adpcmenc.c File Reference

#include "config_components.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "put_bits.h"
#include "bytestream.h"
#include "adpcm.h"
#include "adpcm_data.h"
#include "codec_internal.h"
#include "encode.h"

Go to the source code of this file.

Data Structures
struct	TrellisPath
struct	TrellisNode
struct	ADPCMEncodeContext

Macros
#define	CASE_0(codec_id, ...)
#define	CASE_1(codec_id, ...)
#define	CASE_2(enabled, codec_id, ...)   CASE_ ## enabled(codec_id, __VA_ARGS__)
#define	CASE_3(config, codec_id, ...)   CASE_2(config, codec_id, __VA_ARGS__)
#define	CASE(codec, ...)   CASE_3(CONFIG_ ## codec ## _ENCODER, AV_CODEC_ID_ ## codec, __VA_ARGS__)
#define	FREEZE_INTERVAL   128
#define	STORE_NODE(NAME, STEP_INDEX)
#define	LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)
#define	ADPCM_ENCODER_0(id_, name_, sample_fmts_, capabilities_, long_name_)
#define	ADPCM_ENCODER_1(id_, name_, sample_fmts_, capabilities_, long_name_)
#define	ADPCM_ENCODER_2(enabled, codec_id, name, sample_fmts, capabilities, long_name)   ADPCM_ENCODER_ ## enabled(codec_id, name, sample_fmts, capabilities, long_name)
#define	ADPCM_ENCODER_3(config, codec_id, name, sample_fmts, capabilities, long_name)   ADPCM_ENCODER_2(config, codec_id, name, sample_fmts, capabilities, long_name)
#define	ADPCM_ENCODER(codec, name, sample_fmts, capabilities, long_name)

Functions
static av_cold int	adpcm_encode_init (AVCodecContext *avctx)
static av_cold int	adpcm_encode_close (AVCodecContext *avctx)
static uint8_t	adpcm_ima_compress_sample (ADPCMChannelStatus *c, int16_t sample)
static uint8_t	adpcm_ima_alp_compress_sample (ADPCMChannelStatus *c, int16_t sample)
static uint8_t	adpcm_ima_qt_compress_sample (ADPCMChannelStatus *c, int16_t sample)
static uint8_t	adpcm_ms_compress_sample (ADPCMChannelStatus *c, int16_t sample)
static uint8_t	adpcm_yamaha_compress_sample (ADPCMChannelStatus *c, int16_t sample)
static void	adpcm_compress_trellis (AVCodecContext *avctx, const int16_t *samples, uint8_t *dst, ADPCMChannelStatus *c, int n, int stride)
static int	adpcm_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

Variables
static enum AVSampleFormat	sample_fmts []
static enum AVSampleFormat	sample_fmts_p []
static const AVChannelLayout	ch_layouts []
static const AVOption	options []
static const AVClass	adpcm_encoder_class

Detailed Description

ADPCM encoders See ADPCM decoder reference documents for codec information.

Definition in file adpcmenc.c.

Macro Definition Documentation

CASE_0

#define CASE_0	(		codec_id,
			...
	)

Definition at line 44 of file adpcmenc.c.

CASE_1

#define CASE_1	(		codec_id,
			...
	)

Value:

    case codec_id:            \
    { __VA_ARGS__ }           \
    break;

Definition at line 45 of file adpcmenc.c.

CASE_2

#define CASE_2	(		enabled,
			codec_id,
			...
	)		CASE_ ## enabled(codec_id, __VA_ARGS__)

Definition at line 49 of file adpcmenc.c.

CASE_3

#define CASE_3	(		config,
			codec_id,
			...
	)		CASE_2(config, codec_id, __VA_ARGS__)

Definition at line 51 of file adpcmenc.c.

CASE

#define CASE	(		codec,
			...
	)		CASE_3(CONFIG_ ## codec ## _ENCODER, AV_CODEC_ID_ ## codec, __VA_ARGS__)

Definition at line 53 of file adpcmenc.c.

FREEZE_INTERVAL

#define FREEZE_INTERVAL   128

Definition at line 80 of file adpcmenc.c.

STORE_NODE

#define STORE_NODE	(		NAME,
			STEP_INDEX
	)

LOOP_NODES

#define LOOP_NODES	(		NAME,
			STEP_TABLE,
			STEP_INDEX
	)

Value:

                const int predictor = nodes[j]->sample1;\
                const int div = (sample - predictor) * 4 / STEP_TABLE;\
                int nmin = av_clip(div - range, -7, 6);\
                int nmax = av_clip(div + range, -6, 7);\
                if (nmin <= 0)\
                    nmin--; /* distinguish -0 from +0 */\
                if (nmax < 0)\
                    nmax--;\
                for (nidx = nmin; nidx <= nmax; nidx++) {\
                    const int nibble = nidx < 0 ? 7 - nidx : nidx;\
                    int dec_sample = predictor +\
                                    (STEP_TABLE *\
                                     ff_adpcm_yamaha_difflookup[nibble]) / 8;\
                    STORE_NODE(NAME, STEP_INDEX);\
                }

ADPCM_ENCODER_0

#define ADPCM_ENCODER_0	(		id_,
			name_,
			sample_fmts_,
			capabilities_,
			long_name_
	)

Definition at line 983 of file adpcmenc.c.

ADPCM_ENCODER_1

#define ADPCM_ENCODER_1	(		id_,
			name_,
			sample_fmts_,
			capabilities_,
			long_name_
	)

Value:

const FFCodec ff_ ## name_ ## _encoder = {                                 \
    .p.name         = #name_,                                              \
    CODEC_LONG_NAME(long_name_),                                           \
    .p.type         = AVMEDIA_TYPE_AUDIO,                                  \
    .p.id           = id_,                                                 \
    .p.sample_fmts  = sample_fmts_,                                        \
    .p.ch_layouts   = ch_layouts,                                          \
    .p.capabilities = capabilities_ | AV_CODEC_CAP_DR1 |                   \
                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,               \
    .p.priv_class   = &adpcm_encoder_class,                                \
    .priv_data_size = sizeof(ADPCMEncodeContext),                          \
    .init           = adpcm_encode_init,                                   \
    FF_CODEC_ENCODE_CB(adpcm_encode_frame),                                \
    .close          = adpcm_encode_close,                                  \
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,                           \
};

Definition at line 984 of file adpcmenc.c.

ADPCM_ENCODER_2

#define ADPCM_ENCODER_2	(		enabled,
			codec_id,
			name,
			sample_fmts,
			capabilities,
			long_name
	)		ADPCM_ENCODER_ ## enabled(codec_id, name, sample_fmts, capabilities, long_name)

Definition at line 1001 of file adpcmenc.c.

ADPCM_ENCODER_3

#define ADPCM_ENCODER_3	(		config,
			codec_id,
			name,
			sample_fmts,
			capabilities,
			long_name
	)		ADPCM_ENCODER_2(config, codec_id, name, sample_fmts, capabilities, long_name)

Definition at line 1003 of file adpcmenc.c.

ADPCM_ENCODER

#define ADPCM_ENCODER	(		codec,
			name,
			sample_fmts,
			capabilities,
			long_name
	)

Value:

    ADPCM_ENCODER_3(CONFIG_ ## codec ## _ENCODER, AV_CODEC_ID_ ## codec, \
                    name, sample_fmts, capabilities, long_name)

Definition at line 1005 of file adpcmenc.c.

Function Documentation

adpcm_encode_init()

static av_cold int adpcm_encode_init ( AVCodecContext *  avctx )

static

Definition at line 82 of file adpcmenc.c.

adpcm_encode_close()

static av_cold int adpcm_encode_close ( AVCodecContext *  avctx )

static

Definition at line 219 of file adpcmenc.c.

adpcm_ima_compress_sample()

static uint8_t adpcm_ima_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 231 of file adpcmenc.c.

adpcm_ima_alp_compress_sample()

static uint8_t adpcm_ima_alp_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 244 of file adpcmenc.c.

adpcm_ima_qt_compress_sample()

static uint8_t adpcm_ima_qt_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 263 of file adpcmenc.c.

adpcm_ms_compress_sample()

static uint8_t adpcm_ms_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 300 of file adpcmenc.c.

adpcm_yamaha_compress_sample()

static uint8_t adpcm_yamaha_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 329 of file adpcmenc.c.

adpcm_compress_trellis()

static void adpcm_compress_trellis ( AVCodecContext *  avctx, const int16_t *  samples, uint8_t *  dst, ADPCMChannelStatus *  c, int  n, int  stride  )

static

Definition at line 351 of file adpcmenc.c.

adpcm_encode_frame()

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

static

Definition at line 585 of file adpcmenc.c.

Variable Documentation

sample_fmts

enum AVSampleFormat sample_fmts[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
}

Definition at line 948 of file adpcmenc.c.

Referenced by aeval_query_formats(), asink_query_formats(), configure_audio_filters(), lavfi_read_header(), new_stream_audio(), print_codec(), and query_formats().

sample_fmts_p

enum AVSampleFormat sample_fmts_p[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE
}

Definition at line 952 of file adpcmenc.c.

ch_layouts

const AVChannelLayout ch_layouts[]

static

Initial value:

= {
    AV_CHANNEL_LAYOUT_MONO,
    AV_CHANNEL_LAYOUT_STEREO,
    { 0 },
}

Definition at line 956 of file adpcmenc.c.

Referenced by ff_make_channel_layout_list().

options

const AVOption options[]

static

Initial value:

= {
    {
        .name        = "block_size",
        .help        = "set the block size",
        .offset      = 0x42,
        .type        = AV_OPT_TYPE_INT,
        .default_val = {.i64 = 1024},
        .min         = 32,
        .max         = 8192, 
        .flags       = AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
    },
    { NULL }
}

Definition at line 962 of file adpcmenc.c.

adpcm_encoder_class

const AVClass adpcm_encoder_class

static

Initial value:

= {
    .class_name = "ADPCM encoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 976 of file adpcmenc.c.