ffmpeg source update for sep 09

source/patched-ffmpeg-mt/libavfilter/avfilter.h

 /*
  * filter layer
  * copyright (c) 2007 Bobby Bingham
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVFILTER_AVFILTER_H
 #define AVFILTER_AVFILTER_H
 
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  1
-#define LIBAVFILTER_VERSION_MINOR 31
-#define LIBAVFILTER_VERSION_MICRO  0
+#define LIBAVFILTER_VERSION_MINOR 38
+#define LIBAVFILTER_VERSION_MICRO  3
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
                                                LIBAVFILTER_VERSION_MICRO)
 #define LIBAVFILTER_VERSION     AV_VERSION(LIBAVFILTER_VERSION_MAJOR,   \
                                            LIBAVFILTER_VERSION_MINOR,   \
                                            LIBAVFILTER_VERSION_MICRO)
 #define LIBAVFILTER_BUILD       LIBAVFILTER_VERSION_INT
 
 #include <stddef.h>
@@ skipping 17 matching lines @@
 
 typedef struct AVFilterContext AVFilterContext;
 typedef struct AVFilterLink    AVFilterLink;
 typedef struct AVFilterPad     AVFilterPad;
 
 /**
  * A reference-counted buffer data type used by the filter system. Filters
  * should not store pointers to this structure directly, but instead use the
  * AVFilterBufferRef structure below.
  */
-typedef struct AVFilterBuffer
-{
+typedef struct AVFilterBuffer {
     uint8_t *data[8];           ///< buffer data for each plane/channel
     int linesize[8];            ///< number of bytes per line
 
     unsigned refcount;          ///< number of references to this buffer
 
     /** private data to be used by a custom free function */
     void *priv;
     /**
      * A pointer to the function to deallocate this buffer if the default
      * function is not sufficient. This could, for example, add the memory
      * back into a memory pool to be reused later without the overhead of
      * reallocating it from scratch.
      */
     void (*free)(struct AVFilterBuffer *buf);
 } AVFilterBuffer;
 
 #define AV_PERM_READ     0x01   ///< can read from the buffer
 #define AV_PERM_WRITE    0x02   ///< can write to the buffer
 #define AV_PERM_PRESERVE 0x04   ///< nobody else can overwrite the buffer
 #define AV_PERM_REUSE    0x08   ///< can output the buffer multiple times, with the same contents each time
 #define AV_PERM_REUSE2   0x10   ///< can output the buffer multiple times, modified each time
 
 /**
+ * Audio specific properties in a reference to an AVFilterBuffer. Since
+ * AVFilterBufferRef is common to different media formats, audio specific
+ * per reference properties must be separated out.
+ */
+typedef struct AVFilterBufferRefAudioProps {
+    int64_t channel_layout;     ///< channel layout of audio buffer
+    int samples_nb;             ///< number of audio samples
+    int size;                   ///< audio buffer size
+    uint32_t sample_rate;       ///< audio buffer sample rate
+    int planar;                 ///< audio buffer - planar or packed
+} AVFilterBufferRefAudioProps;
+
+/**
+ * Video specific properties in a reference to an AVFilterBuffer. Since
+ * AVFilterBufferRef is common to different media formats, video specific
+ * per reference properties must be separated out.
+ */
+typedef struct AVFilterBufferRefVideoProps {
+    int w;                      ///< image width
+    int h;                      ///< image height
+    AVRational pixel_aspect;    ///< pixel aspect ratio
+    int interlaced;             ///< is frame interlaced
+    int top_field_first;        ///< field order
+} AVFilterBufferRefVideoProps;
+
+/**
  * A reference to an AVFilterBuffer. Since filters can manipulate the origin of
  * a buffer to, for example, crop image without any memcpy, the buffer origin
  * and dimensions are per-reference properties. Linesize is also useful for
  * image flipping, frame to field filters, etc, and so is also per-reference.
  *
  * TODO: add anything necessary for frame reordering
  */
-typedef struct AVFilterBufferRef
-{
+typedef struct AVFilterBufferRef {
     AVFilterBuffer *buf;        ///< the buffer that this is a reference to
-    uint8_t *data[4];           ///< picture data for each plane
-    int linesize[4];            ///< number of bytes per line
-    int w;                      ///< image width
-    int h;                      ///< image height
+    uint8_t *data[8];           ///< picture/audio data for each plane
+    int linesize[8];            ///< number of bytes per line
     int format;                 ///< media format
 
     int64_t pts;                ///< presentation timestamp in units of 1/AV_TIME_BASE
     int64_t pos;                ///< byte position in stream, -1 if unknown
 
-    AVRational pixel_aspect;    ///< pixel aspect ratio
-
     int perms;                  ///< permissions, see the AV_PERM_* flags
 
-    int interlaced;             ///< is frame interlaced
-    int top_field_first;
+    enum AVMediaType type;      ///< media type of buffer data
+    AVFilterBufferRefVideoProps *video; ///< video buffer specific properties
+    AVFilterBufferRefAudioProps *audio; ///< audio buffer specific properties
 } AVFilterBufferRef;
 
 /**
- * Copy properties of src to dst, without copying the actual video
- * data.
+ * Copy properties of src to dst, without copying the actual data
  */
 static inline void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
 {
+    // copy common properties
     dst->pts             = src->pts;
     dst->pos             = src->pos;
-    dst->pixel_aspect    = src->pixel_aspect;
-    dst->interlaced      = src->interlaced;
-    dst->top_field_first = src->top_field_first;
-    dst->w               = src->w;
-    dst->h               = src->h;
+
+    switch (src->type) {
+    case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
+    case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
+    }
 }
 
 /**
  * Add a new reference to a buffer.
+ *
  * @param ref   an existing reference to the buffer
  * @param pmask a bitmask containing the allowable permissions in the new
  *              reference
  * @return      a new reference to the buffer with the same properties as the
  *              old, excluding any permissions denied by pmask
  */
 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask);
 
 /**
  * Remove a reference to a buffer. If this is the last reference to the
  * buffer, the buffer itself is also automatically freed.
+ *
  * @param ref reference to the buffer
  */
 void avfilter_unref_buffer(AVFilterBufferRef *ref);
 
 /**
  * A list of supported formats for one end of a filter link. This is used
  * during the format negotiation process to try to pick the best format to
  * use to minimize the number of necessary conversions. Each filter gives a
  * list of the formats supported by each input and output pad. The list
  * given for each pad need not be distinct - they may be references to the
@@ skipping 24 matching lines @@
  * Next, the lists for the second link are merged, yielding:
  * filter (a) --> (a) filter (a) --> (a) filter
  *
  * where (a) = {B}.
  *
  * Unfortunately, when the format lists at the two ends of a link are merged,
  * we must ensure that all links which reference either pre-merge format list
  * get updated as well. Therefore, we have the format list structure store a
  * pointer to each of the pointers to itself.
  */
-typedef struct AVFilterFormats AVFilterFormats;
-struct AVFilterFormats
-{
+typedef struct AVFilterFormats {
     unsigned format_count;      ///< number of formats
     int *formats;               ///< list of media formats
 
     unsigned refcount;          ///< number of references to this list
-    AVFilterFormats ***refs;    ///< references to this list
-};
+    struct AVFilterFormats ***refs; ///< references to this list
+}  AVFilterFormats;;
 
 /**
  * Create a list of supported formats. This is intended for use in
  * AVFilter->query_formats().
+ *
  * @param fmts list of media formats, terminated by -1
  * @return the format list, with no existing references
  */
 AVFilterFormats *avfilter_make_format_list(const int *fmts);
 
 /**
  * Add fmt to the list of media formats contained in *avff.
  * If *avff is NULL the function allocates the filter formats struct
  * and puts its pointer in *avff.
  *
@@ skipping 60 matching lines @@
  *  | |____| |                       | |____| |                |   |   |
  *  |________|                       |________|                |*oldref|
  *                                                             |_______|
  */
 void avfilter_formats_changeref(AVFilterFormats **oldref,
                                 AVFilterFormats **newref);
 
 /**
  * A filter pad used for either input or output.
  */
-struct AVFilterPad
-{
+struct AVFilterPad {
     /**
      * Pad name. The name is unique among inputs and among outputs, but an
      * input may have the same name as an output. This may be NULL if this
      * pad has no need to ever be referenced by name.
      */
     const char *name;
 
     /**
      * AVFilterPad type. Only video supported now, hopefully someone will
      * add audio in the future.
@@ skipping 23 matching lines @@
     /**
      * Callback called before passing the first slice of a new frame. If
      * NULL, the filter layer will default to storing a reference to the
      * picture inside the link structure.
      *
      * Input video pads only.
      */
     void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
 
     /**
-     * Callback function to get a buffer. If NULL, the filter system will
+     * Callback function to get a video buffer. If NULL, the filter system will
      * use avfilter_default_get_video_buffer().
      *
      * Input video pads only.
      */
     AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
 
     /**
+     * Callback function to get an audio buffer. If NULL, the filter system will
+     * use avfilter_default_get_audio_buffer().
+     *
+     * Input audio pads only.
+     */
+    AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
+                                           enum SampleFormat sample_fmt, int size,
+                                           int64_t channel_layout, int planar);
+
+    /**
      * Callback called after the slices of a frame are completely sent. If
      * NULL, the filter layer will default to releasing the reference stored
      * in the link structure during start_frame().
      *
      * Input video pads only.
      */
     void (*end_frame)(AVFilterLink *link);
 
     /**
      * Slice drawing callback. This is where a filter receives video data
      * and should do its processing.
      *
      * Input video pads only.
      */
     void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
 
     /**
+     * Samples filtering callback. This is where a filter receives audio data
+     * and should do its processing.
+     *
+     * Input audio pads only.
+     */
+    void (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+    /**
      * Frame poll callback. This returns the number of immediately available
      * frames. It should return a positive value if the next request_frame()
      * is guaranteed to return one frame (with no delay).
      *
      * Defaults to just calling the source poll_frame() method.
      *
      * Output video pads only.
      */
     int (*poll_frame)(AVFilterLink *link);
 
@@ skipping 18 matching lines @@
      * the filter's internal state as necessary.
      *
      * For both input and output filters, this should return zero on success,
      * and another value on error.
      */
     int (*config_props)(AVFilterLink *link);
 };
 
 /** default handler for start_frame() for video inputs */
 void avfilter_default_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+
 /** default handler for draw_slice() for video inputs */
 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+
 /** default handler for end_frame() for video inputs */
 void avfilter_default_end_frame(AVFilterLink *link);
-/** default handler for config_props() for video outputs */
+
+/** default handler for filter_samples() for audio inputs */
+void avfilter_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+/** default handler for config_props() for audio/video outputs */
 int avfilter_default_config_output_link(AVFilterLink *link);
-/** default handler for config_props() for video inputs */
+
+/** default handler for config_props() for audio/video inputs */
 int avfilter_default_config_input_link (AVFilterLink *link);
+
 /** default handler for get_video_buffer() for video inputs */
 AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link,
-                                                  int perms, int w, int h);
+                                                     int perms, int w, int h);
+
+/** default handler for get_audio_buffer() for audio inputs */
+AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
+                                                     enum SampleFormat sample_fmt, int size,
+                                                     int64_t channel_layout, int planar);
+
 /**
  * A helper for query_formats() which sets all links to the same list of
  * formats. If there are no links hooked to this filter, the list of formats is
  * freed.
  */
 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
+
 /** Default handler for query_formats() */
 int avfilter_default_query_formats(AVFilterContext *ctx);
 
 /** start_frame() handler for filters which simply pass video along */
 void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 
 /** draw_slice() handler for filters which simply pass video along */
 void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 
 /** end_frame() handler for filters which simply pass video along */
 void avfilter_null_end_frame(AVFilterLink *link);
 
+/** filter_samples() handler for filters which simply pass audio along */
+void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
 /** get_video_buffer() handler for filters which simply pass video along */
 AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link,
                                                   int perms, int w, int h);
 
+/** get_audio_buffer() handler for filters which simply pass audio along */
+AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
+                                                  enum SampleFormat sample_fmt, int size,
+                                                  int64_t channel_layout, int planar);
+
 /**
  * Filter definition. This defines the pads a filter contains, and all the
  * callback functions used to interact with the filter.
  */
-typedef struct AVFilter
-{
+typedef struct AVFilter {
     const char *name;         ///< filter name
 
     int priv_size;      ///< size of private data to allocate for the filter
 
     /**
      * Filter initialization function. Args contains the user-supplied
      * parameters. FIXME: maybe an AVOption-based system would be better?
      * opaque is data provided by the code requesting creation of the filter,
      * and is used to pass data to the filter.
      */
@@ skipping 20 matching lines @@
     const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
 
     /**
      * A description for the filter. You should use the
      * NULL_IF_CONFIG_SMALL() macro to define it.
      */
     const char *description;
 } AVFilter;
 
 /** An instance of a filter */
-struct AVFilterContext
-{
+struct AVFilterContext {
     const AVClass *av_class;              ///< needed for av_log()
 
     AVFilter *filter;               ///< the AVFilter of which this is an instance
 
     char *name;                     ///< name of this filter instance
 
     unsigned input_count;           ///< number of input pads
     AVFilterPad   *input_pads;      ///< array of input pads
     AVFilterLink **inputs;          ///< array of pointers to input links
 
     unsigned output_count;          ///< number of output pads
     AVFilterPad   *output_pads;     ///< array of output pads
     AVFilterLink **outputs;         ///< array of pointers to output links
 
     void *priv;                     ///< private data for use by the filter
 };
 
 /**
  * A link between two filters. This contains pointers to the source and
  * destination filters between which this link exists, and the indexes of
  * the pads involved. In addition, this link also contains the parameters
  * which have been negotiated and agreed upon between the filter, such as
  * image dimensions, format, etc.
  */
-struct AVFilterLink
-{
+struct AVFilterLink {
     AVFilterContext *src;       ///< source filter
     unsigned int srcpad;        ///< index of the output pad on the source filter
 
     AVFilterContext *dst;       ///< dest filter
     unsigned int dstpad;        ///< index of the input pad on the dest filter
 
     /** stage of the initialization of the link properties (dimensions, etc) */
     enum {
         AVLINK_UNINIT = 0,      ///< not started
         AVLINK_STARTINIT,       ///< started, but incomplete
         AVLINK_INIT             ///< complete
     } init_state;
 
     enum AVMediaType type;      ///< filter media type
 
+    /* These two parameters apply only to video */
     int w;                      ///< agreed upon image width
     int h;                      ///< agreed upon image height
+    /* These two parameters apply only to audio */
+    int64_t channel_layout;     ///< channel layout of current buffer (see avcodec.h)
+    int64_t sample_rate;        ///< samples per second
+
     int format;                 ///< agreed upon media format
 
     /**
      * Lists of formats supported by the input and output filters respectively.
      * These lists are used for negotiating the format to actually be used,
      * which will be loaded into the format member, above, when chosen.
      */
     AVFilterFormats *in_formats;
     AVFilterFormats *out_formats;
 
     /**
      * The buffer reference currently being sent across the link by the source
      * filter. This is used internally by the filter system to allow
      * automatic copying of buffers which do not have sufficient permissions
      * for the destination. This should not be accessed directly by the
      * filters.
      */
     AVFilterBufferRef *src_buf;
 
     AVFilterBufferRef *cur_buf;
     AVFilterBufferRef *out_buf;
 };
 
 /**
  * Link two filters together.
+ *
  * @param src    the source filter
  * @param srcpad index of the output pad on the source filter
  * @param dst    the destination filter
  * @param dstpad index of the input pad on the destination filter
  * @return       zero on success
  */
 int avfilter_link(AVFilterContext *src, unsigned srcpad,
                   AVFilterContext *dst, unsigned dstpad);
 
 /**
  * Negotiate the media format, dimensions, etc of all inputs to a filter.
+ *
  * @param filter the filter to negotiate the properties for its inputs
  * @return       zero on successful negotiation
  */
 int avfilter_config_links(AVFilterContext *filter);
 
 /**
  * Request a picture buffer with a specific set of permissions.
+ *
  * @param link  the output link to the filter from which the buffer will
  *              be requested
  * @param perms the required access permissions
  * @param w     the minimum width of the buffer to allocate
  * @param h     the minimum height of the buffer to allocate
  * @return      A reference to the buffer. This must be unreferenced with
  *              avfilter_unref_buffer when you are finished with it.
  */
 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms,
                                           int w, int h);
 
 /**
+ * Request an audio samples buffer with a specific set of permissions.
+ *
+ * @param link           the output link to the filter from which the buffer will
+ *                       be requested
+ * @param perms          the required access permissions
+ * @param sample_fmt     the format of each sample in the buffer to allocate
+ * @param size           the buffer size in bytes
+ * @param channel_layout the number and type of channels per sample in the buffer to allocate
+ * @param planar         audio data layout - planar or packed
+ * @return               A reference to the samples. This must be unreferenced with
+ *                       avfilter_unref_samples when you are finished with it.
+ */
+AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
+                                             enum SampleFormat sample_fmt, int size,
+                                             int64_t channel_layout, int planar);
+
+/**
  * Request an input frame from the filter at the other end of the link.
+ *
  * @param link the input link
  * @return     zero on success
  */
 int avfilter_request_frame(AVFilterLink *link);
 
 /**
  * Poll a frame from the filter chain.
+ *
  * @param  link the input link
  * @return the number of immediately available frames, a negative
  * number in case of error
  */
 int avfilter_poll_frame(AVFilterLink *link);
 
 /**
  * Notifie the next filter of the start of a frame.
+ *
  * @param link   the output link the frame will be sent over
  * @param picref A reference to the frame about to be sent. The data for this
  *               frame need only be valid once draw_slice() is called for that
  *               portion. The receiving filter will free this reference when
  *               it no longer needs it.
  */
 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 
 /**
  * Notifie the next filter that the current frame has finished.
+ *
  * @param link the output link the frame was sent over
  */
 void avfilter_end_frame(AVFilterLink *link);
 
 /**
  * Send a slice to the next filter.
  *
  * Slices have to be provided in sequential order, either in
  * top-bottom or bottom-top order. If slices are provided in
  * non-sequential order the behavior of the function is undefined.
  *
  * @param link the output link over which the frame is being sent
  * @param y    offset in pixels from the top of the image for this slice
  * @param h    height of this slice in pixels
  * @param slice_dir the assumed direction for sending slices,
  *             from the top slice to the bottom slice if the value is 1,
  *             from the bottom slice to the top slice if the value is -1,
  *             for other values the behavior of the function is undefined.
  */
 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 
+/**
+ * Send a buffer of audio samples to the next filter.
+ *
+ * @param link       the output link over which the audio samples are being sent
+ * @param samplesref a reference to the buffer of audio samples being sent. The
+ *                   receiving filter will free this reference when it no longer
+ *                   needs it or pass it on to the next filter.
+ */
+void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
 /** Initialize the filter system. Register all builtin filters. */
 void avfilter_register_all(void);
 
 /** Uninitialize the filter system. Unregister all filters. */
 void avfilter_uninit(void);
 
 /**
  * Register a filter. This is only needed if you plan to use
  * avfilter_get_by_name later to lookup the AVFilter structure by name. A
  * filter can still by instantiated with avfilter_open even if it is not
  * registered.
+ *
  * @param filter the filter to register
  * @return 0 if the registration was succesfull, a negative value
  * otherwise
  */
 int avfilter_register(AVFilter *filter);
 
 /**
  * Get a filter definition matching the given name.
+ *
  * @param name the filter name to find
  * @return     the filter definition, if any matching one is registered.
  *             NULL if none found.
  */
 AVFilter *avfilter_get_by_name(const char *name);
 
 /**
  * If filter is NULL, returns a pointer to the first registered filter pointer,
  * if filter is non-NULL, returns the next pointer after filter.
  * If the returned pointer points to NULL, the last registered filter
  * was already reached.
  */
 AVFilter **av_filter_next(AVFilter **filter);
 
 /**
  * Create a filter instance.
+ *
+ * @param filter_ctx put here a pointer to the created filter context
+ * on success, NULL on failure
  * @param filter    the filter to create an instance of
  * @param inst_name Name to give to the new instance. Can be NULL for none.
- * @return          Pointer to the new instance on success. NULL on failure.
+ * @return >= 0 in case of success, a negative error code otherwise
  */
-AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
+int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
 
 /**
  * Initialize a filter.
+ *
  * @param filter the filter to initialize
  * @param args   A string of parameters to use when initializing the filter.
  *               The format and meaning of this string varies by filter.
  * @param opaque Any extra non-string data needed by the filter. The meaning
  *               of this parameter varies by filter.
  * @return       zero on success
  */
 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
 
 /**
  * Destroy a filter.
+ *
  * @param filter the filter to destroy
  */
 void avfilter_destroy(AVFilterContext *filter);
 
 /**
  * Insert a filter in the middle of an existing link.
+ *
  * @param link the link into which the filter should be inserted
  * @param filt the filter to be inserted
  * @param in   the input pad on the filter to connect
  * @param out  the output pad on the filter to connect
  * @return     zero on success
  */
 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
                            unsigned in, unsigned out);
 
 /**
  * Insert a new pad.
+ *
  * @param idx Insertion point. Pad is inserted at the end if this point
  *            is beyond the end of the list of pads.
  * @param count Pointer to the number of pads in the list
  * @param padidx_off Offset within an AVFilterLink structure to the element
  *                   to increment when inserting a new pad causes link
  *                   numbering to change
  * @param pads Pointer to the pointer to the beginning of the list of pads
  * @param links Pointer to the pointer to the beginning of the list of links
  * @param newpad The new pad to add. A copy is made when adding.
  */
@@ skipping 11 matching lines @@
 
 /** Insert a new output pad for the filter. */
 static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
                                           AVFilterPad *p)
 {
     avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
                         &f->output_pads, &f->outputs, p);
 }
 
 #endif  /* AVFILTER_AVFILTER_H */