Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
6147 | serge | 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_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] = |
||
42 | { |
||
43 | 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124, |
||
44 | 5636, 6164, 6676, 7224 |
||
45 | }; |
||
46 | |||
47 | |||
48 | static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
||
49 | { |
||
50 | int i, j; |
||
51 | MPCContext *c = avctx->priv_data; |
||
52 | GetBitContext gb; |
||
53 | LOCAL_ALIGNED_16(uint8_t, buf, [16]); |
||
54 | static int vlc_initialized = 0; |
||
55 | |||
56 | static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2]; |
||
57 | static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2]; |
||
58 | static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2]; |
||
59 | static VLC_TYPE quant_tables[7224][2]; |
||
60 | |||
61 | /* Musepack SV7 is always stereo */ |
||
62 | if (avctx->channels != 2) { |
||
63 | avpriv_request_sample(avctx, "%d channels", avctx->channels); |
||
64 | return AVERROR_PATCHWELCOME; |
||
65 | } |
||
66 | |||
67 | if(avctx->extradata_size < 16){ |
||
68 | av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
||
69 | return -1; |
||
70 | } |
||
71 | memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
||
72 | av_lfg_init(&c->rnd, 0xDEADBEEF); |
||
73 | ff_bswapdsp_init(&c->bdsp); |
||
74 | ff_mpadsp_init(&c->mpadsp); |
||
75 | c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4); |
||
76 | ff_mpc_init(); |
||
77 | init_get_bits(&gb, buf, 128); |
||
78 | |||
79 | c->IS = get_bits1(&gb); |
||
80 | c->MSS = get_bits1(&gb); |
||
81 | c->maxbands = get_bits(&gb, 6); |
||
82 | if(c->maxbands >= BANDS){ |
||
83 | av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); |
||
84 | return -1; |
||
85 | } |
||
86 | skip_bits_long(&gb, 88); |
||
87 | c->gapless = get_bits1(&gb); |
||
88 | c->lastframelen = get_bits(&gb, 11); |
||
89 | av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", |
||
90 | c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); |
||
91 | c->frames_to_skip = 0; |
||
92 | |||
93 | avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
||
94 | avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
||
95 | |||
96 | if(vlc_initialized) return 0; |
||
97 | av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
||
98 | scfi_vlc.table = scfi_table; |
||
99 | scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS; |
||
100 | if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
||
101 | &mpc7_scfi[1], 2, 1, |
||
102 | &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
||
103 | av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); |
||
104 | return -1; |
||
105 | } |
||
106 | dscf_vlc.table = dscf_table; |
||
107 | dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS; |
||
108 | if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
||
109 | &mpc7_dscf[1], 2, 1, |
||
110 | &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
||
111 | av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); |
||
112 | return -1; |
||
113 | } |
||
114 | hdr_vlc.table = hdr_table; |
||
115 | hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS; |
||
116 | if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
||
117 | &mpc7_hdr[1], 2, 1, |
||
118 | &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
||
119 | av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); |
||
120 | return -1; |
||
121 | } |
||
122 | for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
||
123 | for(j = 0; j < 2; j++){ |
||
124 | quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]]; |
||
125 | quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j]; |
||
126 | if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
||
127 | &mpc7_quant_vlc[i][j][1], 4, 2, |
||
128 | &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){ |
||
129 | av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); |
||
130 | return -1; |
||
131 | } |
||
132 | } |
||
133 | } |
||
134 | vlc_initialized = 1; |
||
135 | |||
136 | return 0; |
||
137 | } |
||
138 | |||
139 | /** |
||
140 | * Fill samples for given subband |
||
141 | */ |
||
142 | static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
||
143 | { |
||
144 | int i, i1, t; |
||
145 | switch(idx){ |
||
146 | case -1: |
||
147 | for(i = 0; i < SAMPLES_PER_BAND; i++){ |
||
148 | *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
||
149 | } |
||
150 | break; |
||
151 | case 1: |
||
152 | i1 = get_bits1(gb); |
||
153 | for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
||
154 | t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
||
155 | *dst++ = mpc7_idx30[t]; |
||
156 | *dst++ = mpc7_idx31[t]; |
||
157 | *dst++ = mpc7_idx32[t]; |
||
158 | } |
||
159 | break; |
||
160 | case 2: |
||
161 | i1 = get_bits1(gb); |
||
162 | for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
||
163 | t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
||
164 | *dst++ = mpc7_idx50[t]; |
||
165 | *dst++ = mpc7_idx51[t]; |
||
166 | } |
||
167 | break; |
||
168 | case 3: case 4: case 5: case 6: case 7: |
||
169 | i1 = get_bits1(gb); |
||
170 | for(i = 0; i < SAMPLES_PER_BAND; i++) |
||
171 | *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
||
172 | break; |
||
173 | case 8: case 9: case 10: case 11: case 12: |
||
174 | case 13: case 14: case 15: case 16: case 17: |
||
175 | t = (1 << (idx - 2)) - 1; |
||
176 | for(i = 0; i < SAMPLES_PER_BAND; i++) |
||
177 | *dst++ = get_bits(gb, idx - 1) - t; |
||
178 | break; |
||
179 | default: // case 0 and -2..-17 |
||
180 | return; |
||
181 | } |
||
182 | } |
||
183 | |||
184 | static int get_scale_idx(GetBitContext *gb, int ref) |
||
185 | { |
||
186 | int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
||
187 | if (t == 8) |
||
188 | return get_bits(gb, 6); |
||
189 | return ref + t; |
||
190 | } |
||
191 | |||
192 | static int mpc7_decode_frame(AVCodecContext * avctx, void *data, |
||
193 | int *got_frame_ptr, AVPacket *avpkt) |
||
194 | { |
||
195 | AVFrame *frame = data; |
||
196 | const uint8_t *buf = avpkt->data; |
||
197 | int buf_size; |
||
198 | MPCContext *c = avctx->priv_data; |
||
199 | GetBitContext gb; |
||
200 | int i, ch; |
||
201 | int mb = -1; |
||
202 | Band *bands = c->bands; |
||
203 | int off, ret, last_frame, skip; |
||
204 | int bits_used, bits_avail; |
||
205 | |||
206 | memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); |
||
207 | |||
208 | buf_size = avpkt->size & ~3; |
||
209 | if (buf_size <= 0) { |
||
210 | av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", |
||
211 | avpkt->size); |
||
212 | return AVERROR_INVALIDDATA; |
||
213 | } |
||
214 | if (buf_size != avpkt->size) { |
||
215 | av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " |
||
216 | "extra bytes at the end will be skipped.\n"); |
||
217 | } |
||
218 | |||
219 | skip = buf[0]; |
||
220 | last_frame = buf[1]; |
||
221 | buf += 4; |
||
222 | buf_size -= 4; |
||
223 | |||
224 | /* get output buffer */ |
||
225 | frame->nb_samples = MPC_FRAME_SIZE; |
||
226 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
||
227 | return ret; |
||
228 | |||
229 | av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); |
||
230 | if (!c->bits) |
||
231 | return AVERROR(ENOMEM); |
||
232 | c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, |
||
233 | buf_size >> 2); |
||
234 | init_get_bits(&gb, c->bits, buf_size * 8); |
||
235 | skip_bits_long(&gb, skip); |
||
236 | |||
237 | /* read subband indexes */ |
||
238 | for(i = 0; i <= c->maxbands; i++){ |
||
239 | for(ch = 0; ch < 2; ch++){ |
||
240 | int t = 4; |
||
241 | if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
||
242 | if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); |
||
243 | else bands[i].res[ch] = bands[i-1].res[ch] + t; |
||
244 | if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) { |
||
245 | av_log(avctx, AV_LOG_ERROR, "subband index invalid\n"); |
||
246 | return AVERROR_INVALIDDATA; |
||
247 | } |
||
248 | } |
||
249 | |||
250 | if(bands[i].res[0] || bands[i].res[1]){ |
||
251 | mb = i; |
||
252 | if(c->MSS) bands[i].msf = get_bits1(&gb); |
||
253 | } |
||
254 | } |
||
255 | /* get scale indexes coding method */ |
||
256 | for(i = 0; i <= mb; i++) |
||
257 | for(ch = 0; ch < 2; ch++) |
||
258 | if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); |
||
259 | /* get scale indexes */ |
||
260 | for(i = 0; i <= mb; i++){ |
||
261 | for(ch = 0; ch < 2; ch++){ |
||
262 | if(bands[i].res[ch]){ |
||
263 | bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; |
||
264 | bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); |
||
265 | switch(bands[i].scfi[ch]){ |
||
266 | case 0: |
||
267 | bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
||
268 | bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
||
269 | break; |
||
270 | case 1: |
||
271 | bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
||
272 | bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; |
||
273 | break; |
||
274 | case 2: |
||
275 | bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
||
276 | bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
||
277 | break; |
||
278 | case 3: |
||
279 | bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
||
280 | break; |
||
281 | } |
||
282 | c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; |
||
283 | } |
||
284 | } |
||
285 | } |
||
286 | /* get quantizers */ |
||
287 | memset(c->Q, 0, sizeof(c->Q)); |
||
288 | off = 0; |
||
289 | for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
||
290 | for(ch = 0; ch < 2; ch++) |
||
291 | idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); |
||
292 | |||
293 | ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2); |
||
294 | if(last_frame) |
||
295 | frame->nb_samples = c->lastframelen; |
||
296 | |||
297 | bits_used = get_bits_count(&gb); |
||
298 | bits_avail = buf_size * 8; |
||
299 | if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) { |
||
300 | av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); |
||
301 | return -1; |
||
302 | } |
||
303 | if(c->frames_to_skip){ |
||
304 | c->frames_to_skip--; |
||
305 | *got_frame_ptr = 0; |
||
306 | return avpkt->size; |
||
307 | } |
||
308 | |||
309 | *got_frame_ptr = 1; |
||
310 | |||
311 | return avpkt->size; |
||
312 | } |
||
313 | |||
314 | static void mpc7_decode_flush(AVCodecContext *avctx) |
||
315 | { |
||
316 | MPCContext *c = avctx->priv_data; |
||
317 | |||
318 | memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
||
319 | c->frames_to_skip = 32; |
||
320 | } |
||
321 | |||
322 | static av_cold int mpc7_decode_close(AVCodecContext *avctx) |
||
323 | { |
||
324 | MPCContext *c = avctx->priv_data; |
||
325 | av_freep(&c->bits); |
||
326 | c->buf_size = 0; |
||
327 | return 0; |
||
328 | } |
||
329 | |||
330 | AVCodec ff_mpc7_decoder = { |
||
331 | .name = "mpc7", |
||
332 | .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
||
333 | .type = AVMEDIA_TYPE_AUDIO, |
||
334 | .id = AV_CODEC_ID_MUSEPACK7, |
||
335 | .priv_data_size = sizeof(MPCContext), |
||
336 | .init = mpc7_decode_init, |
||
337 | .close = mpc7_decode_close, |
||
338 | .decode = mpc7_decode_frame, |
||
339 | .flush = mpc7_decode_flush, |
||
340 | .capabilities = AV_CODEC_CAP_DR1, |
||
341 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
||
342 | AV_SAMPLE_FMT_NONE }, |
||
343 | };=>>>>>=>>=>>>=>>=>>><>>>>>>>><>><>><>>><>><>><> |