30 #define WEBVTT_STACK_SIZE 64 42 __attribute__ ((__format__ (__printf__, 2, 3)))
174 #if FF_API_ASS_TIMING 175 if (!strncmp(ass,
"Dialogue: ", 10)) {
179 for (; dialog && num--; dialog++) {
191 #if FF_API_ASS_TIMING 201 if (s->
buffer.len > bufsize) {
AVCodec ff_webvtt_encoder
char * style
name of the ASSStyle to use with this dialog
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
char stack[WEBVTT_STACK_SIZE]
fields extracted from the [Events] section
static int webvtt_encode_frame(AVCodecContext *avctx, unsigned char *buf, int bufsize, const AVSubtitle *sub)
static void webvtt_stack_push_pop(WebVTTContext *s, const char c, int close)
static av_cold int init(AVCodecContext *avctx)
ASSDialog * ff_ass_split_dialog2(ASSSplitContext *ctx, const char *buf)
Split one ASS Dialogue line from a string buffer.
ASSSplitContext * ff_ass_split(const char *buf)
Split a full ASS file or a ASS header from a string buffer and store the split structure in a newly a...
static void webvtt_style_cb(void *priv, char style, int close)
static void webvtt_print(WebVTTContext *s, const char *str,...)
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
static void webvtt_cancel_overrides_cb(void *priv, const char *style)
char * text
actual text which will be displayed as a subtitle, can include style override control codes (see ff_a...
This struct can be casted to ASS to access to the split data.
void ff_ass_free_dialog(ASSDialog **dialogp)
Free a dialogue obtained from ff_ass_split_dialog2().
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
int bold
whether text is bold (1) or not (0)
int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv, const char *buf)
Split override codes out of a ASS "Dialogue" Text field.
void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
Append data to a print buffer.
ASSDialog * ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf, int cache, int *number)
Split one or several ASS "Dialogue" lines from a string buffer and store them in an already initializ...
static void webvtt_end_cb(void *priv)
#define ASS_DEFAULT_UNDERLINE
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#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)
const char * name
Name of the codec implementation.
static int webvtt_stack_push(WebVTTContext *s, const char c)
static av_cold int webvtt_encode_init(AVCodecContext *avctx)
static void webvtt_text_cb(void *priv, const char *text, int len)
#define AVERROR_BUFFER_TOO_SMALL
Buffer too small.
int italic
whether text is italic (1) or not (0)
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Set of callback functions corresponding to each override codes that can be encountered in a "Dialogue...
static void webvtt_close_tag(WebVTTContext *s, char tag)
static void webvtt_new_line_cb(void *priv, int forced)
static char webvtt_stack_pop(WebVTTContext *s)
Libavcodec external API header.
static int webvtt_encode_close(AVCodecContext *avctx)
main external API structure.
void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
Append a formatted string to a print buffer.
fields extracted from the [V4(+) Styles] section
ASSSplitContext * ass_ctx
static void webvtt_style_apply(WebVTTContext *s, const char *style)
ASSStyle * ff_ass_style_get(ASSSplitContext *ctx, const char *style)
Find an ASSStyle structure by its name.
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
void(* text)(void *priv, const char *text, int len)
Formatted text, the ass field must be set by the decoder and is authoritative.
#define ASS_DEFAULT_ITALIC
char * ass
0 terminated ASS/SSA compatible event line.
void ff_ass_split_free(ASSSplitContext *ctx)
Free all the memory allocated for an ASSSplitContext.
#define WEBVTT_STACK_SIZE
static float sub(float src0, float src1)
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
static int webvtt_stack_find(WebVTTContext *s, const char c)
int underline
whether text is underlined (1) or not (0)
static const ASSCodesCallbacks webvtt_callbacks
uint8_t * subtitle_header
Header containing style information for text subtitles.