Head

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/8svx.c	Lines:	50	70	71.4 %
Date:	2020-01-28 04:56:05	Branches:	19	35	54.3 %


/*
 * Copyright (C) 2008 Jaikrishnan Menon
 * Copyright (C) 2011 Stefano Sabatini
 *
 * 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
 * 8svx audio decoder
 * @author Jaikrishnan Menon
 *
 * supports: fibonacci delta encoding
 *         : exponential encoding
 *
 * For more information about the 8SVX format:
 * http://netghost.narod.ru/gff/vendspec/iff/iff.txt
 * http://sox.sourceforge.net/AudioFormats-11.html
 * http://aminet.net/package/mus/misc/wavepak
 * http://amigan.1emu.net/reg/8SVX.txt
 *
 * Samples can be found here:
 * http://aminet.net/mods/smpl/
 */

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "internal.h"
#include "libavutil/common.h"

/** decoder context */
typedef struct EightSvxContext {
    uint8_t fib_acc[2];
    const int8_t *table;

    /* buffer used to store the whole first packet.
       data is only sent as one large packet */
    uint8_t *data[2];
    int data_size;
    int data_idx;
} EightSvxContext;

static const int8_t fibonacci[16]   = { -34,  -21, -13,  -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8,  13, 21 };
static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 };

#define MAX_FRAME_SIZE 2048

/**
 * Delta decode the compressed values in src, and put the resulting
 * decoded samples in dst.
 *
 * @param[in,out] state starting value. it is saved for use in the next call.
 * @param table delta sequence table
 */
static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size,
                         uint8_t *state, const int8_t *table)
{
    uint8_t val = *state;

    while (src_size--) {
        uint8_t d = *src++;
        val = av_clip_uint8(val + table[d & 0xF]);
        *dst++ = val;
        val = av_clip_uint8(val + table[d >> 4]);
        *dst++ = val;
    }

    *state = val;
}

/** decode a frame */
static int eightsvx_decode_frame(AVCodecContext *avctx, void *data,
                                 int *got_frame_ptr, AVPacket *avpkt)
{
    EightSvxContext *esc = avctx->priv_data;
    AVFrame *frame       = data;
    int buf_size;
    int ch, ret;
    int hdr_size = 2;

    /* decode and interleave the first packet */
    if (!esc->data[0] && avpkt) {
        int chan_size = avpkt->size / avctx->channels - hdr_size;

        if (avpkt->size % avctx->channels) {
            av_log(avctx, AV_LOG_WARNING, "Packet with odd size, ignoring last byte\n");
        }
        if (avpkt->size < (hdr_size + 1) * avctx->channels) {
            av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
            return AVERROR_INVALIDDATA;
        }

        esc->fib_acc[0] = avpkt->data[1] + 128;
        if (avctx->channels == 2)
            esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128;

        esc->data_idx  = 0;
        esc->data_size = chan_size;
        if (!(esc->data[0] = av_malloc(chan_size)))
            return AVERROR(ENOMEM);
        if (avctx->channels == 2) {
            if (!(esc->data[1] = av_malloc(chan_size))) {
                av_freep(&esc->data[0]);
                return AVERROR(ENOMEM);
            }
        }
        memcpy(esc->data[0], &avpkt->data[hdr_size], chan_size);
        if (avctx->channels == 2)
            memcpy(esc->data[1], &avpkt->data[2*hdr_size+chan_size], chan_size);
    }
    if (!esc->data[0]) {
        av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n");
        return AVERROR_INVALIDDATA;
    }

    /* decode next piece of data from the buffer */
    buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx);
    if (buf_size <= 0) {
        *got_frame_ptr = 0;
        return avpkt->size;
    }

    /* get output buffer */
    frame->nb_samples = buf_size * 2;
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

    for (ch = 0; ch < avctx->channels; ch++) {
        delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx],
                     buf_size, &esc->fib_acc[ch], esc->table);
    }

    esc->data_idx += buf_size;

    *got_frame_ptr = 1;

    return ((avctx->frame_number == 0)*hdr_size + buf_size)*avctx->channels;
}

static av_cold int eightsvx_decode_init(AVCodecContext *avctx)
{
    EightSvxContext *esc = avctx->priv_data;

    if (avctx->channels < 1 || avctx->channels > 2) {
        av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n");
        return AVERROR_INVALIDDATA;
    }

    switch (avctx->codec->id) {
    case AV_CODEC_ID_8SVX_FIB: esc->table = fibonacci;    break;
    case AV_CODEC_ID_8SVX_EXP: esc->table = exponential;  break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Invalid codec id %d.\n", avctx->codec->id);
        return AVERROR_INVALIDDATA;
    }
    avctx->sample_fmt = AV_SAMPLE_FMT_U8P;

    return 0;
}

static av_cold int eightsvx_decode_close(AVCodecContext *avctx)
{
    EightSvxContext *esc = avctx->priv_data;

    av_freep(&esc->data[0]);
    av_freep(&esc->data[1]);
    esc->data_size = 0;
    esc->data_idx = 0;

    return 0;
}

#if CONFIG_EIGHTSVX_FIB_DECODER
AVCodec ff_eightsvx_fib_decoder = {
  .name           = "8svx_fib",
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
  .type           = AVMEDIA_TYPE_AUDIO,
  .id             = AV_CODEC_ID_8SVX_FIB,
  .priv_data_size = sizeof (EightSvxContext),
  .init           = eightsvx_decode_init,
  .decode         = eightsvx_decode_frame,
  .close          = eightsvx_decode_close,
  .capabilities   = AV_CODEC_CAP_DR1,
  .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
                                                    AV_SAMPLE_FMT_NONE },
};
#endif
#if CONFIG_EIGHTSVX_EXP_DECODER
AVCodec ff_eightsvx_exp_decoder = {
  .name           = "8svx_exp",
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX exponential"),
  .type           = AVMEDIA_TYPE_AUDIO,
  .id             = AV_CODEC_ID_8SVX_EXP,
  .priv_data_size = sizeof (EightSvxContext),
  .init           = eightsvx_decode_init,
  .decode         = eightsvx_decode_frame,
  .close          = eightsvx_decode_close,
  .capabilities   = AV_CODEC_CAP_DR1,
  .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
                                                    AV_SAMPLE_FMT_NONE },
};
#endif


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 2008 Jaikrishnan Menon
3			* Copyright (C) 2011 Stefano Sabatini
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			* 8svx audio decoder
25			* @author Jaikrishnan Menon
26			*
27			* supports: fibonacci delta encoding
28			* : exponential encoding
29			*
30			* For more information about the 8SVX format:
31			* http://netghost.narod.ru/gff/vendspec/iff/iff.txt
32			* http://sox.sourceforge.net/AudioFormats-11.html
33			* http://aminet.net/package/mus/misc/wavepak
34			* http://amigan.1emu.net/reg/8SVX.txt
35			*
36			* Samples can be found here:
37			* http://aminet.net/mods/smpl/
38			*/
39
40			#include "libavutil/avassert.h"
41			#include "avcodec.h"
42			#include "internal.h"
43			#include "libavutil/common.h"
44
45			/** decoder context */
46			typedef struct EightSvxContext {
47			uint8_t fib_acc[2];
48			const int8_t *table;
49
50			/* buffer used to store the whole first packet.
51			data is only sent as one large packet */
52			uint8_t *data[2];
53			int data_size;
54			int data_idx;
55			} EightSvxContext;
56
57			static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 };
58			static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 };
59
60			#define MAX_FRAME_SIZE 2048
61
62			/**
63			* Delta decode the compressed values in src, and put the resulting
64			* decoded samples in dst.
65			*
66			* @param[in,out] state starting value. it is saved for use in the next call.
67			* @param table delta sequence table
68			*/
69		40	static void delta_decode(uint8_t dst, const uint8_t src, int src_size,
70			uint8_t state, const int8_t table)
71			{
72		40	uint8_t val = *state;
73
74	✓✓	80168	while (src_size--) {
75		80128	uint8_t d = *src++;
76		80128	val = av_clip_uint8(val + table[d & 0xF]);
77		80128	*dst++ = val;
78		80128	val = av_clip_uint8(val + table[d >> 4]);
79		80128	*dst++ = val;
80			}
81
82		40	*state = val;
83		40	}
84
85			/** decode a frame */
86		40	static int eightsvx_decode_frame(AVCodecContext avctx, void data,
87			int got_frame_ptr, AVPacket avpkt)
88			{
89		40	EightSvxContext *esc = avctx->priv_data;
90		40	AVFrame *frame = data;
91			int buf_size;
92			int ch, ret;
93		40	int hdr_size = 2;
94
95			/* decode and interleave the first packet */
96	✓✓✓✗	40	if (!esc->data[0] && avpkt) {
97		1	int chan_size = avpkt->size / avctx->channels - hdr_size;
98
99	✗✓	1	if (avpkt->size % avctx->channels) {
100			av_log(avctx, AV_LOG_WARNING, "Packet with odd size, ignoring last byte\n");
101			}
102	✗✓	1	if (avpkt->size < (hdr_size + 1) * avctx->channels) {
103			av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
104			return AVERROR_INVALIDDATA;
105			}
106
107		1	esc->fib_acc[0] = avpkt->data[1] + 128;
108	✗✓	1	if (avctx->channels == 2)
109			esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128;
110
111		1	esc->data_idx = 0;
112		1	esc->data_size = chan_size;
113	✗✓	1	if (!(esc->data[0] = av_malloc(chan_size)))
114			return AVERROR(ENOMEM);
115	✗✓	1	if (avctx->channels == 2) {
116			if (!(esc->data[1] = av_malloc(chan_size))) {
117			av_freep(&esc->data[0]);
118			return AVERROR(ENOMEM);
119			}
120			}
121		1	memcpy(esc->data[0], &avpkt->data[hdr_size], chan_size);
122	✗✓	1	if (avctx->channels == 2)
123			memcpy(esc->data[1], &avpkt->data[2*hdr_size+chan_size], chan_size);
124			}
125	✗✓	40	if (!esc->data[0]) {
126			av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n");
127			return AVERROR_INVALIDDATA;
128			}
129
130			/* decode next piece of data from the buffer */
131		40	buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx);
132	✗✓	40	if (buf_size <= 0) {
133			*got_frame_ptr = 0;
134			return avpkt->size;
135			}
136
137			/* get output buffer */
138		40	frame->nb_samples = buf_size * 2;
139	✗✓	40	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
140			return ret;
141
142	✓✓	80	for (ch = 0; ch < avctx->channels; ch++) {
143		40	delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx],
144			buf_size, &esc->fib_acc[ch], esc->table);
145			}
146
147		40	esc->data_idx += buf_size;
148
149		40	*got_frame_ptr = 1;
150
151		40	return ((avctx->frame_number == 0)hdr_size + buf_size)avctx->channels;
152			}
153
154		2	static av_cold int eightsvx_decode_init(AVCodecContext *avctx)
155			{
156		2	EightSvxContext *esc = avctx->priv_data;
157
158	✓✗✗✓	2	if (avctx->channels < 1 \|\| avctx->channels > 2) {
159			av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n");
160			return AVERROR_INVALIDDATA;
161			}
162
163	✓✗✗	2	switch (avctx->codec->id) {
164		2	case AV_CODEC_ID_8SVX_FIB: esc->table = fibonacci; break;
165			case AV_CODEC_ID_8SVX_EXP: esc->table = exponential; break;
166			default:
167			av_log(avctx, AV_LOG_ERROR, "Invalid codec id %d.\n", avctx->codec->id);
168			return AVERROR_INVALIDDATA;
169			}
170		2	avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
171
172		2	return 0;
173			}
174
175		2	static av_cold int eightsvx_decode_close(AVCodecContext *avctx)
176			{
177		2	EightSvxContext *esc = avctx->priv_data;
178
179		2	av_freep(&esc->data[0]);
180		2	av_freep(&esc->data[1]);
181		2	esc->data_size = 0;
182		2	esc->data_idx = 0;
183
184		2	return 0;
185			}
186
187			#if CONFIG_EIGHTSVX_FIB_DECODER
188			AVCodec ff_eightsvx_fib_decoder = {
189			.name = "8svx_fib",
190			.long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
191			.type = AVMEDIA_TYPE_AUDIO,
192			.id = AV_CODEC_ID_8SVX_FIB,
193			.priv_data_size = sizeof (EightSvxContext),
194			.init = eightsvx_decode_init,
195			.decode = eightsvx_decode_frame,
196			.close = eightsvx_decode_close,
197			.capabilities = AV_CODEC_CAP_DR1,
198			.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
199			AV_SAMPLE_FMT_NONE },
200			};
201			#endif
202			#if CONFIG_EIGHTSVX_EXP_DECODER
203			AVCodec ff_eightsvx_exp_decoder = {
204			.name = "8svx_exp",
205			.long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"),
206			.type = AVMEDIA_TYPE_AUDIO,
207			.id = AV_CODEC_ID_8SVX_EXP,
208			.priv_data_size = sizeof (EightSvxContext),
209			.init = eightsvx_decode_init,
210			.decode = eightsvx_decode_frame,
211			.close = eightsvx_decode_close,
212			.capabilities = AV_CODEC_CAP_DR1,
213			.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
214			AV_SAMPLE_FMT_NONE },
215			};
216			#endif