42 while(p[offset] ==
' ' || p[offset] ==
'\t') {
45 if(p[offset] ==
'[' && p[offset + 1] >=
'a' && p[offset + 1] <=
'z') {
58 if(p[offset] ==
' ' || p[offset] ==
'\t') {
60 }
else if(p[offset] ==
'[') {
63 }
else if (p[offset] ==
']' && in_brackets) {
66 }
else if(in_brackets &&
67 (p[offset] ==
':' || p[offset] ==
'.' || p[offset] ==
'-' ||
68 (p[offset] >=
'0' && p[offset] <=
'9'))) {
77 static int64_t
read_ts(
const char *p, int64_t *start)
82 while(p[offset] ==
' ' || p[offset] ==
'\t') {
85 if(p[offset] !=
'[') {
88 if(sscanf(p,
"[-%"SCNu64
":%"SCNu64
".%"SCNu64
"]", &mm, &ss, &cs) == 3) {
90 *start = -(int64_t) (mm*60000 + ss*1000 + cs*10);
91 }
else if(sscanf(p,
"[%"SCNu64
":%"SCNu64
".%"SCNu64
"]", &mm, &ss, &cs) == 3) {
92 *start = mm*60000 + ss*1000 + cs*10;
98 }
while(p[offset] && p[offset-1] !=
']');
126 if(!memcmp(p->
buf,
"\xef\xbb\xbf", 3)) {
129 while(p->
buf[offset] ==
'\n' || p->
buf[offset] ==
'\r') {
132 if(p->
buf[offset] !=
'[') {
137 if(!memcmp(p->
buf + offset,
"offset:", 7)) {
140 if(sscanf(p->
buf + offset,
"%"SCNd64
":%"SCNu64
".%"SCNu64
"]",
141 &mm, &ss, &cs) == 3) {
146 metadata_item->
native; metadata_item++) {
147 size_t metadata_item_len = strlen(metadata_item->
native);
148 if(p->
buf[offset + metadata_item_len] ==
':' &&
149 !memcmp(p->
buf + offset, metadata_item->
native, metadata_item_len)) {
175 if(header_offset >= 0) {
176 char *comma_offset = strchr(line.str,
':');
178 char *right_bracket_offset = strchr(line.str,
']');
179 if(!right_bracket_offset) {
183 *right_bracket_offset = *comma_offset =
'\0';
184 if(strcmp(line.str + 1,
"offset") ||
185 sscanf(comma_offset + 1,
"%"SCNd64, &lrc->
ts_offset) != 1) {
191 *right_bracket_offset =
']';
197 int64_t ts_stroffset = 0;
198 int64_t ts_stroffset_incr = 0;
199 int64_t ts_strlength =
count_ts(line.str);
201 while((ts_stroffset_incr =
read_ts(line.str + ts_stroffset,
203 ts_start =
av_clip64(ts_start, INT64_MIN/4, INT64_MAX/4);
204 ts_stroffset += ts_stroffset_incr;
206 line.len - ts_strlength, 0);
230 int64_t min_ts, int64_t ts, int64_t max_ts,
int flags)
234 min_ts, ts, max_ts, flags);
static int64_t count_ts(const char *p)
AVInputFormat ff_lrc_demuxer
int64_t pos
byte position in stream, -1 if unknown
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
static int64_t read_ts(const char *p, int64_t *start)
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
static av_cold int read_close(AVFormatContext *ctx)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
AVDictionary * metadata
Metadata that applies to the whole file.
static int lrc_read_close(AVFormatContext *s)
#define AV_BPRINT_SIZE_UNLIMITED
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
enum AVMediaType codec_type
General type of the encoded data.
int avio_r8(AVIOContext *s)
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
#define ss(width, name, subs,...)
const AVMetadataConv ff_lrc_metadata_conv[]
static int read_header(FFV1Context *f)
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Update current_sub_idx to emulate a seek.
AVIOContext * pb
I/O context.
static int64_t find_header(const char *p)
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
static int64_t read_line(AVBPrint *buf, AVIOContext *pb)
static int lrc_read_header(AVFormatContext *s)
This structure contains the data a format has to probe a file.
#define flags(name, subs,...)
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
static int lrc_read_packet(AVFormatContext *s, AVPacket *pkt)
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
void * priv_data
Format private data.
static int lrc_probe(const AVProbeData *p)
static float sub(float src0, float src1)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
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
This structure stores compressed data.
void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events...
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
#define AV_NOPTS_VALUE
Undefined timestamp value.
static int lrc_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.