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FFmpeg/libavformat/id3v2enc.c
Andreas Rheinhardt c1e439d7e9 avformat: Forward errors where possible 
It is not uncommon to find code where the caller thinks to know better
what the return value should be than the callee. E.g. something like
"if (av_new_packet(pkt, size) < 0) return AVERROR(ENOMEM);". This commit
changes several instances of this to instead forward the actual error.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-12-12 19:25:33 +01:00

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/*
* 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 "avio_internal.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, ret;
uint8_t *pb;
AVIOContext *dyn_buf;
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
/* 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_get_dyn_buf(dyn_buf, &pb);
avio_wb32(avioc, tag);
/* ID3v2.3 frame size is not sync-safe */
if (id3->version == 3)
avio_wb32(avioc, len);
else
id3v2_put_size(avioc, len);
avio_wb16(avioc, 0);
avio_write(avioc, pb, len);
ffio_free_dyn_buf(&dyn_buf);
return len + ID3v2_HEADER_SIZE;
}
/**
* Write a priv frame with owner and data. 'key' is the owner prepended with
* ID3v2_PRIV_METADATA_PREFIX. 'data' is provided as a string. Any \xXX
* (where 'X' is a valid hex digit) will be unescaped to the byte value.
*/
static int id3v2_put_priv(ID3v2EncContext *id3, AVIOContext *avioc, const char *key, const char *data)
{
int len, ret;
uint8_t *pb;
AVIOContext *dyn_buf;
if (!av_strstart(key, ID3v2_PRIV_METADATA_PREFIX, &key)) {
return 0;
}
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
// owner + null byte.
avio_write(dyn_buf, key, strlen(key) + 1);
while (*data) {
if (av_strstart(data, "\\x", &data)) {
if (data[0] && data[1] && av_isxdigit(data[0]) && av_isxdigit(data[1])) {
char digits[] = {data[0], data[1], 0};
avio_w8(dyn_buf, strtol(digits, NULL, 16));
data += 2;
} else {
ffio_free_dyn_buf(&dyn_buf);
av_log(avioc, AV_LOG_ERROR, "Invalid escape '\\x%.2s' in metadata tag '"
ID3v2_PRIV_METADATA_PREFIX "%s'.\n", data, key);
return AVERROR(EINVAL);
}
} else {
avio_write(dyn_buf, data++, 1);
}
}
len = avio_get_dyn_buf(dyn_buf, &pb);
avio_wb32(avioc, MKBETAG('P', 'R', 'I', 'V'));
if (id3->version == 3)
avio_wb32(avioc, len);
else
id3v2_put_size(avioc, len);
avio_wb16(avioc, 0);
avio_write(avioc, pb, len);
ffio_free_dyn_buf(&dyn_buf);
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);
}
static int write_metadata(AVIOContext *pb, AVDictionary **metadata,
ID3v2EncContext *id3, int enc)
{
AVDictionaryEntry *t = NULL;
int ret;
ff_metadata_conv(metadata, ff_id3v2_34_metadata_conv, NULL);
if (id3->version == 3)
id3v2_3_metadata_split_date(metadata);
else if (id3->version == 4)
ff_metadata_conv(metadata, ff_id3v2_4_metadata_conv, NULL);
while ((t = av_dict_get(*metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
if ((ret = id3v2_check_write_tag(id3, pb, t, ff_id3v2_tags, enc)) > 0) {
id3->len += ret;
continue;
}
if ((ret = id3v2_check_write_tag(id3, pb, t, id3->version == 3 ?
ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
id3->len += ret;
continue;
}
if ((ret = id3v2_put_priv(id3, pb, t->key, t->value)) > 0) {
id3->len += ret;
continue;
} else if (ret < 0) {
return ret;
}
/* unknown tag, write as TXXX frame */
if ((ret = id3v2_put_ttag(id3, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
return ret;
id3->len += ret;
}
return 0;
}
static int write_ctoc(AVFormatContext *s, ID3v2EncContext *id3, int enc)
{
uint8_t *dyn_buf;
AVIOContext *dyn_bc;
char name[123];
int len, ret;
if (s->nb_chapters == 0)
return 0;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
id3->len += avio_put_str(dyn_bc, "toc");
avio_w8(dyn_bc, 0x03);
avio_w8(dyn_bc, s->nb_chapters);
for (int i = 0; i < s->nb_chapters; i++) {
snprintf(name, 122, "ch%d", i);
id3->len += avio_put_str(dyn_bc, name);
}
len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
id3->len += 16 + ID3v2_HEADER_SIZE;
avio_wb32(s->pb, MKBETAG('C', 'T', 'O', 'C'));
avio_wb32(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, dyn_buf, len);
ffio_free_dyn_buf(&dyn_bc);
return ret;
}
static int write_chapter(AVFormatContext *s, ID3v2EncContext *id3, int id, int enc)
{
const AVRational time_base = {1, 1000};
AVChapter *ch = s->chapters[id];
uint8_t *dyn_buf;
AVIOContext *dyn_bc;
char name[123];
int len, start, end, ret;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
start = av_rescale_q(ch->start, ch->time_base, time_base);
end = av_rescale_q(ch->end, ch->time_base, time_base);
snprintf(name, 122, "ch%d", id);
id3->len += avio_put_str(dyn_bc, name);
avio_wb32(dyn_bc, start);
avio_wb32(dyn_bc, end);
avio_wb32(dyn_bc, 0xFFFFFFFFu);
avio_wb32(dyn_bc, 0xFFFFFFFFu);
if ((ret = write_metadata(dyn_bc, &ch->metadata, id3, enc)) < 0)
goto fail;
len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
id3->len += 16 + ID3v2_HEADER_SIZE;
avio_wb32(s->pb, MKBETAG('C', 'H', 'A', 'P'));
avio_wb32(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, dyn_buf, len);
fail:
ffio_free_dyn_buf(&dyn_bc);
return ret;
}
int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
{
int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
ID3v2_ENCODING_UTF8;
int i, ret;
ff_standardize_creation_time(s);
if ((ret = write_metadata(s->pb, &s->metadata, id3, enc)) < 0)
return ret;
if ((ret = write_ctoc(s, id3, enc)) < 0)
return ret;
for (i = 0; i < s->nb_chapters; i++) {
if ((ret = write_chapter(s, id3, i, enc)) < 0)
return 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, ret;
/* get the mimetype*/
while (mime->id != AV_CODEC_ID_NONE) {
if (mime->id == st->codecpar->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 (!av_strcasecmp(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;
/* use UTF16 only for non-ASCII strings */
if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(desc))
enc = ID3v2_ENCODING_ISO8859;
/* start writing */
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
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_get_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);
ffio_free_dyn_buf(&dyn_buf);
id3->len += len + ID3v2_HEADER_SIZE;
return 0;
}
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb,
int padding_bytes)
{
int64_t cur_pos;
if (padding_bytes < 0)
padding_bytes = 10;
/* The ID3v2.3 specification states that 28 bits are used to represent the
* size of the whole tag. Therefore the current size of the tag needs to be
* subtracted from the upper limit of 2^28-1 to clip the value correctly. */
/* The minimum of 10 is an arbitrary amount of padding at the end of the tag
* to fix cover art display with some software such as iTunes, Traktor,
* Serato, Torq. */
padding_bytes = av_clip(padding_bytes, 10, 268435455 - id3->len);
ffio_fill(pb, 0, padding_bytes);
id3->len += padding_bytes;
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, s->metadata_header_padding);
return 0;
}
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