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 "avcodec.h" |
32 |
|
|
#include "get_bits.h" |
33 |
|
|
#include "internal.h" |
34 |
|
|
#include "mpegaudiodsp.h" |
35 |
|
|
|
36 |
|
|
#include "mpc.h" |
37 |
|
|
#include "mpc7data.h" |
38 |
|
|
|
39 |
|
|
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
40 |
|
|
|
41 |
|
|
static const uint16_t quant_sizes[MPC7_QUANT_VLC_TABLES*2] = |
42 |
|
|
{ |
43 |
|
|
512, 512, 512, 516, 512, 512, 512, 512, 512, 512, 512, 528, 512, 548 |
44 |
|
|
}; |
45 |
|
|
|
46 |
|
|
|
47 |
|
3 |
static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
48 |
|
|
{ |
49 |
|
|
int i, j; |
50 |
|
3 |
MPCContext *c = avctx->priv_data; |
51 |
|
|
GetBitContext gb; |
52 |
|
3 |
LOCAL_ALIGNED_16(uint8_t, buf, [16]); |
53 |
|
|
static int vlc_initialized = 0; |
54 |
|
|
|
55 |
|
|
static VLC_TYPE quant_tables[7224][2]; |
56 |
|
3 |
VLC_TYPE (*quant_table)[2] = quant_tables; |
57 |
|
3 |
const uint16_t *raw_quant_table = mpc7_quant_vlcs; |
58 |
|
|
|
59 |
|
|
/* Musepack SV7 is always stereo */ |
60 |
✗✓ |
3 |
if (avctx->channels != 2) { |
61 |
|
|
avpriv_request_sample(avctx, "%d channels", avctx->channels); |
62 |
|
|
return AVERROR_PATCHWELCOME; |
63 |
|
|
} |
64 |
|
|
|
65 |
✗✓ |
3 |
if(avctx->extradata_size < 16){ |
66 |
|
|
av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
67 |
|
|
return AVERROR_INVALIDDATA; |
68 |
|
|
} |
69 |
|
3 |
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
70 |
|
3 |
av_lfg_init(&c->rnd, 0xDEADBEEF); |
71 |
|
3 |
ff_bswapdsp_init(&c->bdsp); |
72 |
|
3 |
ff_mpadsp_init(&c->mpadsp); |
73 |
|
3 |
c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4); |
74 |
|
3 |
ff_mpc_init(); |
75 |
|
3 |
init_get_bits(&gb, buf, 128); |
76 |
|
|
|
77 |
|
3 |
c->IS = get_bits1(&gb); |
78 |
|
3 |
c->MSS = get_bits1(&gb); |
79 |
|
3 |
c->maxbands = get_bits(&gb, 6); |
80 |
✗✓ |
3 |
if(c->maxbands >= BANDS){ |
81 |
|
|
av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); |
82 |
|
|
return AVERROR_INVALIDDATA; |
83 |
|
|
} |
84 |
|
3 |
skip_bits_long(&gb, 88); |
85 |
|
3 |
c->gapless = get_bits1(&gb); |
86 |
|
3 |
c->lastframelen = get_bits(&gb, 11); |
87 |
|
3 |
av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", |
88 |
|
|
c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); |
89 |
|
3 |
c->frames_to_skip = 0; |
90 |
|
|
|
91 |
|
3 |
avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
92 |
|
3 |
avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
93 |
|
|
|
94 |
✓✓ |
3 |
if(vlc_initialized) return 0; |
95 |
|
2 |
av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
96 |
|
2 |
INIT_VLC_STATIC(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
97 |
|
|
&mpc7_scfi[1], 2, 1, |
98 |
|
|
&mpc7_scfi[0], 2, 1, 1 << MPC7_SCFI_BITS); |
99 |
|
2 |
INIT_VLC_STATIC(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
100 |
|
|
&mpc7_dscf[1], 2, 1, |
101 |
|
|
&mpc7_dscf[0], 2, 1, 1 << MPC7_DSCF_BITS); |
102 |
|
2 |
INIT_VLC_STATIC(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
103 |
|
|
&mpc7_hdr[1], 2, 1, |
104 |
|
|
&mpc7_hdr[0], 2, 1, 1 << MPC7_HDR_BITS); |
105 |
✓✓ |
16 |
for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
106 |
✓✓ |
42 |
for(j = 0; j < 2; j++){ |
107 |
|
28 |
quant_vlc[i][j].table = quant_table; |
108 |
|
28 |
quant_vlc[i][j].table_allocated = quant_sizes[i * 2 + j]; |
109 |
|
28 |
quant_table += quant_sizes[i * 2 + j]; |
110 |
|
28 |
init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
111 |
|
|
raw_quant_table + 1, 4, 2, |
112 |
|
|
raw_quant_table, 4, 2, INIT_VLC_USE_NEW_STATIC); |
113 |
|
28 |
raw_quant_table += 2 * mpc7_quant_vlc_sizes[i]; |
114 |
|
|
} |
115 |
|
|
} |
116 |
|
2 |
vlc_initialized = 1; |
117 |
|
|
|
118 |
|
2 |
return 0; |
119 |
|
|
} |
120 |
|
|
|
121 |
|
|
/** |
122 |
|
|
* Fill samples for given subband |
123 |
|
|
*/ |
124 |
|
29184 |
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
125 |
|
|
{ |
126 |
|
|
int i, i1, t; |
127 |
✗✓✓✓
✓✓ |
29184 |
switch(idx){ |
128 |
|
|
case -1: |
129 |
|
|
for(i = 0; i < SAMPLES_PER_BAND; i++){ |
130 |
|
|
*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
131 |
|
|
} |
132 |
|
|
break; |
133 |
|
3499 |
case 1: |
134 |
|
3499 |
i1 = get_bits1(gb); |
135 |
✓✓ |
45487 |
for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
136 |
|
41988 |
t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
137 |
|
41988 |
*dst++ = mpc7_idx30[t]; |
138 |
|
41988 |
*dst++ = mpc7_idx31[t]; |
139 |
|
41988 |
*dst++ = mpc7_idx32[t]; |
140 |
|
|
} |
141 |
|
3499 |
break; |
142 |
|
6128 |
case 2: |
143 |
|
6128 |
i1 = get_bits1(gb); |
144 |
✓✓ |
116432 |
for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
145 |
|
110304 |
t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
146 |
|
110304 |
*dst++ = mpc7_idx50[t]; |
147 |
|
110304 |
*dst++ = mpc7_idx51[t]; |
148 |
|
|
} |
149 |
|
6128 |
break; |
150 |
|
7935 |
case 3: case 4: case 5: case 6: case 7: |
151 |
|
7935 |
i1 = get_bits1(gb); |
152 |
✓✓ |
293595 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
153 |
|
285660 |
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
154 |
|
7935 |
break; |
155 |
|
720 |
case 8: case 9: case 10: case 11: case 12: |
156 |
|
|
case 13: case 14: case 15: case 16: case 17: |
157 |
|
720 |
t = (1 << (idx - 2)) - 1; |
158 |
✓✓ |
26640 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
159 |
|
25920 |
*dst++ = get_bits(gb, idx - 1) - t; |
160 |
|
720 |
break; |
161 |
|
10902 |
default: // case 0 and -2..-17 |
162 |
|
10902 |
return; |
163 |
|
|
} |
164 |
|
|
} |
165 |
|
|
|
166 |
|
31340 |
static int get_scale_idx(GetBitContext *gb, int ref) |
167 |
|
|
{ |
168 |
|
31340 |
int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
169 |
✓✓ |
31340 |
if (t == 8) |
170 |
|
3784 |
return get_bits(gb, 6); |
171 |
|
27556 |
return ref + t; |
172 |
|
|
} |
173 |
|
|
|
174 |
|
456 |
static int mpc7_decode_frame(AVCodecContext * avctx, void *data, |
175 |
|
|
int *got_frame_ptr, AVPacket *avpkt) |
176 |
|
|
{ |
177 |
|
456 |
AVFrame *frame = data; |
178 |
|
456 |
const uint8_t *buf = avpkt->data; |
179 |
|
|
int buf_size; |
180 |
|
456 |
MPCContext *c = avctx->priv_data; |
181 |
|
|
GetBitContext gb; |
182 |
|
|
int i, ch; |
183 |
|
456 |
int mb = -1; |
184 |
|
456 |
Band *bands = c->bands; |
185 |
|
|
int off, ret, last_frame, skip; |
186 |
|
|
int bits_used, bits_avail; |
187 |
|
|
|
188 |
|
456 |
memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); |
189 |
|
|
|
190 |
|
456 |
buf_size = avpkt->size & ~3; |
191 |
✗✓ |
456 |
if (buf_size <= 0) { |
192 |
|
|
av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", |
193 |
|
|
avpkt->size); |
194 |
|
|
return AVERROR_INVALIDDATA; |
195 |
|
|
} |
196 |
✗✓ |
456 |
if (buf_size != avpkt->size) { |
197 |
|
|
av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " |
198 |
|
|
"extra bytes at the end will be skipped.\n"); |
199 |
|
|
} |
200 |
|
|
|
201 |
|
456 |
skip = buf[0]; |
202 |
|
456 |
last_frame = buf[1]; |
203 |
|
456 |
buf += 4; |
204 |
|
456 |
buf_size -= 4; |
205 |
|
|
|
206 |
|
|
/* get output buffer */ |
207 |
|
456 |
frame->nb_samples = MPC_FRAME_SIZE; |
208 |
✗✓ |
456 |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
209 |
|
|
return ret; |
210 |
|
|
|
211 |
|
456 |
av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); |
212 |
✗✓ |
456 |
if (!c->bits) |
213 |
|
|
return AVERROR(ENOMEM); |
214 |
|
456 |
c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, |
215 |
|
|
buf_size >> 2); |
216 |
✗✓ |
456 |
if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0) |
217 |
|
|
return ret; |
218 |
|
456 |
skip_bits_long(&gb, skip); |
219 |
|
|
|
220 |
|
|
/* read subband indexes */ |
221 |
✓✓ |
13680 |
for(i = 0; i <= c->maxbands; i++){ |
222 |
✓✓ |
39672 |
for(ch = 0; ch < 2; ch++){ |
223 |
|
26448 |
int t = 4; |
224 |
✓✓ |
26448 |
if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
225 |
✓✓ |
26448 |
if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); |
226 |
|
25465 |
else bands[i].res[ch] = bands[i-1].res[ch] + t; |
227 |
✓✗✗✓
|
26448 |
if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) { |
228 |
|
|
av_log(avctx, AV_LOG_ERROR, "subband index invalid\n"); |
229 |
|
|
return AVERROR_INVALIDDATA; |
230 |
|
|
} |
231 |
|
|
} |
232 |
|
|
|
233 |
✓✓✓✓
|
13224 |
if(bands[i].res[0] || bands[i].res[1]){ |
234 |
|
10414 |
mb = i; |
235 |
✓✗ |
10414 |
if(c->MSS) bands[i].msf = get_bits1(&gb); |
236 |
|
|
} |
237 |
|
|
} |
238 |
|
|
/* get scale indexes coding method */ |
239 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++) |
240 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++) |
241 |
✓✓ |
20828 |
if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); |
242 |
|
|
/* get scale indexes */ |
243 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++){ |
244 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++){ |
245 |
✓✓ |
20828 |
if(bands[i].res[ch]){ |
246 |
|
18282 |
bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; |
247 |
|
18282 |
bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); |
248 |
✓✓✓✓
✗ |
18282 |
switch(bands[i].scfi[ch]){ |
249 |
|
1558 |
case 0: |
250 |
|
1558 |
bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
251 |
|
1558 |
bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
252 |
|
1558 |
break; |
253 |
|
2381 |
case 1: |
254 |
|
2381 |
bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
255 |
|
2381 |
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; |
256 |
|
2381 |
break; |
257 |
|
7561 |
case 2: |
258 |
|
7561 |
bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
259 |
|
7561 |
bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
260 |
|
7561 |
break; |
261 |
|
6782 |
case 3: |
262 |
|
6782 |
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
263 |
|
6782 |
break; |
264 |
|
|
} |
265 |
|
18282 |
c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; |
266 |
|
|
} |
267 |
|
|
} |
268 |
|
|
} |
269 |
|
|
/* get quantizers */ |
270 |
|
456 |
memset(c->Q, 0, sizeof(c->Q)); |
271 |
|
456 |
off = 0; |
272 |
✓✓ |
15048 |
for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
273 |
✓✓ |
43776 |
for(ch = 0; ch < 2; ch++) |
274 |
|
29184 |
idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); |
275 |
|
|
|
276 |
|
456 |
ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2); |
277 |
✗✓ |
456 |
if(last_frame) |
278 |
|
|
frame->nb_samples = c->lastframelen; |
279 |
|
|
|
280 |
|
456 |
bits_used = get_bits_count(&gb); |
281 |
|
456 |
bits_avail = buf_size * 8; |
282 |
✓✗✓✗
✗✓ |
456 |
if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) { |
283 |
|
|
av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); |
284 |
|
|
return AVERROR_INVALIDDATA; |
285 |
|
|
} |
286 |
✗✓ |
456 |
if(c->frames_to_skip){ |
287 |
|
|
c->frames_to_skip--; |
288 |
|
|
*got_frame_ptr = 0; |
289 |
|
|
return avpkt->size; |
290 |
|
|
} |
291 |
|
|
|
292 |
|
456 |
*got_frame_ptr = 1; |
293 |
|
|
|
294 |
|
456 |
return avpkt->size; |
295 |
|
|
} |
296 |
|
|
|
297 |
|
|
static void mpc7_decode_flush(AVCodecContext *avctx) |
298 |
|
|
{ |
299 |
|
|
MPCContext *c = avctx->priv_data; |
300 |
|
|
|
301 |
|
|
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
302 |
|
|
c->frames_to_skip = 32; |
303 |
|
|
} |
304 |
|
|
|
305 |
|
3 |
static av_cold int mpc7_decode_close(AVCodecContext *avctx) |
306 |
|
|
{ |
307 |
|
3 |
MPCContext *c = avctx->priv_data; |
308 |
|
3 |
av_freep(&c->bits); |
309 |
|
3 |
c->buf_size = 0; |
310 |
|
3 |
return 0; |
311 |
|
|
} |
312 |
|
|
|
313 |
|
|
AVCodec ff_mpc7_decoder = { |
314 |
|
|
.name = "mpc7", |
315 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
316 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
317 |
|
|
.id = AV_CODEC_ID_MUSEPACK7, |
318 |
|
|
.priv_data_size = sizeof(MPCContext), |
319 |
|
|
.init = mpc7_decode_init, |
320 |
|
|
.close = mpc7_decode_close, |
321 |
|
|
.decode = mpc7_decode_frame, |
322 |
|
|
.flush = mpc7_decode_flush, |
323 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
324 |
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
325 |
|
|
AV_SAMPLE_FMT_NONE }, |
326 |
|
|
}; |