* MP3 muxer
* Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <strings.h>
#include "avformat.h"
+#include "avio_internal.h"
#include "id3v1.h"
#include "id3v2.h"
#include "rawenc.h"
+#include "libavutil/avstring.h"
+#include "libavcodec/mpegaudio.h"
+#include "libavcodec/mpegaudiodata.h"
+#include "libavcodec/mpegaudiodecheader.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
+#include "libavutil/dict.h"
static int id3v1_set_string(AVFormatContext *s, const char *key,
uint8_t *buf, int buf_size)
{
- AVMetadataTag *tag;
- if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
- strncpy(buf, tag->value, buf_size);
+ AVDictionaryEntry *tag;
+ if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
+ av_strlcpy(buf, tag->value, buf_size);
return !!tag;
}
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
{
- AVMetadataTag *tag;
+ AVDictionaryEntry *tag;
int i, count = 0;
memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
count += id3v1_set_string(s, "comment", buf + 97, 30);
- if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
+ if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
buf[125] = 0;
buf[126] = atoi(tag->value);
count++;
}
buf[127] = 0xFF; /* default to unknown genre */
- if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
+ if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
- if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
+ if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
buf[127] = i;
count++;
break;
return count;
}
-/* simple formats */
-
-static void id3v2_put_size(AVFormatContext *s, int size)
-{
- avio_w8(s->pb, size >> 21 & 0x7f);
- avio_w8(s->pb, size >> 14 & 0x7f);
- avio_w8(s->pb, size >> 7 & 0x7f);
- avio_w8(s->pb, size & 0x7f);
-}
-
-static int string_is_ascii(const uint8_t *str)
-{
- while (*str && *str < 128) str++;
- return !*str;
-}
-
-/**
- * Write a text frame with one (normal frames) or two (TXXX frames) strings
- * according to encoding (only UTF-8 or UTF-16+BOM supported).
- * @return number of bytes written or a negative error code.
- */
-static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
- uint32_t tag, enum ID3v2Encoding enc)
-{
- int len;
- uint8_t *pb;
- int (*put)(AVIOContext*, const char*);
- AVIOContext *dyn_buf;
- if (url_open_dyn_buf(&dyn_buf) < 0)
- return AVERROR(ENOMEM);
-
- /* check if the strings are ASCII-only and use UTF16 only if
- * they're not */
- if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
- (!str2 || string_is_ascii(str2)))
- enc = ID3v2_ENCODING_ISO8859;
-
- avio_w8(dyn_buf, enc);
- if (enc == ID3v2_ENCODING_UTF16BOM) {
- avio_wl16(dyn_buf, 0xFEFF); /* BOM */
- put = avio_put_str16le;
- } else
- put = avio_put_str;
-
- put(dyn_buf, str1);
- if (str2)
- put(dyn_buf, str2);
- len = url_close_dyn_buf(dyn_buf, &pb);
-
- avio_wb32(s->pb, tag);
- id3v2_put_size(s, len);
- avio_wb16(s->pb, 0);
- avio_write(s->pb, pb, len);
-
- av_freep(&pb);
- return len + ID3v2_HEADER_SIZE;
-}
+typedef struct MP3Context {
+ const AVClass *class;
+ int id3v2_version;
+ int write_id3v1;
+ int64_t nb_frames_offset;
+} MP3Context;
static int mp3_write_trailer(struct AVFormatContext *s)
{
uint8_t buf[ID3v1_TAG_SIZE];
+ MP3Context *mp3 = s->priv_data;
/* write the id3v1 tag */
- if (id3v1_create_tag(s, buf) > 0) {
+ if (mp3 && mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
avio_write(s->pb, buf, ID3v1_TAG_SIZE);
- avio_flush(s->pb);
}
+
+ /* write number of frames */
+ if (mp3 && mp3->nb_frames_offset) {
+ avio_seek(s->pb, mp3->nb_frames_offset, SEEK_SET);
+ avio_wb32(s->pb, s->streams[0]->nb_frames);
+ avio_seek(s->pb, 0, SEEK_END);
+ }
+
+ avio_flush(s->pb);
+
return 0;
}
#if CONFIG_MP2_MUXER
AVOutputFormat ff_mp2_muxer = {
- "mp2",
- NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
- "audio/x-mpeg",
- "mp2,m2a",
- 0,
- CODEC_ID_MP2,
- CODEC_ID_NONE,
- NULL,
- ff_raw_write_packet,
- mp3_write_trailer,
+ .name = "mp2",
+ .long_name = NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
+ .mime_type = "audio/x-mpeg",
+ .extensions = "mp2,m2a",
+ .audio_codec = CODEC_ID_MP2,
+ .video_codec = CODEC_ID_NONE,
+ .write_packet = ff_raw_write_packet,
+ .write_trailer = mp3_write_trailer,
};
#endif
#if CONFIG_MP3_MUXER
-typedef struct MP3Context {
- const AVClass *class;
- int id3v2_version;
-} MP3Context;
static const AVOption options[] = {
{ "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
- offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, 4, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
+ offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.dbl = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
+ { "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
+ offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
{ NULL },
};
static const AVClass mp3_muxer_class = {
- "MP3 muxer",
- av_default_item_name,
- options,
- LIBAVUTIL_VERSION_INT,
+ .class_name = "MP3 muxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
};
-static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4],
- enum ID3v2Encoding enc)
+/* insert a dummy frame containing number of frames */
+static void mp3_write_xing(AVFormatContext *s)
{
- uint32_t tag;
- int i;
-
- if (t->key[0] != 'T' || strlen(t->key) != 4)
- return -1;
- tag = AV_RB32(t->key);
- for (i = 0; *table[i]; i++)
- if (tag == AV_RB32(table[i]))
- return id3v2_put_ttag(s, t->value, NULL, tag, enc);
- return -1;
+ AVCodecContext *codec = s->streams[0]->codec;
+ MP3Context *mp3 = s->priv_data;
+ int bitrate_idx = 1; // 32 kbps
+ int64_t xing_offset = (codec->channels == 2) ? 32 : 17;
+ int32_t header;
+ MPADecodeHeader mpah;
+ int srate_idx, i, channels;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++)
+ if (avpriv_mpa_freq_tab[i] == codec->sample_rate) {
+ srate_idx = i;
+ break;
+ }
+ if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
+ av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
+ return;
+ }
+
+ switch (codec->channels) {
+ case 1: channels = MPA_MONO; break;
+ case 2: channels = MPA_STEREO; break;
+ default: av_log(s, AV_LOG_ERROR, "Unsupported number of channels.\n"); return;
+ }
+
+ /* dummy MPEG audio header */
+ header = 0xff << 24; // sync
+ header |= (0x7 << 5 | 0x3 << 3 | 0x1 << 1 | 0x1) << 16; // sync/mpeg-1/layer 3/no crc*/
+ header |= (bitrate_idx << 4 | srate_idx << 2) << 8;
+ header |= channels << 6;
+ avio_wb32(s->pb, header);
+
+ avpriv_mpegaudio_decode_header(&mpah, header);
+
+ ffio_fill(s->pb, 0, xing_offset);
+ ffio_wfourcc(s->pb, "Xing");
+ avio_wb32(s->pb, 0x1); // only number of frames
+ mp3->nb_frames_offset = avio_tell(s->pb);
+ avio_wb32(s->pb, 0);
+
+ mpah.frame_size -= 4 + xing_offset + 4 + 4 + 4;
+ ffio_fill(s->pb, 0, mpah.frame_size);
}
/**
static int mp3_write_header(struct AVFormatContext *s)
{
MP3Context *mp3 = s->priv_data;
- AVMetadataTag *t = NULL;
- int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
- ID3v2_ENCODING_UTF8;
- int64_t size_pos, cur_pos;
-
- avio_wb32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version));
- avio_w8(s->pb, 0);
- avio_w8(s->pb, 0); /* flags */
-
- /* reserve space for size */
- size_pos = avio_tell(s->pb);
- avio_wb32(s->pb, 0);
-
- ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
- if (mp3->id3v2_version == 4)
- ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
+ int ret;
- while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
- int ret;
-
- if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
- totlen += ret;
- continue;
- }
- if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ?
- ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
- totlen += ret;
- continue;
- }
-
- /* unknown tag, write as TXXX frame */
- if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
- return ret;
- totlen += ret;
- }
+ ret = ff_id3v2_write(s, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
+ if (ret < 0)
+ return ret;
- cur_pos = avio_tell(s->pb);
- avio_seek(s->pb, size_pos, SEEK_SET);
- id3v2_put_size(s, totlen);
- avio_seek(s->pb, cur_pos, SEEK_SET);
+ if (s->pb->seekable)
+ mp3_write_xing(s);
return 0;
}
AVOutputFormat ff_mp3_muxer = {
- "mp3",
- NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
- "audio/x-mpeg",
- "mp3",
- sizeof(MP3Context),
- CODEC_ID_MP3,
- CODEC_ID_NONE,
- mp3_write_header,
- ff_raw_write_packet,
- mp3_write_trailer,
- AVFMT_NOTIMESTAMPS,
+ .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,
+ .write_packet = ff_raw_write_packet,
+ .write_trailer = mp3_write_trailer,
+ .flags = AVFMT_NOTIMESTAMPS,
.priv_class = &mp3_muxer_class,
};
#endif
projects / ffmpeg / blobdiff