21 #define BITSTREAM_WRITER_LE 75 const int16_t *ptr = (
const int16_t *)frame->
data[0];
79 ret = ptr[sample] >> 8;
94 cur_chan = 0, res = 0, samples = 0;
100 for (i = 0; i < avctx->
channels; i++) {
110 uint32_t k, unary, outval;
123 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k)) 133 outval = (value > 0) ? (value << 1) - 1: -value << 1;
137 rice->
sum0 += outval - (rice->
sum0 >> 4);
147 rice->
sum1 += outval - (rice->
sum1 >> 4);
153 unary = 1 + (outval >> k);
155 if (pkt_size < INT_MAX/2) {
190 avpkt->
size = out_bytes + 4;
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
This structure describes decoded (raw) audio or video data.
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
#define AV_LOG_WARNING
Something somehow does not look correct.
static av_cold int init(AVCodecContext *avctx)
static int32_t get_sample(const AVFrame *frame, int sample, enum AVSampleFormat format)
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
enum AVSampleFormat sample_fmt
audio sample format
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
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
GLsizei GLboolean const GLfloat * value
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Public header for CRC hash function implementation.
av_cold void ff_ttaencdsp_init(TTAEncDSPContext *c)
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
static int put_bits_left(PutBitContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
const char * name
Name of the codec implementation.
static av_cold int tta_encode_close(AVCodecContext *avctx)
const uint32_t ff_tta_shift_1[]
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
const uint32_t *const ff_tta_shift_16
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
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 put_bytes_output(const PutBitContext *s)
int frame_size
Number of samples per channel in an audio frame.
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
int sample_rate
samples per second
const uint8_t ff_tta_filter_configs[]
main external API structure.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
static av_cold int tta_encode_init(AVCodecContext *avctx)
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
int channels
number of audio channels
static enum AVSampleFormat sample_fmts[]
Filter the word “frame” indicates either a video frame or a group of audio samples
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
#define av_malloc_array(a, b)
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
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
void(* filter_process)(int32_t *qm, int32_t *dx, int32_t *dl, int32_t *error, int32_t *in, int32_t shift, int32_t round)
static int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...