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/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_tffat_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, 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

#define kAudioFormatEnhancedAC3   'ec-3'

Definition at line 36 of file audiotoolboxdec.c.

Referenced by ffat_get_format_id().

#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) { \
for (c = 0; c < avctx->channels; c++) \
out_ptr[c] = in_ptr[at->channel_map[c]]; \
}
GLint GLenum type
Definition: opengl_enc.c:104
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
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
int
for(j=16;j >0;--j)

Definition at line 454 of file audiotoolboxdec.c.

Referenced by ffat_copy_samples().

#define FFAT_DEC_CLASS (   NAME)
Value:
static const AVClass ffat_##NAME##_dec_class = { \
.class_name = "at_" #NAME "_dec", \
.version = LIBAVUTIL_VERSION_INT, \
};
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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:72
Describe the class of an AVClass context structure.
Definition: log.h:67

Definition at line 578 of file audiotoolboxdec.c.

#define FFAT_DEC (   NAME,
  ID,
  bsf_name 
)
Value:
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, \
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, \
.wrapper_name = "at", \
};
#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:48
static void flush(AVCodecContext *avctx)
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#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:75
#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:40
static av_cold void ffat_decode_flush(AVCodecContext *avctx)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define FFAT_DEC_CLASS(NAME)
static av_cold int ffat_init_decoder(AVCodecContext *avctx)
#define ID(x)
Definition: cast5.c:29
static int ffat_decode(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
static av_cold int ffat_close_decoder(AVCodecContext *avctx)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50

Definition at line 584 of file audiotoolboxdec.c.

Function Documentation

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

Definition at line 56 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

static int ffat_get_channel_id ( AudioChannelLabel  label)
static

Definition at line 95 of file audiotoolboxdec.c.

Referenced by ffat_compare_channel_descriptions(), and ffat_update_ctx().

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

Definition at line 123 of file audiotoolboxdec.c.

Referenced by ffat_update_ctx().

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

Definition at line 130 of file audiotoolboxdec.c.

Referenced by ffat_update_ctx().

static int ffat_update_ctx ( AVCodecContext avctx)
static

Definition at line 158 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

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

Definition at line 218 of file audiotoolboxdec.c.

Referenced by ffat_get_magic_cookie().

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

Definition at line 227 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder(), and ffat_set_extradata().

static av_cold int ffat_usable_extradata ( AVCodecContext avctx)
static

Definition at line 267 of file audiotoolboxdec.c.

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

static int ffat_set_extradata ( AVCodecContext avctx)
static

Definition at line 277 of file audiotoolboxdec.c.

Referenced by ffat_create_decoder().

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

Definition at line 299 of file audiotoolboxdec.c.

Referenced by ffat_decode(), and ffat_init_decoder().

static av_cold int ffat_init_decoder ( AVCodecContext avctx)
static

Definition at line 398 of file audiotoolboxdec.c.

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

Definition at line 415 of file audiotoolboxdec.c.

Referenced by ffat_decode().

static void ffat_copy_samples ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 464 of file audiotoolboxdec.c.

Referenced by ffat_decode().

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

Definition at line 474 of file audiotoolboxdec.c.

static av_cold void ffat_decode_flush ( AVCodecContext avctx)
static

Definition at line 558 of file audiotoolboxdec.c.

static av_cold int ffat_close_decoder ( AVCodecContext avctx)
static

Definition at line 566 of file audiotoolboxdec.c.