels = MPA_MONO; break;
232 case 2: channels = MPA_STEREO; break;
233 default: av_log(s, AV_LOG_ERROR, "Unsupported number of channels.\n"); return -1;
236 /* dummy MPEG audio header */
237 header = 0xff << 24; // sync
238 header |= (0x7 << 5 | 0x3 << 3 | 0x1 << 1 | 0x1) << 16; // sync/mpeg-1/layer 3/no crc*/
239 header |= (srate_idx << 2) << 8;
240 header |= channels << 6;
243 if (15 == bitrate_idx)
246 mask = (bitrate_idx << 4) << 8;
248 ff_mpegaudio_decode_header(&c, header);
249 xing_offset=xing_offtbl[c.lsf == 1][c.nb_channels == 1];
253 + 4 // frames/size/toc flags
256 + VBR_TOC_SIZE; // toc
258 if (needed <= c.frame_size)
265 avio_wb32(s->pb, header);
266 ffio_fill(s->pb, 0, xing_offset);
267 avio_wb32(s->pb, MKBETAG('X', 'i', 'n', 'g'));
268 avio_wb32(s->pb, 0x01 | 0x02 | 0x04); // frames/size/toc
270 mp3->frames_offset = avio_tell(s->pb);
271 mp3->size = c.frame_size;
276 avio_wb32(s->pb, 0); // frames
277 avio_wb32(s->pb, 0); // size
280 for (i = 0; i < VBR_TOC_SIZE; ++i)
281 avio_w8(s->pb, (uint8_t)(255 * i / VBR_TOC_SIZE));
283 ffio_fill(s->pb, 0, c.frame_size - needed);
290 * Add a frame to XING data.
291 * Following lame's "VbrTag.c".
293 static void mp3_xing_add_frame(AVFormatContext *s, AVPacket *pkt)
295 MP3Context *mp3 = s->priv_data;
299 mp3->size += pkt->size;
301 if (mp3->want == ++mp3->seen) {
302 mp3->bag[mp3->pos] = mp3->size;
304 if (VBR_NUM_BAGS == ++mp3->pos) {
305 /* shrink table to half size by throwing away each second bag. */
306 for (i = 1; i < VBR_NUM_BAGS; i += 2)
307 mp3->bag[i >> 1] = mp3->bag[i];
309 /* double wanted amount per bag. */
311 /* adjust current position to half of table size. */
319 static void mp3_fix_xing(AVFormatContext *s)
321 MP3Context *mp3 = s->priv_data;
325 avio_seek(s->pb, mp3->frames_offset, SEEK_SET);
326 avio_wb32(s->pb, mp3->frames);
327 avio_wb32(s->pb, mp3->size);
329 avio_w8(s->pb, 0); // first toc entry has to be zero.
331 for (i = 1; i < VBR_TOC_SIZE; ++i) {
332 int j = i * mp3->pos / VBR_TOC_SIZE;
333 int seek_point = 256LL * mp3->bag[j] / mp3->size;
334 avio_w8(s->pb, FFMIN(seek_point, 255));
338 avio_seek(s->pb, 0, SEEK_END);
342 * Write an ID3v2 header at beginning of stream
345 static int mp3_write_header(struct AVFormatContext *s)
347 MP3Context *mp3 = s->priv_data;
348 AVMetadataTag *t = NULL;
349 int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
351 int64_t size_pos, cur_pos;
353 avio_wb32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version));
355 avio_w8(s->pb, 0); /* flags */
357 /* reserve space for size */
358 size_pos = avio_tell(s->pb);
361 ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
362 if (mp3->id3v2_version == 4)
363 ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
365 while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
368 if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
372 if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ?
373 ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
378 /* unknown tag, write as TXXX frame */
379 if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
384 cur_pos = avio_tell(s->pb);
385 avio_seek(s->pb, size_pos, SEEK_SET);
386 id3v2_put_size(s, totlen);
387 avio_seek(s->pb, cur_pos, SEEK_SET);
395 static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
397 if (! pkt || ! pkt->data || pkt->size < 4)
398 return ff_raw_write_packet(s, pkt);
400 MP3Context *mp3 = s->priv_data;
401 #ifdef FILTER_VBR_HEADERS
405 ff_mpegaudio_decode_header(&c, AV_RB32(pkt->data));
407 /* filter out XING and INFO headers. */
408 base = 4 + xing_offtbl[c.lsf == 1][c.nb_channels == 1];
410 if (base + 4 <= pkt->size) {
411 uint32_t v = AV_RB32(pkt->data + base);
413 if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v)
417 /* filter out VBRI headers. */
420 if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base))
424 if (mp3->frames_offset)
425 mp3_xing_add_frame(s, pkt);
427 return ff_raw_write_packet(s, pkt);
431 static int mp3_write_trailer(AVFormatContext *s)
433 MP3Context *mp3 = s->priv_data;
434 int ret=mp2_write_trailer(s);
439 if (mp3->frames_offset)
445 AVOutputFormat ff_mp3_muxer = {
447 NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
457 .priv_class = &mp3_muxer_class,