FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/tta.c	Lines:	140	203	69.0 %
Date:	2021-04-22 14:24:15	Branches:	73	120	60.8 %


/*
 * TTA (The Lossless True Audio) decoder
 * Copyright (c) 2006 Alex Beregszaszi
 *
 * 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
 * TTA (The Lossless True Audio) decoder
 * @see http://www.true-audio.com/
 * @see http://tta.corecodec.org/
 * @author Alex Beregszaszi
 */

#include <limits.h>

#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"

#define BITSTREAM_READER_LE
#include "ttadata.h"
#include "ttadsp.h"
#include "avcodec.h"
#include "get_bits.h"
#include "thread.h"
#include "unary.h"
#include "internal.h"

#define FORMAT_SIMPLE    1
#define FORMAT_ENCRYPTED 2

typedef struct TTAContext {
    AVClass *class;
    AVCodecContext *avctx;
    const AVCRC *crc_table;

    int format, channels, bps;
    unsigned data_length;
    int frame_length, last_frame_length;

    int32_t *decode_buffer;

    uint8_t crc_pass[8];
    uint8_t *pass;
    TTAChannel *ch_ctx;
    TTADSPContext dsp;
} TTAContext;

static const int64_t tta_channel_layouts[7] = {
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
    AV_CH_LAYOUT_QUAD,
    0,
    AV_CH_LAYOUT_5POINT1_BACK,
    AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
    AV_CH_LAYOUT_7POINT1_WIDE
};

static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
{
    uint32_t crc, CRC;

    CRC = AV_RL32(buf + buf_size);
    crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
    if (CRC != (crc ^ 0xFFFFFFFFU)) {
        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

static uint64_t tta_check_crc64(uint8_t *pass)
{
    uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
    uint8_t *end = pass + strlen(pass);
    int i;

    while (pass < end) {
        crc ^= (uint64_t)*pass++ << 56;
        for (i = 0; i < 8; i++)
            crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
    }

    return crc ^ UINT64_MAX;
}

static int allocate_buffers(AVCodecContext *avctx)
{
    TTAContext *s = avctx->priv_data;

    if (s->bps < 3) {
        s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels);
        if (!s->decode_buffer)
            return AVERROR(ENOMEM);
    } else
        s->decode_buffer = NULL;
    s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
    if (!s->ch_ctx) {
        av_freep(&s->decode_buffer);
        return AVERROR(ENOMEM);
    }

    return 0;
}

static av_cold int tta_decode_init(AVCodecContext * avctx)
{
    TTAContext *s = avctx->priv_data;
    GetBitContext gb;
    int total_frames;
    int ret;

    s->avctx = avctx;

    // 22 bytes for a TTA1 header
    if (avctx->extradata_size < 22)
        return AVERROR_INVALIDDATA;

    s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
    ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
    if (ret < 0)
        return ret;

    if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
        /* signature */
        skip_bits_long(&gb, 32);

        s->format = get_bits(&gb, 16);
        if (s->format > 2) {
            av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
            return AVERROR_INVALIDDATA;
        }
        if (s->format == FORMAT_ENCRYPTED) {
            if (!s->pass) {
                av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
                return AVERROR(EINVAL);
            }
            AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
        }
        avctx->channels = s->channels = get_bits(&gb, 16);
        if (s->channels > 1 && s->channels < 9)
            avctx->channel_layout = tta_channel_layouts[s->channels-2];
        avctx->bits_per_raw_sample = get_bits(&gb, 16);
        s->bps = (avctx->bits_per_raw_sample + 7) / 8;
        avctx->sample_rate = get_bits_long(&gb, 32);
        s->data_length = get_bits_long(&gb, 32);
        skip_bits_long(&gb, 32); // CRC32 of header

        if (s->channels == 0 || s->channels > 16) {
            av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
            return AVERROR_INVALIDDATA;
        } else if (avctx->sample_rate == 0) {
            av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
            return AVERROR_INVALIDDATA;
        }

        switch(s->bps) {
        case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
        case 2:
            avctx->sample_fmt = AV_SAMPLE_FMT_S16;
            break;
        case 3:
            avctx->sample_fmt = AV_SAMPLE_FMT_S32;
            break;
        //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
            return AVERROR_INVALIDDATA;
        }

        // prevent overflow
        if (avctx->sample_rate > 0x7FFFFFu) {
            av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
            return AVERROR(EINVAL);
        }
        s->frame_length = 256 * avctx->sample_rate / 245;

        s->last_frame_length = s->data_length % s->frame_length;
        total_frames = s->data_length / s->frame_length +
                       (s->last_frame_length ? 1 : 0);

        av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
            s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
            avctx->block_align);
        av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
            s->data_length, s->frame_length, s->last_frame_length, total_frames);

        if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
            av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
            return AVERROR_INVALIDDATA;
        }
    } else {
        av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
        return AVERROR_INVALIDDATA;
    }

    ff_ttadsp_init(&s->dsp);

    return allocate_buffers(avctx);
}

static int tta_decode_frame(AVCodecContext *avctx, void *data,
                            int *got_frame_ptr, AVPacket *avpkt)
{
    AVFrame *frame     = data;
    ThreadFrame tframe = { .f = data };
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    TTAContext *s = avctx->priv_data;
    GetBitContext gb;
    int i, ret;
    int cur_chan = 0, framelen = s->frame_length;
    uint32_t *p;

    if (avctx->err_recognition & AV_EF_CRCCHECK) {
        if (buf_size < 4 ||
            (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
            return AVERROR_INVALIDDATA;
    }

    if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
        return ret;

    /* get output buffer */
    frame->nb_samples = framelen;
    if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
        return ret;

    // decode directly to output buffer for 24-bit sample format
    if (s->bps == 3)
        s->decode_buffer = (int32_t *)frame->data[0];

    // init per channel states
    for (i = 0; i < s->channels; i++) {
        TTAFilter *filter = &s->ch_ctx[i].filter;
        s->ch_ctx[i].predictor = 0;
        ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]);
        if (s->format == FORMAT_ENCRYPTED) {
            int i;
            for (i = 0; i < 8; i++)
                filter->qm[i] = sign_extend(s->crc_pass[i], 8);
        }
        ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
    }

    i = 0;
    for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++) {
        int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
        TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
        TTARice *rice = &s->ch_ctx[cur_chan].rice;
        uint32_t unary, depth, k;
        int32_t value;

        unary = get_unary(&gb, 0, get_bits_left(&gb));

        if (unary == 0) {
            depth = 0;
            k = rice->k0;
        } else {
            depth = 1;
            k = rice->k1;
            unary--;
        }

        if (get_bits_left(&gb) < k) {
            ret = AVERROR_INVALIDDATA;
            goto error;
        }

        if (k) {
            if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {
                ret = AVERROR_INVALIDDATA;
                goto error;
            }
            value = (unary << k) + get_bits(&gb, k);
        } else
            value = unary;

        // FIXME: copy paste from original
        switch (depth) {
        case 1:
            rice->sum1 += value - (rice->sum1 >> 4);
            if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
                rice->k1--;
            else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
                rice->k1++;
            value += ff_tta_shift_1[rice->k0];
        default:
            rice->sum0 += value - (rice->sum0 >> 4);
            if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
                rice->k0--;
            else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
                rice->k0++;
        }

        // extract coded value
        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));

        // run hybrid filter
        s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
                              filter->shift, filter->round);

        // fixed order prediction
#define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
        switch (s->bps) {
        case 1: *p += PRED(*predictor, 4); break;
        case 2:
        case 3: *p += PRED(*predictor, 5); break;
        case 4: *p +=      *predictor;     break;
        }
        *predictor = *p;

        // flip channels
        if (cur_chan < (s->channels-1))
            cur_chan++;
        else {
            // decorrelate in case of multiple channels
            if (s->channels > 1) {
                int32_t *r = p - 1;
                for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)
                    *r = *(r + 1) - *r;
            }
            cur_chan = 0;
            i++;
            // check for last frame
            if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
                frame->nb_samples = framelen = s->last_frame_length;
                break;
            }
        }
    }

    align_get_bits(&gb);
    if (get_bits_left(&gb) < 32) {
        ret = AVERROR_INVALIDDATA;
        goto error;
    }
    skip_bits_long(&gb, 32); // frame crc

    // convert to output buffer
    switch (s->bps) {
    case 1: {
        uint8_t *samples = (uint8_t *)frame->data[0];
        for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)
            *samples++ = *p + 0x80;
        break;
        }
    case 2: {
        int16_t *samples = (int16_t *)frame->data[0];
        for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)
            *samples++ = *p;
        break;
        }
    case 3: {
        // shift samples for 24-bit sample format
        int32_t *samples = (int32_t *)frame->data[0];
        for (i = 0; i < framelen * s->channels; i++)
            *samples++ *= 256;
        // reset decode buffer
        s->decode_buffer = NULL;
        break;
        }
    }

    *got_frame_ptr = 1;

    return buf_size;
error:
    // reset decode buffer
    if (s->bps == 3)
        s->decode_buffer = NULL;
    return ret;
}

static av_cold int tta_decode_close(AVCodecContext *avctx) {
    TTAContext *s = avctx->priv_data;

    if (s->bps < 3)
        av_freep(&s->decode_buffer);
    s->decode_buffer = NULL;
    av_freep(&s->ch_ctx);

    return 0;
}

#define OFFSET(x) offsetof(TTAContext, x)
#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
static const AVOption options[] = {
    { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
    { NULL },
};

static const AVClass tta_decoder_class = {
    .class_name = "TTA Decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_tta_decoder = {
    .name           = "tta",
    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_TTA,
    .priv_data_size = sizeof(TTAContext),
    .init           = tta_decode_init,
    .close          = tta_decode_close,
    .decode         = tta_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,
    .priv_class     = &tta_decoder_class,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* TTA (The Lossless True Audio) decoder
3			* Copyright (c) 2006 Alex Beregszaszi
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* TTA (The Lossless True Audio) decoder
25			* @see http://www.true-audio.com/
26			* @see http://tta.corecodec.org/
27			* @author Alex Beregszaszi
28			*/
29
30			#include <limits.h>
31
32			#include "libavutil/crc.h"
33			#include "libavutil/intreadwrite.h"
34			#include "libavutil/opt.h"
35
36			#define BITSTREAM_READER_LE
37			#include "ttadata.h"
38			#include "ttadsp.h"
39			#include "avcodec.h"
40			#include "get_bits.h"
41			#include "thread.h"
42			#include "unary.h"
43			#include "internal.h"
44
45			#define FORMAT_SIMPLE 1
46			#define FORMAT_ENCRYPTED 2
47
48			typedef struct TTAContext {
49			AVClass *class;
50			AVCodecContext *avctx;
51			const AVCRC *crc_table;
52
53			int format, channels, bps;
54			unsigned data_length;
55			int frame_length, last_frame_length;
56
57			int32_t *decode_buffer;
58
59			uint8_t crc_pass[8];
60			uint8_t *pass;
61			TTAChannel *ch_ctx;
62			TTADSPContext dsp;
63			} TTAContext;
64
65			static const int64_t tta_channel_layouts[7] = {
66			AV_CH_LAYOUT_STEREO,
67			AV_CH_LAYOUT_STEREO\|AV_CH_LOW_FREQUENCY,
68			AV_CH_LAYOUT_QUAD,
69			0,
70			AV_CH_LAYOUT_5POINT1_BACK,
71			AV_CH_LAYOUT_5POINT1_BACK\|AV_CH_BACK_CENTER,
72			AV_CH_LAYOUT_7POINT1_WIDE
73			};
74
75			static int tta_check_crc(TTAContext s, const uint8_t buf, int buf_size)
76			{
77			uint32_t crc, CRC;
78
79			CRC = AV_RL32(buf + buf_size);
80			crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
81			if (CRC != (crc ^ 0xFFFFFFFFU)) {
82			av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
83			return AVERROR_INVALIDDATA;
84			}
85
86			return 0;
87			}
88
89		2	static uint64_t tta_check_crc64(uint8_t *pass)
90			{
91		2	uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
92		2	uint8_t *end = pass + strlen(pass);
93			int i;
94
95	✓✓	14	while (pass < end) {
96		12	crc ^= (uint64_t)*pass++ << 56;
97	✓✓	108	for (i = 0; i < 8; i++)
98		96	crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
99			}
100
101		2	return crc ^ UINT64_MAX;
102			}
103
104		20	static int allocate_buffers(AVCodecContext *avctx)
105			{
106		20	TTAContext *s = avctx->priv_data;
107
108	✓✗	20	if (s->bps < 3) {
109		20	s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels);
110	✗✓	20	if (!s->decode_buffer)
111			return AVERROR(ENOMEM);
112			} else
113			s->decode_buffer = NULL;
114		20	s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
115	✗✓	20	if (!s->ch_ctx) {
116			av_freep(&s->decode_buffer);
117			return AVERROR(ENOMEM);
118			}
119
120		20	return 0;
121			}
122
123		20	static av_cold int tta_decode_init(AVCodecContext * avctx)
124			{
125		20	TTAContext *s = avctx->priv_data;
126			GetBitContext gb;
127			int total_frames;
128			int ret;
129
130		20	s->avctx = avctx;
131
132			// 22 bytes for a TTA1 header
133	✗✓	20	if (avctx->extradata_size < 22)
134			return AVERROR_INVALIDDATA;
135
136		20	s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
137		20	ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
138	✗✓	20	if (ret < 0)
139			return ret;
140
141	✓✗	20	if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
142			/* signature */
143		20	skip_bits_long(&gb, 32);
144
145		20	s->format = get_bits(&gb, 16);
146	✗✓	20	if (s->format > 2) {
147			av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
148			return AVERROR_INVALIDDATA;
149			}
150	✓✓	20	if (s->format == FORMAT_ENCRYPTED) {
151	✗✓	2	if (!s->pass) {
152			av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
153			return AVERROR(EINVAL);
154			}
155		2	AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
156			}
157		20	avctx->channels = s->channels = get_bits(&gb, 16);
158	✓✓✓✗	20	if (s->channels > 1 && s->channels < 9)
159		16	avctx->channel_layout = tta_channel_layouts[s->channels-2];
160		20	avctx->bits_per_raw_sample = get_bits(&gb, 16);
161		20	s->bps = (avctx->bits_per_raw_sample + 7) / 8;
162		20	avctx->sample_rate = get_bits_long(&gb, 32);
163		20	s->data_length = get_bits_long(&gb, 32);
164		20	skip_bits_long(&gb, 32); // CRC32 of header
165
166	✓✗✗✓	20	if (s->channels == 0 \|\| s->channels > 16) {
167			av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
168			return AVERROR_INVALIDDATA;
169	✗✓	20	} else if (avctx->sample_rate == 0) {
170			av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
171			return AVERROR_INVALIDDATA;
172			}
173
174	✗✓✗✗	20	switch(s->bps) {
175			case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
176		20	case 2:
177		20	avctx->sample_fmt = AV_SAMPLE_FMT_S16;
178		20	break;
179			case 3:
180			avctx->sample_fmt = AV_SAMPLE_FMT_S32;
181			break;
182			//case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
183			default:
184			av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
185			return AVERROR_INVALIDDATA;
186			}
187
188			// prevent overflow
189	✗✓	20	if (avctx->sample_rate > 0x7FFFFFu) {
190			av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
191			return AVERROR(EINVAL);
192			}
193		20	s->frame_length = 256 * avctx->sample_rate / 245;
194
195		20	s->last_frame_length = s->data_length % s->frame_length;
196		40	total_frames = s->data_length / s->frame_length +
197	✓✗	20	(s->last_frame_length ? 1 : 0);
198
199		20	av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
200			s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
201			avctx->block_align);
202		20	av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
203			s->data_length, s->frame_length, s->last_frame_length, total_frames);
204
205	✗✓	20	if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
206			av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
207			return AVERROR_INVALIDDATA;
208			}
209			} else {
210			av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
211			return AVERROR_INVALIDDATA;
212			}
213
214		20	ff_ttadsp_init(&s->dsp);
215
216		20	return allocate_buffers(avctx);
217			}
218
219		46	static int tta_decode_frame(AVCodecContext avctx, void data,
220			int got_frame_ptr, AVPacket avpkt)
221			{
222		46	AVFrame *frame = data;
223		46	ThreadFrame tframe = { .f = data };
224		46	const uint8_t *buf = avpkt->data;
225		46	int buf_size = avpkt->size;
226		46	TTAContext *s = avctx->priv_data;
227			GetBitContext gb;
228			int i, ret;
229		46	int cur_chan = 0, framelen = s->frame_length;
230			uint32_t *p;
231
232	✗✓	46	if (avctx->err_recognition & AV_EF_CRCCHECK) {
233			if (buf_size < 4 \|\|
234			(tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
235			return AVERROR_INVALIDDATA;
236			}
237
238	✗✓	46	if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
239			return ret;
240
241			/* get output buffer */
242		46	frame->nb_samples = framelen;
243	✗✓	46	if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
244			return ret;
245
246			// decode directly to output buffer for 24-bit sample format
247	✗✓	46	if (s->bps == 3)
248			s->decode_buffer = (int32_t *)frame->data[0];
249
250			// init per channel states
251	✓✓	134	for (i = 0; i < s->channels; i++) {
252		88	TTAFilter *filter = &s->ch_ctx[i].filter;
253		88	s->ch_ctx[i].predictor = 0;
254		88	ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]);
255	✓✓	88	if (s->format == FORMAT_ENCRYPTED) {
256			int i;
257	✓✓	162	for (i = 0; i < 8; i++)
258		144	filter->qm[i] = sign_extend(s->crc_pass[i], 8);
259			}
260		88	ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
261			}
262
263		46	i = 0;
264	✓✓	3824146	for (p = s->decode_buffer; (int32_t)p < s->decode_buffer + (framelen s->channels); p++) {
265		3824108	int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
266		3824108	TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
267		3824108	TTARice *rice = &s->ch_ctx[cur_chan].rice;
268			uint32_t unary, depth, k;
269			int32_t value;
270
271		3824108	unary = get_unary(&gb, 0, get_bits_left(&gb));
272
273	✓✓	3824108	if (unary == 0) {
274		1800079	depth = 0;
275		1800079	k = rice->k0;
276			} else {
277		2024029	depth = 1;
278		2024029	k = rice->k1;
279		2024029	unary--;
280			}
281
282	✗✓	3824108	if (get_bits_left(&gb) < k) {
283			ret = AVERROR_INVALIDDATA;
284			goto error;
285			}
286
287	✓✓	3824108	if (k) {
288	✓✗✗✓	3602502	if (k > MIN_CACHE_BITS \|\| unary > INT32_MAX >> k) {
289			ret = AVERROR_INVALIDDATA;
290			goto error;
291			}
292		3602502	value = (unary << k) + get_bits(&gb, k);
293			} else
294		221606	value = unary;
295
296			// FIXME: copy paste from original
297	✓✓	3824108	switch (depth) {
298		2024029	case 1:
299		2024029	rice->sum1 += value - (rice->sum1 >> 4);
300	✓✓✓✓	2024029	if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
301		55307	rice->k1--;
302	✓✓	1968722	else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
303		54952	rice->k1++;
304		2024029	value += ff_tta_shift_1[rice->k0];
305		3824108	default:
306		3824108	rice->sum0 += value - (rice->sum0 >> 4);
307	✓✓✓✓	3824108	if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
308		105062	rice->k0--;
309	✓✓	3719046	else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
310		104701	rice->k0++;
311			}
312
313			// extract coded value
314		3824108	*p = 1 + ((value >> 1) ^ ((value & 1) - 1));
315
316			// run hybrid filter
317		3824108	s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
318			filter->shift, filter->round);
319
320			// fixed order prediction
321			#define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
322	✗✓✗✗	3824108	switch (s->bps) {
323			case 1: p += PRED(predictor, 4); break;
324		3824108	case 2:
325		3824108	case 3: p += PRED(predictor, 5); break;
326			case 4: p += predictor; break;
327			}
328		3824108	predictor = p;
329
330			// flip channels
331	✓✓	3824108	if (cur_chan < (s->channels-1))
332		1823854	cur_chan++;
333			else {
334			// decorrelate in case of multiple channels
335	✓✓	2000254	if (s->channels > 1) {
336		1823854	int32_t *r = p - 1;
337	✓✓	3647708	for (p += r / 2; r > (int32_t*)p - s->channels; r--)
338		1823854	r = (r + 1) - *r;
339			}
340		2000254	cur_chan = 0;
341		2000254	i++;
342			// check for last frame
343	✓✓✓✓	2000254	if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
344		8	frame->nb_samples = framelen = s->last_frame_length;
345		8	break;
346			}
347			}
348			}
349
350		46	align_get_bits(&gb);
351	✗✓	46	if (get_bits_left(&gb) < 32) {
352			ret = AVERROR_INVALIDDATA;
353			goto error;
354			}
355		46	skip_bits_long(&gb, 32); // frame crc
356
357			// convert to output buffer
358	✗✓✗✗	46	switch (s->bps) {
359			case 1: {
360			uint8_t samples = (uint8_t )frame->data[0];
361			for (p = s->decode_buffer; (int32_t)p < s->decode_buffer + (framelen s->channels); p++)
362			samples++ = p + 0x80;
363			break;
364			}
365		46	case 2: {
366		46	int16_t samples = (int16_t )frame->data[0];
367	✓✓	3824154	for (p = s->decode_buffer; (int32_t)p < s->decode_buffer + (framelen s->channels); p++)
368		3824108	samples++ = p;
369		46	break;
370			}
371			case 3: {
372			// shift samples for 24-bit sample format
373			int32_t samples = (int32_t )frame->data[0];
374			for (i = 0; i < framelen * s->channels; i++)
375			samples++ = 256;
376			// reset decode buffer
377			s->decode_buffer = NULL;
378			break;
379			}
380			}
381
382		46	*got_frame_ptr = 1;
383
384		46	return buf_size;
385			error:
386			// reset decode buffer
387			if (s->bps == 3)
388			s->decode_buffer = NULL;
389			return ret;
390			}
391
392		20	static av_cold int tta_decode_close(AVCodecContext *avctx) {
393		20	TTAContext *s = avctx->priv_data;
394
395	✓✗	20	if (s->bps < 3)
396		20	av_freep(&s->decode_buffer);
397		20	s->decode_buffer = NULL;
398		20	av_freep(&s->ch_ctx);
399
400		20	return 0;
401			}
402
403			#define OFFSET(x) offsetof(TTAContext, x)
404			#define DEC (AV_OPT_FLAG_DECODING_PARAM \| AV_OPT_FLAG_AUDIO_PARAM)
405			static const AVOption options[] = {
406			{ "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
407			{ NULL },
408			};
409
410			static const AVClass tta_decoder_class = {
411			.class_name = "TTA Decoder",
412			.item_name = av_default_item_name,
413			.option = options,
414			.version = LIBAVUTIL_VERSION_INT,
415			};
416
417			AVCodec ff_tta_decoder = {
418			.name = "tta",
419			.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
420			.type = AVMEDIA_TYPE_AUDIO,
421			.id = AV_CODEC_ID_TTA,
422			.priv_data_size = sizeof(TTAContext),
423			.init = tta_decode_init,
424			.close = tta_decode_close,
425			.decode = tta_decode_frame,
426			.capabilities = AV_CODEC_CAP_DR1 \| AV_CODEC_CAP_FRAME_THREADS \| AV_CODEC_CAP_CHANNEL_CONF,
427			.priv_class = &tta_decoder_class,
428			};