#define _XOPEN_SOURCE 600
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
{
}
}
}
}
return 0;
}
{
char args[512];
goto end;
}
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
goto end;
}
goto end;
}
goto end;
}
goto end;
}
goto end;
goto end;
end:
}
{
int x, y;
uint8_t *p0, *p;
if (delay > 0 && delay < 1000000)
usleep(delay);
}
}
puts("\033c");
for (y = 0; y <
frame->height; y++) {
p = p0;
for (x = 0; x <
frame->width; x++)
putchar(" .-+#"[*(p++) / 52]);
putchar('\n');
p0 +=
frame->linesize[0];
}
fflush(stdout);
}
int main(
int argc,
char **argv)
{
if (argc != 2) {
fprintf(stderr, "Usage: %s file\n", argv[0]);
exit(1);
}
if (!
frame || !filt_frame || !packet) {
fprintf(stderr, "Could not allocate frame or packet\n");
exit(1);
}
goto end;
goto end;
while (1) {
break;
break;
}
break;
goto end;
}
break;
}
while (1) {
break;
goto end;
}
}
}
}
goto end;
}
while (1) {
break;
goto end;
}
}
end:
exit(1);
}
exit(0);
}
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
static AVFormatContext * fmt_ctx
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
#define AVERROR_EOF
End of file.
const char * filter_descr
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
This structure describes decoded (raw) audio or video data.
AVStream ** streams
A list of all streams in the file.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx)
A convenience wrapper that allocates and initializes a filter in a single step.
AVFilterContext * avfilter_graph_alloc_filter(AVFilterGraph *graph, const AVFilter *filter, const char *name)
Create a new filter instance in a filter graph.
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
AVFilterGraph * filter_graph
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
int main(int argc, char **argv)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
void avfilter_inout_free(AVFilterInOut **inout)
Free the supplied list of AVFilterInOut and set *inout to NULL.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
static int open_input_file(const char *filename)
int attribute_align_arg av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
Get a frame with filtered data from sink and put it in frame.
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
static int video_stream_index
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
Check validity and configure all the links and formats in the graph.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
static AVCodecContext * dec_ctx
Rational number (pair of numerator and denominator).
AVFilterLink ** inputs
array of pointers to input links
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
static void display_frame(const AVFrame *frame, AVRational time_base)
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
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 inputs
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
static int init_filters(const char *filters_descr)
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
#define AV_NOPTS_VALUE
Undefined timestamp value.
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
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.
int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
Add a frame to the buffer source.
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
const char * name
Pad name.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static const AVFilterPad outputs[]
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
AVFilterContext * buffersrc_ctx
main external API structure.
int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
Initialize a filter with the supplied dictionary of options.
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link.
char * av_strdup(const char *s)
Duplicate a string.
This structure stores compressed data.
int width
picture width / height.
AVFilterContext * buffersink_ctx
A linked-list of the inputs/outputs of the filter chain.
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.