Head

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/adxenc.c	Lines:	89	99	89.9 %
Date:	2020-01-29 01:05:39	Branches:	33	38	86.8 %


/*
 * ADX ADPCM codecs
 * Copyright (c) 2001,2003 BERO
 *
 * 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
 */

#include "avcodec.h"
#include "adx.h"
#include "bytestream.h"
#include "internal.h"
#include "put_bits.h"

/**
 * @file
 * SEGA CRI adx codecs.
 *
 * Reference documents:
 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
 */

static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
                       ADXChannelState *prev, int channels)
{
    PutBitContext pb;
    int scale;
    int i, j;
    int s0, s1, s2, d;
    int max = 0;
    int min = 0;

    s1 = prev->s1;
    s2 = prev->s2;
    for (i = 0, j = 0; j < 32; i += channels, j++) {
        s0 = wav[i];
        d = s0 + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS);
        if (max < d)
            max = d;
        if (min > d)
            min = d;
        s2 = s1;
        s1 = s0;
    }

    if (max == 0 && min == 0) {
        prev->s1 = s1;
        prev->s2 = s2;
        memset(adx, 0, BLOCK_SIZE);
        return;
    }

    if (max / 7 > -min / 8)
        scale = max / 7;
    else
        scale = -min / 8;

    if (scale == 0)
        scale = 1;

    AV_WB16(adx, scale);

    init_put_bits(&pb, adx + 2, 16);

    s1 = prev->s1;
    s2 = prev->s2;
    for (i = 0, j = 0; j < 32; i += channels, j++) {
        d = wav[i] + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS);

        d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);

        put_sbits(&pb, 4, d);

        s0 = d * scale + ((c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS);
        s2 = s1;
        s1 = s0;
    }
    prev->s1 = s1;
    prev->s2 = s2;

    flush_put_bits(&pb);
}

#define HEADER_SIZE 36

static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
{
    ADXContext *c = avctx->priv_data;

    bytestream_put_be16(&buf, 0x8000);              /* header signature */
    bytestream_put_be16(&buf, HEADER_SIZE - 4);     /* copyright offset */
    bytestream_put_byte(&buf, 3);                   /* encoding */
    bytestream_put_byte(&buf, BLOCK_SIZE);          /* block size */
    bytestream_put_byte(&buf, 4);                   /* sample size */
    bytestream_put_byte(&buf, avctx->channels);     /* channels */
    bytestream_put_be32(&buf, avctx->sample_rate);  /* sample rate */
    bytestream_put_be32(&buf, 0);                   /* total sample count */
    bytestream_put_be16(&buf, c->cutoff);           /* cutoff frequency */
    bytestream_put_byte(&buf, 3);                   /* version */
    bytestream_put_byte(&buf, 0);                   /* flags */
    bytestream_put_be32(&buf, 0);                   /* unknown */
    bytestream_put_be32(&buf, 0);                   /* loop enabled */
    bytestream_put_be16(&buf, 0);                   /* padding */
    bytestream_put_buffer(&buf, "(c)CRI", 6);       /* copyright signature */

    return HEADER_SIZE;
}

static av_cold int adx_encode_init(AVCodecContext *avctx)
{
    ADXContext *c = avctx->priv_data;

    if (avctx->channels > 2) {
        av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
        return AVERROR(EINVAL);
    }
    avctx->frame_size = BLOCK_SAMPLES;

    /* the cutoff can be adjusted, but this seems to work pretty well */
    c->cutoff = 500;
    ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);

    return 0;
}

static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                            const AVFrame *frame, int *got_packet_ptr)
{
    ADXContext *c          = avctx->priv_data;
    const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
    uint8_t *dst;
    int ch, out_size, ret;

    if (!samples) {
        if (c->eof)
            return 0;
        if ((ret = ff_alloc_packet2(avctx, avpkt, 18, 0)) < 0)
            return ret;
        c->eof = 1;
        dst = avpkt->data;
        bytestream_put_be16(&dst, 0x8001);
        bytestream_put_be16(&dst, 0x000E);
        bytestream_put_be64(&dst, 0x0);
        bytestream_put_be32(&dst, 0x0);
        bytestream_put_be16(&dst, 0x0);
        *got_packet_ptr = 1;
        return 0;
    }

    out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
    if ((ret = ff_alloc_packet2(avctx, avpkt, out_size, 0)) < 0)
        return ret;
    dst = avpkt->data;

    if (!c->header_parsed) {
        int hdrsize;
        if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
            return AVERROR(EINVAL);
        }
        dst      += hdrsize;
        c->header_parsed = 1;
    }

    for (ch = 0; ch < avctx->channels; ch++) {
        adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
        dst += BLOCK_SIZE;
    }

    avpkt->pts = frame->pts;
    avpkt->duration = frame->nb_samples;
    *got_packet_ptr = 1;
    return 0;
}

AVCodec ff_adpcm_adx_encoder = {
    .name           = "adpcm_adx",
    .long_name      = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_ADPCM_ADX,
    .priv_data_size = sizeof(ADXContext),
    .init           = adx_encode_init,
    .encode2        = adx_encode_frame,
    .capabilities   = AV_CODEC_CAP_DELAY,
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                      AV_SAMPLE_FMT_NONE },
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* ADX ADPCM codecs
3			* Copyright (c) 2001,2003 BERO
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			#include "avcodec.h"
23			#include "adx.h"
24			#include "bytestream.h"
25			#include "internal.h"
26			#include "put_bits.h"
27
28			/**
29			* @file
30			* SEGA CRI adx codecs.
31			*
32			* Reference documents:
33			* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
34			* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
35			*/
36
37		33076	static void adx_encode(ADXContext c, uint8_t adx, const int16_t *wav,
38			ADXChannelState *prev, int channels)
39			{
40			PutBitContext pb;
41			int scale;
42			int i, j;
43			int s0, s1, s2, d;
44		33076	int max = 0;
45		33076	int min = 0;
46
47		33076	s1 = prev->s1;
48		33076	s2 = prev->s2;
49	✓✓	1091508	for (i = 0, j = 0; j < 32; i += channels, j++) {
50		1058432	s0 = wav[i];
51		1058432	d = s0 + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS);
52	✓✓	1058432	if (max < d)
53		189764	max = d;
54	✓✓	1058432	if (min > d)
55		192954	min = d;
56		1058432	s2 = s1;
57		1058432	s1 = s0;
58			}
59
60	✓✓✗✓	33076	if (max == 0 && min == 0) {
61			prev->s1 = s1;
62			prev->s2 = s2;
63			memset(adx, 0, BLOCK_SIZE);
64			return;
65			}
66
67	✓✓	33076	if (max / 7 > -min / 8)
68		27914	scale = max / 7;
69			else
70		5162	scale = -min / 8;
71
72	✓✓	33076	if (scale == 0)
73		998	scale = 1;
74
75		33076	AV_WB16(adx, scale);
76
77		33076	init_put_bits(&pb, adx + 2, 16);
78
79		33076	s1 = prev->s1;
80		33076	s2 = prev->s2;
81	✓✓	1091508	for (i = 0, j = 0; j < 32; i += channels, j++) {
82		1058432	d = wav[i] + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS);
83
84	✓✓	1058432	d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);
85
86		1058432	put_sbits(&pb, 4, d);
87
88		1058432	s0 = d * scale + ((c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS);
89		1058432	s2 = s1;
90		1058432	s1 = s0;
91			}
92		33076	prev->s1 = s1;
93		33076	prev->s2 = s2;
94
95		33076	flush_put_bits(&pb);
96			}
97
98			#define HEADER_SIZE 36
99
100		2	static int adx_encode_header(AVCodecContext avctx, uint8_t buf, int bufsize)
101			{
102		2	ADXContext *c = avctx->priv_data;
103
104		2	bytestream_put_be16(&buf, 0x8000); /* header signature */
105		2	bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */
106		2	bytestream_put_byte(&buf, 3); /* encoding */
107		2	bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */
108		2	bytestream_put_byte(&buf, 4); /* sample size */
109		2	bytestream_put_byte(&buf, avctx->channels); /* channels */
110		2	bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */
111		2	bytestream_put_be32(&buf, 0); /* total sample count */
112		2	bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */
113		2	bytestream_put_byte(&buf, 3); /* version */
114		2	bytestream_put_byte(&buf, 0); /* flags */
115		2	bytestream_put_be32(&buf, 0); /* unknown */
116		2	bytestream_put_be32(&buf, 0); /* loop enabled */
117		2	bytestream_put_be16(&buf, 0); /* padding */
118		2	bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */
119
120		2	return HEADER_SIZE;
121			}
122
123		2	static av_cold int adx_encode_init(AVCodecContext *avctx)
124			{
125		2	ADXContext *c = avctx->priv_data;
126
127	✗✓	2	if (avctx->channels > 2) {
128			av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
129			return AVERROR(EINVAL);
130			}
131		2	avctx->frame_size = BLOCK_SAMPLES;
132
133			/* the cutoff can be adjusted, but this seems to work pretty well */
134		2	c->cutoff = 500;
135		2	ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
136
137		2	return 0;
138			}
139
140		16542	static int adx_encode_frame(AVCodecContext avctx, AVPacket avpkt,
141			const AVFrame frame, int got_packet_ptr)
142			{
143		16542	ADXContext *c = avctx->priv_data;
144	✓✓	16542	const int16_t samples = frame ? (const int16_t )frame->data[0] : NULL;
145			uint8_t *dst;
146			int ch, out_size, ret;
147
148	✓✓	16542	if (!samples) {
149	✓✓	4	if (c->eof)
150		2	return 0;
151	✗✓	2	if ((ret = ff_alloc_packet2(avctx, avpkt, 18, 0)) < 0)
152			return ret;
153		2	c->eof = 1;
154		2	dst = avpkt->data;
155		2	bytestream_put_be16(&dst, 0x8001);
156		2	bytestream_put_be16(&dst, 0x000E);
157		2	bytestream_put_be64(&dst, 0x0);
158		2	bytestream_put_be32(&dst, 0x0);
159		2	bytestream_put_be16(&dst, 0x0);
160		2	*got_packet_ptr = 1;
161		2	return 0;
162			}
163
164	✓✓	16538	out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
165	✗✓	16538	if ((ret = ff_alloc_packet2(avctx, avpkt, out_size, 0)) < 0)
166			return ret;
167		16538	dst = avpkt->data;
168
169	✓✓	16538	if (!c->header_parsed) {
170			int hdrsize;
171	✗✓	2	if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
172			av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
173			return AVERROR(EINVAL);
174			}
175		2	dst += hdrsize;
176		2	c->header_parsed = 1;
177			}
178
179	✓✓	49614	for (ch = 0; ch < avctx->channels; ch++) {
180		33076	adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
181		33076	dst += BLOCK_SIZE;
182			}
183
184		16538	avpkt->pts = frame->pts;
185		16538	avpkt->duration = frame->nb_samples;
186		16538	*got_packet_ptr = 1;
187		16538	return 0;
188			}
189
190			AVCodec ff_adpcm_adx_encoder = {
191			.name = "adpcm_adx",
192			.long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
193			.type = AVMEDIA_TYPE_AUDIO,
194			.id = AV_CODEC_ID_ADPCM_ADX,
195			.priv_data_size = sizeof(ADXContext),
196			.init = adx_encode_init,
197			.encode2 = adx_encode_frame,
198			.capabilities = AV_CODEC_CAP_DELAY,
199			.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
200			AV_SAMPLE_FMT_NONE },
201			};