36 #define MAX_CHANNELS 8
37 #define MAX_BLOCKSIZE 65535
39 #define OUT_BUFFER_SIZE 16384
43 #define WAVE_FORMAT_PCM 0x0001
45 #define DEFAULT_BLOCK_SIZE 256
51 #define BITSHIFTSIZE 2
64 #define V2LPCQOFFSET (1 << LPCQUANT)
72 #define FN_BLOCKSIZE 5
81 #define VERBATIM_CKSIZE_SIZE 5
82 #define VERBATIM_BYTE_SIZE 8
83 #define CANONICAL_HEADER_SIZE 44
127 for (chan = 0; chan < s->
channels; chan++) {
134 "s->blocksize + s->nwrap too large\n");
146 for (i = 0; i < s->
nwrap; i++)
196 for (chan = 0; chan < s->
channels; chan++)
197 for (i = 0; i < nblock; i++)
198 s->
offset[chan][i] = mean;
211 if (bytestream2_get_le32(&gb) !=
MKTAG(
'R',
'I',
'F',
'F')) {
218 if (bytestream2_get_le32(&gb) !=
MKTAG(
'W',
'A',
'V',
'E')) {
223 while (bytestream2_get_le32(&gb) !=
MKTAG(
'f',
'm',
't',
' ')) {
224 len = bytestream2_get_le32(&gb);
231 len = bytestream2_get_le32(&gb);
238 wave_format = bytestream2_get_le16(&gb);
240 switch (wave_format) {
252 bps = bytestream2_get_le16(&gb);
255 if (bps != 16 && bps != 8) {
275 int residual_size,
int32_t coffset)
277 int pred_order, sum, qshift, init_sum, i, j;
283 if ((
unsigned)pred_order > s->
nwrap) {
289 for (i = 0; i < pred_order; i++)
307 if (command ==
FN_QLPC && coffset)
308 for (i = -pred_order; i < 0; i++)
309 s->
decoded[channel][i] -= coffset;
315 for (j = 0; j < pred_order; j++)
316 sum += coeffs[j] * (
unsigned)s->
decoded[channel][i - j - 1];
322 if (command ==
FN_QLPC && coffset)
324 s->
decoded[channel][i] += coffset;
365 "invalid or unsupported block size: %d\n",
372 if (maxnlpc > 1024
U) {
404 "missing verbatim section at beginning of stream\n");
431 int *got_frame_ptr,
AVPacket *avpkt)
435 int buf_size = avpkt->
size;
437 int i, input_buf_size = 0;
457 input_buf_size = buf_size;
474 if (buf_size < s->max_framesize && avpkt->
data) {
476 return input_buf_size;
538 "Increasing block size is not supported\n");
543 "block size: %d\n", blocksize);
559 int residual_size = 0;
574 coffset = s->
offset[channel][0];
578 sum += (
unsigned)s->
offset[channel][i];
579 coffset = sum / s->
nmean;
590 residual_size, coffset)) < 0)
610 for (i = -s->
nwrap; i < 0; i++)
621 int16_t *samples_s16;
629 for (chan = 0; chan < s->
channels; chan++) {
635 *samples_u8++ = av_clip_uint8(s->
decoded[chan][i]);
639 *samples_s16++ = av_clip_int16(s->
decoded[chan][i]);
664 return input_buf_size;
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
#define VERBATIM_CKSIZE_SIZE
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static int init_offset(ShortenContext *s)
static av_cold int init(AVCodecContext *avctx)
unsigned int allocated_bitstream_size
int32_t * decoded[MAX_CHANNELS]
static const int fixed_coeffs[][3]
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static int finish_frame(AVCodecContext *avctx, AVFrame *pict)
AVCodec ff_shorten_decoder
static av_cold int shorten_decode_init(AVCodecContext *avctx)
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
enum AVSampleFormat sample_fmt
audio sample format
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header, int header_size)
static int get_bits_count(const GetBitContext *s)
bitstream reader API header.
static const uint8_t header[24]
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
static av_unused const uint8_t * skip_bytes(CABACContext *c, int n)
Skip n bytes and reset the decoder.
int32_t * decoded_base[MAX_CHANNELS]
static int get_bits_left(GetBitContext *gb)
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given block if it is not large enough, otherwise do nothing.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
const char * name
Name of the codec implementation.
Libavcodec external API header.
static int allocate_buffers(ShortenContext *s)
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
#define VERBATIM_BYTE_SIZE
#define FF_ARRAY_ELEMS(a)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
#define AV_LOG_INFO
Standard information.
AVSampleFormat
Audio sample formats.
int sample_rate
samples per second
uint8_t header[OUT_BUFFER_SIZE]
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
#define CANONICAL_HEADER_SIZE
main external API structure.
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static av_cold int shorten_decode_close(AVCodecContext *avctx)
static void skip_bits(GetBitContext *s, int n)
static int decode_subframe_lpc(ShortenContext *s, int command, int channel, int residual_size, int32_t coffset)
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
static unsigned int get_uint(ShortenContext *s, int k)
#define DEFAULT_BLOCK_SIZE
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
static int shorten_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
common internal api header.
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
int32_t * offset[MAX_CHANNELS]
static const int16_t coeffs[]
int channels
number of audio channels
static enum AVSampleFormat sample_fmts[]
static const uint8_t is_audio_command[10]
indicates if the FN_* command is audio or non-audio
static int read_header(ShortenContext *s)
uint8_t ** extended_data
pointers to the data planes/channels.
static unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
read unsigned golomb rice code (shorten).
#define MKTAG(a, b, c, d)
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() for allocating buffers and supports custom allocators.
static int get_sr_golomb_shorten(GetBitContext *gb, int k)
read signed golomb rice code (shorten).