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
129 for (chan = 0; chan < s->
channels; chan++) {
137 "s->blocksize + s->nwrap too large\n");
145 s->
offset[chan] = tmp_ptr;
152 for (i = 0; i < s->
nwrap; i++)
201 for (chan = 0; chan < s->
channels; chan++)
202 for (i = 0; i < nblock; i++)
203 s->
offset[chan][i] = mean;
216 if (bytestream2_get_le32(&gb) !=
MKTAG(
'R',
'I',
'F',
'F')) {
223 if (bytestream2_get_le32(&gb) !=
MKTAG(
'W',
'A',
'V',
'E')) {
228 while (bytestream2_get_le32(&gb) !=
MKTAG(
'f',
'm',
't',
' ')) {
229 len = bytestream2_get_le32(&gb);
236 len = bytestream2_get_le32(&gb);
243 wave_format = bytestream2_get_le16(&gb);
245 switch (wave_format) {
257 bps = bytestream2_get_le16(&gb);
260 if (bps != 16 && bps != 8) {
280 int residual_size,
int32_t coffset)
282 int pred_order, sum, qshift, init_sum, i, j;
288 if (pred_order > s->
nwrap) {
294 for (i = 0; i < pred_order; i++)
312 if (command ==
FN_QLPC && coffset)
313 for (i = -pred_order; i < 0; i++)
314 s->
decoded[channel][i] -= coffset;
320 for (j = 0; j < pred_order; j++)
321 sum += coeffs[j] * s->
decoded[channel][i - j - 1];
327 if (command ==
FN_QLPC && coffset)
329 s->
decoded[channel][i] += coffset;
370 "invalid or unsupported block size: %d\n",
396 "missing verbatim section at beginning of stream\n");
423 int *got_frame_ptr,
AVPacket *avpkt)
427 int buf_size = avpkt->
size;
429 int i, input_buf_size = 0;
448 input_buf_size = buf_size;
465 if (buf_size < s->max_framesize && avpkt->
data) {
467 return input_buf_size;
521 "Increasing block size is not supported\n");
526 "block size: %d\n", blocksize);
542 int residual_size = 0;
557 coffset = s->
offset[channel][0];
561 sum += s->
offset[channel][i];
562 coffset = sum / s->
nmean;
573 residual_size, coffset)) < 0)
593 for (i = -s->
nwrap; i < 0; i++)
604 int16_t *samples_s16;
612 for (chan = 0; chan < s->
channels; chan++) {
618 *samples_u8++ = av_clip_uint8(s->
decoded[chan][i]);
622 *samples_s16++ = av_clip_int16(s->
decoded[chan][i]);
647 return input_buf_size;
static const int16_t coeffs[28]
#define AVERROR_PATCHWELCOME
This structure describes decoded (raw) audio or video 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]
uint8_t ** extended_data
pointers to the data planes/channels.
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
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
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
if((e=av_dict_get(options,"", NULL, AV_DICT_IGNORE_SUFFIX)))
static av_cold int shorten_decode_init(AVCodecContext *avctx)
enum AVSampleFormat sample_fmt
audio sample format
const char * name
Name of the codec implementation.
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
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.
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)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
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)
Libavcodec external API header.
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
#define FF_ARRAY_ELEMS(a)
static int allocate_buffers(ShortenContext *s)
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
void * av_realloc(void *ptr, size_t size) 1(2)
Allocate or reallocate a block of memory.
#define VERBATIM_BYTE_SIZE
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.
AVSampleFormat
Audio Sample Formats.
#define AV_LOG_INFO
Standard information.
int sample_rate
samples per second
uint8_t header[OUT_BUFFER_SIZE]
#define CANONICAL_HEADER_SIZE
main external API structure.
static void close(AVCodecParserContext *s)
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)
#define MKTAG(a, b, c, d)
static void skip_bits(GetBitContext *s, int n)
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
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 shorten_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
common internal api header.
int32_t * offset[MAX_CHANNELS]
#define AVERROR_INVALIDDATA
int channels
number of audio channels
static enum AVSampleFormat sample_fmts[]
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static const uint8_t is_audio_command[10]
indicates if the FN_* command is audio or non-audio
static int read_header(ShortenContext *s)
static unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
read unsigned golomb rice code (shorten).
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
static int get_sr_golomb_shorten(GetBitContext *gb, int k)
read signed golomb rice code (shorten).