FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Data Structures | Macros | Functions | Variables
alacenc.c File Reference
#include "libavutil/opt.h"
#include "avcodec.h"
#include "put_bits.h"
#include "internal.h"
#include "lpc.h"
#include "mathops.h"
#include "alac_data.h"

Go to the source code of this file.

Data Structures

struct  RiceContext
 
struct  AlacLPCContext
 
struct  AlacEncodeContext
 

Macros

#define DEFAULT_FRAME_SIZE   4096
 
#define ALAC_EXTRADATA_SIZE   36
 
#define ALAC_FRAME_HEADER_SIZE   55
 
#define ALAC_FRAME_FOOTER_SIZE   3
 
#define ALAC_ESCAPE_CODE   0x1FF
 
#define ALAC_MAX_LPC_ORDER   30
 
#define DEFAULT_MAX_PRED_ORDER   6
 
#define DEFAULT_MIN_PRED_ORDER   4
 
#define ALAC_MAX_LPC_PRECISION   9
 
#define ALAC_MAX_LPC_SHIFT   9
 
#define ALAC_CHMODE_LEFT_RIGHT   0
 
#define ALAC_CHMODE_LEFT_SIDE   1
 
#define ALAC_CHMODE_RIGHT_SIDE   2
 
#define ALAC_CHMODE_MID_SIDE   3
 
#define COPY_SAMPLES(type)
 
#define OFFSET(x)   offsetof(AlacEncodeContext, x)
 
#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 

Functions

static void init_sample_buffers (AlacEncodeContext *s, int channels, uint8_t const *samples[2])
 
static void encode_scalar (AlacEncodeContext *s, int x, int k, int write_sample_size)
 
static void write_element_header (AlacEncodeContext *s, enum AlacRawDataBlockType element, int instance)
 
static void calc_predictor_params (AlacEncodeContext *s, int ch)
 
static int estimate_stereo_mode (int32_t *left_ch, int32_t *right_ch, int n)
 
static void alac_stereo_decorrelation (AlacEncodeContext *s)
 
static void alac_linear_predictor (AlacEncodeContext *s, int ch)
 
static void alac_entropy_coder (AlacEncodeContext *s, int ch)
 
static void write_element (AlacEncodeContext *s, enum AlacRawDataBlockType element, int instance, const uint8_t *samples0, const uint8_t *samples1)
 
static int write_frame (AlacEncodeContext *s, AVPacket *avpkt, uint8_t *const *samples)
 
static av_always_inline int get_max_frame_size (int frame_size, int ch, int bps)
 
static av_cold int alac_encode_close (AVCodecContext *avctx)
 
static av_cold int alac_encode_init (AVCodecContext *avctx)
 
static int alac_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
 

Variables

static const AVOption options []
 
static const AVClass alacenc_class
 
AVCodec ff_alac_encoder
 

Macro Definition Documentation

#define DEFAULT_FRAME_SIZE   4096

Definition at line 31 of file alacenc.c.

Referenced by alac_encode_frame(), alac_encode_init(), get_max_frame_size(), and write_element_header().

#define ALAC_EXTRADATA_SIZE   36

Definition at line 32 of file alacenc.c.

Referenced by alac_encode_init().

#define ALAC_FRAME_HEADER_SIZE   55

Definition at line 33 of file alacenc.c.

#define ALAC_FRAME_FOOTER_SIZE   3

Definition at line 34 of file alacenc.c.

#define ALAC_ESCAPE_CODE   0x1FF

Definition at line 36 of file alacenc.c.

Referenced by encode_scalar().

#define ALAC_MAX_LPC_ORDER   30

Definition at line 37 of file alacenc.c.

Referenced by alac_encode_init().

#define DEFAULT_MAX_PRED_ORDER   6

Definition at line 38 of file alacenc.c.

#define DEFAULT_MIN_PRED_ORDER   4

Definition at line 39 of file alacenc.c.

#define ALAC_MAX_LPC_PRECISION   9

Definition at line 40 of file alacenc.c.

Referenced by calc_predictor_params().

#define ALAC_MAX_LPC_SHIFT   9

Definition at line 41 of file alacenc.c.

Referenced by calc_predictor_params().

#define ALAC_CHMODE_LEFT_RIGHT   0

Definition at line 43 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_LEFT_SIDE   1

Definition at line 44 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_RIGHT_SIDE   2

Definition at line 45 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_MID_SIDE   3

Definition at line 46 of file alacenc.c.

#define COPY_SAMPLES (   type)
Value:
do { \
for (ch = 0; ch < channels; ch++) { \
int32_t *bptr = s->sample_buf[ch]; \
const type *sptr = (const type *)samples[ch]; \
for (i = 0; i < s->frame_size; i++) \
bptr[i] = sptr[i] >> shift; \
} \
} while (0)
s
const char * s
Definition: avisynth_c.h:631
shift
static int shift(int a, int b)
Definition: sonic.c:82
int32_t
int32_t
Definition: audio_convert.c:194
type
GLint GLenum type
Definition: opengl_enc.c:105
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469

Referenced by init_sample_buffers().

#define OFFSET (   x)    offsetof(AlacEncodeContext, x)

Definition at line 652 of file alacenc.c.

#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 653 of file alacenc.c.

Function Documentation

static void init_sample_buffers ( AlacEncodeContext *  s,
int  channels,
uint8_t const *  samples[2] 
)
static

Definition at line 83 of file alacenc.c.

Referenced by write_element().

static void encode_scalar ( AlacEncodeContext *  s,
int  x,
int  k,
int  write_sample_size 
)
static

Definition at line 105 of file alacenc.c.

Referenced by alac_entropy_coder().

static void write_element_header ( AlacEncodeContext *  s,
enum AlacRawDataBlockType  element,
int  instance 
)
static

Definition at line 133 of file alacenc.c.

Referenced by write_element().

static void calc_predictor_params ( AlacEncodeContext *  s,
int  ch 
)
static

Definition at line 152 of file alacenc.c.

Referenced by write_element().

static int estimate_stereo_mode ( int32_t *  left_ch,
int32_t *  right_ch,
int  n 
)
static

Definition at line 182 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

static void alac_stereo_decorrelation ( AlacEncodeContext *  s)
static

Definition at line 215 of file alacenc.c.

Referenced by write_element().

static void alac_linear_predictor ( AlacEncodeContext *  s,
int  ch 
)
static

Definition at line 255 of file alacenc.c.

Referenced by write_element().

static void alac_entropy_coder ( AlacEncodeContext *  s,
int  ch 
)
static

Definition at line 319 of file alacenc.c.

Referenced by write_element().

static void write_element ( AlacEncodeContext *  s,
enum AlacRawDataBlockType  element,
int  instance,
const uint8_t *  samples0,
const uint8_t *  samples1 
)
static

Definition at line 363 of file alacenc.c.

Referenced by write_frame().

static int write_frame ( AlacEncodeContext *  s,
AVPacket *  avpkt,
uint8_t *const *  samples 
)
static

Definition at line 458 of file alacenc.c.

Referenced by alac_encode_frame().

static av_always_inline int get_max_frame_size ( int  frame_size,
int  ch,
int  bps 
)
static

Definition at line 489 of file alacenc.c.

Referenced by alac_encode_frame(), and alac_encode_init().

static av_cold int alac_encode_close ( AVCodecContext *  avctx)
static

Definition at line 495 of file alacenc.c.

Referenced by alac_encode_init().

static av_cold int alac_encode_init ( AVCodecContext *  avctx)
static

Definition at line 504 of file alacenc.c.

static int alac_encode_frame ( AVCodecContext *  avctx,
AVPacket *  avpkt,
const AVFrame *  frame,
int *  got_packet_ptr 
)
static

Definition at line 612 of file alacenc.c.

Variable Documentation

const AVOption options[]
static
Initial value:
= {
{ "min_prediction_order", NULL, OFFSET(min_prediction_order), AV_OPT_TYPE_INT, { .i64 = DEFAULT_MIN_PRED_ORDER }, MIN_LPC_ORDER, ALAC_MAX_LPC_ORDER, AE },
{ "max_prediction_order", NULL, OFFSET(max_prediction_order), AV_OPT_TYPE_INT, { .i64 = DEFAULT_MAX_PRED_ORDER }, MIN_LPC_ORDER, ALAC_MAX_LPC_ORDER, AE },
{ NULL },
}
DEFAULT_MIN_PRED_ORDER
#define DEFAULT_MIN_PRED_ORDER
Definition: alacenc.c:39
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_INT
Definition: opt.h:223
DEFAULT_MAX_PRED_ORDER
#define DEFAULT_MAX_PRED_ORDER
Definition: alacenc.c:38
AE
#define AE
Definition: alacenc.c:653
ALAC_MAX_LPC_ORDER
#define ALAC_MAX_LPC_ORDER
Definition: alacenc.c:37
MIN_LPC_ORDER
#define MIN_LPC_ORDER
Definition: lpc.h:37
OFFSET
#define OFFSET(x)
Definition: alacenc.c:652

Definition at line 654 of file alacenc.c.

const AVClass alacenc_class
static
Initial value:
= {
.class_name = "alacenc",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:68
options
static const AVOption options[]
Definition: alacenc.c:654

Definition at line 661 of file alacenc.c.

AVCodec ff_alac_encoder
Initial value:
= {
.name = "alac",
.long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ALAC,
.priv_data_size = sizeof(AlacEncodeContext),
.priv_class = &alacenc_class,
.init = alac_encode_init,
.encode2 = alac_encode_frame,
.close = alac_encode_close,
.capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME,
.channel_layouts = ff_alac_channel_layouts,
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
}
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:60
alac_encode_init
static av_cold int alac_encode_init(AVCodecContext *avctx)
Definition: alacenc.c:504
AV_CODEC_ID_ALAC
Definition: avcodec.h:435
alacenc_class
static const AVClass alacenc_class
Definition: alacenc.c:661
alac_encode_frame
static int alac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: alacenc.c:612
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:194
AV_CODEC_CAP_SMALL_LAST_FRAME
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: avcodec.h:886
AV_SAMPLE_FMT_S32P
signed 32 bits, planar
Definition: samplefmt.h:69
ff_alac_channel_layouts
const uint64_t ff_alac_channel_layouts[ALAC_MAX_CHANNELS+1]
Definition: alac_data.c:35
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:59
alac_encode_close
static av_cold int alac_encode_close(AVCodecContext *avctx)
Definition: alacenc.c:495
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:68

Definition at line 668 of file alacenc.c.

Generated on Mon Feb 15 2016 15:20:49 for FFmpeg by   doxygen 1.8.6