FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpc7.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 147 175 84.0%
Branches: 67 87 77.0%

Line Branch Exec Source
1 /*
2 * Musepack SV7 decoder
3 * Copyright (c) 2006 Konstantin Shishkov
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 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
26 */
27
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/lfg.h"
31 #include "libavutil/mem_internal.h"
32 #include "libavutil/thread.h"
33
34 #include "avcodec.h"
35 #include "get_bits.h"
36 #include "internal.h"
37 #include "mpegaudiodsp.h"
38
39 #include "mpc.h"
40 #include "mpc7data.h"
41
42 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
43
44 2 static av_cold void mpc7_init_static(void)
45 {
46 static VLC_TYPE quant_tables[7224][2];
47 2 const uint8_t *raw_quant_table = mpc7_quant_vlcs;
48
49 2 INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
50 &mpc7_scfi[1], 2,
51 &mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
52 2 INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
53 &mpc7_dscf[1], 2,
54 &mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
55 2 INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
56 &mpc7_hdr[1], 2,
57 &mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
58
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16 for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
59
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42 for (int j = 0; j < 2; j++) {
60 28 quant_vlc[i][j].table = &quant_tables[offset];
61 28 quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
62 28 ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
63 28 &raw_quant_table[1], 2,
64 &raw_quant_table[0], 2, 1,
65 28 mpc7_quant_vlc_off[i],
66 INIT_VLC_STATIC_OVERLONG, NULL);
67 28 raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
68 28 offset += quant_vlc[i][j].table_size;
69 }
70 }
71 2 ff_mpa_synth_init_fixed();
72 2 }
73
74 3 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
75 {
76 static AVOnce init_static_once = AV_ONCE_INIT;
77 3 MPCContext *c = avctx->priv_data;
78 GetBitContext gb;
79 3 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
80
81 /* Musepack SV7 is always stereo */
82
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3 if (avctx->channels != 2) {
83 avpriv_request_sample(avctx, "%d channels", avctx->channels);
84 return AVERROR_PATCHWELCOME;
85 }
86
87
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3 if(avctx->extradata_size < 16){
88 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
89 return AVERROR_INVALIDDATA;
90 }
91 3 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
92 3 av_lfg_init(&c->rnd, 0xDEADBEEF);
93 3 ff_bswapdsp_init(&c->bdsp);
94 3 ff_mpadsp_init(&c->mpadsp);
95 3 c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
96 3 init_get_bits(&gb, buf, 128);
97
98 3 c->IS = get_bits1(&gb);
99 3 c->MSS = get_bits1(&gb);
100 3 c->maxbands = get_bits(&gb, 6);
101
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3 if(c->maxbands >= BANDS){
102 av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
103 return AVERROR_INVALIDDATA;
104 }
105 3 skip_bits_long(&gb, 88);
106 3 c->gapless = get_bits1(&gb);
107 3 c->lastframelen = get_bits(&gb, 11);
108 3 av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
109 c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
110 3 c->frames_to_skip = 0;
111
112 3 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
113 3 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
114
115 3 ff_thread_once(&init_static_once, mpc7_init_static);
116
117 3 return 0;
118 }
119
120 /**
121 * Fill samples for given subband
122 */
123 29184 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
124 {
125 int i, i1, t;
126
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29184 switch(idx){
127 case -1:
128 for(i = 0; i < SAMPLES_PER_BAND; i++){
129 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
130 }
131 break;
132 3499 case 1:
133 3499 i1 = get_bits1(gb);
134
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45487 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
135 41988 t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
136 41988 *dst++ = mpc7_idx30[t];
137 41988 *dst++ = mpc7_idx31[t];
138 41988 *dst++ = mpc7_idx32[t];
139 }
140 3499 break;
141 6128 case 2:
142 6128 i1 = get_bits1(gb);
143
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116432 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
144 110304 t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
145 110304 *dst++ = mpc7_idx50[t];
146 110304 *dst++ = mpc7_idx51[t];
147 }
148 6128 break;
149 7935 case 3: case 4: case 5: case 6: case 7:
150 7935 i1 = get_bits1(gb);
151
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293595 for(i = 0; i < SAMPLES_PER_BAND; i++)
152 285660 *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2);
153 7935 break;
154 720 case 8: case 9: case 10: case 11: case 12:
155 case 13: case 14: case 15: case 16: case 17:
156 720 t = (1 << (idx - 2)) - 1;
157
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26640 for(i = 0; i < SAMPLES_PER_BAND; i++)
158 25920 *dst++ = get_bits(gb, idx - 1) - t;
159 720 break;
160 10902 default: // case 0 and -2..-17
161 10902 return;
162 }
163 }
164
165 31340 static int get_scale_idx(GetBitContext *gb, int ref)
166 {
167 31340 int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1);
168
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31340 if (t == 8)
169 3784 return get_bits(gb, 6);
170 27556 return ref + t;
171 }
172
173 456 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
174 int *got_frame_ptr, AVPacket *avpkt)
175 {
176 456 AVFrame *frame = data;
177 456 const uint8_t *buf = avpkt->data;
178 int buf_size;
179 456 MPCContext *c = avctx->priv_data;
180 GetBitContext gb;
181 int i, ch;
182 456 int mb = -1;
183 456 Band *bands = c->bands;
184 int off, ret, last_frame, skip;
185 int bits_used, bits_avail;
186
187 456 memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
188
189 456 buf_size = avpkt->size & ~3;
190
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456 if (buf_size <= 0) {
191 av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
192 avpkt->size);
193 return AVERROR_INVALIDDATA;
194 }
195
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456 if (buf_size != avpkt->size) {
196 av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
197 "extra bytes at the end will be skipped.\n");
198 }
199
200 456 skip = buf[0];
201 456 last_frame = buf[1];
202 456 buf += 4;
203 456 buf_size -= 4;
204
205 /* get output buffer */
206 456 frame->nb_samples = MPC_FRAME_SIZE;
207
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456 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
208 return ret;
209
210 456 av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
211
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456 if (!c->bits)
212 return AVERROR(ENOMEM);
213 456 c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
214 buf_size >> 2);
215
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456 if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
216 return ret;
217 456 skip_bits_long(&gb, skip);
218
219 /* read subband indexes */
220
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13680 for(i = 0; i <= c->maxbands; i++){
221
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39672 for(ch = 0; ch < 2; ch++){
222
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26448 int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4;
223
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26448 if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
224 25465 else bands[i].res[ch] = bands[i-1].res[ch] + t;
225
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26448 if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
226 av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
227 return AVERROR_INVALIDDATA;
228 }
229 }
230
231
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13224 if(bands[i].res[0] || bands[i].res[1]){
232 10414 mb = i;
233
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10414 if(c->MSS) bands[i].msf = get_bits1(&gb);
234 }
235 }
236 /* get scale indexes coding method */
237
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10870 for(i = 0; i <= mb; i++)
238
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31242 for(ch = 0; ch < 2; ch++)
239
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20828 if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
240 /* get scale indexes */
241
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242
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243
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20828 if(bands[i].res[ch]){
244 18282 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
245 18282 bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
246
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18282 switch(bands[i].scfi[ch]){
247 1558 case 0:
248 1558 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
249 1558 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
250 1558 break;
251 2381 case 1:
252 2381 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
253 2381 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
254 2381 break;
255 7561 case 2:
256 7561 bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
257 7561 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
258 7561 break;
259 6782 case 3:
260 6782 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
261 6782 break;
262 }
263 18282 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
264 }
265 }
266 }
267 /* get quantizers */
268 456 memset(c->Q, 0, sizeof(c->Q));
269 456 off = 0;
270
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15048 for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
271
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43776 for(ch = 0; ch < 2; ch++)
272 29184 idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
273
274 456 ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
275
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456 if(last_frame)
276 frame->nb_samples = c->lastframelen;
277
278 456 bits_used = get_bits_count(&gb);
279 456 bits_avail = buf_size * 8;
280
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456 if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
281 av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
282 return AVERROR_INVALIDDATA;
283 }
284
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456 if(c->frames_to_skip){
285 c->frames_to_skip--;
286 *got_frame_ptr = 0;
287 return avpkt->size;
288 }
289
290 456 *got_frame_ptr = 1;
291
292 456 return avpkt->size;
293 }
294
295 static void mpc7_decode_flush(AVCodecContext *avctx)
296 {
297 MPCContext *c = avctx->priv_data;
298
299 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
300 c->frames_to_skip = 32;
301 }
302
303 3 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
304 {
305 3 MPCContext *c = avctx->priv_data;
306 3 av_freep(&c->bits);
307 3 c->buf_size = 0;
308 3 return 0;
309 }
310
311 const AVCodec ff_mpc7_decoder = {
312 .name = "mpc7",
313 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
314 .type = AVMEDIA_TYPE_AUDIO,
315 .id = AV_CODEC_ID_MUSEPACK7,
316 .priv_data_size = sizeof(MPCContext),
317 .init = mpc7_decode_init,
318 .close = mpc7_decode_close,
319 .decode = mpc7_decode_frame,
320 .flush = mpc7_decode_flush,
321 .capabilities = AV_CODEC_CAP_DR1,
322 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
323 AV_SAMPLE_FMT_NONE },
324 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
325 };
326