FFmpeg
Data Structures | Macros | Functions
audiotoolboxdec.c File Reference
#include <AudioToolbox/AudioToolbox.h>
#include "config.h"
#include "avcodec.h"
#include "ac3_parser_internal.h"
#include "bytestream.h"
#include "internal.h"
#include "mpegaudiodecheader.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/log.h"

Go to the source code of this file.

Data Structures

struct  ATDecodeContext
 

Macros

#define kAudioFormatEnhancedAC3   'ec-3'
 
#define COPY_SAMPLES(type)
 
#define FFAT_DEC_CLASS(NAME)
 
#define FFAT_DEC(NAME, ID, bsf_name)
 

Functions

static UInt32 ffat_get_format_id (enum AVCodecID codec, int profile)
 
static int ffat_get_channel_id (AudioChannelLabel label)
 
static int ffat_compare_channel_descriptions (const void *a, const void *b)
 
static AudioChannelLayout * ffat_convert_layout (AudioChannelLayout *layout, UInt32 *size)
 
static int ffat_update_ctx (AVCodecContext *avctx)
 
static void put_descr (PutByteContext *pb, int tag, unsigned int size)
 
static uint8_t * ffat_get_magic_cookie (AVCodecContext *avctx, UInt32 *cookie_size)
 
static av_cold int ffat_usable_extradata (AVCodecContext *avctx)
 
static int ffat_set_extradata (AVCodecContext *avctx)
 
static av_cold int ffat_create_decoder (AVCodecContext *avctx, const AVPacket *pkt)
 
static av_cold int ffat_init_decoder (AVCodecContext *avctx)
 
static OSStatus ffat_decode_callback (AudioConverterRef converter, UInt32 *nb_packets, AudioBufferList *data, AudioStreamPacketDescription **packets, void *inctx)
 
static void ffat_copy_samples (AVCodecContext *avctx, AVFrame *frame)
 
static int ffat_decode (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
 
static av_cold void ffat_decode_flush (AVCodecContext *avctx)
 
static av_cold int ffat_close_decoder (AVCodecContext *avctx)
 

Macro Definition Documentation

◆ kAudioFormatEnhancedAC3

#define kAudioFormatEnhancedAC3   'ec-3'

Definition at line 37 of file audiotoolboxdec.c.

◆ COPY_SAMPLES

#define COPY_SAMPLES (   type)
Value:
type *in_ptr = (type*)at->decoded_data; \
type *end_ptr = in_ptr + frame->nb_samples * avctx->channels; \
type *out_ptr = (type*)frame->data[0]; \
for (; in_ptr < end_ptr; in_ptr += avctx->channels, out_ptr += avctx->channels) { \
int c; \
for (c = 0; c < avctx->channels; c++) \
out_ptr[c] = in_ptr[at->channel_map[c]]; \
}

Definition at line 456 of file audiotoolboxdec.c.

◆ FFAT_DEC_CLASS

#define FFAT_DEC_CLASS (   NAME)
Value:
static const AVClass ffat_##NAME##_dec_class = { \
.class_name = "at_" #NAME "_dec", \
.version = LIBAVUTIL_VERSION_INT, \
};

Definition at line 575 of file audiotoolboxdec.c.

◆ FFAT_DEC

#define FFAT_DEC (   NAME,
  ID,
  bsf_name 
)
Value:
const AVCodec ff_##NAME##_at_decoder = { \
.name = #NAME "_at", \
.long_name = NULL_IF_CONFIG_SMALL(#NAME " (AudioToolbox)"), \
.type = AVMEDIA_TYPE_AUDIO, \
.id = ID, \
.priv_data_size = sizeof(ATDecodeContext), \
.close = ffat_close_decoder, \
.priv_class = &ffat_##NAME##_dec_class, \
.bsfs = bsf_name, \
.wrapper_name = "at", \
};

Definition at line 581 of file audiotoolboxdec.c.

Function Documentation

◆ ffat_get_format_id()

static UInt32 ffat_get_format_id ( enum AVCodecID  codec,
int  profile 
)
static

Definition at line 57 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

◆ ffat_get_channel_id()

static int ffat_get_channel_id ( AudioChannelLabel  label)
static

Definition at line 96 of file audiotoolboxdec.c.

Referenced by ffat_compare_channel_descriptions(), and ffat_update_ctx().

◆ ffat_compare_channel_descriptions()

static int ffat_compare_channel_descriptions ( const void *  a,
const void *  b 
)
static

Definition at line 124 of file audiotoolboxdec.c.

Referenced by ffat_update_ctx().

◆ ffat_convert_layout()

static AudioChannelLayout* ffat_convert_layout ( AudioChannelLayout *  layout,
UInt32 *  size 
)
static

Definition at line 131 of file audiotoolboxdec.c.

Referenced by ffat_update_ctx().

◆ ffat_update_ctx()

static int ffat_update_ctx ( AVCodecContext avctx)
static

Definition at line 159 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

◆ put_descr()

static void put_descr ( PutByteContext pb,
int  tag,
unsigned int  size 
)
static

Definition at line 219 of file audiotoolboxdec.c.

Referenced by ffat_get_magic_cookie().

◆ ffat_get_magic_cookie()

static uint8_t* ffat_get_magic_cookie ( AVCodecContext avctx,
UInt32 *  cookie_size 
)
static

Definition at line 228 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder(), and ffat_set_extradata().

◆ ffat_usable_extradata()

static av_cold int ffat_usable_extradata ( AVCodecContext avctx)
static

Definition at line 268 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder(), ffat_init_decoder(), and ffat_set_extradata().

◆ ffat_set_extradata()

static int ffat_set_extradata ( AVCodecContext avctx)
static

Definition at line 278 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

◆ ffat_create_decoder()

static av_cold int ffat_create_decoder ( AVCodecContext avctx,
const AVPacket pkt 
)
static

Definition at line 300 of file audiotoolboxdec.c.

Referenced by ffat_decode(), and ffat_init_decoder().

◆ ffat_init_decoder()

static av_cold int ffat_init_decoder ( AVCodecContext avctx)
static

Definition at line 400 of file audiotoolboxdec.c.

◆ ffat_decode_callback()

static OSStatus ffat_decode_callback ( AudioConverterRef  converter,
UInt32 *  nb_packets,
AudioBufferList *  data,
AudioStreamPacketDescription **  packets,
void *  inctx 
)
static

Definition at line 417 of file audiotoolboxdec.c.

Referenced by ffat_decode().

◆ ffat_copy_samples()

static void ffat_copy_samples ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 466 of file audiotoolboxdec.c.

Referenced by ffat_decode().

◆ ffat_decode()

static int ffat_decode ( AVCodecContext avctx,
void *  data,
int got_frame_ptr,
AVPacket avpkt 
)
static

Definition at line 476 of file audiotoolboxdec.c.

◆ ffat_decode_flush()

static av_cold void ffat_decode_flush ( AVCodecContext avctx)
static

Definition at line 555 of file audiotoolboxdec.c.

◆ ffat_close_decoder()

static av_cold int ffat_close_decoder ( AVCodecContext avctx)
static

Definition at line 563 of file audiotoolboxdec.c.

AVCodec
AVCodec.
Definition: codec.h:202
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
FFAT_DEC_CLASS
#define FFAT_DEC_CLASS(NAME)
Definition: audiotoolboxdec.c:575
ffat_close_decoder
static av_cold int ffat_close_decoder(AVCodecContext *avctx)
Definition: audiotoolboxdec.c:563
ffat_init_decoder
static av_cold int ffat_init_decoder(AVCodecContext *avctx)
Definition: audiotoolboxdec.c:400
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:593
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:109
ffat_decode
static int ffat_decode(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: audiotoolboxdec.c:476
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
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:117
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:50
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
frame
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 the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
ffat_decode_flush
static av_cold void ffat_decode_flush(AVCodecContext *avctx)
Definition: audiotoolboxdec.c:555
ATDecodeContext
Definition: audiotoolboxdec.c:40
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:82
ID
#define ID(x)
Definition: cast5.c:29