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34 {
"ALBUMARTIST",
"album_artist"},
35 {
"TRACKNUMBER",
"track" },
36 {
"DISCNUMBER",
"disc" },
37 {
"DESCRIPTION",
"comment" },
42 AVChapter **chapters,
unsigned int nb_chapters)
45 len += strlen(vendor_string);
46 if (chapters && nb_chapters) {
47 for (
int i = 0;
i < nb_chapters;
i++) {
49 len += 4 + 12 + 1 + 10;
51 int64_t len1 = !strcmp(
tag->key,
"title") ? 4 : strlen(
tag->key);
52 len += 4 + 10 + len1 + 1 + strlen(
tag->value);
59 len += 4 +strlen(
tag->key) + 1 + strlen(
tag->value);
66 const char *vendor_string,
67 AVChapter **chapters,
unsigned int nb_chapters)
69 size_t vendor_string_length = strlen(vendor_string);
72 avio_write(pb, vendor_string, vendor_string_length);
73 if (chapters && nb_chapters) {
74 for (
int i = 0;
i < nb_chapters;
i++) {
83 int64_t len1 = strlen(
tag->key);
84 int64_t len2 = strlen(
tag->value);
85 if (len1+1+len2 > UINT32_MAX)
92 for (
int i = 0;
i < nb_chapters;
i++) {
94 char chapter_time[13];
95 char chapter_number[4];
103 snprintf(chapter_number,
sizeof(chapter_number),
"%03d",
i);
104 snprintf(chapter_time,
sizeof(chapter_time),
"%02d:%02d:%02d.%03d",
h, m,
s, ms);
113 int64_t len1 = !strcmp(
tag->key,
"title") ? 4 : strlen(
tag->key);
114 int64_t len2 = strlen(
tag->value);
115 if (len1+1+len2+10 > UINT32_MAX)
120 if (!strcmp(
tag->key,
"title"))
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
int av_dict_count(const AVDictionary *m)
Get number of entries in dictionary.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
void avio_w8(AVIOContext *s, int b)
static AVRational av_make_q(int num, int den)
Create an AVRational.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
void avio_wl32(AVIOContext *s, unsigned int val)
#define i(width, name, range_min, range_max)
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
AVRational time_base
time base in which the start/end timestamps are specified
const AVDictionaryEntry * av_dict_iterate(const AVDictionary *m, const AVDictionaryEntry *prev)
Iterate over a dictionary.