36 #define LINE_DATA_SIZE 9 53 #define OFFSET(x) offsetof(ReadVitcContext, x) 54 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 68 crc = 0x01 | (line[0] << 2);
69 crc ^= (line[0] >> 6) | 0x04 | (line[1] << 4);
70 crc ^= (line[1] >> 4) | 0x10 | (line[2] << 6);
71 crc ^= (line[2] >> 2) | 0x40;
73 crc ^= 0x01 | (line[4] << 2);
74 crc ^= (line[4] >> 6) | 0x04 | (line[5] << 4);
75 crc ^= (line[5] >> 4) | 0x10 | (line[6] << 6);
76 crc ^= (line[6] >> 2) | 0x40;
79 crc = (crc >> 2) | (crc << 6);
84 return ((line[i-1] + line[i] + line[i+1]) / 3);
90 int grp_index, pit_index;
99 for (y = 0; y <
height; y++) {
104 while ((x < width) && (grp_index < 9)) {
112 if ((grp_start_pos + ctx->
grp_width) > width)
117 x = grp_start_pos + ((ctx->
grp_width) / 10);
121 for (pit_index = 0; pit_index <= 7; pit_index++) {
122 x = grp_start_pos + (((pit_index+2)*ctx->
grp_width) / 10);
125 ctx->
line_data[grp_index] |= (1 << pit_index);
141 if (high > 9 || low > 9)
143 return 10*high + low;
148 unsigned hh =
bcd2uint(line[7] & 0x03, line[6] & 0x0f);
149 unsigned mm =
bcd2uint(line[5] & 0x07, line[4] & 0x0f);
150 unsigned ss =
bcd2uint(line[3] & 0x07, line[2] & 0x0f);
151 unsigned ff =
bcd2uint(line[1] & 0x03, line[0] & 0x0f);
152 unsigned drop = (line[1] & 0x04);
154 hh, mm, ss, drop ?
';' :
':', ff);
165 av_log(ctx,
AV_LOG_WARNING,
"Black color threshold is higher than white color threshold (%g > %g)\n",
170 av_log(ctx,
AV_LOG_DEBUG,
"threshold_black:%d threshold_white:%d threshold_gray:%d\n",
251 .description =
NULL_IF_CONFIG_SMALL(
"Read vertical interval timecode and write it to frame metadata."),
253 .priv_class = &readvitc_class,
This structure describes decoded (raw) audio or video data.
static int query_formats(AVFilterContext *ctx)
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
#define AV_LOG_WARNING
Something somehow does not look correct.
Main libavfilter public API header.
static unsigned bcd2uint(uint8_t high, uint8_t low)
int h
agreed upon image height
static uint8_t get_pit_avg3(uint8_t *line, int i)
static uint8_t get_vitc_crc(uint8_t *line)
const char * name
Pad name.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range...
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
AVDictionary * metadata
metadata.
static char * make_vitc_tc_string(char *buf, uint8_t *line)
A filter pad used for either input or output.
A link between two filters.
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void * priv
private data for use by the filter
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
static const AVOption readvitc_options[]
AVFILTER_DEFINE_CLASS(readvitc)
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
int w
agreed upon image width
common internal API header
as above, but U and V bytes are swapped
#define ss(width, name, subs,...)
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
char tcbuf[AV_TIMECODE_STR_SIZE]
uint8_t line_data[LINE_DATA_SIZE]
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
static const AVFilterPad inputs[]
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Describe the class of an AVClass context structure.
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
const char * name
Filter name.
AVFilterLink ** outputs
array of pointers to output links
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static av_cold int init(AVFilterContext *ctx)
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
common internal and external API header
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
interleaved chroma YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
static int read_vitc_line(ReadVitcContext *ctx, uint8_t *src, int line_size, int width, int height)
static int config_props(AVFilterLink *inlink)
AVFilterContext * dst
dest filter
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
static const AVFilterPad outputs[]
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
AVPixelFormat
Pixel format.
#define AV_TIMECODE_STR_SIZE