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98 "for stream #%u\n",
i);
266 if (!buffersrc || !buffersink) {
273 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
304 if (!buffersrc || !buffersink) {
314 "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=%s",
397 const char *filter_spec;
414 filter_spec =
"null";
416 filter_spec =
"anull";
516 if (!(
stream_ctx[stream_index].enc_ctx->codec->capabilities &
524 int main(
int argc,
char **argv)
528 unsigned int stream_index;
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
static AVCodecContext * dec_ctx
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
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
enum AVMediaType codec_type
General type of the encoded data.
int sample_rate
samples per second
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static StreamContext * stream_ctx
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
This structure describes decoded (raw) audio or video data.
static AVFormatContext * ofmt_ctx
AVStream ** streams
A list of all streams in the file.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
int avio_open(AVIOContext **s, const char *filename, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
void(* filter)(uint8_t *src, int stride, int qscale)
enum AVChannelOrder order
Channel order used in this layout.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
int nb_channels
Number of channels in this layout.
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
#define AV_CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
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)
Create and add a filter instance into an existing graph.
AVChannelLayout ch_layout
Audio channel layout.
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
static FilteringContext * filter_ctx
int flags
AV_CODEC_FLAG_*.
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
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.
void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)
Print detailed information about the input or output format, such as duration, bitrate,...
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
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...
AVRational av_buffersink_get_time_base(const AVFilterContext *ctx)
#define AVIO_FLAG_WRITE
write-only
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
AVFilterContext * buffersrc_ctx
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.
int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Rational number (pair of numerator and denominator).
AVIOContext * pb
I/O context.
void(* flush)(AVBSFContext *ctx)
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
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
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
int64_t best_effort_timestamp
frame timestamp estimated using various heuristics, in stream time base
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
static AVFormatContext * ifmt_ctx
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
enum AVSampleFormat sample_fmt
audio sample format
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed.
#define AV_NOPTS_VALUE
Undefined timestamp value.
AVRational time_base
Time base for the timestamps in this frame.
@ AVMEDIA_TYPE_UNKNOWN
Usually treated as AVMEDIA_TYPE_DATA.
@ AV_PICTURE_TYPE_NONE
Undefined.
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another.
#define AV_LOG_INFO
Standard information.
AVFilterContext * buffersink_ctx
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
static int flush_encoder(unsigned int stream_index)
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
#define i(width, name, range_min, range_max)
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_filter(FilteringContext *fctx, AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, const char *filter_spec)
static int encode_write_frame(unsigned int stream_index, int flush)
int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
Add a frame to the buffer source.
#define av_malloc_array(a, b)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
const char * name
Name of the codec implementation.
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
const char * name
Pad name.
static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
void * av_calloc(size_t nmemb, size_t size)
static const AVFilterPad outputs[]
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *frame)
Guess the frame rate, based on both the container and codec information.
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
const struct AVOutputFormat * oformat
The output container format.
main external API structure.
static int init_filters(void)
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
#define AVERROR_DECODER_NOT_FOUND
Decoder not found.
enum AVMediaType codec_type
char * av_strdup(const char *s)
Duplicate a string.
int main(int argc, char **argv)
int avcodec_parameters_from_context(struct AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
AVFilterGraph * filter_graph
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file ensuring correct interleaving.
AVFilterContext * buffersink_ctx
int width
picture width / height.
static int open_output_file(const char *filename)
static int open_input_file(const char *filename)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
A linked-list of the inputs/outputs of the filter chain.
AVFilterGraph * filter_graph
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
AVFilterContext * buffersrc_ctx