816 lines
26 KiB
C
816 lines
26 KiB
C
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/*
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* Shorten decoder
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* Copyright (c) 2005 Jeff Muizelaar
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* 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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Shorten decoder
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* @author Jeff Muizelaar
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*/
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#include <limits.h>
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#include "avcodec.h"
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#include "bswapdsp.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "internal.h"
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#define MAX_CHANNELS 8
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#define MAX_BLOCKSIZE 65535
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#define OUT_BUFFER_SIZE 16384
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#define ULONGSIZE 2
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#define WAVE_FORMAT_PCM 0x0001
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#define DEFAULT_BLOCK_SIZE 256
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#define TYPESIZE 4
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#define CHANSIZE 0
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#define LPCQSIZE 2
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#define ENERGYSIZE 3
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#define BITSHIFTSIZE 2
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#define TYPE_S8 1
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#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
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#define NSKIPSIZE 1
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#define LPCQUANT 5
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#define V2LPCQOFFSET (1 << LPCQUANT)
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#define FNSIZE 2
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#define FN_DIFF0 0
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#define FN_DIFF1 1
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#define FN_DIFF2 2
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#define FN_DIFF3 3
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#define FN_QUIT 4
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#define FN_BLOCKSIZE 5
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#define FN_BITSHIFT 6
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#define FN_QLPC 7
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#define FN_ZERO 8
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#define FN_VERBATIM 9
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/** indicates if the FN_* command is audio or non-audio */
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static const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 };
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#define VERBATIM_CKSIZE_SIZE 5
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#define VERBATIM_BYTE_SIZE 8
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#define CANONICAL_HEADER_SIZE 44
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typedef struct ShortenContext {
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AVCodecContext *avctx;
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GetBitContext gb;
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int min_framesize, max_framesize;
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unsigned channels;
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int32_t *decoded[MAX_CHANNELS];
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int32_t *decoded_base[MAX_CHANNELS];
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int32_t *offset[MAX_CHANNELS];
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int *coeffs;
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uint8_t *bitstream;
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int bitstream_size;
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int bitstream_index;
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unsigned int allocated_bitstream_size;
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int header_size;
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uint8_t header[OUT_BUFFER_SIZE];
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int version;
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int cur_chan;
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int bitshift;
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int nmean;
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int internal_ftype;
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int nwrap;
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int blocksize;
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int bitindex;
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int32_t lpcqoffset;
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int got_header;
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int got_quit_command;
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int swap;
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BswapDSPContext bdsp;
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} ShortenContext;
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static av_cold int shorten_decode_init(AVCodecContext *avctx)
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{
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ShortenContext *s = avctx->priv_data;
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s->avctx = avctx;
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ff_bswapdsp_init(&s->bdsp);
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return 0;
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}
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static int allocate_buffers(ShortenContext *s)
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{
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int i, chan, err;
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for (chan = 0; chan < s->channels; chan++) {
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if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) {
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av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n");
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return AVERROR_INVALIDDATA;
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}
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if (s->blocksize + (uint64_t)s->nwrap >= UINT_MAX / sizeof(int32_t)) {
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av_log(s->avctx, AV_LOG_ERROR,
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"s->blocksize + s->nwrap too large\n");
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return AVERROR_INVALIDDATA;
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}
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if ((err = av_reallocp_array(&s->offset[chan],
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sizeof(int32_t),
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FFMAX(1, s->nmean))) < 0)
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return err;
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if ((err = av_reallocp_array(&s->decoded_base[chan], (s->blocksize + s->nwrap),
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sizeof(s->decoded_base[0][0]))) < 0)
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return err;
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for (i = 0; i < s->nwrap; i++)
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s->decoded_base[chan][i] = 0;
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s->decoded[chan] = s->decoded_base[chan] + s->nwrap;
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}
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if ((err = av_reallocp_array(&s->coeffs, s->nwrap, sizeof(*s->coeffs))) < 0)
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return err;
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return 0;
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}
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static inline unsigned int get_uint(ShortenContext *s, int k)
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{
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if (s->version != 0) {
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k = get_ur_golomb_shorten(&s->gb, ULONGSIZE);
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if (k > 31U)
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return AVERROR_INVALIDDATA;
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}
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return get_ur_golomb_shorten(&s->gb, k);
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}
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static void fix_bitshift(ShortenContext *s, int32_t *buffer)
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{
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int i;
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if (s->bitshift == 32) {
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for (i = 0; i < s->blocksize; i++)
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buffer[i] = 0;
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} else if (s->bitshift != 0) {
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for (i = 0; i < s->blocksize; i++)
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buffer[i] *= 1U << s->bitshift;
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}
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}
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static int init_offset(ShortenContext *s)
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{
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int32_t mean = 0;
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int chan, i;
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int nblock = FFMAX(1, s->nmean);
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/* initialise offset */
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switch (s->internal_ftype) {
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case TYPE_U8:
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s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
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mean = 0x80;
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break;
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case TYPE_S16HL:
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case TYPE_S16LH:
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s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
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break;
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default:
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av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
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return AVERROR_PATCHWELCOME;
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}
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for (chan = 0; chan < s->channels; chan++)
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for (i = 0; i < nblock; i++)
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s->offset[chan][i] = mean;
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return 0;
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}
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static int decode_aiff_header(AVCodecContext *avctx, const uint8_t *header,
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int header_size)
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{
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ShortenContext *s = avctx->priv_data;
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int len, bps, exp;
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GetByteContext gb;
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uint64_t val;
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uint32_t tag;
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bytestream2_init(&gb, header, header_size);
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if (bytestream2_get_le32(&gb) != MKTAG('F', 'O', 'R', 'M')) {
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av_log(avctx, AV_LOG_ERROR, "missing FORM tag\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skip(&gb, 4); /* chunk size */
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tag = bytestream2_get_le32(&gb);
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if (tag != MKTAG('A', 'I', 'F', 'F') &&
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tag != MKTAG('A', 'I', 'F', 'C')) {
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av_log(avctx, AV_LOG_ERROR, "missing AIFF tag\n");
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return AVERROR_INVALIDDATA;
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}
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while (bytestream2_get_le32(&gb) != MKTAG('C', 'O', 'M', 'M')) {
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len = bytestream2_get_be32(&gb);
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if (len < 0 || bytestream2_get_bytes_left(&gb) < 18LL + len + (len&1)) {
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av_log(avctx, AV_LOG_ERROR, "no COMM chunk found\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skip(&gb, len + (len & 1));
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}
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len = bytestream2_get_be32(&gb);
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if (len < 18) {
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av_log(avctx, AV_LOG_ERROR, "COMM chunk was too short\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skip(&gb, 6);
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bps = bytestream2_get_be16(&gb);
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avctx->bits_per_coded_sample = bps;
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s->swap = tag == MKTAG('A', 'I', 'F', 'C');
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if (bps != 16 && bps != 8) {
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av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
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return AVERROR(ENOSYS);
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}
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exp = bytestream2_get_be16(&gb) - 16383 - 63;
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val = bytestream2_get_be64(&gb);
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if (exp < -63 || exp > 63) {
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av_log(avctx, AV_LOG_ERROR, "exp %d is out of range\n", exp);
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return AVERROR_INVALIDDATA;
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}
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if (exp >= 0)
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avctx->sample_rate = val << exp;
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else
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avctx->sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
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len -= 18;
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if (len > 0)
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av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
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return 0;
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}
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static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
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int header_size)
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{
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int len, bps;
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short wave_format;
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GetByteContext gb;
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bytestream2_init(&gb, header, header_size);
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if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
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av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skip(&gb, 4); /* chunk size */
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if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) {
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av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
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return AVERROR_INVALIDDATA;
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}
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while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) {
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len = bytestream2_get_le32(&gb);
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bytestream2_skip(&gb, len);
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if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) {
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av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n");
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return AVERROR_INVALIDDATA;
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}
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}
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len = bytestream2_get_le32(&gb);
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if (len < 16) {
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av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
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return AVERROR_INVALIDDATA;
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}
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wave_format = bytestream2_get_le16(&gb);
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switch (wave_format) {
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case WAVE_FORMAT_PCM:
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
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return AVERROR(ENOSYS);
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}
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bytestream2_skip(&gb, 2); // skip channels (already got from shorten header)
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avctx->sample_rate = bytestream2_get_le32(&gb);
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bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate)
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bytestream2_skip(&gb, 2); // skip block align (not needed)
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bps = bytestream2_get_le16(&gb);
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avctx->bits_per_coded_sample = bps;
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if (bps != 16 && bps != 8) {
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av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
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return AVERROR(ENOSYS);
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}
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len -= 16;
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if (len > 0)
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av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
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return 0;
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}
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static const int fixed_coeffs[][3] = {
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{ 0, 0, 0 },
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{ 1, 0, 0 },
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{ 2, -1, 0 },
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{ 3, -3, 1 }
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};
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static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
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int residual_size, int32_t coffset)
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{
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int pred_order, sum, qshift, init_sum, i, j;
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const int *coeffs;
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if (command == FN_QLPC) {
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/* read/validate prediction order */
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pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
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if ((unsigned)pred_order > s->nwrap) {
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av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
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pred_order);
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return AVERROR(EINVAL);
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}
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/* read LPC coefficients */
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for (i = 0; i < pred_order; i++)
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s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
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coeffs = s->coeffs;
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|
|
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;
|
||
|
|
}
|
||
|
|
s->avctx->channels = s->channels;
|
||
|
|
|
||
|
|
/* 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, void *data,
|
||
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
AVFrame *frame = data;
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_shorten_decoder = {
|
||
|
|
.name = "shorten",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Shorten"),
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
.id = AV_CODEC_ID_SHORTEN,
|
||
|
|
.priv_data_size = sizeof(ShortenContext),
|
||
|
|
.init = shorten_decode_init,
|
||
|
|
.close = shorten_decode_close,
|
||
|
|
.decode = shorten_decode_frame,
|
||
|
|
.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
|
||
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
|
||
|
|
AV_SAMPLE_FMT_U8P,
|
||
|
|
AV_SAMPLE_FMT_NONE },
|
||
|
|
};
|