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/*
* Shorten decoder
* Copyright (c) 2005 Jeff Muizelaar
* |
b78e7197 |
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
85ad5695 |
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
b78e7197 |
* version 2.1 of the License, or (at your option) any later version. |
85ad5695 |
* |
b78e7197 |
* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public |
b78e7197 |
* License along with FFmpeg; if not, write to the Free Software |
5509bffa |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
/** |
ba87f080 |
* @file |
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* Shorten decoder
* @author Jeff Muizelaar
*
*/
#include <limits.h>
#include "avcodec.h" |
069ada46 |
#include "bytestream.h" |
9106a698 |
#include "get_bits.h" |
85ad5695 |
#include "golomb.h" |
594d4d5d |
#include "internal.h" |
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#define MAX_CHANNELS 8
#define MAX_BLOCKSIZE 65535
#define OUT_BUFFER_SIZE 16384
#define ULONGSIZE 2
#define WAVE_FORMAT_PCM 0x0001
#define DEFAULT_BLOCK_SIZE 256
#define TYPESIZE 4
#define CHANSIZE 0
#define LPCQSIZE 2
#define ENERGYSIZE 3
#define BITSHIFTSIZE 2
|
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#define TYPE_S8 1
#define TYPE_U8 2 |
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#define TYPE_S16HL 3 |
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#define TYPE_U16HL 4 |
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#define TYPE_S16LH 5 |
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#define TYPE_U16LH 6 |
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#define NWRAP 3
#define NSKIPSIZE 1
#define LPCQUANT 5
#define V2LPCQOFFSET (1 << LPCQUANT)
#define FNSIZE 2
#define FN_DIFF0 0
#define FN_DIFF1 1
#define FN_DIFF2 2
#define FN_DIFF3 3
#define FN_QUIT 4
#define FN_BLOCKSIZE 5
#define FN_BITSHIFT 6
#define FN_QLPC 7
#define FN_ZERO 8
#define FN_VERBATIM 9
|
9000b6db |
/** indicates if the FN_* command is audio or non-audio */
static const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 };
|
85ad5695 |
#define VERBATIM_CKSIZE_SIZE 5
#define VERBATIM_BYTE_SIZE 8
#define CANONICAL_HEADER_SIZE 44
typedef struct ShortenContext {
AVCodecContext *avctx;
GetBitContext gb;
int min_framesize, max_framesize; |
5cf7c727 |
unsigned channels; |
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int32_t *decoded[MAX_CHANNELS]; |
18bcfc91 |
int32_t *decoded_base[MAX_CHANNELS]; |
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int32_t *offset[MAX_CHANNELS]; |
02591641 |
int *coeffs; |
85ad5695 |
uint8_t *bitstream;
int bitstream_size;
int bitstream_index; |
f038fe8b |
unsigned int allocated_bitstream_size; |
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int header_size;
uint8_t header[OUT_BUFFER_SIZE];
int version;
int cur_chan;
int bitshift;
int nmean;
int internal_ftype;
int nwrap;
int blocksize;
int bitindex;
int32_t lpcqoffset; |
d03f9f65 |
int got_header; |
1baa25c7 |
int got_quit_command; |
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} ShortenContext;
|
a2ad554d |
static av_cold int shorten_decode_init(AVCodecContext *avctx) |
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{
ShortenContext *s = avctx->priv_data; |
a2ad554d |
s->avctx = avctx; |
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return 0;
}
|
3a1a7e32 |
static int allocate_buffers(ShortenContext *s) |
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{ |
9b8d11a7 |
int i, chan, err; |
02591641 |
|
a2ad554d |
for (chan = 0; chan < s->channels; chan++) {
if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) { |
3a1a7e32 |
av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
3a1a7e32 |
} |
a2ad554d |
if (s->blocksize + s->nwrap >= UINT_MAX / sizeof(int32_t) ||
s->blocksize + s->nwrap <= (unsigned)s->nwrap) {
av_log(s->avctx, AV_LOG_ERROR,
"s->blocksize + s->nwrap too large\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
3a1a7e32 |
}
|
9b8d11a7 |
if ((err = av_reallocp(&s->offset[chan],
sizeof(int32_t) *
FFMAX(1, s->nmean))) < 0)
return err;
if ((err = av_reallocp(&s->decoded_base[chan], (s->blocksize + s->nwrap) *
sizeof(s->decoded_base[0][0]))) < 0)
return err; |
a2ad554d |
for (i = 0; i < s->nwrap; i++) |
18bcfc91 |
s->decoded_base[chan][i] = 0;
s->decoded[chan] = s->decoded_base[chan] + s->nwrap; |
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} |
02591641 |
|
9b8d11a7 |
if ((err = av_reallocp(&s->coeffs, s->nwrap * sizeof(*s->coeffs))) < 0)
return err; |
02591641 |
|
3a1a7e32 |
return 0; |
85ad5695 |
}
static inline unsigned int get_uint(ShortenContext *s, int k)
{
if (s->version != 0)
k = get_ur_golomb_shorten(&s->gb, ULONGSIZE);
return get_ur_golomb_shorten(&s->gb, k);
}
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
{
int i;
if (s->bitshift != 0)
for (i = 0; i < s->blocksize; i++) |
f42b3195 |
buffer[i] <<= s->bitshift; |
85ad5695 |
}
|
8562d9bd |
static int init_offset(ShortenContext *s) |
85ad5695 |
{
int32_t mean = 0; |
a2ad554d |
int chan, i; |
85ad5695 |
int nblock = FFMAX(1, s->nmean);
/* initialise offset */ |
a2ad554d |
switch (s->internal_ftype) { |
09131ebb |
case TYPE_U8:
s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
mean = 0x80;
break; |
a2ad554d |
case TYPE_S16HL:
case TYPE_S16LH: |
09131ebb |
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
a2ad554d |
break;
default: |
09131ebb |
av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
return AVERROR_PATCHWELCOME; |
85ad5695 |
}
for (chan = 0; chan < s->channels; chan++)
for (i = 0; i < nblock; i++)
s->offset[chan][i] = mean; |
8562d9bd |
return 0; |
85ad5695 |
}
|
069ada46 |
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
int header_size) |
85ad5695 |
{ |
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int len, bps; |
85ad5695 |
short wave_format; |
49568851 |
GetByteContext gb; |
069ada46 |
|
49568851 |
bytestream2_init(&gb, header, header_size);
if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) { |
85ad5695 |
av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
85ad5695 |
}
|
49568851 |
bytestream2_skip(&gb, 4); /* chunk size */ |
85ad5695 |
|
49568851 |
if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) { |
85ad5695 |
av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
85ad5695 |
}
|
49568851 |
while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) {
len = bytestream2_get_le32(&gb);
bytestream2_skip(&gb, len); |
4caf8c51 |
if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) { |
b26742cc |
av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n");
return AVERROR_INVALIDDATA;
} |
85ad5695 |
} |
49568851 |
len = bytestream2_get_le32(&gb); |
85ad5695 |
if (len < 16) {
av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
85ad5695 |
}
|
49568851 |
wave_format = bytestream2_get_le16(&gb); |
85ad5695 |
switch (wave_format) { |
a2ad554d |
case WAVE_FORMAT_PCM:
break;
default:
av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n"); |
4c364eb2 |
return AVERROR(ENOSYS); |
85ad5695 |
}
|
49568851 |
bytestream2_skip(&gb, 2); // skip channels (already got from shorten header)
avctx->sample_rate = bytestream2_get_le32(&gb);
bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate)
bytestream2_skip(&gb, 2); // skip block align (not needed) |
a44d35d9 |
bps = bytestream2_get_le16(&gb); |
b7159877 |
avctx->bits_per_coded_sample = bps; |
85ad5695 |
|
b7159877 |
if (bps != 16 && bps != 8) {
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps); |
4c364eb2 |
return AVERROR(ENOSYS); |
85ad5695 |
}
len -= 16;
if (len > 0)
av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
return 0;
}
|
b2148fac |
static const int fixed_coeffs[][3] = {
{ 0, 0, 0 }, |
15d146c9 |
{ 1, 0, 0 },
{ 2, -1, 0 },
{ 3, -3, 1 }
};
static int decode_subframe_lpc(ShortenContext *s, int command, int channel, |
fe31a637 |
int residual_size, int32_t coffset) |
85ad5695 |
{ |
15d146c9 |
int pred_order, sum, qshift, init_sum, i, j;
const int *coeffs;
if (command == FN_QLPC) {
/* read/validate prediction order */
pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
if (pred_order > s->nwrap) { |
a2ad554d |
av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
pred_order); |
15d146c9 |
return AVERROR(EINVAL);
}
/* read LPC coefficients */ |
a2ad554d |
for (i = 0; i < pred_order; i++) |
15d146c9 |
s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
coeffs = s->coeffs;
qshift = LPCQUANT;
} else {
/* fixed LPC coeffs */
pred_order = command; |
5f5ada3d |
if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) { |
b2148fac |
av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
pred_order);
return AVERROR_INVALIDDATA;
}
coeffs = fixed_coeffs[pred_order]; |
15d146c9 |
qshift = 0; |
fe31a637 |
} |
85ad5695 |
|
fe31a637 |
/* subtract offset from previous samples to use in prediction */ |
15d146c9 |
if (command == FN_QLPC && coffset) |
fe31a637 |
for (i = -pred_order; i < 0; i++)
s->decoded[channel][i] -= coffset; |
85ad5695 |
|
fe31a637 |
/* decode residual and do LPC prediction */ |
15d146c9 |
init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset; |
a2ad554d |
for (i = 0; i < s->blocksize; i++) { |
15d146c9 |
sum = init_sum; |
a2ad554d |
for (j = 0; j < pred_order; j++)
sum += coeffs[j] * s->decoded[channel][i - j - 1];
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
(sum >> qshift); |
85ad5695 |
} |
fe31a637 |
/* add offset to current samples */ |
15d146c9 |
if (command == FN_QLPC && coffset) |
fe31a637 |
for (i = 0; i < s->blocksize; i++)
s->decoded[channel][i] += coffset;
return 0; |
85ad5695 |
}
|
a1f7885a |
static int read_header(ShortenContext *s)
{ |
a8055992 |
int i, ret; |
a1f7885a |
int maxnlpc = 0;
/* shorten signature */
if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) {
av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
a1f7885a |
}
|
a2ad554d |
s->lpcqoffset = 0;
s->blocksize = DEFAULT_BLOCK_SIZE;
s->nmean = -1;
s->version = get_bits(&s->gb, 8); |
a1f7885a |
s->internal_ftype = get_uint(s, TYPESIZE);
s->channels = get_uint(s, CHANSIZE); |
5cf7c727 |
if (!s->channels) {
av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n");
return AVERROR_INVALIDDATA;
}
if (s->channels > MAX_CHANNELS) { |
a1f7885a |
av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels); |
4f127915 |
s->channels = 0; |
6b11ae71 |
return AVERROR_INVALIDDATA; |
a1f7885a |
} |
07745485 |
s->avctx->channels = s->channels; |
a1f7885a |
/* get blocksize if version > 0 */
if (s->version > 0) { |
5cf7c727 |
int skip_bytes;
unsigned blocksize; |
cfa317f6 |
blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
if (!blocksize || blocksize > MAX_BLOCKSIZE) { |
a2ad554d |
av_log(s->avctx, AV_LOG_ERROR,
"invalid or unsupported block size: %d\n", |
cfa317f6 |
blocksize);
return AVERROR(EINVAL);
}
s->blocksize = blocksize;
|
a2ad554d |
maxnlpc = get_uint(s, LPCQSIZE); |
a1f7885a |
s->nmean = get_uint(s, 0);
skip_bytes = get_uint(s, NSKIPSIZE); |
a2ad554d |
for (i = 0; i < skip_bytes; i++) |
a1f7885a |
skip_bits(&s->gb, 8);
}
s->nwrap = FFMAX(NWRAP, maxnlpc);
|
a8055992 |
if ((ret = allocate_buffers(s)) < 0)
return ret; |
a1f7885a |
|
8562d9bd |
if ((ret = init_offset(s)) < 0)
return ret; |
a1f7885a |
if (s->version > 1)
s->lpcqoffset = V2LPCQOFFSET;
if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) { |
a2ad554d |
av_log(s->avctx, AV_LOG_ERROR,
"missing verbatim section at beginning of stream\n"); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
a1f7885a |
}
s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE); |
a2ad554d |
if (s->header_size >= OUT_BUFFER_SIZE ||
s->header_size < CANONICAL_HEADER_SIZE) {
av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n",
s->header_size); |
6b11ae71 |
return AVERROR_INVALIDDATA; |
a1f7885a |
}
|
a2ad554d |
for (i = 0; i < s->header_size; i++) |
a1f7885a |
s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
|
6b11ae71 |
if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0)
return ret; |
a1f7885a |
s->cur_chan = 0;
s->bitshift = 0;
|
d03f9f65 |
s->got_header = 1;
|
a1f7885a |
return 0;
} |
85ad5695 |
|
0eea2129 |
static int shorten_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt) |
85ad5695 |
{ |
fed74c0a |
AVFrame *frame = data; |
7a00bbad |
const uint8_t *buf = avpkt->data; |
a2ad554d |
int buf_size = avpkt->size;
ShortenContext *s = avctx->priv_data; |
85ad5695 |
int i, input_buf_size = 0; |
45d7d31f |
int ret;
|
c25762fc |
/* allocate internal bitstream buffer */ |
a2ad554d |
if (s->max_framesize == 0) { |
9e5e2c2d |
void *tmp_ptr; |
09131ebb |
s->max_framesize = 8192; // should hopefully be enough for the first header |
9e5e2c2d |
tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, |
89d998f1 |
s->max_framesize + FF_INPUT_BUFFER_PADDING_SIZE); |
9e5e2c2d |
if (!tmp_ptr) {
av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
return AVERROR(ENOMEM);
} |
1486ed08 |
memset(tmp_ptr, 0, s->allocated_bitstream_size); |
9e5e2c2d |
s->bitstream = tmp_ptr; |
85ad5695 |
}
|
c25762fc |
/* append current packet data to bitstream buffer */ |
a2ad554d |
if (1 && s->max_framesize) { //FIXME truncated
buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size);
input_buf_size = buf_size;
|
ad22767c |
if (s->bitstream_index + s->bitstream_size + buf_size + FF_INPUT_BUFFER_PADDING_SIZE > |
a2ad554d |
s->allocated_bitstream_size) {
memmove(s->bitstream, &s->bitstream[s->bitstream_index],
s->bitstream_size);
s->bitstream_index = 0; |
85ad5695 |
} |
1baa25c7 |
if (buf) |
a2ad554d |
memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf,
buf_size);
buf = &s->bitstream[s->bitstream_index];
buf_size += s->bitstream_size;
s->bitstream_size = buf_size; |
85ad5695 |
|
1baa25c7 |
/* do not decode until buffer has at least max_framesize bytes or |
a2ad554d |
* the end of the file has been reached */ |
1baa25c7 |
if (buf_size < s->max_framesize && avpkt->data) { |
0eea2129 |
*got_frame_ptr = 0; |
85ad5695 |
return input_buf_size;
}
} |
c25762fc |
/* init and position bitstream reader */ |
a2ad554d |
init_get_bits(&s->gb, buf, buf_size * 8); |
7ae7300e |
skip_bits(&s->gb, s->bitindex); |
85ad5695 |
|
c25762fc |
/* process header or next subblock */ |
d03f9f65 |
if (!s->got_header) { |
a1f7885a |
if ((ret = read_header(s)) < 0)
return ret; |
0eea2129 |
*got_frame_ptr = 0; |
1baa25c7 |
goto finish_frame; |
85ad5695 |
}
|
1baa25c7 |
/* if quit command was read previously, don't decode anything */
if (s->got_quit_command) { |
0eea2129 |
*got_frame_ptr = 0; |
1baa25c7 |
return avpkt->size;
} |
85ad5695 |
|
1baa25c7 |
s->cur_chan = 0;
while (s->cur_chan < s->channels) { |
4839fbe2 |
unsigned cmd; |
85ad5695 |
int len;
|
a2ad554d |
if (get_bits_left(&s->gb) < 3 + FNSIZE) { |
0eea2129 |
*got_frame_ptr = 0; |
1baa25c7 |
break; |
85ad5695 |
}
cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
|
9000b6db |
if (cmd > FN_VERBATIM) {
av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd); |
0eea2129 |
*got_frame_ptr = 0; |
1baa25c7 |
break; |
85ad5695 |
}
|
9000b6db |
if (!is_audio_command[cmd]) {
/* process non-audio command */
switch (cmd) { |
a2ad554d |
case FN_VERBATIM:
len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
while (len--)
get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
break;
case FN_BITSHIFT:
s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
break;
case FN_BLOCKSIZE: { |
5cf7c727 |
unsigned blocksize = get_uint(s, av_log2(s->blocksize)); |
a2ad554d |
if (blocksize > s->blocksize) {
av_log(avctx, AV_LOG_ERROR,
"Increasing block size is not supported\n");
return AVERROR_PATCHWELCOME; |
9000b6db |
} |
a2ad554d |
if (!blocksize || blocksize > MAX_BLOCKSIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid or unsupported "
"block size: %d\n", blocksize);
return AVERROR(EINVAL);
}
s->blocksize = blocksize;
break;
}
case FN_QUIT:
s->got_quit_command = 1;
break; |
9000b6db |
} |
1baa25c7 |
if (cmd == FN_BLOCKSIZE || cmd == FN_QUIT) { |
0eea2129 |
*got_frame_ptr = 0; |
1baa25c7 |
break;
} |
9000b6db |
} else {
/* process audio command */ |
e9e37f2d |
int residual_size = 0;
int channel = s->cur_chan;
int32_t coffset; |
c25762fc |
/* get Rice code for residual decoding */ |
e9e37f2d |
if (cmd != FN_ZERO) {
residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE); |
511cf612 |
/* This is a hack as version 0 differed in the definition
* of get_sr_golomb_shorten(). */ |
e9e37f2d |
if (s->version == 0)
residual_size--;
} |
85ad5695 |
|
c25762fc |
/* calculate sample offset using means from previous blocks */ |
e9e37f2d |
if (s->nmean == 0)
coffset = s->offset[channel][0];
else {
int32_t sum = (s->version < 2) ? 0 : s->nmean / 2; |
a2ad554d |
for (i = 0; i < s->nmean; i++) |
e9e37f2d |
sum += s->offset[channel][i];
coffset = sum / s->nmean;
if (s->version >= 2) |
672f8226 |
coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1; |
e9e37f2d |
} |
85ad5695 |
|
c25762fc |
/* decode samples for this channel */ |
15d146c9 |
if (cmd == FN_ZERO) { |
a2ad554d |
for (i = 0; i < s->blocksize; i++) |
15d146c9 |
s->decoded[channel][i] = 0;
} else { |
a2ad554d |
if ((ret = decode_subframe_lpc(s, cmd, channel,
residual_size, coffset)) < 0) |
15d146c9 |
return ret; |
e9e37f2d |
} |
85ad5695 |
|
c25762fc |
/* update means with info from the current block */ |
e9e37f2d |
if (s->nmean > 0) {
int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2; |
a2ad554d |
for (i = 0; i < s->blocksize; i++) |
e9e37f2d |
sum += s->decoded[channel][i]; |
85ad5695 |
|
a2ad554d |
for (i = 1; i < s->nmean; i++)
s->offset[channel][i - 1] = s->offset[channel][i]; |
85ad5695 |
|
e9e37f2d |
if (s->version < 2)
s->offset[channel][s->nmean - 1] = sum / s->blocksize;
else
s->offset[channel][s->nmean - 1] = (sum / s->blocksize) << s->bitshift;
} |
85ad5695 |
|
c25762fc |
/* copy wrap samples for use with next block */ |
a2ad554d |
for (i = -s->nwrap; i < 0; i++) |
e9e37f2d |
s->decoded[channel][i] = s->decoded[channel][i + s->blocksize]; |
85ad5695 |
|
c25762fc |
/* shift samples to add in unused zero bits which were removed |
a2ad554d |
* during encoding */ |
e9e37f2d |
fix_bitshift(s, s->decoded[channel]); |
85ad5695 |
|
c25762fc |
/* if this is the last channel in the block, output the samples */ |
e9e37f2d |
s->cur_chan++;
if (s->cur_chan == s->channels) { |
b7159877 |
uint8_t *samples_u8;
int16_t *samples_s16;
int chan;
|
0eea2129 |
/* get output buffer */ |
fed74c0a |
frame->nb_samples = s->blocksize; |
1ec94b0f |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
0eea2129 |
return ret; |
ae237a11 |
for (chan = 0; chan < s->channels; chan++) { |
2becf21d |
samples_u8 = ((uint8_t **)frame->extended_data)[chan];
samples_s16 = ((int16_t **)frame->extended_data)[chan]; |
ae237a11 |
for (i = 0; i < s->blocksize; i++) { |
b7159877 |
switch (s->internal_ftype) {
case TYPE_U8:
*samples_u8++ = av_clip_uint8(s->decoded[chan][i]);
break;
case TYPE_S16HL:
case TYPE_S16LH:
*samples_s16++ = av_clip_int16(s->decoded[chan][i]);
break;
}
}
} |
0eea2129 |
|
fed74c0a |
*got_frame_ptr = 1; |
b399cbfb |
} |
85ad5695 |
}
} |
1baa25c7 |
if (s->cur_chan < s->channels) |
0eea2129 |
*got_frame_ptr = 0; |
85ad5695 |
|
1baa25c7 |
finish_frame: |
a2ad554d |
s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8);
i = get_bits_count(&s->gb) / 8; |
85ad5695 |
if (i > buf_size) {
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size); |
a2ad554d |
s->bitstream_size = 0;
s->bitstream_index = 0; |
6b11ae71 |
return AVERROR_INVALIDDATA; |
85ad5695 |
}
if (s->bitstream_size) {
s->bitstream_index += i;
s->bitstream_size -= i;
return input_buf_size;
} else
return i;
}
|
98a6fff9 |
static av_cold int shorten_decode_close(AVCodecContext *avctx) |
85ad5695 |
{
ShortenContext *s = avctx->priv_data;
int i;
for (i = 0; i < s->channels; i++) { |
18bcfc91 |
s->decoded[i] = NULL;
av_freep(&s->decoded_base[i]); |
85ad5695 |
av_freep(&s->offset[i]);
}
av_freep(&s->bitstream); |
02591641 |
av_freep(&s->coeffs); |
0eea2129 |
|
85ad5695 |
return 0;
}
|
e7e2df27 |
AVCodec ff_shorten_decoder = { |
ec6402b7 |
.name = "shorten", |
b2bed932 |
.long_name = NULL_IF_CONFIG_SMALL("Shorten"), |
ec6402b7 |
.type = AVMEDIA_TYPE_AUDIO, |
36ef5369 |
.id = AV_CODEC_ID_SHORTEN, |
ec6402b7 |
.priv_data_size = sizeof(ShortenContext),
.init = shorten_decode_init,
.close = shorten_decode_close,
.decode = shorten_decode_frame, |
0eea2129 |
.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
977eb7d5 |
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
694dc625 |
AV_SAMPLE_FMT_U8P, |
977eb7d5 |
AV_SAMPLE_FMT_NONE }, |
85ad5695 |
}; |