30 #define _XOPEN_SOURCE 600
33 #include <libavcodec/avcodec.h>
34 #include <libavformat/avformat.h>
35 #include <libavfilter/avfiltergraph.h>
36 #include <libavfilter/avcodec.h>
37 #include <libavfilter/buffersink.h>
38 #include <libavfilter/buffersrc.h>
98 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
104 args, NULL, filter_graph);
114 NULL, buffersink_params, filter_graph);
125 outputs->
next = NULL;
133 &inputs, &outputs, NULL)) < 0)
153 if (delay > 0 && delay < 1000000)
162 for (y = 0; y < frame->
height; y++) {
164 for (x = 0; x < frame->
width; x++)
165 putchar(
" .-+#"[*(p++) / 52]);
172 int main(
int argc,
char **argv)
180 if (!frame || !filt_frame) {
181 perror(
"Could not allocate frame");
185 fprintf(stderr,
"Usage: %s file\n", argv[0]);
246 fprintf(stderr,
"Error occurred: %s\n", buf);
AVFilterContext * buffersrc_ctx
int av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
Get a frame with filtered data from sink and put it in frame.
void av_free_packet(AVPacket *pkt)
Free a packet.
This structure describes decoded (raw) audio or video data.
static const AVFilterPad outputs[]
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
char * av_strdup(const char *s) av_malloc_attrib
Duplicate the string s.
AVBufferSinkParams * av_buffersink_params_alloc(void)
Create an AVBufferSinkParams structure.
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
Check validity and configure all the links and formats in the graph.
AVCodecContext * codec
Codec context associated with this stream.
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
AVFilterContext * filter_ctx
filter context associated to this input/output
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
static AVFormatContext * fmt_ctx
static const char * filter_descr
static av_cold int end(AVCodecContext *avctx)
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
void avfilter_register_all(void)
Initialize the filter system.
int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx)
Create and add a filter instance into an existing graph.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const
Rescale a 64-bit integer by 2 rational numbers.
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
int width
width and height of the video frame
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link...
static void display_frame(const AVFrame *frame, AVRational time_base)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
AVPixelFormat
Pixel format.
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
int width
picture width / height.
Struct to use for initializing a buffersink context.
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
char * name
unique name for this input/output in the list
A linked-list of the inputs/outputs of the filter chain.
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
enum AVPixelFormat * pixel_fmts
list of allowed pixel formats, terminated by AV_PIX_FMT_NONE
AVFilterGraph * filter_graph
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Keep a reference to the frame.
main external API structure.
static int video_stream_index
void avcodec_get_frame_defaults(AVFrame *frame)
Set the fields of the given AVFrame to default values.
static const AVFilterPad inputs[]
int pad_idx
index of the filt_ctx pad to use for linking
AVFilterLink ** inputs
array of pointers to input links
rational number numerator/denominator
AVFilterContext * buffersink_ctx
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame)
Accessors for some AVFrame fields.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
struct AVFilterInOut * next
next input/input in the list, NULL if this is the last
static int open_input_file(const char *filename)
int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs, void *log_ctx)
Add a graph described by a string to a graph.
static int init_filters(const char *filters_descr)
int main(int argc, char **argv)
static AVCodecContext * dec_ctx
This structure stores compressed data.
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src, AVFrame *frame, int flags)
Add a frame to the buffer source.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
#define AV_NOPTS_VALUE
Undefined timestamp value.