making act segmenter

1 files changed, 284 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/id3v2enc.c b/ffmpeg/libavformat/id3v2enc.c
new file mode 100644
index 0000000..a10d679
--- /dev/null
+++ b/ffmpeg/libavformat/id3v2enc.c
@@ -0,0 +1,284 @@
+/*
+ * ID3v2 header writer
+ *
+ * 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 <stdint.h>
+#include <string.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/dict.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "avio.h"
+#include "id3v2.h"
+
+static void id3v2_put_size(AVIOContext *pb, int size)
+{
+    avio_w8(pb, size >> 21 & 0x7f);
+    avio_w8(pb, size >> 14 & 0x7f);
+    avio_w8(pb, size >> 7  & 0x7f);
+    avio_w8(pb, size       & 0x7f);
+}
+
+static int string_is_ascii(const uint8_t *str)
+{
+    while (*str && *str < 128) str++;
+    return !*str;
+}
+
+static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
+                               enum ID3v2Encoding enc)
+{
+    int (*put)(AVIOContext*, const char*);
+
+    if (enc == ID3v2_ENCODING_UTF16BOM) {
+        avio_wl16(pb, 0xFEFF);      /* BOM */
+        put = avio_put_str16le;
+    } else
+        put = avio_put_str;
+
+    put(pb, 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(ID3v2EncContext *id3, AVIOContext *avioc, const char *str1, const char *str2,
+                          uint32_t tag, enum ID3v2Encoding enc)
+{
+    int len;
+    uint8_t *pb;
+    AVIOContext *dyn_buf;
+    if (avio_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);
+    id3v2_encode_string(dyn_buf, str1, enc);
+    if (str2)
+        id3v2_encode_string(dyn_buf, str2, enc);
+    len = avio_close_dyn_buf(dyn_buf, &pb);
+
+    avio_wb32(avioc, tag);
+    /* ID3v2.3 frame size is not synchsafe */
+    if (id3->version == 3)
+        avio_wb32(avioc, len);
+    else
+        id3v2_put_size(avioc, len);
+    avio_wb16(avioc, 0);
+    avio_write(avioc, pb, len);
+
+    av_freep(&pb);
+    return len + ID3v2_HEADER_SIZE;
+}
+
+static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
+                                 const char table[][4], enum ID3v2Encoding enc)
+{
+    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(id3, pb, t->value, NULL, tag, enc);
+    return -1;
+}
+
+static void id3v2_3_metadata_split_date(AVDictionary **pm)
+{
+    AVDictionaryEntry *mtag = NULL;
+    AVDictionary *dst = NULL;
+    const char *key, *value;
+    char year[5] = {0}, day_month[5] = {0};
+    int i;
+
+    while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
+        key = mtag->key;
+        if (!av_strcasecmp(key, "date")) {
+            /* split date tag using "YYYY-MM-DD" format into year and month/day segments */
+            value = mtag->value;
+            i = 0;
+            while (value[i] >= '0' && value[i] <= '9') i++;
+            if (value[i] == '\0' || value[i] == '-') {
+                av_strlcpy(year, value, sizeof(year));
+                av_dict_set(&dst, "TYER", year, 0);
+
+                if (value[i] == '-' &&
+                    value[i+1] >= '0' && value[i+1] <= '1' &&
+                    value[i+2] >= '0' && value[i+2] <= '9' &&
+                    value[i+3] == '-' &&
+                    value[i+4] >= '0' && value[i+4] <= '3' &&
+                    value[i+5] >= '0' && value[i+5] <= '9' &&
+                    (value[i+6] == '\0' || value[i+6] == ' ')) {
+                    snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1);
+                    av_dict_set(&dst, "TDAT", day_month, 0);
+                }
+            } else
+                av_dict_set(&dst, key, value, 0);
+        } else
+            av_dict_set(&dst, key, mtag->value, 0);
+    }
+    av_dict_free(pm);
+    *pm = dst;
+}
+
+void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
+                    const char *magic)
+{
+    id3->version = id3v2_version;
+
+    avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
+    avio_w8(pb, 0);
+    avio_w8(pb, 0); /* flags */
+
+    /* reserve space for size */
+    id3->size_pos = avio_tell(pb);
+    avio_wb32(pb, 0);
+}
+
+int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
+{
+    AVDictionaryEntry *t = NULL;
+    int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
+                                  ID3v2_ENCODING_UTF8;
+
+    ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
+    if (id3->version == 3)
+        id3v2_3_metadata_split_date(&s->metadata);
+    else if (id3->version == 4)
+        ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
+
+    while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        int ret;
+
+        if ((ret = id3v2_check_write_tag(id3, s->pb, t, ff_id3v2_tags, enc)) > 0) {
+            id3->len += ret;
+            continue;
+        }
+        if ((ret = id3v2_check_write_tag(id3, s->pb, t, id3->version == 3 ?
+                                               ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
+            id3->len += ret;
+            continue;
+        }
+
+        /* unknown tag, write as TXXX frame */
+        if ((ret = id3v2_put_ttag(id3, s->pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
+            return ret;
+        id3->len += ret;
+    }
+
+    return 0;
+}
+
+int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
+{
+    AVStream *st = s->streams[pkt->stream_index];
+    AVDictionaryEntry *e;
+
+    AVIOContext *dyn_buf;
+    uint8_t     *buf;
+    const CodecMime *mime = ff_id3v2_mime_tags;
+    const char  *mimetype = NULL, *desc = "";
+    int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
+                                  ID3v2_ENCODING_UTF8;
+    int i, len, type = 0;
+
+    /* get the mimetype*/
+    while (mime->id != AV_CODEC_ID_NONE) {
+        if (mime->id == st->codec->codec_id) {
+            mimetype = mime->str;
+            break;
+        }
+        mime++;
+    }
+    if (!mimetype) {
+        av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
+               "write an attached picture.\n", st->index);
+        return AVERROR(EINVAL);
+    }
+
+    /* get the picture type */
+    e = av_dict_get(st->metadata, "comment", NULL, 0);
+    for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
+        if (strstr(ff_id3v2_picture_types[i], e->value) == ff_id3v2_picture_types[i]) {
+            type = i;
+            break;
+        }
+    }
+
+    /* get the description */
+    if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
+        desc = e->value;
+
+    /* start writing */
+    if (avio_open_dyn_buf(&dyn_buf) < 0)
+        return AVERROR(ENOMEM);
+
+    avio_w8(dyn_buf, enc);
+    avio_put_str(dyn_buf, mimetype);
+    avio_w8(dyn_buf, type);
+    id3v2_encode_string(dyn_buf, desc, enc);
+    avio_write(dyn_buf, pkt->data, pkt->size);
+    len = avio_close_dyn_buf(dyn_buf, &buf);
+
+    avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
+    if (id3->version == 3)
+        avio_wb32(s->pb, len);
+    else
+        id3v2_put_size(s->pb, len);
+    avio_wb16(s->pb, 0);
+    avio_write(s->pb, buf, len);
+    av_freep(&buf);
+
+    id3->len += len + ID3v2_HEADER_SIZE;
+
+    return 0;
+}
+
+void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb)
+{
+    int64_t cur_pos = avio_tell(pb);
+    avio_seek(pb, id3->size_pos, SEEK_SET);
+    id3v2_put_size(pb, id3->len);
+    avio_seek(pb, cur_pos, SEEK_SET);
+}
+
+int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version,
+                          const char *magic)
+{
+    ID3v2EncContext id3 = { 0 };
+    int ret;
+
+    ff_id3v2_start(&id3, s->pb, id3v2_version, magic);
+    if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0)
+        return ret;
+    ff_id3v2_finish(&id3, s->pb);
+
+    return 0;
+}