40 #define MAX_CHANNELS 64 61 sscanf(*arg,
" %n", &len);
68 int len,
i, channel_id = 0;
73 if (sscanf(*arg,
"%7[A-Z]%n", buf, &len)) {
76 for (i = 32; i > 0; i >>= 1) {
77 if (layout >= (int64_t)1 << i) {
83 if (channel_id >=
MAX_CHANNELS || layout0 != (int64_t)1 << channel_id)
85 *rchannel = channel_id;
91 if (sscanf(*arg,
"c%d%n", &channel_id, &len) &&
93 *rchannel = channel_id;
105 int out_ch_id, in_ch_id,
len, named,
ret, sign = 1;
106 int nb_in_channels[2] = { 0, 0 };
112 "pan filter needs a channel layout and a set " 113 "of channel definitions as parameter\n");
135 "Expected out channel name, got \"%.8s\"\n", arg);
142 "Channel \"%.8s\" does not exist in the chosen layout\n", arg0);
154 "Invalid out channel name \"%.8s\"\n", arg0);
158 if (used_out_ch[out_ch_id]) {
160 "Can not reference out channel %d twice\n", out_ch_id);
164 used_out_ch[out_ch_id] = 1;
168 }
else if (*arg ==
'<') {
173 "Syntax error after channel name in \"%.8s\"\n", arg0);
181 if (sscanf(arg,
"%lf%n *%n", &gain, &len, &len))
185 "Expected in channel name, got \"%.8s\"\n", arg);
189 nb_in_channels[named]++;
190 if (nb_in_channels[!named]) {
192 "Can not mix named and numbered channels\n");
196 if (used_in_ch[in_ch_id]) {
198 "Can not reference in channel %d twice\n", in_ch_id);
202 used_in_ch[in_ch_id] = 1;
203 pan->
gain[out_ch_id][in_ch_id] = sign *
gain;
209 }
else if (*arg !=
'+') {
239 if (gain != 0. && gain != 1.)
242 if (gain && nb_gain++)
285 char buf[1024], *cur;
305 "af_pan supports a maximum of %d channels. " 306 "Feel free to ask for a higher limit.\n",
MAX_CHANNELS);
332 for (j = 0; j < link->
channels; j++) {
333 if (pan->
gain[i][j]) {
350 for (j = 0; j < link->
channels; j++)
352 if (t > -1
E-5 && t < 1
E-5) {
356 "Degenerate coefficients while renormalizing\n");
359 for (j = 0; j < link->
channels; j++)
360 pan->
gain[i][j] /= t;
374 for (j = 0; j < link->
channels; j++) {
375 r =
snprintf(cur, buf +
sizeof(buf) - cur,
"%s%.3g i%d",
376 j ?
" + " :
"", pan->
gain[i][j], j);
377 cur +=
FFMIN(buf +
sizeof(buf) - cur, r);
424 #define OFFSET(x) offsetof(PanContext, x) 455 .priv_class = &pan_class,
double gain[MAX_CHANNELS][MAX_CHANNELS]
This structure describes decoded (raw) audio or video data.
#define AV_LOG_WARNING
Something somehow does not look correct.
Main libavfilter public API header.
#define AV_OPT_FLAG_AUDIO_PARAM
AVFilterFormatsConfig outcfg
Lists of supported formats / etc.
static int config_props(AVFilterLink *link)
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
const char * name
Pad name.
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
AVFilterLink ** inputs
array of pointers to input links
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
#define AV_LOG_VERBOSE
Detailed information.
static const AVFilterPad pan_inputs[]
static const AVOption pan_options[]
A filter pad used for either input or output.
A link between two filters.
libswresample public header
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
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.
#define AV_OPT_FLAG_FILTERING_PARAM
a generic parameter which can be set by the user for filtering
static __device__ float fabs(float a)
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
static int query_formats(AVFilterContext *ctx)
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
static int are_gains_pure(const PanContext *pan)
uint64_t channel_layout
Channel layout of the audio data.
int channels
number of audio channels, only used for audio.
audio channel layout utility functions
int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride)
Set a customized remix matrix.
static void skip_spaces(char **arg)
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.
static const AVFilterPad outputs[]
int format
agreed upon media format
A list of supported channel layouts.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
int64_t out_channel_layout
#define AV_LOG_INFO
Standard information.
char * av_strdup(const char *s)
Duplicate a string.
av_cold void swr_free(SwrContext **ss)
Free the given SwrContext and set the pointer to NULL.
int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map)
Set a customized input channel mapping.
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 channel_map[MAX_CHANNELS]
const char * name
Filter name.
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 link
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
enum MovChannelLayoutTag * layouts
AVFILTER_DEFINE_CLASS(pan)
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
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
uint64_t channel_layout
channel layout of current buffer (see libavutil/channel_layout.h)
static int parse_channel_name(char **arg, int *rchannel, int *rnamed)
int channels
Number of channels.
AVFilterFormatsConfig incfg
Lists of supported formats / etc.
AVFilterContext * dst
dest filter
static av_cold int init(AVFilterContext *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
uint8_t ** extended_data
pointers to the data planes/channels.
int nb_samples
number of audio samples (per channel) described by this frame
static av_cold void uninit(AVFilterContext *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 layout
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
av_cold int swr_init(struct SwrContext *s)
Initialize context after user parameters have been set.
static const AVFilterPad pan_outputs[]