FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/adxdec.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 52 86 60.5%
Branches: 19 48 39.6%
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 "libavutil/intreadwrite.h"
23 #include "avcodec.h"
24 #include "adx.h"
25 #include "codec_internal.h"
26 #include "get_bits.h"
27 #include "internal.h"
28
29 /**
30 * @file
31 * SEGA CRI adx codecs.
32 *
33 * Reference documents:
34 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
35 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
36 */
37
38 2 static av_cold int adx_decode_init(AVCodecContext *avctx)
39 {
40 2 ADXContext *c = avctx->priv_data;
41 int ret, header_size;
42
43
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 if (avctx->extradata_size >= 24) {
44
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if ((ret = ff_adx_decode_header(avctx, avctx->extradata,
45 avctx->extradata_size, &header_size,
46 2 c->coeff)) < 0) {
47 ✗ av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
48 ✗ return AVERROR_INVALIDDATA;
49 }
50 2 c->channels = avctx->ch_layout.nb_channels;
51 2 c->header_parsed = 1;
52 }
53
54 2 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
55
56 2 return 0;
57 }
58
59 /**
60 * Decode 32 samples from 18 bytes.
61 *
62 * A 16-bit scalar value is applied to 32 residuals, which then have a
63 * 2nd-order LPC filter applied to it to form the output signal for a single
64 * channel.
65 */
66 16794 static int adx_decode(ADXContext *c, int16_t *out, int offset,
67 const uint8_t *in, int ch)
68 {
69 16794 ADXChannelState *prev = &c->prev[ch];
70 GetBitContext gb;
71 16794 int scale = AV_RB16(in);
72 int i;
73 int s0, s1, s2, d;
74
75 /* check if this is an EOF packet */
76
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 16794 times.
 16794 if (scale & 0x8000)
77 ✗ return -1;
78
79 16794 init_get_bits(&gb, in + 2, (BLOCK_SIZE - 2) * 8);
80 16794 out += offset;
81 16794 s1 = prev->s1;
82 16794 s2 = prev->s2;
83
2/2
✓ Branch 0 taken 537408 times.
✓ Branch 1 taken 16794 times.
 554202 for (i = 0; i < BLOCK_SAMPLES; i++) {
84 537408 d = get_sbits(&gb, 4);
85 537408 s0 = d * scale + ((c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS);
86 537408 s2 = s1;
87 537408 s1 = av_clip_int16(s0);
88 537408 *out++ = s1;
89 }
90 16794 prev->s1 = s1;
91 16794 prev->s2 = s2;
92
93 16794 return 0;
94 }
95
96 66 static int adx_decode_frame(AVCodecContext *avctx, AVFrame *frame,
97 int *got_frame_ptr, AVPacket *avpkt)
98 {
99 66 int buf_size = avpkt->size;
100 66 ADXContext *c = avctx->priv_data;
101 int16_t **samples;
102 int samples_offset;
103 66 const uint8_t *buf = avpkt->data;
104 66 const uint8_t *buf_end = buf + avpkt->size;
105 int num_blocks, ch, ret;
106 size_t new_extradata_size;
107 uint8_t *new_extradata;
108
109 66 new_extradata = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
110 &new_extradata_size);
111
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 66 if (new_extradata && new_extradata_size > 0) {
112 int header_size;
113 ✗ if ((ret = ff_adx_decode_header(avctx, new_extradata,
114 new_extradata_size, &header_size,
115 ✗ c->coeff)) < 0) {
116 ✗ av_log(avctx, AV_LOG_ERROR, "error parsing new ADX extradata\n");
117 ✗ return AVERROR_INVALIDDATA;
118 }
119
120 ✗ c->eof = 0;
121 }
122
123
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (c->eof) {
124 ✗ *got_frame_ptr = 0;
125 ✗ return buf_size;
126 }
127
128
1/6
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
 66 if (!c->header_parsed && buf_size >= 2 && AV_RB16(buf) == 0x8000) {
129 int header_size;
130 ✗ if ((ret = ff_adx_decode_header(avctx, buf, buf_size, &header_size,
131 ✗ c->coeff)) < 0) {
132 ✗ av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
133 ✗ return AVERROR_INVALIDDATA;
134 }
135 ✗ c->channels = avctx->ch_layout.nb_channels;
136 ✗ c->header_parsed = 1;
137 ✗ if (buf_size < header_size)
138 ✗ return AVERROR_INVALIDDATA;
139 ✗ buf += header_size;
140 ✗ buf_size -= header_size;
141 }
142
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (!c->header_parsed)
143 ✗ return AVERROR_INVALIDDATA;
144
145 /* calculate number of blocks in the packet */
146 66 num_blocks = buf_size / (BLOCK_SIZE * c->channels);
147
148 /* if the packet is not an even multiple of BLOCK_SIZE, check for an EOF
149 packet */
150
2/4
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 66 times.
 66 if (!num_blocks || buf_size % (BLOCK_SIZE * c->channels)) {
151 ✗ if (buf_size >= 4 && (AV_RB16(buf) & 0x8000)) {
152 ✗ c->eof = 1;
153 ✗ *got_frame_ptr = 0;
154 ✗ return avpkt->size;
155 }
156 ✗ return AVERROR_INVALIDDATA;
157 }
158
159 /* get output buffer */
160 66 frame->nb_samples = num_blocks * BLOCK_SAMPLES;
161
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 66 times.
 66 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
162 ✗ return ret;
163 66 samples = (int16_t **)frame->extended_data;
164 66 samples_offset = 0;
165
166
2/2
✓ Branch 0 taken 8397 times.
✓ Branch 1 taken 66 times.
 8463 while (num_blocks--) {
167
2/2
✓ Branch 0 taken 16794 times.
✓ Branch 1 taken 8397 times.
 25191 for (ch = 0; ch < c->channels; ch++) {
168
2/4
✓ Branch 0 taken 16794 times.
✗ Branch 1 not taken.
✗ Branch 3 not taken.
✓ Branch 4 taken 16794 times.
 16794 if (buf_end - buf < BLOCK_SIZE || adx_decode(c, samples[ch], samples_offset, buf, ch)) {
169 ✗ c->eof = 1;
170 ✗ buf = avpkt->data + avpkt->size;
171 ✗ break;
172 }
173 16794 buf_size -= BLOCK_SIZE;
174 16794 buf += BLOCK_SIZE;
175 }
176
1/2
✓ Branch 0 taken 8397 times.
✗ Branch 1 not taken.
 8397 if (!c->eof)
177 8397 samples_offset += BLOCK_SAMPLES;
178 }
179
180 66 frame->nb_samples = samples_offset;
181 66 *got_frame_ptr = 1;
182
183 66 return buf - avpkt->data;
184 }
185
186 ✗ static void adx_decode_flush(AVCodecContext *avctx)
187 {
188 ✗ ADXContext *c = avctx->priv_data;
189 ✗ memset(c->prev, 0, sizeof(c->prev));
190 ✗ c->eof = 0;
191 }
192
193 const FFCodec ff_adpcm_adx_decoder = {
194 .p.name = "adpcm_adx",
195 .p.long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
196 .p.type = AVMEDIA_TYPE_AUDIO,
197 .p.id = AV_CODEC_ID_ADPCM_ADX,
198 .priv_data_size = sizeof(ADXContext),
199 .init = adx_decode_init,
200 FF_CODEC_DECODE_CB(adx_decode_frame),
201 .flush = adx_decode_flush,
202 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
203 AV_CODEC_CAP_DR1,
204 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
205 AV_SAMPLE_FMT_NONE },
206 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
207 };
208