40 #define BITSTREAM_READER_LE 67 float *aptr, *bptr, *pptr,
val, pval;
89 for (i = 0; i < 2; i++) {
105 memset(&aptr[NELLY_FILL_LEN], 0,
106 (NELLY_BUF_LEN - NELLY_FILL_LEN) *
sizeof(
float));
142 int *got_frame_ptr,
AVPacket *avpkt)
146 int buf_size = avpkt->
size;
160 buf_size % NELLY_BLOCK_LEN);
167 samples_flt = (
float *)frame->
data[0];
169 for (i=0 ; i<blocks ; i++) {
190 .
name =
"nellymoser",
Context structure for the Lagged Fibonacci PRNG.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
static av_cold int init(AVCodecContext *avctx)
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
const float ff_nelly_dequantization_table[127]
static av_cold int decode_end(AVCodecContext *avctx)
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define NELLY_DETAIL_BITS
const uint16_t ff_nelly_init_table[64]
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
enum AVSampleFormat sample_fmt
audio sample format
The exact code depends on how similar the blocks are and how related they are to the block
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
bitstream reader API header.
static int decode_tag(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
void(* vector_fmul_window)(float *dst, const float *src0, const float *src1, const float *win, int len)
Overlap/add with window function.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int flags
AV_CODEC_FLAG_*.
const char * name
Name of the codec implementation.
uint64_t channel_layout
Audio channel layout.
AVCodec ff_nellymoser_decoder
audio channel layout utility functions
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS]
#define NELLY_HEADER_BITS
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
static void nelly_decode_block(NellyMoserDecodeContext *s, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
static av_cold int decode_init(AVCodecContext *avctx)
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
void(* imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
float imdct_buf[2][NELLY_BUF_LEN]
common internal api header.
#define AV_CODEC_CAP_PARAM_CHANGE
Codec supports changed parameters at any point.
int channels
number of audio channels
const int16_t ff_nelly_delta_table[32]
static enum AVSampleFormat sample_fmts[]
#define FFSWAP(type, a, b)
void ff_nelly_get_sample_bits(const float *buf, int *bits)
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
#define AV_CH_LAYOUT_MONO
The 3 alphanumeric copyright notices are md5summed they are from the original implementors.
static double val(void *priv, double ch)
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators...
void ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows