Subversion Repositories Kolibri OS

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
4349 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 "dsputil.h"
34
#include "internal.h"
35
#include "mpegaudiodsp.h"
36
 
37
#include "mpc.h"
38
#include "mpc7data.h"
39
 
40
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
41
 
42
static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
43
{
44
       0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
45
       5636, 6164, 6676, 7224
46
};
47
 
48
 
49
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
50
{
51
    int i, j;
52
    MPCContext *c = avctx->priv_data;
53
    GetBitContext gb;
54
    LOCAL_ALIGNED_16(uint8_t, buf, [16]);
55
    static int vlc_initialized = 0;
56
 
57
    static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
58
    static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
59
    static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
60
    static VLC_TYPE quant_tables[7224][2];
61
 
62
    /* Musepack SV7 is always stereo */
63
    if (avctx->channels != 2) {
64
        avpriv_request_sample(avctx, "%d channels", avctx->channels);
65
        return AVERROR_PATCHWELCOME;
66
    }
67
 
68
    if(avctx->extradata_size < 16){
69
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
70
        return -1;
71
    }
72
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
73
    av_lfg_init(&c->rnd, 0xDEADBEEF);
74
    ff_dsputil_init(&c->dsp, avctx);
75
    ff_mpadsp_init(&c->mpadsp);
76
    c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
77
    ff_mpc_init();
78
    init_get_bits(&gb, buf, 128);
79
 
80
    c->IS = get_bits1(&gb);
81
    c->MSS = get_bits1(&gb);
82
    c->maxbands = get_bits(&gb, 6);
83
    if(c->maxbands >= BANDS){
84
        av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
85
        return -1;
86
    }
87
    skip_bits_long(&gb, 88);
88
    c->gapless = get_bits1(&gb);
89
    c->lastframelen = get_bits(&gb, 11);
90
    av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
91
            c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
92
    c->frames_to_skip = 0;
93
 
94
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
95
    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
96
 
97
    if(vlc_initialized) return 0;
98
    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
99
    scfi_vlc.table = scfi_table;
100
    scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
101
    if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
102
                &mpc7_scfi[1], 2, 1,
103
                &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
104
        av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
105
        return -1;
106
    }
107
    dscf_vlc.table = dscf_table;
108
    dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
109
    if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
110
                &mpc7_dscf[1], 2, 1,
111
                &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
112
        av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
113
        return -1;
114
    }
115
    hdr_vlc.table = hdr_table;
116
    hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
117
    if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
118
                &mpc7_hdr[1], 2, 1,
119
                &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
120
        av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
121
        return -1;
122
    }
123
    for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
124
        for(j = 0; j < 2; j++){
125
            quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
126
            quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
127
            if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
128
                        &mpc7_quant_vlc[i][j][1], 4, 2,
129
                        &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
130
                av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
131
                return -1;
132
            }
133
        }
134
    }
135
    vlc_initialized = 1;
136
 
137
    return 0;
138
}
139
 
140
/**
141
 * Fill samples for given subband
142
 */
143
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
144
{
145
    int i, i1, t;
146
    switch(idx){
147
    case -1:
148
        for(i = 0; i < SAMPLES_PER_BAND; i++){
149
            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
150
        }
151
        break;
152
    case 1:
153
        i1 = get_bits1(gb);
154
        for(i = 0; i < SAMPLES_PER_BAND/3; i++){
155
            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
156
            *dst++ = mpc7_idx30[t];
157
            *dst++ = mpc7_idx31[t];
158
            *dst++ = mpc7_idx32[t];
159
        }
160
        break;
161
    case 2:
162
        i1 = get_bits1(gb);
163
        for(i = 0; i < SAMPLES_PER_BAND/2; i++){
164
            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
165
            *dst++ = mpc7_idx50[t];
166
            *dst++ = mpc7_idx51[t];
167
        }
168
        break;
169
    case  3: case  4: case  5: case  6: case  7:
170
        i1 = get_bits1(gb);
171
        for(i = 0; i < SAMPLES_PER_BAND; i++)
172
            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
173
        break;
174
    case  8: case  9: case 10: case 11: case 12:
175
    case 13: case 14: case 15: case 16: case 17:
176
        t = (1 << (idx - 2)) - 1;
177
        for(i = 0; i < SAMPLES_PER_BAND; i++)
178
            *dst++ = get_bits(gb, idx - 1) - t;
179
        break;
180
    default: // case 0 and -2..-17
181
        return;
182
    }
183
}
184
 
185
static int get_scale_idx(GetBitContext *gb, int ref)
186
{
187
    int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
188
    if (t == 8)
189
        return get_bits(gb, 6);
190
    return ref + t;
191
}
192
 
193
static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
194
                             int *got_frame_ptr, AVPacket *avpkt)
195
{
196
    AVFrame *frame     = data;
197
    const uint8_t *buf = avpkt->data;
198
    int buf_size;
199
    MPCContext *c = avctx->priv_data;
200
    GetBitContext gb;
201
    int i, ch;
202
    int mb = -1;
203
    Band *bands = c->bands;
204
    int off, ret, last_frame, skip;
205
    int bits_used, bits_avail;
206
 
207
    memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
208
 
209
    buf_size = avpkt->size & ~3;
210
    if (buf_size <= 0) {
211
        av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
212
               avpkt->size);
213
        return AVERROR_INVALIDDATA;
214
    }
215
    if (buf_size != avpkt->size) {
216
        av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
217
               "extra bytes at the end will be skipped.\n");
218
    }
219
 
220
    skip       = buf[0];
221
    last_frame = buf[1];
222
    buf       += 4;
223
    buf_size  -= 4;
224
 
225
    /* get output buffer */
226
    frame->nb_samples = MPC_FRAME_SIZE;
227
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
228
        return ret;
229
 
230
    av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
231
    if (!c->bits)
232
        return AVERROR(ENOMEM);
233
    c->dsp.bswap_buf((uint32_t *)c->bits, (const uint32_t *)buf, 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   = CODEC_CAP_DR1,
341
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
342
                                                      AV_SAMPLE_FMT_NONE },
343
};