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21 #define BITSTREAM_WRITER_LE
77 const int16_t *ptr = (
const int16_t *)
frame->data[0];
96 cur_chan = 0, res = 0,
samples = 0;
103 s->ch_ctx[
i].predictor = 0;
112 uint32_t k, unary, outval;
118 if (cur_chan < avctx->ch_layout.nb_channels - 1)
125 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
127 case 1:
value -=
PRED(
c->predictor, 4);
break;
129 case 3:
value -=
PRED(
c->predictor, 5);
break;
139 rice->
sum0 += outval - (rice->
sum0 >> 4);
149 rice->
sum1 += outval - (rice->
sum1 >> 4);
155 unary = 1 + (outval >> k);
157 if (pkt_size < INT_MAX/2) {
180 if (cur_chan < avctx->ch_layout.nb_channels - 1)
192 avpkt->
size = out_bytes + 4;
int frame_size
Number of samples per channel in an audio frame.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
#define AV_LOG_WARNING
Something somehow does not look correct.
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 int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
static int put_bytes_output(const PutBitContext *s)
int sample_rate
samples per second
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
This structure describes decoded (raw) audio or video data.
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
av_cold void ff_ttaencdsp_init(TTAEncDSPContext *c)
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
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
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
int nb_channels
Number of channels in this layout.
AVCodec p
The public AVCodec.
AVChannelLayout ch_layout
Audio channel layout.
static int put_bits_left(PutBitContext *s)
#define FF_CODEC_ENCODE_CB(func)
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
static av_cold int tta_encode_close(AVCodecContext *avctx)
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 format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
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
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
enum AVSampleFormat sample_fmt
audio sample format
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
const uint32_t ff_tta_shift_1[]
#define i(width, name, range_min, range_max)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
const uint32_t *const ff_tta_shift_16
const uint8_t ff_tta_filter_configs[]
#define av_malloc_array(a, b)
AVSampleFormat
Audio sample formats.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
@ AV_SAMPLE_FMT_S16
signed 16 bits
const char * name
Name of the codec implementation.
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
main external API structure.
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Filter the word “frame” indicates either a video frame or a group of audio samples
const FFCodec ff_tta_encoder
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
This structure stores compressed data.
static int32_t get_sample(const AVFrame *frame, int sample, enum AVSampleFormat format)
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
@ AV_SAMPLE_FMT_S32
signed 32 bits
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
static av_cold int tta_encode_init(AVCodecContext *avctx)