/*
- * MP3 encoder and decoder
+ * MP3 muxer and demuxer
* Copyright (c) 2003 Fabrice Bellard.
*
* This file is part of FFmpeg.
*/
#include "avformat.h"
#include "mpegaudio.h"
+#include "avstring.h"
+#include "mpegaudiodecheader.h"
-#define ID3_HEADER_SIZE 10
-#define ID3_TAG_SIZE 128
+#define ID3v2_HEADER_SIZE 10
+#define ID3v1_TAG_SIZE 128
-#define ID3_GENRE_MAX 125
+#define ID3v1_GENRE_MAX 125
-static const char *id3_genre_str[ID3_GENRE_MAX + 1] = {
+static const char *id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
[0] = "Blues",
[1] = "Classic Rock",
[2] = "Country",
[125] = "Dance Hall",
};
-/* buf must be ID3_HEADER_SIZE byte long */
-static int id3_match(const uint8_t *buf)
+/* buf must be ID3v2_HEADER_SIZE byte long */
+static int id3v2_match(const uint8_t *buf)
{
return (buf[0] == 'I' &&
buf[1] == 'D' &&
(buf[9] & 0x80) == 0);
}
-static void id3_get_string(char *str, int str_size,
- const uint8_t *buf, int buf_size)
+static unsigned int id3v2_get_size(ByteIOContext *s, int len)
+{
+ int v=0;
+ while(len--)
+ v= (v<<7) + (get_byte(s)&0x7F);
+ return v;
+}
+
+static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
+{
+ char *q;
+ int len;
+
+ if(taglen < 1)
+ return;
+
+ taglen--; /* account for encoding type byte */
+ dstlen--; /* Leave space for zero terminator */
+
+ switch(get_byte(s->pb)) { /* encoding type */
+
+ case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
+ q = dst;
+ while(taglen--) {
+ uint8_t tmp;
+ PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
+ }
+ *q = '\0';
+ break;
+
+ case 3: /* UTF-8 */
+ len = FFMIN(taglen, dstlen);
+ get_buffer(s->pb, dst, len);
+ dst[len] = 0;
+ break;
+ }
+}
+
+/**
+ * ID3v2 parser
+ *
+ * Handles ID3v2.2, 2.3 and 2.4.
+ *
+ */
+
+static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
+{
+ int isv34, tlen;
+ uint32_t tag;
+ offset_t next;
+ char tmp[16];
+ int taghdrlen;
+ const char *reason;
+
+ switch(version) {
+ case 2:
+ if(flags & 0x40) {
+ reason = "compression";
+ goto error;
+ }
+ isv34 = 0;
+ taghdrlen = 6;
+ break;
+
+ case 3:
+ case 4:
+ isv34 = 1;
+ taghdrlen = 10;
+ break;
+
+ default:
+ reason = "version";
+ goto error;
+ }
+
+ if(flags & 0x80) {
+ reason = "unsynchronization";
+ goto error;
+ }
+
+ if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
+ url_fskip(s->pb, id3v2_get_size(s->pb, 4));
+
+ while(len >= taghdrlen) {
+ if(isv34) {
+ tag = get_be32(s->pb);
+ tlen = id3v2_get_size(s->pb, 4);
+ get_be16(s->pb); /* flags */
+ } else {
+ tag = get_be24(s->pb);
+ tlen = id3v2_get_size(s->pb, 3);
+ }
+ len -= taghdrlen + tlen;
+
+ if(len < 0)
+ break;
+
+ next = url_ftell(s->pb) + tlen;
+
+ switch(tag) {
+ case MKBETAG('T', 'I', 'T', '2'):
+ case MKBETAG(0, 'T', 'T', '2'):
+ id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
+ break;
+ case MKBETAG('T', 'P', 'E', '1'):
+ case MKBETAG(0, 'T', 'P', '1'):
+ id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
+ break;
+ case MKBETAG('T', 'A', 'L', 'B'):
+ case MKBETAG(0, 'T', 'A', 'L'):
+ id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
+ break;
+ case MKBETAG('T', 'C', 'O', 'N'):
+ case MKBETAG(0, 'T', 'C', 'O'):
+ id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
+ break;
+ case MKBETAG('T', 'C', 'O', 'P'):
+ case MKBETAG(0, 'T', 'C', 'R'):
+ id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
+ break;
+ case MKBETAG('T', 'R', 'C', 'K'):
+ case MKBETAG(0, 'T', 'R', 'K'):
+ id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
+ s->track = atoi(tmp);
+ break;
+ case 0:
+ /* padding, skip to end */
+ url_fskip(s->pb, len);
+ len = 0;
+ continue;
+ }
+ /* Skip to end of tag */
+ url_fseek(s->pb, next, SEEK_SET);
+ }
+
+ if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
+ url_fskip(s->pb, 10);
+ return;
+
+ error:
+ av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
+ url_fskip(s->pb, len);
+}
+
+static void id3v1_get_string(char *str, int str_size,
+ const uint8_t *buf, int buf_size)
{
int i, c;
char *q;
*q = '\0';
}
-/* 'buf' must be ID3_TAG_SIZE byte long */
-static int id3_parse_tag(AVFormatContext *s, const uint8_t *buf)
+/* 'buf' must be ID3v1_TAG_SIZE byte long */
+static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
{
char str[5];
int genre;
buf[1] == 'A' &&
buf[2] == 'G'))
return -1;
- id3_get_string(s->title, sizeof(s->title), buf + 3, 30);
- id3_get_string(s->author, sizeof(s->author), buf + 33, 30);
- id3_get_string(s->album, sizeof(s->album), buf + 63, 30);
- id3_get_string(str, sizeof(str), buf + 93, 4);
+ id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
+ id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
+ id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
+ id3v1_get_string(str, sizeof(str), buf + 93, 4);
s->year = atoi(str);
- id3_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
+ id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
if (buf[125] == 0 && buf[126] != 0)
s->track = buf[126];
genre = buf[127];
- if (genre <= ID3_GENRE_MAX)
- pstrcpy(s->genre, sizeof(s->genre), id3_genre_str[genre]);
+ if (genre <= ID3v1_GENRE_MAX)
+ av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
return 0;
}
-static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
+static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
{
int v, i;
- memset(buf, 0, ID3_TAG_SIZE); /* fail safe */
+ memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
buf[0] = 'T';
buf[1] = 'A';
buf[2] = 'G';
buf[125] = 0;
buf[126] = s->track;
}
- for(i = 0; i <= ID3_GENRE_MAX; i++) {
- if (!strcasecmp(s->genre, id3_genre_str[i])) {
+ for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
+ if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
buf[127] = i;
break;
}
static int mp3_read_probe(AVProbeData *p)
{
- int max_frames, first_frames;
- int fsize, frames;
+ int max_frames, first_frames = 0;
+ int fsize, frames, sample_rate;
uint32_t header;
uint8_t *buf, *buf2, *end;
AVCodecContext avctx;
- if(p->buf_size < ID3_HEADER_SIZE)
- return 0;
-
- if(id3_match(p->buf))
- return AVPROBE_SCORE_MAX;
+ if(id3v2_match(p->buf))
+ return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
max_frames = 0;
buf = p->buf;
- end = buf + FFMIN(4096, p->buf_size - sizeof(uint32_t));
+ end = buf + p->buf_size - sizeof(uint32_t);
- for(; buf < end; buf++) {
+ for(; buf < end; buf= buf2+1) {
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
- header = (buf2[0] << 24) | (buf2[1] << 16) | (buf2[2] << 8) | buf2[3];
- fsize = mpa_decode_header(&avctx, header);
+ header = AV_RB32(buf2);
+ fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
if(fsize < 0)
break;
buf2 += fsize;
first_frames= frames;
}
if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
+ else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
else if(max_frames>=1) return 1;
else return 0;
}
+/**
+ * Try to find Xing/Info/VBRI tags and compute duration from info therein
+ */
+static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
+{
+ uint32_t v, spf;
+ int frames = -1; /* Total number of frames in file */
+ const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
+ MPADecodeContext c;
+
+ v = get_be32(s->pb);
+ if(ff_mpa_check_header(v) < 0)
+ return;
+
+ ff_mpegaudio_decode_header(&c, v);
+ if(c.layer != 3)
+ return;
+
+ /* Check for Xing / Info tag */
+ url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
+ v = get_be32(s->pb);
+ if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
+ v = get_be32(s->pb);
+ if(v & 0x1)
+ frames = get_be32(s->pb);
+ }
+
+ /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
+ url_fseek(s->pb, base + 4 + 32, SEEK_SET);
+ v = get_be32(s->pb);
+ if(v == MKBETAG('V', 'B', 'R', 'I')) {
+ /* Check tag version */
+ if(get_be16(s->pb) == 1) {
+ /* skip delay, quality and total bytes */
+ url_fseek(s->pb, 8, SEEK_CUR);
+ frames = get_be32(s->pb);
+ }
+ }
+
+ if(frames < 0)
+ return;
+
+ spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
+ st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
+ st->time_base);
+}
+
static int mp3_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
- uint8_t buf[ID3_TAG_SIZE];
+ uint8_t buf[ID3v1_TAG_SIZE];
int len, ret, filesize;
+ offset_t off;
st = av_new_stream(s, 0);
if (!st)
- return AVERROR_NOMEM;
+ return AVERROR(ENOMEM);
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_MP3;
- st->need_parsing = 1;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
+ st->start_time = 0;
/* try to get the TAG */
- if (!url_is_streamed(&s->pb)) {
+ if (!url_is_streamed(s->pb)) {
/* XXX: change that */
- filesize = url_fsize(&s->pb);
+ filesize = url_fsize(s->pb);
if (filesize > 128) {
- url_fseek(&s->pb, filesize - 128, SEEK_SET);
- ret = get_buffer(&s->pb, buf, ID3_TAG_SIZE);
- if (ret == ID3_TAG_SIZE) {
- id3_parse_tag(s, buf);
+ url_fseek(s->pb, filesize - 128, SEEK_SET);
+ ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
+ if (ret == ID3v1_TAG_SIZE) {
+ id3v1_parse_tag(s, buf);
}
- url_fseek(&s->pb, 0, SEEK_SET);
+ url_fseek(s->pb, 0, SEEK_SET);
}
}
- /* if ID3 header found, skip it */
- ret = get_buffer(&s->pb, buf, ID3_HEADER_SIZE);
- if (ret != ID3_HEADER_SIZE)
+ /* if ID3v2 header found, skip it */
+ ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
+ if (ret != ID3v2_HEADER_SIZE)
return -1;
- if (id3_match(buf)) {
- /* skip ID3 header */
+ if (id3v2_match(buf)) {
+ /* parse ID3v2 header */
len = ((buf[6] & 0x7f) << 21) |
((buf[7] & 0x7f) << 14) |
((buf[8] & 0x7f) << 7) |
(buf[9] & 0x7f);
- url_fskip(&s->pb, len);
+ id3v2_parse(s, len, buf[3], buf[5]);
} else {
- url_fseek(&s->pb, 0, SEEK_SET);
+ url_fseek(s->pb, 0, SEEK_SET);
}
+ off = url_ftell(s->pb);
+ mp3_parse_vbr_tags(s, st, off);
+ url_fseek(s->pb, off, SEEK_SET);
+
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
size= MP3_PACKET_SIZE;
- ret= av_get_packet(&s->pb, pkt, size);
+ ret= av_get_packet(s->pb, pkt, size);
pkt->stream_index = 0;
if (ret <= 0) {
- return AVERROR_IO;
+ return AVERROR(EIO);
}
/* note: we need to modify the packet size here to handle the last
packet */
#ifdef CONFIG_MUXERS
/* simple formats */
+
+static void id3v2_put_size(AVFormatContext *s, int size)
+{
+ put_byte(s->pb, size >> 21 & 0x7f);
+ put_byte(s->pb, size >> 14 & 0x7f);
+ put_byte(s->pb, size >> 7 & 0x7f);
+ put_byte(s->pb, size & 0x7f);
+}
+
+static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag)
+{
+ int len = strlen(string);
+ put_be32(s->pb, tag);
+ id3v2_put_size(s, len + 1);
+ put_be16(s->pb, 0);
+ put_byte(s->pb, 3); /* UTF-8 */
+ put_buffer(s->pb, string, len);
+}
+
+
+/**
+ * Write an ID3v2.4 header at beginning of stream
+ */
+
static int mp3_write_header(struct AVFormatContext *s)
{
+ int totlen = 0;
+ char tracktxt[10];
+ char yeartxt[10];
+
+ if(s->track)
+ snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
+ if(s->year)
+ snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
+
+ if(s->title[0]) totlen += 11 + strlen(s->title);
+ if(s->author[0]) totlen += 11 + strlen(s->author);
+ if(s->album[0]) totlen += 11 + strlen(s->album);
+ if(s->genre[0]) totlen += 11 + strlen(s->genre);
+ if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
+ if(s->track) totlen += 11 + strlen(tracktxt);
+ if(s->year) totlen += 11 + strlen(yeartxt);
+ if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
+ totlen += strlen(LIBAVFORMAT_IDENT) + 11;
+
+ if(totlen == 0)
+ return 0;
+
+ put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
+ put_byte(s->pb, 0);
+ put_byte(s->pb, 0); /* flags */
+
+ id3v2_put_size(s, totlen);
+
+ if(s->title[0]) id3v2_put_ttag(s, s->title, MKBETAG('T', 'I', 'T', '2'));
+ if(s->author[0]) id3v2_put_ttag(s, s->author, MKBETAG('T', 'P', 'E', '1'));
+ if(s->album[0]) id3v2_put_ttag(s, s->album, MKBETAG('T', 'A', 'L', 'B'));
+ if(s->genre[0]) id3v2_put_ttag(s, s->genre, MKBETAG('T', 'C', 'O', 'N'));
+ if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
+ if(s->track) id3v2_put_ttag(s, tracktxt, MKBETAG('T', 'R', 'C', 'K'));
+ if(s->year) id3v2_put_ttag(s, yeartxt, MKBETAG('T', 'Y', 'E', 'R'));
+ if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
+ id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
return 0;
}
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
- put_buffer(&s->pb, pkt->data, pkt->size);
- put_flush_packet(&s->pb);
+ put_buffer(s->pb, pkt->data, pkt->size);
+ put_flush_packet(s->pb);
return 0;
}
static int mp3_write_trailer(struct AVFormatContext *s)
{
- uint8_t buf[ID3_TAG_SIZE];
+ uint8_t buf[ID3v1_TAG_SIZE];
- /* write the id3 header */
+ /* write the id3v1 tag */
if (s->title[0] != '\0') {
- id3_create_tag(s, buf);
- put_buffer(&s->pb, buf, ID3_TAG_SIZE);
- put_flush_packet(&s->pb);
+ id3v1_create_tag(s, buf);
+ put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
+ put_flush_packet(s->pb);
}
return 0;
}
mp3_read_header,
mp3_read_packet,
mp3_read_close,
+ .flags= AVFMT_GENERIC_INDEX,
.extensions = "mp2,mp3,m2a", /* XXX: use probe */
};
#endif
"mp2",
"MPEG audio layer 2",
"audio/x-mpeg",
-#ifdef CONFIG_MP3LAME
+#ifdef CONFIG_LIBMP3LAME
"mp2,m2a",
#else
"mp2,mp3,m2a",
0,
CODEC_ID_MP2,
0,
- mp3_write_header,
+ NULL,
mp3_write_packet,
mp3_write_trailer,
};
projects / ffmpeg / blobdiff