FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/nellymoserdec.c
Date: 2025-10-26 07:25:09
Exec Total Coverage
Lines: 67 73 91.8%
Functions: 4 4 100.0%
Branches: 21 26 80.8%
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1 /*
2 * NellyMoser audio decoder
3 * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
4 * 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
5 * 520e17cd55896441042b14df2566a6eb610ed444
6 * Copyright (c) 2007 Loic Minier <lool at dooz.org>
7 * Benjamin Larsson
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 /**
29 * @file
30 * The 3 alphanumeric copyright notices are md5summed they are from the original
31 * implementers. The original code is available from http://code.google.com/p/nelly2pcm/
32 */
33
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/float_dsp.h"
36 #include "libavutil/lfg.h"
37 #include "libavutil/mem.h"
38 #include "libavutil/mem_internal.h"
39 #include "libavutil/tx.h"
40
41 #define BITSTREAM_READER_LE
42 #include "avcodec.h"
43 #include "codec_internal.h"
44 #include "decode.h"
45 #include "get_bits.h"
46 #include "nellymoser.h"
47 #include "sinewin.h"
48
49
50 typedef struct NellyMoserDecodeContext {
51 AVCodecContext* avctx;
52 AVLFG random_state;
53 GetBitContext gb;
54 float scale_bias;
55 AVFloatDSPContext *fdsp;
56 AVTXContext *imdct_ctx;
57 av_tx_fn imdct_fn;
58 DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
59 float *imdct_out;
60 float *imdct_prev;
61 } NellyMoserDecodeContext;
62
63 2805 static void nelly_decode_block(NellyMoserDecodeContext *s,
64 const unsigned char block[NELLY_BLOCK_LEN],
65 float audio[NELLY_SAMPLES])
66 {
67 int i,j;
68 float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
69 float *aptr, *bptr, *pptr, val, pval;
70 int bits[NELLY_BUF_LEN];
71 unsigned char v;
72
73 2805 init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
74
75 2805 bptr = buf;
76 2805 pptr = pows;
77 2805 val = ff_nelly_init_table[get_bits(&s->gb, 6)];
78
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 67320 for (i=0 ; i<NELLY_BANDS ; i++) {
79
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 64515 if (i > 0)
80 61710 val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
81 64515 pval = -exp2(val/2048) * s->scale_bias;
82
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 412335 for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
83 347820 *bptr++ = val;
84 347820 *pptr++ = pval;
85 }
86
87 }
88
89 2805 ff_nelly_get_sample_bits(buf, bits);
90
91
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 8415 for (i = 0; i < 2; i++) {
92 5610 aptr = audio + i * NELLY_BUF_LEN;
93
94 5610 init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
95 5610 skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
96
97
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 701250 for (j = 0; j < NELLY_FILL_LEN; j++) {
98
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 695640 if (bits[j] <= 0) {
99 193626 aptr[j] = M_SQRT1_2*pows[j];
100
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 193626 if (av_lfg_get(&s->random_state) & 1)
101 97008 aptr[j] *= -1.0;
102 } else {
103 502014 v = get_bits(&s->gb, bits[j]);
104 502014 aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
105 }
106 }
107 5610 memset(&aptr[NELLY_FILL_LEN], 0,
108 (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
109
110 5610 s->imdct_fn(s->imdct_ctx, s->imdct_out, aptr, sizeof(float));
111 5610 s->fdsp->vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2,
112 5610 s->imdct_out, ff_sine_128,
113 NELLY_BUF_LEN / 2);
114 5610 FFSWAP(float *, s->imdct_out, s->imdct_prev);
115 }
116 2805 }
117
118 6 static av_cold int decode_init(AVCodecContext * avctx)
119 {
120 int ret;
121 6 float scale = 1.0f;
122 6 NellyMoserDecodeContext *s = avctx->priv_data;
123
124 6 s->avctx = avctx;
125 6 s->imdct_out = s->imdct_buf[0];
126 6 s->imdct_prev = s->imdct_buf[1];
127 6 av_lfg_init(&s->random_state, 0);
128
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 6 if ((ret = av_tx_init(&s->imdct_ctx, &s->imdct_fn, AV_TX_FLOAT_MDCT,
129 1, 128, &scale, 0)) < 0)
130 ✗ return ret;
131
132 6 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
133
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 6 if (!s->fdsp)
134 ✗ return AVERROR(ENOMEM);
135
136 6 s->scale_bias = 1.0/(32768*8);
137 6 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
138
139 6 av_channel_layout_uninit(&avctx->ch_layout);
140 6 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
141
142 /* Generate overlap window */
143 6 ff_init_ff_sine_windows(7);
144
145 6 return 0;
146 }
147
148 1701 static int decode_tag(AVCodecContext *avctx, AVFrame *frame,
149 int *got_frame_ptr, AVPacket *avpkt)
150 {
151 1701 const uint8_t *buf = avpkt->data;
152 1701 int buf_size = avpkt->size;
153 1701 NellyMoserDecodeContext *s = avctx->priv_data;
154 int blocks, i, ret;
155 float *samples_flt;
156
157 1701 blocks = buf_size / NELLY_BLOCK_LEN;
158
159
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 1701 if (blocks <= 0) {
160 ✗ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
161 ✗ return AVERROR_INVALIDDATA;
162 }
163
164
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 1701 if (buf_size % NELLY_BLOCK_LEN) {
165 ✗ av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n",
166 buf_size % NELLY_BLOCK_LEN);
167 }
168
169 /* get output buffer */
170 1701 frame->nb_samples = NELLY_SAMPLES * blocks;
171
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 1701 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
172 ✗ return ret;
173 1701 samples_flt = (float *)frame->data[0];
174
175
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 4506 for (i=0 ; i<blocks ; i++) {
176 2805 nelly_decode_block(s, buf, samples_flt);
177 2805 samples_flt += NELLY_SAMPLES;
178 2805 buf += NELLY_BLOCK_LEN;
179 }
180
181 1701 *got_frame_ptr = 1;
182
183 1701 return buf_size;
184 }
185
186 6 static av_cold int decode_end(AVCodecContext * avctx) {
187 6 NellyMoserDecodeContext *s = avctx->priv_data;
188
189 6 av_tx_uninit(&s->imdct_ctx);
190 6 av_freep(&s->fdsp);
191
192 6 return 0;
193 }
194
195 const FFCodec ff_nellymoser_decoder = {
196 .p.name = "nellymoser",
197 CODEC_LONG_NAME("Nellymoser Asao"),
198 .p.type = AVMEDIA_TYPE_AUDIO,
199 .p.id = AV_CODEC_ID_NELLYMOSER,
200 .priv_data_size = sizeof(NellyMoserDecodeContext),
201 .init = decode_init,
202 .close = decode_end,
203 FF_CODEC_DECODE_CB(decode_tag),
204 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE | AV_CODEC_CAP_CHANNEL_CONF,
205 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLT),
206 };
207