FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/atrac1.c	Lines:	125	140	89.3 %
Date:	2021-04-18 10:33:33	Branches:	54	70	77.1 %


/*
 * ATRAC1 compatible decoder
 * Copyright (c) 2009 Maxim Poliakovski
 * Copyright (c) 2009 Benjamin Larsson
 *
 * 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
 * ATRAC1 compatible decoder.
 * This decoder handles raw ATRAC1 data and probably SDDS data.
 */

/* Many thanks to Tim Craig for all the help! */

#include <math.h>
#include <stddef.h>
#include <stdio.h>

#include "libavutil/float_dsp.h"
#include "libavutil/mem_internal.h"

#include "avcodec.h"
#include "get_bits.h"
#include "fft.h"
#include "internal.h"
#include "sinewin.h"

#include "atrac.h"
#include "atrac1data.h"

#define AT1_MAX_BFU      52                 ///< max number of block floating units in a sound unit
#define AT1_SU_SIZE      212                ///< number of bytes in a sound unit
#define AT1_SU_SAMPLES   512                ///< number of samples in a sound unit
#define AT1_FRAME_SIZE   AT1_SU_SIZE * 2
#define AT1_SU_MAX_BITS  AT1_SU_SIZE * 8
#define AT1_MAX_CHANNELS 2

#define AT1_QMF_BANDS    3
#define IDX_LOW_BAND     0
#define IDX_MID_BAND     1
#define IDX_HIGH_BAND    2

/**
 * Sound unit struct, one unit is used per channel
 */
typedef struct AT1SUCtx {
    int                 log2_block_count[AT1_QMF_BANDS];    ///< log2 number of blocks in a band
    int                 num_bfus;                           ///< number of Block Floating Units
    float*              spectrum[2];
    DECLARE_ALIGNED(32, float, spec1)[AT1_SU_SAMPLES];     ///< mdct buffer
    DECLARE_ALIGNED(32, float, spec2)[AT1_SU_SAMPLES];     ///< mdct buffer
    DECLARE_ALIGNED(32, float, fst_qmf_delay)[46];         ///< delay line for the 1st stacked QMF filter
    DECLARE_ALIGNED(32, float, snd_qmf_delay)[46];         ///< delay line for the 2nd stacked QMF filter
    DECLARE_ALIGNED(32, float, last_qmf_delay)[256+39];    ///< delay line for the last stacked QMF filter
} AT1SUCtx;

/**
 * The atrac1 context, holds all needed parameters for decoding
 */
typedef struct AT1Ctx {
    AT1SUCtx            SUs[AT1_MAX_CHANNELS];              ///< channel sound unit
    DECLARE_ALIGNED(32, float, spec)[AT1_SU_SAMPLES];      ///< the mdct spectrum buffer

    DECLARE_ALIGNED(32, float,  low)[256];
    DECLARE_ALIGNED(32, float,  mid)[256];
    DECLARE_ALIGNED(32, float, high)[512];
    float*              bands[3];
    FFTContext          mdct_ctx[3];
    void (*vector_fmul_window)(float *dst, const float *src0,
                               const float *src1, const float *win, int len);
} AT1Ctx;

/** size of the transform in samples in the long mode for each QMF band */
static const uint16_t samples_per_band[3] = {128, 128, 256};
static const uint8_t   mdct_long_nbits[3] = {7, 7, 8};


static void at1_imdct(AT1Ctx *q, float *spec, float *out, int nbits,
                      int rev_spec)
{
    FFTContext* mdct_context = &q->mdct_ctx[nbits - 5 - (nbits > 6)];
    int transf_size = 1 << nbits;

    if (rev_spec) {
        int i;
        for (i = 0; i < transf_size / 2; i++)
            FFSWAP(float, spec[i], spec[transf_size - 1 - i]);
    }
    mdct_context->imdct_half(mdct_context, out, spec);
}


static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q)
{
    int          band_num, band_samples, log2_block_count, nbits, num_blocks, block_size;
    unsigned int start_pos, ref_pos = 0, pos = 0;

    for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
        float *prev_buf;
        int j;

        band_samples = samples_per_band[band_num];
        log2_block_count = su->log2_block_count[band_num];

        /* number of mdct blocks in the current QMF band: 1 - for long mode */
        /* 4 for short mode(low/middle bands) and 8 for short mode(high band)*/
        num_blocks = 1 << log2_block_count;

        if (num_blocks == 1) {
            /* mdct block size in samples: 128 (long mode, low & mid bands), */
            /* 256 (long mode, high band) and 32 (short mode, all bands) */
            block_size = band_samples >> log2_block_count;

            /* calc transform size in bits according to the block_size_mode */
            nbits = mdct_long_nbits[band_num] - log2_block_count;

            if (nbits != 5 && nbits != 7 && nbits != 8)
                return AVERROR_INVALIDDATA;
        } else {
            block_size = 32;
            nbits = 5;
        }

        start_pos = 0;
        prev_buf = &su->spectrum[1][ref_pos + band_samples - 16];
        for (j=0; j < num_blocks; j++) {
            at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], nbits, band_num);

            /* overlap and window */
            q->vector_fmul_window(&q->bands[band_num][start_pos], prev_buf,
                                  &su->spectrum[0][ref_pos + start_pos], ff_sine_32, 16);

            prev_buf = &su->spectrum[0][ref_pos+start_pos + 16];
            start_pos += block_size;
            pos += block_size;
        }

        if (num_blocks == 1)
            memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float));

        ref_pos += band_samples;
    }

    /* Swap buffers so the mdct overlap works */
    FFSWAP(float*, su->spectrum[0], su->spectrum[1]);

    return 0;
}

/**
 * Parse the block size mode byte
 */

static int at1_parse_bsm(GetBitContext* gb, int log2_block_cnt[AT1_QMF_BANDS])
{
    int log2_block_count_tmp, i;

    for (i = 0; i < 2; i++) {
        /* low and mid band */
        log2_block_count_tmp = get_bits(gb, 2);
        if (log2_block_count_tmp & 1)
            return AVERROR_INVALIDDATA;
        log2_block_cnt[i] = 2 - log2_block_count_tmp;
    }

    /* high band */
    log2_block_count_tmp = get_bits(gb, 2);
    if (log2_block_count_tmp != 0 && log2_block_count_tmp != 3)
        return AVERROR_INVALIDDATA;
    log2_block_cnt[IDX_HIGH_BAND] = 3 - log2_block_count_tmp;

    skip_bits(gb, 2);
    return 0;
}


static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
                              float spec[AT1_SU_SAMPLES])
{
    int bits_used, band_num, bfu_num, i;
    uint8_t idwls[AT1_MAX_BFU];                 ///< the word length indexes for each BFU
    uint8_t idsfs[AT1_MAX_BFU];                 ///< the scalefactor indexes for each BFU

    /* parse the info byte (2nd byte) telling how much BFUs were coded */
    su->num_bfus = bfu_amount_tab1[get_bits(gb, 3)];

    /* calc number of consumed bits:
        num_BFUs * (idwl(4bits) + idsf(6bits)) + log2_block_count(8bits) + info_byte(8bits)
        + info_byte_copy(8bits) + log2_block_count_copy(8bits) */
    bits_used = su->num_bfus * 10 + 32 +
                bfu_amount_tab2[get_bits(gb, 2)] +
                (bfu_amount_tab3[get_bits(gb, 3)] << 1);

    /* get word length index (idwl) for each BFU */
    for (i = 0; i < su->num_bfus; i++)
        idwls[i] = get_bits(gb, 4);

    /* get scalefactor index (idsf) for each BFU */
    for (i = 0; i < su->num_bfus; i++)
        idsfs[i] = get_bits(gb, 6);

    /* zero idwl/idsf for empty BFUs */
    for (i = su->num_bfus; i < AT1_MAX_BFU; i++)
        idwls[i] = idsfs[i] = 0;

    /* read in the spectral data and reconstruct MDCT spectrum of this channel */
    for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
        for (bfu_num = bfu_bands_t[band_num]; bfu_num < bfu_bands_t[band_num+1]; bfu_num++) {
            int pos;

            int num_specs = specs_per_bfu[bfu_num];
            int word_len  = !!idwls[bfu_num] + idwls[bfu_num];
            float scale_factor = ff_atrac_sf_table[idsfs[bfu_num]];
            bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */

            /* check for bitstream overflow */
            if (bits_used > AT1_SU_MAX_BITS)
                return AVERROR_INVALIDDATA;

            /* get the position of the 1st spec according to the block size mode */
            pos = su->log2_block_count[band_num] ? bfu_start_short[bfu_num] : bfu_start_long[bfu_num];

            if (word_len) {
                float   max_quant = 1.0 / (float)((1 << (word_len - 1)) - 1);

                for (i = 0; i < num_specs; i++) {
                    /* read in a quantized spec and convert it to
                     * signed int and then inverse quantization
                     */
                    spec[pos+i] = get_sbits(gb, word_len) * scale_factor * max_quant;
                }
            } else { /* word_len = 0 -> empty BFU, zero all specs in the empty BFU */
                memset(&spec[pos], 0, num_specs * sizeof(float));
            }
        }
    }

    return 0;
}


static void at1_subband_synthesis(AT1Ctx *q, AT1SUCtx* su, float *pOut)
{
    float temp[256];
    float iqmf_temp[512 + 46];

    /* combine low and middle bands */
    ff_atrac_iqmf(q->bands[0], q->bands[1], 128, temp, su->fst_qmf_delay, iqmf_temp);

    /* delay the signal of the high band by 39 samples */
    memcpy( su->last_qmf_delay,    &su->last_qmf_delay[256], sizeof(float) *  39);
    memcpy(&su->last_qmf_delay[39], q->bands[2],             sizeof(float) * 256);

    /* combine (low + middle) and high bands */
    ff_atrac_iqmf(temp, su->last_qmf_delay, 256, pOut, su->snd_qmf_delay, iqmf_temp);
}


static int atrac1_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;
    AT1Ctx *q          = avctx->priv_data;
    int ch, ret;
    GetBitContext gb;


    if (buf_size < 212 * avctx->channels) {
        av_log(avctx, AV_LOG_ERROR, "Not enough data to decode!\n");
        return AVERROR_INVALIDDATA;
    }

    /* get output buffer */
    frame->nb_samples = AT1_SU_SAMPLES;
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

    for (ch = 0; ch < avctx->channels; ch++) {
        AT1SUCtx* su = &q->SUs[ch];

        init_get_bits(&gb, &buf[212 * ch], 212 * 8);

        /* parse block_size_mode, 1st byte */
        ret = at1_parse_bsm(&gb, su->log2_block_count);
        if (ret < 0)
            return ret;

        ret = at1_unpack_dequant(&gb, su, q->spec);
        if (ret < 0)
            return ret;

        ret = at1_imdct_block(su, q);
        if (ret < 0)
            return ret;
        at1_subband_synthesis(q, su, (float *)frame->extended_data[ch]);
    }

    *got_frame_ptr = 1;

    return avctx->block_align;
}


static av_cold int atrac1_decode_end(AVCodecContext * avctx)
{
    AT1Ctx *q = avctx->priv_data;

    ff_mdct_end(&q->mdct_ctx[0]);
    ff_mdct_end(&q->mdct_ctx[1]);
    ff_mdct_end(&q->mdct_ctx[2]);

    return 0;
}


static av_cold int atrac1_decode_init(AVCodecContext *avctx)
{
    AT1Ctx *q = avctx->priv_data;
    AVFloatDSPContext *fdsp;
    int ret;

    avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

    if (avctx->channels < 1 || avctx->channels > AT1_MAX_CHANNELS) {
        av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n",
               avctx->channels);
        return AVERROR(EINVAL);
    }

    if (avctx->block_align <= 0) {
        av_log(avctx, AV_LOG_ERROR, "Unsupported block align.");
        return AVERROR_PATCHWELCOME;
    }

    /* Init the mdct transforms */
    if ((ret = ff_mdct_init(&q->mdct_ctx[0], 6, 1, -1.0/ (1 << 15))) ||
        (ret = ff_mdct_init(&q->mdct_ctx[1], 8, 1, -1.0/ (1 << 15))) ||
        (ret = ff_mdct_init(&q->mdct_ctx[2], 9, 1, -1.0/ (1 << 15)))) {
        av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
        return ret;
    }

    ff_init_ff_sine_windows(5);

    ff_atrac_generate_tables();

    fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
    if (!fdsp)
        return AVERROR(ENOMEM);
    q->vector_fmul_window = fdsp->vector_fmul_window;
    av_free(fdsp);

    q->bands[0] = q->low;
    q->bands[1] = q->mid;
    q->bands[2] = q->high;

    /* Prepare the mdct overlap buffers */
    q->SUs[0].spectrum[0] = q->SUs[0].spec1;
    q->SUs[0].spectrum[1] = q->SUs[0].spec2;
    q->SUs[1].spectrum[0] = q->SUs[1].spec1;
    q->SUs[1].spectrum[1] = q->SUs[1].spec2;

    return 0;
}


AVCodec ff_atrac1_decoder = {
    .name           = "atrac1",
    .long_name      = NULL_IF_CONFIG_SMALL("ATRAC1 (Adaptive TRansform Acoustic Coding)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_ATRAC1,
    .priv_data_size = sizeof(AT1Ctx),
    .init           = atrac1_decode_init,
    .close          = atrac1_decode_end,
    .decode         = atrac1_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                      AV_SAMPLE_FMT_NONE },
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* ATRAC1 compatible decoder
3			* Copyright (c) 2009 Maxim Poliakovski
4			* Copyright (c) 2009 Benjamin Larsson
5			*
6			* This file is part of FFmpeg.
7			*
8			* FFmpeg is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser General Public
10			* License as published by the Free Software Foundation; either
11			* version 2.1 of the License, or (at your option) any later version.
12			*
13			* FFmpeg is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Lesser General Public License for more details.
17			*
18			* You should have received a copy of the GNU Lesser General Public
19			* License along with FFmpeg; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21			*/
22
23			/**
24			* @file
25			* ATRAC1 compatible decoder.
26			* This decoder handles raw ATRAC1 data and probably SDDS data.
27			*/
28
29			/* Many thanks to Tim Craig for all the help! */
30
31			#include <math.h>
32			#include <stddef.h>
33			#include <stdio.h>
34
35			#include "libavutil/float_dsp.h"
36			#include "libavutil/mem_internal.h"
37
38			#include "avcodec.h"
39			#include "get_bits.h"
40			#include "fft.h"
41			#include "internal.h"
42			#include "sinewin.h"
43
44			#include "atrac.h"
45			#include "atrac1data.h"
46
47			#define AT1_MAX_BFU 52 ///< max number of block floating units in a sound unit
48			#define AT1_SU_SIZE 212 ///< number of bytes in a sound unit
49			#define AT1_SU_SAMPLES 512 ///< number of samples in a sound unit
50			#define AT1_FRAME_SIZE AT1_SU_SIZE * 2
51			#define AT1_SU_MAX_BITS AT1_SU_SIZE * 8
52			#define AT1_MAX_CHANNELS 2
53
54			#define AT1_QMF_BANDS 3
55			#define IDX_LOW_BAND 0
56			#define IDX_MID_BAND 1
57			#define IDX_HIGH_BAND 2
58
59			/**
60			* Sound unit struct, one unit is used per channel
61			*/
62			typedef struct AT1SUCtx {
63			int log2_block_count[AT1_QMF_BANDS]; ///< log2 number of blocks in a band
64			int num_bfus; ///< number of Block Floating Units
65			float* spectrum[2];
66			DECLARE_ALIGNED(32, float, spec1)[AT1_SU_SAMPLES]; ///< mdct buffer
67			DECLARE_ALIGNED(32, float, spec2)[AT1_SU_SAMPLES]; ///< mdct buffer
68			DECLARE_ALIGNED(32, float, fst_qmf_delay)[46]; ///< delay line for the 1st stacked QMF filter
69			DECLARE_ALIGNED(32, float, snd_qmf_delay)[46]; ///< delay line for the 2nd stacked QMF filter
70			DECLARE_ALIGNED(32, float, last_qmf_delay)[256+39]; ///< delay line for the last stacked QMF filter
71			} AT1SUCtx;
72
73			/**
74			* The atrac1 context, holds all needed parameters for decoding
75			*/
76			typedef struct AT1Ctx {
77			AT1SUCtx SUs[AT1_MAX_CHANNELS]; ///< channel sound unit
78			DECLARE_ALIGNED(32, float, spec)[AT1_SU_SAMPLES]; ///< the mdct spectrum buffer
79
80			DECLARE_ALIGNED(32, float, low)[256];
81			DECLARE_ALIGNED(32, float, mid)[256];
82			DECLARE_ALIGNED(32, float, high)[512];
83			float* bands[3];
84			FFTContext mdct_ctx[3];
85			void (vector_fmul_window)(float dst, const float *src0,
86			const float src1, const float win, int len);
87			} AT1Ctx;
88
89			/** size of the transform in samples in the long mode for each QMF band */
90			static const uint16_t samples_per_band[3] = {128, 128, 256};
91			static const uint8_t mdct_long_nbits[3] = {7, 7, 8};
92
93
94		7157	static void at1_imdct(AT1Ctx q, float spec, float *out, int nbits,
95			int rev_spec)
96			{
97		7157	FFTContext* mdct_context = &q->mdct_ctx[nbits - 5 - (nbits > 6)];
98		7157	int transf_size = 1 << nbits;
99
100	✓✓	7157	if (rev_spec) {
101			int i;
102	✓✓	459048	for (i = 0; i < transf_size / 2; i++)
103		454272	FFSWAP(float, spec[i], spec[transf_size - 1 - i]);
104			}
105		7157	mdct_context->imdct_half(mdct_context, out, spec);
106		7157	}
107
108
109		2366	static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q)
110			{
111			int band_num, band_samples, log2_block_count, nbits, num_blocks, block_size;
112		2366	unsigned int start_pos, ref_pos = 0, pos = 0;
113
114	✓✓	9464	for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
115			float *prev_buf;
116			int j;
117
118		7098	band_samples = samples_per_band[band_num];
119		7098	log2_block_count = su->log2_block_count[band_num];
120
121			/* number of mdct blocks in the current QMF band: 1 - for long mode */
122			/* 4 for short mode(low/middle bands) and 8 for short mode(high band)*/
123		7098	num_blocks = 1 << log2_block_count;
124
125	✓✓	7098	if (num_blocks == 1) {
126			/* mdct block size in samples: 128 (long mode, low & mid bands), */
127			/* 256 (long mode, high band) and 32 (short mode, all bands) */
128		7085	block_size = band_samples >> log2_block_count;
129
130			/* calc transform size in bits according to the block_size_mode */
131		7085	nbits = mdct_long_nbits[band_num] - log2_block_count;
132
133	✓✗✓✓ ✗✓	7085	if (nbits != 5 && nbits != 7 && nbits != 8)
134			return AVERROR_INVALIDDATA;
135			} else {
136		13	block_size = 32;
137		13	nbits = 5;
138			}
139
140		7098	start_pos = 0;
141		7098	prev_buf = &su->spectrum[1][ref_pos + band_samples - 16];
142	✓✓	14255	for (j=0; j < num_blocks; j++) {
143		7157	at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], nbits, band_num);
144
145			/* overlap and window */
146		7157	q->vector_fmul_window(&q->bands[band_num][start_pos], prev_buf,
147		7157	&su->spectrum[0][ref_pos + start_pos], ff_sine_32, 16);
148
149		7157	prev_buf = &su->spectrum[0][ref_pos+start_pos + 16];
150		7157	start_pos += block_size;
151		7157	pos += block_size;
152			}
153
154	✓✓	7098	if (num_blocks == 1)
155		7085	memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float));
156
157		7098	ref_pos += band_samples;
158			}
159
160			/* Swap buffers so the mdct overlap works */
161		2366	FFSWAP(float*, su->spectrum[0], su->spectrum[1]);
162
163		2366	return 0;
164			}
165
166			/**
167			* Parse the block size mode byte
168			*/
169
170		2366	static int at1_parse_bsm(GetBitContext* gb, int log2_block_cnt[AT1_QMF_BANDS])
171			{
172			int log2_block_count_tmp, i;
173
174	✓✓	7098	for (i = 0; i < 2; i++) {
175			/* low and mid band */
176		4732	log2_block_count_tmp = get_bits(gb, 2);
177	✗✓	4732	if (log2_block_count_tmp & 1)
178			return AVERROR_INVALIDDATA;
179		4732	log2_block_cnt[i] = 2 - log2_block_count_tmp;
180			}
181
182			/* high band */
183		2366	log2_block_count_tmp = get_bits(gb, 2);
184	✓✓✗✓	2366	if (log2_block_count_tmp != 0 && log2_block_count_tmp != 3)
185			return AVERROR_INVALIDDATA;
186		2366	log2_block_cnt[IDX_HIGH_BAND] = 3 - log2_block_count_tmp;
187
188		2366	skip_bits(gb, 2);
189		2366	return 0;
190			}
191
192
193		2366	static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
194			float spec[AT1_SU_SAMPLES])
195			{
196			int bits_used, band_num, bfu_num, i;
197			uint8_t idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
198			uint8_t idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
199
200			/* parse the info byte (2nd byte) telling how much BFUs were coded */
201		2366	su->num_bfus = bfu_amount_tab1[get_bits(gb, 3)];
202
203			/* calc number of consumed bits:
204			num_BFUs * (idwl(4bits) + idsf(6bits)) + log2_block_count(8bits) + info_byte(8bits)
205			+ info_byte_copy(8bits) + log2_block_count_copy(8bits) */
206		7098	bits_used = su->num_bfus * 10 + 32 +
207		2366	bfu_amount_tab2[get_bits(gb, 2)] +
208		2366	(bfu_amount_tab3[get_bits(gb, 3)] << 1);
209
210			/* get word length index (idwl) for each BFU */
211	✓✓	107674	for (i = 0; i < su->num_bfus; i++)
212		105308	idwls[i] = get_bits(gb, 4);
213
214			/* get scalefactor index (idsf) for each BFU */
215	✓✓	107674	for (i = 0; i < su->num_bfus; i++)
216		105308	idsfs[i] = get_bits(gb, 6);
217
218			/* zero idwl/idsf for empty BFUs */
219	✓✓	20090	for (i = su->num_bfus; i < AT1_MAX_BFU; i++)
220		17724	idwls[i] = idsfs[i] = 0;
221
222			/* read in the spectral data and reconstruct MDCT spectrum of this channel */
223	✓✓	9464	for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
224	✓✓	130130	for (bfu_num = bfu_bands_t[band_num]; bfu_num < bfu_bands_t[band_num+1]; bfu_num++) {
225			int pos;
226
227		123032	int num_specs = specs_per_bfu[bfu_num];
228		123032	int word_len = !!idwls[bfu_num] + idwls[bfu_num];
229		123032	float scale_factor = ff_atrac_sf_table[idsfs[bfu_num]];
230		123032	bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */
231
232			/* check for bitstream overflow */
233	✗✓	123032	if (bits_used > AT1_SU_MAX_BITS)
234			return AVERROR_INVALIDDATA;
235
236			/* get the position of the 1st spec according to the block size mode */
237	✓✓	123032	pos = su->log2_block_count[band_num] ? bfu_start_short[bfu_num] : bfu_start_long[bfu_num];
238
239	✓✓	123032	if (word_len) {
240		57252	float max_quant = 1.0 / (float)((1 << (word_len - 1)) - 1);
241
242	✓✓	555280	for (i = 0; i < num_specs; i++) {
243			/* read in a quantized spec and convert it to
244			* signed int and then inverse quantization
245			*/
246		498028	spec[pos+i] = get_sbits(gb, word_len) * scale_factor * max_quant;
247			}
248			} else { /* word_len = 0 -> empty BFU, zero all specs in the empty BFU */
249		65780	memset(&spec[pos], 0, num_specs * sizeof(float));
250			}
251			}
252			}
253
254		2366	return 0;
255			}
256
257
258		2366	static void at1_subband_synthesis(AT1Ctx q, AT1SUCtx su, float *pOut)
259			{
260			float temp[256];
261			float iqmf_temp[512 + 46];
262
263			/* combine low and middle bands */
264		2366	ff_atrac_iqmf(q->bands[0], q->bands[1], 128, temp, su->fst_qmf_delay, iqmf_temp);
265
266			/* delay the signal of the high band by 39 samples */
267		2366	memcpy( su->last_qmf_delay, &su->last_qmf_delay[256], sizeof(float) * 39);
268		2366	memcpy(&su->last_qmf_delay[39], q->bands[2], sizeof(float) * 256);
269
270			/* combine (low + middle) and high bands */
271		2366	ff_atrac_iqmf(temp, su->last_qmf_delay, 256, pOut, su->snd_qmf_delay, iqmf_temp);
272		2366	}
273
274
275		1184	static int atrac1_decode_frame(AVCodecContext avctx, void data,
276			int got_frame_ptr, AVPacket avpkt)
277			{
278		1184	AVFrame *frame = data;
279		1184	const uint8_t *buf = avpkt->data;
280		1184	int buf_size = avpkt->size;
281		1184	AT1Ctx *q = avctx->priv_data;
282			int ch, ret;
283			GetBitContext gb;
284
285
286	✓✓	1184	if (buf_size < 212 * avctx->channels) {
287		1	av_log(avctx, AV_LOG_ERROR, "Not enough data to decode!\n");
288		1	return AVERROR_INVALIDDATA;
289			}
290
291			/* get output buffer */
292		1183	frame->nb_samples = AT1_SU_SAMPLES;
293	✗✓	1183	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
294			return ret;
295
296	✓✓	3549	for (ch = 0; ch < avctx->channels; ch++) {
297		2366	AT1SUCtx* su = &q->SUs[ch];
298
299		2366	init_get_bits(&gb, &buf[212 * ch], 212 * 8);
300
301			/* parse block_size_mode, 1st byte */
302		2366	ret = at1_parse_bsm(&gb, su->log2_block_count);
303	✗✓	2366	if (ret < 0)
304			return ret;
305
306		2366	ret = at1_unpack_dequant(&gb, su, q->spec);
307	✗✓	2366	if (ret < 0)
308			return ret;
309
310		2366	ret = at1_imdct_block(su, q);
311	✗✓	2366	if (ret < 0)
312			return ret;
313		2366	at1_subband_synthesis(q, su, (float *)frame->extended_data[ch]);
314			}
315
316		1183	*got_frame_ptr = 1;
317
318		1183	return avctx->block_align;
319			}
320
321
322		5	static av_cold int atrac1_decode_end(AVCodecContext * avctx)
323			{
324		5	AT1Ctx *q = avctx->priv_data;
325
326		5	ff_mdct_end(&q->mdct_ctx[0]);
327		5	ff_mdct_end(&q->mdct_ctx[1]);
328		5	ff_mdct_end(&q->mdct_ctx[2]);
329
330		5	return 0;
331			}
332
333
334		5	static av_cold int atrac1_decode_init(AVCodecContext *avctx)
335			{
336		5	AT1Ctx *q = avctx->priv_data;
337			AVFloatDSPContext *fdsp;
338			int ret;
339
340		5	avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
341
342	✓✗✗✓	5	if (avctx->channels < 1 \|\| avctx->channels > AT1_MAX_CHANNELS) {
343			av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n",
344			avctx->channels);
345			return AVERROR(EINVAL);
346			}
347
348	✗✓	5	if (avctx->block_align <= 0) {
349			av_log(avctx, AV_LOG_ERROR, "Unsupported block align.");
350			return AVERROR_PATCHWELCOME;
351			}
352
353			/* Init the mdct transforms */
354	✓✗✓✗	10	if ((ret = ff_mdct_init(&q->mdct_ctx[0], 6, 1, -1.0/ (1 << 15))) \|\|
355	✗✓	10	(ret = ff_mdct_init(&q->mdct_ctx[1], 8, 1, -1.0/ (1 << 15))) \|\|
356		5	(ret = ff_mdct_init(&q->mdct_ctx[2], 9, 1, -1.0/ (1 << 15)))) {
357			av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
358			return ret;
359			}
360
361		5	ff_init_ff_sine_windows(5);
362
363		5	ff_atrac_generate_tables();
364
365		5	fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
366	✗✓	5	if (!fdsp)
367			return AVERROR(ENOMEM);
368		5	q->vector_fmul_window = fdsp->vector_fmul_window;
369		5	av_free(fdsp);
370
371		5	q->bands[0] = q->low;
372		5	q->bands[1] = q->mid;
373		5	q->bands[2] = q->high;
374
375			/* Prepare the mdct overlap buffers */
376		5	q->SUs[0].spectrum[0] = q->SUs[0].spec1;
377		5	q->SUs[0].spectrum[1] = q->SUs[0].spec2;
378		5	q->SUs[1].spectrum[0] = q->SUs[1].spec1;
379		5	q->SUs[1].spectrum[1] = q->SUs[1].spec2;
380
381		5	return 0;
382			}
383
384
385			AVCodec ff_atrac1_decoder = {
386			.name = "atrac1",
387			.long_name = NULL_IF_CONFIG_SMALL("ATRAC1 (Adaptive TRansform Acoustic Coding)"),
388			.type = AVMEDIA_TYPE_AUDIO,
389			.id = AV_CODEC_ID_ATRAC1,
390			.priv_data_size = sizeof(AT1Ctx),
391			.init = atrac1_decode_init,
392			.close = atrac1_decode_end,
393			.decode = atrac1_decode_frame,
394			.capabilities = AV_CODEC_CAP_DR1,
395			.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
396			AV_SAMPLE_FMT_NONE },
397			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE \| FF_CODEC_CAP_INIT_CLEANUP,
398			};