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29 #define AC3ENC_FLOAT 1
44 s->ac3dsp.float_to_fixed24(
s->fixed_coef_buffer + (chan_size * !cpl),
45 s->mdct_coef_buffer + (chan_size * !cpl),
46 chan_size * (
s->channels + cpl));
67 coord *= sqrtf(energy_ch / energy_cpl);
72 const float *coef0,
const float *coef1,
75 s->ac3dsp.sum_square_butterfly_float(sum, coef0, coef1,
len);
@ AV_SAMPLE_FMT_FLTP
float, planar
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
void(* vector_clipf)(float *dst, const float *src, int len, float min, float max)
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
const AVCodecDefault ff_ac3_enc_defaults[]
static enum AVSampleFormat sample_fmts[]
static void sum_square_butterfly(AC3EncodeContext *s, float sum[4], const float *coef0, const float *coef1, int len)
static int allocate_sample_buffers(AC3EncodeContext *s)
int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
static SDL_Window * window
int flags
AV_CODEC_FLAG_*.
static av_cold void ac3_float_mdct_end(AC3EncodeContext *s)
Finalize MDCT and free allocated memory.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
const uint64_t ff_ac3_channel_layouts[19]
List of supported channel layouts.
const AVCodec ff_ac3_encoder
AC-3 encoder private context.
av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
static void scale_coefficients(AC3EncodeContext *s)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
const int ff_ac3_sample_rate_tab[]
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
#define av_malloc_array(a, b)
static av_cold int ac3_float_mdct_init(AC3EncodeContext *s)
Initialize MDCT tables.
AVSampleFormat
Audio sample formats.
const char * name
Name of the codec implementation.
static void clip_coefficients(AudioDSPContext *adsp, float *coef, unsigned int len)
main external API structure.
av_cold void ff_kbd_window_init(float *window, float alpha, int n)
Generate a Kaiser-Bessel Derived Window.
const AVClass ff_ac3enc_class
av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
AVCodecContext * avctx
parent AVCodecContext
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
Finalize encoding and free any memory allocated by the encoder.
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)