41 subbands[0] = low_subband_input + high_subband_input;
42 subbands[1] = low_subband_input - high_subband_input;
59 int32_t intermediate_samples[4];
63 for (
i = 0;
i < 2;
i++)
66 subband_samples[2*
i+0],
67 subband_samples[2*
i+1],
68 &intermediate_samples[2*
i]);
71 for (
i = 0;
i < 2;
i++)
74 intermediate_samples[0+
i],
75 intermediate_samples[2+
i],
85 subband_samples[subband] =
channel->prediction[subband].previous_reconstructed_sample;
95 channel->quantize[3].quantized_sample = (
channel->quantize[3].quantized_sample & ~1)
105 channel->quantize[3].quantized_sample = (
channel->quantize[3].quantized_sample & ~1)
136 int *got_frame_ptr,
AVPacket *avpkt)
142 if (avpkt->
size <
s->block_size) {
172 #if CONFIG_APTX_DECODER
189 #if CONFIG_APTX_HD_DECODER
AVCodec ff_aptx_hd_decoder
av_cold int ff_aptx_init(AVCodecContext *avctx)
void ff_aptx_invert_quantize_and_prediction(Channel *channel, int hd)
void ff_aptx_generate_dither(Channel *channel)
static av_always_inline void aptx_qmf_filter_signal_push(FilterSignal *signal, int32_t sample)
static const int32_t aptx_qmf_outer_coeffs[NB_FILTERS][FILTER_TAPS]
static int aptx_check_parity(Channel channels[NB_CHANNELS], int32_t *idx)
static int32_t aptx_quantized_parity(Channel *channel)
static const int32_t aptx_qmf_inner_coeffs[NB_FILTERS][FILTER_TAPS]
static av_always_inline int32_t aptx_qmf_convolution(FilterSignal *signal, const int32_t coeffs[FILTER_TAPS], int shift)
static av_cold int init(AVCodecContext *avctx)
static const uint16_t channel_layouts[7]
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
channel
Use these values when setting the channel map with ebur128_set_channel().
#define AV_CH_LAYOUT_STEREO
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
AVSampleFormat
Audio sample formats.
@ AV_SAMPLE_FMT_S32P
signed 32 bits, planar
static void aptx_decode_channel(Channel *channel, int32_t samples[4])
static int aptx_decode_samples(AptXContext *ctx, const uint8_t *input, int32_t samples[NB_CHANNELS][4])
static void aptx_qmf_tree_synthesis(QMFAnalysis *qmf, int32_t subband_samples[4], int32_t samples[4])
static void aptxhd_unpack_codeword(Channel *channel, uint32_t codeword)
static void aptx_unpack_codeword(Channel *channel, uint16_t codeword)
static av_always_inline void aptx_qmf_polyphase_synthesis(FilterSignal signal[NB_FILTERS], const int32_t coeffs[NB_FILTERS][FILTER_TAPS], int shift, int32_t low_subband_input, int32_t high_subband_input, int32_t samples[NB_FILTERS])
static int aptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static av_const int sign_extend(int val, unsigned bits)
static int shift(int a, int b)
main external API structure.
const char * name
Name of the codec implementation.
This structure describes decoded (raw) audio or video data.
int nb_samples
number of audio samples (per channel) described by this frame
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int channels
number of audio channels, only used for audio.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
This structure stores compressed data.
FilterSignal inner_filter_signal[NB_FILTERS][NB_FILTERS]
FilterSignal outer_filter_signal[NB_FILTERS]