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40 #define BITSTREAM_READER_LE
68 float *aptr, *bptr, *pptr,
val, pval;
80 pval = -
exp2(
val/2048) *
s->scale_bias;
90 for (
i = 0;
i < 2;
i++) {
109 s->imdct_fn(
s->imdct_ctx,
s->imdct_out, aptr,
sizeof(
float));
111 s->imdct_out, ff_sine_128,
113 FFSWAP(
float *,
s->imdct_out,
s->imdct_prev);
124 s->imdct_out =
s->imdct_buf[0];
125 s->imdct_prev =
s->imdct_buf[1];
128 1, 128, &
scale, 0)) < 0)
135 s->scale_bias = 1.0/(32768*8);
148 int *got_frame_ptr,
AVPacket *avpkt)
150 const uint8_t *buf = avpkt->
data;
151 int buf_size = avpkt->
size;
172 samples_flt = (
float *)
frame->data[0];
174 for (
i=0 ;
i<blocks ;
i++) {
195 .
p.
name =
"nellymoser",
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
#define NELLY_HEADER_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
static av_cold int decode_init(AVCodecContext *avctx)
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
This structure describes decoded (raw) audio or video data.
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
const FFCodec ff_nellymoser_decoder
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
AVCodec p
The public AVCodec.
AVChannelLayout ch_layout
Audio channel layout.
const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS]
int flags
AV_CODEC_FLAG_*.
static double val(void *priv, double ch)
static av_always_inline float scale(float x, float s)
const float ff_nelly_dequantization_table[127]
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
@ AV_TX_FLOAT_MDCT
Standard MDCT with a sample data type of float, double or int32_t, respecively.
#define FF_CODEC_DECODE_CB(func)
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
int(* init)(AVBSFContext *ctx)
const uint16_t ff_nelly_init_table[64]
#define CODEC_LONG_NAME(str)
const int16_t ff_nelly_delta_table[32]
float imdct_buf[2][NELLY_BUF_LEN]
#define NELLY_DETAIL_BITS
static av_cold int decode_end(AVCodecContext *avctx)
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Context structure for the Lagged Fibonacci PRNG.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
An AVChannelLayout holds information about the channel layout of audio data.
#define DECLARE_ALIGNED(n, t, v)
enum AVSampleFormat sample_fmt
audio sample format
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets *ctx to NULL, does nothing when *ctx == NULL.
#define i(width, name, range_min, range_max)
AVSampleFormat
Audio sample formats.
const char * name
Name of the codec implementation.
#define FFSWAP(type, a, b)
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 int decode_tag(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
main external API structure.
void ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
static void nelly_decode_block(NellyMoserDecodeContext *s, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
#define AV_CODEC_CAP_PARAM_CHANGE
Codec supports changed parameters at any point.
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
#define AV_CHANNEL_LAYOUT_MONO
This structure stores compressed data.
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
The exact code depends on how similar the blocks are and how related they are to the block
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
void ff_nelly_get_sample_bits(const float *buf, int *bits)