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FFmpeg/libavcodec/shorten.c
Andreas Rheinhardt 21b23ceab3 avcodec: Make init-threadsafety the default 
and remove FF_CODEC_CAP_INIT_THREADSAFE
All our native codecs are already init-threadsafe
(only wrappers for external libraries and hwaccels
are typically not marked as init-threadsafe yet),
so it is only natural for this to also be the default state.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-07-18 20:04:59 +02:00

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/*
* Shorten decoder
* Copyright (c) 2005 Jeff Muizelaar
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* 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
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Shorten decoder
* @author Jeff Muizelaar
*/
#include <limits.h>
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "golomb.h"
#include "internal.h"
#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
#define TYPE_S8 1
#define TYPE_U8 2
#define TYPE_S16HL 3
#define TYPE_U16HL 4
#define TYPE_S16LH 5
#define TYPE_U16LH 6
#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
/** 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 };
#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;
unsigned channels;
int32_t *decoded[MAX_CHANNELS];
int32_t *decoded_base[MAX_CHANNELS];
int32_t *offset[MAX_CHANNELS];
int *coeffs;
uint8_t *bitstream;
int bitstream_size;
int bitstream_index;
unsigned int allocated_bitstream_size;
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;
int got_header;
int got_quit_command;
int swap;
BswapDSPContext bdsp;
} ShortenContext;
static av_cold int shorten_decode_init(AVCodecContext *avctx)
{
ShortenContext *s = avctx->priv_data;
s->avctx = avctx;
ff_bswapdsp_init(&s->bdsp);
return 0;
}
static int allocate_buffers(ShortenContext *s)
{
int i, chan, err;
for (chan = 0; chan < s->channels; chan++) {
if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) {
av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n");
return AVERROR_INVALIDDATA;
}
if (s->blocksize + (uint64_t)s->nwrap >= UINT_MAX / sizeof(int32_t)) {
av_log(s->avctx, AV_LOG_ERROR,
"s->blocksize + s->nwrap too large\n");
return AVERROR_INVALIDDATA;
}
if ((err = av_reallocp_array(&s->offset[chan],
sizeof(int32_t),
FFMAX(1, s->nmean))) < 0)
return err;
if ((err = av_reallocp_array(&s->decoded_base[chan], (s->blocksize + s->nwrap),
sizeof(s->decoded_base[0][0]))) < 0)
return err;
for (i = 0; i < s->nwrap; i++)
s->decoded_base[chan][i] = 0;
s->decoded[chan] = s->decoded_base[chan] + s->nwrap;
}
if ((err = av_reallocp_array(&s->coeffs, s->nwrap, sizeof(*s->coeffs))) < 0)
return err;
return 0;
}
static inline unsigned int get_uint(ShortenContext *s, int k)
{
if (s->version != 0) {
k = get_ur_golomb_shorten(&s->gb, ULONGSIZE);
if (k > 31U)
return AVERROR_INVALIDDATA;
}
return get_ur_golomb_shorten(&s->gb, k);
}
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
{
int i;
if (s->bitshift == 32) {
for (i = 0; i < s->blocksize; i++)
buffer[i] = 0;
} else if (s->bitshift != 0) {
for (i = 0; i < s->blocksize; i++)
buffer[i] *= 1U << s->bitshift;
}
}
static int init_offset(ShortenContext *s)
{
int32_t mean = 0;
int chan, i;
int nblock = FFMAX(1, s->nmean);
/* initialise offset */
switch (s->internal_ftype) {
case TYPE_U8:
s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
mean = 0x80;
break;
case TYPE_S16HL:
case TYPE_S16LH:
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
return AVERROR_PATCHWELCOME;
}
for (chan = 0; chan < s->channels; chan++)
for (i = 0; i < nblock; i++)
s->offset[chan][i] = mean;
return 0;
}
static int decode_aiff_header(AVCodecContext *avctx, const uint8_t *header,
int header_size)
{
ShortenContext *s = avctx->priv_data;
int len, bps, exp;
GetByteContext gb;
uint64_t val;
uint32_t tag;
bytestream2_init(&gb, header, header_size);
if (bytestream2_get_le32(&gb) != MKTAG('F', 'O', 'R', 'M')) {
av_log(avctx, AV_LOG_ERROR, "missing FORM tag\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gb, 4); /* chunk size */
tag = bytestream2_get_le32(&gb);
if (tag != MKTAG('A', 'I', 'F', 'F') &&
tag != MKTAG('A', 'I', 'F', 'C')) {
av_log(avctx, AV_LOG_ERROR, "missing AIFF tag\n");
return AVERROR_INVALIDDATA;
}
while (bytestream2_get_le32(&gb) != MKTAG('C', 'O', 'M', 'M')) {
len = bytestream2_get_be32(&gb);
if (len < 0 || bytestream2_get_bytes_left(&gb) < 18LL + len + (len&1)) {
av_log(avctx, AV_LOG_ERROR, "no COMM chunk found\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gb, len + (len & 1));
}
len = bytestream2_get_be32(&gb);
if (len < 18) {
av_log(avctx, AV_LOG_ERROR, "COMM chunk was too short\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gb, 6);
bps = bytestream2_get_be16(&gb);
avctx->bits_per_coded_sample = bps;
s->swap = tag == MKTAG('A', 'I', 'F', 'C');
if (bps != 16 && bps != 8) {
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
return AVERROR(ENOSYS);
}
exp = bytestream2_get_be16(&gb) - 16383 - 63;
val = bytestream2_get_be64(&gb);
if (exp < -63 || exp > 63) {
av_log(avctx, AV_LOG_ERROR, "exp %d is out of range\n", exp);
return AVERROR_INVALIDDATA;
}
if (exp >= 0)
avctx->sample_rate = val << exp;
else
avctx->sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
len -= 18;
if (len > 0)
av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
return 0;
}
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
int header_size)
{
int len, bps;
short wave_format;
GetByteContext gb;
bytestream2_init(&gb, header, header_size);
if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gb, 4); /* chunk size */
if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) {
av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
return AVERROR_INVALIDDATA;
}
while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) {
len = bytestream2_get_le32(&gb);
bytestream2_skip(&gb, len);
if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) {
av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n");
return AVERROR_INVALIDDATA;
}
}
len = bytestream2_get_le32(&gb);
if (len < 16) {
av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
return AVERROR_INVALIDDATA;
}
wave_format = bytestream2_get_le16(&gb);
switch (wave_format) {
case WAVE_FORMAT_PCM:
break;
default:
av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
return AVERROR(ENOSYS);
}
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)
bps = bytestream2_get_le16(&gb);
avctx->bits_per_coded_sample = bps;
if (bps != 16 && bps != 8) {
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
return AVERROR(ENOSYS);
}
len -= 16;
if (len > 0)
av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
return 0;
}
static const int fixed_coeffs[][3] = {
{ 0, 0, 0 },
{ 1, 0, 0 },
{ 2, -1, 0 },
{ 3, -3, 1 }
};
static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
int residual_size, int32_t coffset)
{
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 ((unsigned)pred_order > s->nwrap) {
av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
pred_order);
return AVERROR(EINVAL);
}
/* read LPC coefficients */
for (i = 0; i < pred_order; i++)
s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
coeffs = s->coeffs;
qshift = LPCQUANT;
} else {
/* fixed LPC coeffs */
pred_order = command;
if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) {
av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
pred_order);
return AVERROR_INVALIDDATA;
}
coeffs = fixed_coeffs[pred_order];
qshift = 0;
}
/* subtract offset from previous samples to use in prediction */
if (command == FN_QLPC && coffset)
for (i = -pred_order; i < 0; i++)
s->decoded[channel][i] -= (unsigned)coffset;
/* decode residual and do LPC prediction */
init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset;
for (i = 0; i < s->blocksize; i++) {
sum = init_sum;
for (j = 0; j < pred_order; j++)
sum += coeffs[j] * (unsigned)s->decoded[channel][i - j - 1];
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
(unsigned)(sum >> qshift);
}
/* add offset to current samples */
if (command == FN_QLPC && coffset)
for (i = 0; i < s->blocksize; i++)
s->decoded[channel][i] += (unsigned)coffset;
return 0;
}
static int read_header(ShortenContext *s)
{
int i, ret;
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");
return AVERROR_INVALIDDATA;
}
s->lpcqoffset = 0;
s->blocksize = DEFAULT_BLOCK_SIZE;
s->nmean = -1;
s->version = get_bits(&s->gb, 8);
s->internal_ftype = get_uint(s, TYPESIZE);
s->channels = get_uint(s, CHANSIZE);
if (!s->channels) {
av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n");
return AVERROR_INVALIDDATA;
}
if (s->channels > MAX_CHANNELS) {
av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
s->channels = 0;
return AVERROR_INVALIDDATA;
}
if (s->avctx->ch_layout.nb_channels != s->channels) {
av_channel_layout_uninit(&s->avctx->ch_layout);
s->avctx->ch_layout.nb_channels = s->channels;
s->avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
}
/* get blocksize if version > 0 */
if (s->version > 0) {
int skip_bytes;
unsigned blocksize;
blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
if (!blocksize || blocksize > MAX_BLOCKSIZE) {
av_log(s->avctx, AV_LOG_ERROR,
"invalid or unsupported block size: %d\n",
blocksize);
return AVERROR(EINVAL);
}
s->blocksize = blocksize;
maxnlpc = get_uint(s, LPCQSIZE);
if (maxnlpc > 1024U) {
av_log(s->avctx, AV_LOG_ERROR, "maxnlpc is: %d\n", maxnlpc);
return AVERROR_INVALIDDATA;
}
s->nmean = get_uint(s, 0);
if (s->nmean > 32768U) {
av_log(s->avctx, AV_LOG_ERROR, "nmean is: %d\n", s->nmean);
return AVERROR_INVALIDDATA;
}
skip_bytes = get_uint(s, NSKIPSIZE);
if ((unsigned)skip_bytes > FFMAX(get_bits_left(&s->gb), 0)/8) {
av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < skip_bytes; i++)
skip_bits(&s->gb, 8);
}
s->nwrap = FFMAX(NWRAP, maxnlpc);
if (s->version > 1)
s->lpcqoffset = V2LPCQOFFSET;
if (s->avctx->extradata_size > 0)
goto end;
if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) {
av_log(s->avctx, AV_LOG_ERROR,
"missing verbatim section at beginning of stream\n");
return AVERROR_INVALIDDATA;
}
s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
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);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < s->header_size; i++)
s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
if (AV_RL32(s->header) == MKTAG('R','I','F','F')) {
if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0)
return ret;
} else if (AV_RL32(s->header) == MKTAG('F','O','R','M')) {
if ((ret = decode_aiff_header(s->avctx, s->header, s->header_size)) < 0)
return ret;
} else {
avpriv_report_missing_feature(s->avctx, "unsupported bit packing %"
PRIX32, AV_RL32(s->header));
return AVERROR_PATCHWELCOME;
}
end:
if ((ret = allocate_buffers(s)) < 0)
return ret;
if ((ret = init_offset(s)) < 0)
return ret;
s->cur_chan = 0;
s->bitshift = 0;
s->got_header = 1;
return 0;
}
static int shorten_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
ShortenContext *s = avctx->priv_data;
int i, input_buf_size = 0;
int ret;
/* allocate internal bitstream buffer */
if (s->max_framesize == 0) {
void *tmp_ptr;
s->max_framesize = 8192; // should hopefully be enough for the first header
tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size,
s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE);
if (!tmp_ptr) {
s->max_framesize = 0;
av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
return AVERROR(ENOMEM);
}
memset(tmp_ptr, 0, s->allocated_bitstream_size);
s->bitstream = tmp_ptr;
}
/* append current packet data to bitstream buffer */
buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size);
input_buf_size = buf_size;
if (s->bitstream_index + s->bitstream_size + buf_size + AV_INPUT_BUFFER_PADDING_SIZE >
s->allocated_bitstream_size) {
memmove(s->bitstream, &s->bitstream[s->bitstream_index],
s->bitstream_size);
s->bitstream_index = 0;
}
if (buf)
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;
/* do not decode until buffer has at least max_framesize bytes or
* the end of the file has been reached */
if (buf_size < s->max_framesize && avpkt->data) {
*got_frame_ptr = 0;
return input_buf_size;
}
/* init and position bitstream reader */
if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
return ret;
skip_bits(&s->gb, s->bitindex);
/* process header or next subblock */
if (!s->got_header) {
if ((ret = read_header(s)) < 0)
return ret;
if (avpkt->size) {
int max_framesize;
void *tmp_ptr;
max_framesize = FFMAX(s->max_framesize, s->blocksize * s->channels * 8);
tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size,
max_framesize + AV_INPUT_BUFFER_PADDING_SIZE);
if (!tmp_ptr) {
av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
return AVERROR(ENOMEM);
}
s->bitstream = tmp_ptr;
s->max_framesize = max_framesize;
*got_frame_ptr = 0;
goto finish_frame;
}
}
/* if quit command was read previously, don't decode anything */
if (s->got_quit_command) {
*got_frame_ptr = 0;
return avpkt->size;
}
s->cur_chan = 0;
while (s->cur_chan < s->channels) {
unsigned cmd;
int len;
if (get_bits_left(&s->gb) < 3 + FNSIZE) {
*got_frame_ptr = 0;
break;
}
cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
if (cmd > FN_VERBATIM) {
av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
*got_frame_ptr = 0;
break;
}
if (!is_audio_command[cmd]) {
/* process non-audio command */
switch (cmd) {
case FN_VERBATIM:
len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
if (len < 0 || len > get_bits_left(&s->gb)) {
av_log(avctx, AV_LOG_ERROR, "verbatim length %d invalid\n",
len);
return AVERROR_INVALIDDATA;
}
while (len--)
get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
break;
case FN_BITSHIFT: {
unsigned bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
if (bitshift > 32) {
av_log(avctx, AV_LOG_ERROR, "bitshift %d is invalid\n",
bitshift);
return AVERROR_INVALIDDATA;
}
s->bitshift = bitshift;
break;
}
case FN_BLOCKSIZE: {
unsigned blocksize = get_uint(s, av_log2(s->blocksize));
if (blocksize > s->blocksize) {
avpriv_report_missing_feature(avctx,
"Increasing block size");
return AVERROR_PATCHWELCOME;
}
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;
}
if (cmd == FN_QUIT)
break;
} else {
/* process audio command */
int residual_size = 0;
int channel = s->cur_chan;
int32_t coffset;
/* get Rice code for residual decoding */
if (cmd != FN_ZERO) {
residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE);
/* This is a hack as version 0 differed in the definition
* of get_sr_golomb_shorten(). */
if (s->version == 0)
residual_size--;
if (residual_size > 30U) {
av_log(avctx, AV_LOG_ERROR, "residual size unsupportd: %d\n", residual_size);
return AVERROR_INVALIDDATA;
}
}
/* calculate sample offset using means from previous blocks */
if (s->nmean == 0)
coffset = s->offset[channel][0];
else {
int32_t sum = (s->version < 2) ? 0 : s->nmean / 2;
for (i = 0; i < s->nmean; i++)
sum += (unsigned)s->offset[channel][i];
coffset = sum / s->nmean;
if (s->version >= 2)
coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1;
}
/* decode samples for this channel */
if (cmd == FN_ZERO) {
for (i = 0; i < s->blocksize; i++)
s->decoded[channel][i] = 0;
} else {
if ((ret = decode_subframe_lpc(s, cmd, channel,
residual_size, coffset)) < 0)
return ret;
}
/* update means with info from the current block */
if (s->nmean > 0) {
int64_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
for (i = 0; i < s->blocksize; i++)
sum += s->decoded[channel][i];
for (i = 1; i < s->nmean; i++)
s->offset[channel][i - 1] = s->offset[channel][i];
if (s->version < 2)
s->offset[channel][s->nmean - 1] = sum / s->blocksize;
else
s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) * (1LL << s->bitshift);
}
/* copy wrap samples for use with next block */
for (i = -s->nwrap; i < 0; i++)
s->decoded[channel][i] = s->decoded[channel][i + s->blocksize];
/* shift samples to add in unused zero bits which were removed
* during encoding */
fix_bitshift(s, s->decoded[channel]);
/* if this is the last channel in the block, output the samples */
s->cur_chan++;
if (s->cur_chan == s->channels) {
uint8_t *samples_u8;
int16_t *samples_s16;
int chan;
/* get output buffer */
frame->nb_samples = s->blocksize;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
for (chan = 0; chan < s->channels; chan++) {
samples_u8 = ((uint8_t **)frame->extended_data)[chan];
samples_s16 = ((int16_t **)frame->extended_data)[chan];
for (i = 0; i < s->blocksize; i++) {
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;
}
}
if (s->swap && s->internal_ftype != TYPE_U8)
s->bdsp.bswap16_buf(((uint16_t **)frame->extended_data)[chan],
((uint16_t **)frame->extended_data)[chan],
s->blocksize);
}
*got_frame_ptr = 1;
}
}
}
if (s->cur_chan < s->channels)
*got_frame_ptr = 0;
finish_frame:
s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8);
i = get_bits_count(&s->gb) / 8;
if (i > buf_size) {
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
s->bitstream_size = 0;
s->bitstream_index = 0;
return AVERROR_INVALIDDATA;
}
if (s->bitstream_size) {
s->bitstream_index += i;
s->bitstream_size -= i;
return input_buf_size;
} else
return i;
}
static av_cold int shorten_decode_close(AVCodecContext *avctx)
{
ShortenContext *s = avctx->priv_data;
int i;
for (i = 0; i < s->channels; i++) {
s->decoded[i] = NULL;
av_freep(&s->decoded_base[i]);
av_freep(&s->offset[i]);
}
av_freep(&s->bitstream);
av_freep(&s->coeffs);
return 0;
}
const FFCodec ff_shorten_decoder = {
.p.name = "shorten",
.p.long_name = NULL_IF_CONFIG_SMALL("Shorten"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_SHORTEN,
.priv_data_size = sizeof(ShortenContext),
.init = shorten_decode_init,
.close = shorten_decode_close,
FF_CODEC_DECODE_CB(shorten_decode_frame),
.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_SUBFRAMES ,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_NONE },
};
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