Split mp3 demuxer and muxer into separate files.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 194 insertions, 0 deletions

diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
new file mode 100644
index 0000000000..b4fb876814
--- /dev/null
+++ b/libavformat/mp3enc.c
@@ -0,0 +1,194 @@
+/*
+ * MP3 muxer
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <strings.h>
+#include "avformat.h"
+#include "id3v1.h"
+#include "id3v2.h"
+#include "libavutil/intreadwrite.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);
+    return !!tag;
+}
+
+static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
+{
+    AVMetadataTag *tag;
+    int i, count = 0;
+
+    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
+    buf[0] = 'T';
+    buf[1] = 'A';
+    buf[2] = 'G';
+    count += id3v1_set_string(s, "TIT2",    buf +  3, 30);       //title
+    count += id3v1_set_string(s, "TPE1",    buf + 33, 30);       //author|artist
+    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
+        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
+        for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
+            if (!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)
+{
+    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 *buf, int len,
+                           uint32_t tag)
+{
+    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, buf, len);
+}
+
+
+static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
+{
+    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[ID3v1_TAG_SIZE];
+
+    /* write the id3v1 tag */
+    if (id3v1_create_tag(s, buf) > 0) {
+        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
+        put_flush_packet(s->pb);
+    }
+    return 0;
+}
+
+#if CONFIG_MP2_MUXER
+AVOutputFormat mp2_muxer = {
+    "mp2",
+    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
+    "audio/x-mpeg",
+    "mp2,m2a",
+    0,
+    CODEC_ID_MP2,
+    CODEC_ID_NONE,
+    NULL,
+    mp3_write_packet,
+    mp3_write_trailer,
+};
+#endif
+
+#if CONFIG_MP3_MUXER
+/**
+ * Write an ID3v2.4 header at beginning of stream
+ */
+
+static int mp3_write_header(struct AVFormatContext *s)
+{
+    AVMetadataTag *t = NULL;
+    int totlen = 0;
+    int64_t size_pos, cur_pos;
+
+    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
+    put_byte(s->pb, 0);
+    put_byte(s->pb, 0); /* flags */
+
+    /* reserve space for size */
+    size_pos = url_ftell(s->pb);
+    put_be32(s->pb, 0);
+
+    ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
+    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
+        uint32_t tag = 0;
+
+        if (t->key[0] == 'T' && strlen(t->key) == 4) {
+            int i;
+            for (i = 0; *ff_id3v2_tags[i]; i++)
+                if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
+                    int len = strlen(t->value);
+                    tag = AV_RB32(t->key);
+                    totlen += len + ID3v2_HEADER_SIZE + 2;
+                    id3v2_put_ttag(s, t->value, len + 1, tag);
+                    break;
+                }
+        }
+
+        if (!tag) { /* unknown tag, write as TXXX frame */
+            int   len = strlen(t->key), len1 = strlen(t->value);
+            char *buf = av_malloc(len + len1 + 2);
+            if (!buf)
+                return AVERROR(ENOMEM);
+            tag = MKBETAG('T', 'X', 'X', 'X');
+            strcpy(buf,           t->key);
+            strcpy(buf + len + 1, t->value);
+            id3v2_put_ttag(s, buf, len + len1 + 2, tag);
+            totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
+            av_free(buf);
+        }
+    }
+
+    cur_pos = url_ftell(s->pb);
+    url_fseek(s->pb, size_pos, SEEK_SET);
+    id3v2_put_size(s, totlen);
+    url_fseek(s->pb, cur_pos, SEEK_SET);
+
+    return 0;
+}
+
+AVOutputFormat mp3_muxer = {
+    "mp3",
+    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
+    "audio/x-mpeg",
+    "mp3",
+    0,
+    CODEC_ID_MP3,
+    CODEC_ID_NONE,
+    mp3_write_header,
+    mp3_write_packet,
+    mp3_write_trailer,
+    AVFMT_NOTIMESTAMPS,
+};
+#endif