53 if (!aresample->
swr) {
83 int64_t out_rate, out_layout;
110 int ratelist[] = { out_rate, -1 };
120 int formatlist[] = { out_format, -1 };
128 int64_t layout_list[] = { out_layout, -1 };
143 int64_t out_rate, out_layout;
145 char inchl_buf[128], outchl_buf[128];
187 int n_out = n_in * aresample->
ratio + 32;
244 *outsamplesref_ret = outsamplesref;
275 if (
flush_frame(outlink, 0, &outsamplesref) >= 0) {
288 if ((ret =
flush_frame(outlink, 1, &outsamplesref)) < 0)
296 #if FF_API_CHILD_CLASS_NEXT 297 static const AVClass *resample_child_class_next(
const AVClass *prev)
306 *iter = (
void*)(uintptr_t)
c;
316 #define OFFSET(x) offsetof(AResampleContext, x) 317 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 329 #if FF_API_CHILD_CLASS_NEXT 330 .child_class_next = resample_child_class_next,
362 .priv_class = &aresample_class,
363 .
inputs = aresample_inputs,
This structure describes decoded (raw) audio or video data.
static const AVFilterPad aresample_inputs[]
#define LIBAVUTIL_VERSION_INT
Main libavfilter public API header.
const char * av_default_item_name(void *ptr)
Return the context name.
int64_t swr_next_pts(struct SwrContext *s, int64_t pts)
Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate...
static const AVOption options[]
AVFilterFormatsConfig outcfg
Lists of supported formats / etc.
const char * name
Pad name.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
AVFilterLink ** inputs
array of pointers to input links
#define av_assert0(cond)
assert() equivalent, that is always enabled.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
av_cold struct SwrContext * swr_alloc(void)
Allocate SwrContext.
static av_cold int end(AVCodecContext *avctx)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
#define AVERROR_EOF
End of file.
#define AV_LOG_VERBOSE
Detailed information.
#define ROUNDED_DIV(a, b)
A filter pad used for either input or output.
void *(* child_next)(void *obj, void *prev)
Return next AVOptions-enabled child or NULL.
A link between two filters.
libswresample public header
static void * resample_child_next(void *obj, void *prev)
int sample_rate
samples per second
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
The libswresample context.
#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
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link...
simple assert() macros that are a bit more flexible than ISO C assert().
static const AVClass * resample_child_class_iterate(void **iter)
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.
int64_t swr_get_delay(struct SwrContext *s, int64_t base)
Gets the delay the next input sample will experience relative to the next output sample.
uint64_t channel_layout
Channel layout of the audio data.
int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt)
int channels
number of audio channels, only used for audio.
audio channel layout utility functions
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
static int flush_frame(AVFilterLink *outlink, int final, AVFrame **outsamplesref_ret)
static const AVClass aresample_class
static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
struct SwrContext * swr_alloc_set_opts(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)
Allocate SwrContext if needed and set/reset common parameters.
AVFilterContext * src
source filter
const AVClass * swr_get_class(void)
Get the AVClass for SwrContext.
static const AVFilterPad outputs[]
int format
agreed upon media format
A list of supported channel layouts.
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
static av_cold void uninit(AVFilterContext *ctx)
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
AVSampleFormat
Audio sample formats.
static const AVFilterPad aresample_outputs[]
av_cold void swr_free(SwrContext **ss)
Free the given SwrContext and set the pointer to NULL.
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
Describe the class of an AVClass context structure.
int sample_rate
Sample rate of the audio data.
Rational number (pair of numerator and denominator).
const char * name
Filter name.
int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count, const uint8_t *in_arg[SWR_CH_MAX], int in_count)
AVFilterLink ** outputs
array of pointers to output links
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
static int filter_frame(AVFilterLink *inlink, AVFrame *insamplesref)
uint64_t channel_layout
channel layout of current buffer (see libavutil/channel_layout.h)
int channels
Number of channels.
AVFilterFormatsConfig incfg
Lists of supported formats / etc.
AVFilterContext * dst
dest filter
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
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
static int query_formats(AVFilterContext *ctx)
uint8_t ** extended_data
pointers to the data planes/channels.
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
int nb_samples
number of audio samples (per channel) described by this frame
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
#define AV_NOPTS_VALUE
Undefined timestamp value.
static int request_frame(AVFilterLink *outlink)
av_cold int swr_init(struct SwrContext *s)
Initialize context after user parameters have been set.
static int config_output(AVFilterLink *outlink)