29 #define AC3ENC_FLOAT 0 31 #define FFT_FIXED_32 1 38 #define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED 73 uint64_t coord = energy_ch / (energy_cpl >> 24);
74 uint32_t coord32 =
FFMIN(coord, 1073741824);
75 coord32 =
ff_sqrt(coord32) << 9;
110 iwin[
i] =
lrintf(fwin[
i] * (1 << 22));
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
void(* mdct_end)(struct AC3EncodeContext *s)
av_cold void ff_kbd_window_init(float *window, float alpha, int n)
Generate a Kaiser-Bessel Derived Window.
#define LIBAVUTIL_VERSION_INT
static int allocate_sample_buffers(AC3EncodeContext *s)
static av_cold int init(AVCodecContext *avctx)
static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
const char * av_default_item_name(void *ptr)
Return the context name.
int(* mdct_init)(struct AC3EncodeContext *s)
static av_cold int ac3_fixed_mdct_init(AC3EncodeContext *s)
Initialize MDCT tables.
void(* vector_clip_int32)(int32_t *dst, const int32_t *src, int32_t min, int32_t max, unsigned int len)
Clip each element in an array of int32_t to a given minimum and maximum value.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
Finalize encoding and free any memory allocated by the encoder.
AC3DSPContext ac3dsp
AC-3 optimized functions.
const uint64_t ff_ac3_channel_layouts[19]
List of supported channel layouts.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int flags
AV_CODEC_FLAG_*.
const char * name
Name of the codec implementation.
int fixed_point
indicates if fixed-point encoder is being used
static av_cold void ac3_fixed_mdct_end(AC3EncodeContext *s)
Finalize MDCT and free allocated memory.
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
FFTContext mdct
FFT context for MDCT calculation.
const SampleType * mdct_window
MDCT window function array.
void(* sum_square_butterfly_int32)(int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
static void clip_coefficients(AudioDSPContext *adsp, int32_t *coef, unsigned int len)
AVSampleFormat
Audio sample formats.
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
main external API structure.
int(* allocate_sample_buffers)(struct AC3EncodeContext *s)
Describe the class of an AVClass context structure.
int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
static const AVCodecDefault ac3_defaults[]
AC-3 encoder private context.
AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
Allocate and initialize a fixed DSP context.
AC-3 encoder float/fixed template.
common internal api header.
AVCodec ff_ac3_fixed_encoder
static const AVClass ac3enc_class
static const AVOption ac3_options[]
AVCodecContext * avctx
parent AVCodecContext
AC-3 encoder & E-AC-3 encoder common header.
static enum AVSampleFormat sample_fmts[]
const int ff_ac3_sample_rate_tab[]
#define av_malloc_array(a, b)
static void sum_square_butterfly(AC3EncodeContext *s, int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
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
av_cold int ff_ac3_encode_init(AVCodecContext *avctx)