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/* |
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* Musepack SV7 decoder |
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* Copyright (c) 2006 Konstantin Shishkov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
23 |
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* @file |
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* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples |
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* divided into 32 subbands. |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/mem_internal.h" |
32 |
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#include "libavutil/thread.h" |
33 |
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34 |
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#include "avcodec.h" |
35 |
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#include "get_bits.h" |
36 |
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#include "internal.h" |
37 |
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#include "mpegaudiodsp.h" |
38 |
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39 |
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#include "mpc.h" |
40 |
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#include "mpc7data.h" |
41 |
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42 |
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static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
43 |
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44 |
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2 |
static av_cold void mpc7_init_static(void) |
45 |
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{ |
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static VLC_TYPE quant_tables[7224][2]; |
47 |
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2 |
const uint8_t *raw_quant_table = mpc7_quant_vlcs; |
48 |
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49 |
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2 |
INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
50 |
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&mpc7_scfi[1], 2, |
51 |
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&mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS); |
52 |
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2 |
INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
53 |
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&mpc7_dscf[1], 2, |
54 |
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&mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS); |
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2 |
INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
56 |
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&mpc7_hdr[1], 2, |
57 |
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&mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS); |
58 |
✓✓ |
16 |
for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
59 |
✓✓ |
42 |
for (int j = 0; j < 2; j++) { |
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quant_vlc[i][j].table = &quant_tables[offset]; |
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quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset; |
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ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
63 |
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&raw_quant_table[1], 2, |
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&raw_quant_table[0], 2, 1, |
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mpc7_quant_vlc_off[i], |
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INIT_VLC_STATIC_OVERLONG, NULL); |
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raw_quant_table += 2 * mpc7_quant_vlc_sizes[i]; |
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offset += quant_vlc[i][j].table_size; |
69 |
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} |
70 |
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} |
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2 |
ff_mpa_synth_init_fixed(); |
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} |
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3 |
static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
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{ |
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static AVOnce init_static_once = AV_ONCE_INIT; |
77 |
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MPCContext *c = avctx->priv_data; |
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GetBitContext gb; |
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LOCAL_ALIGNED_16(uint8_t, buf, [16]); |
80 |
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81 |
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/* Musepack SV7 is always stereo */ |
82 |
✗✓ |
3 |
if (avctx->channels != 2) { |
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avpriv_request_sample(avctx, "%d channels", avctx->channels); |
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return AVERROR_PATCHWELCOME; |
85 |
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} |
86 |
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✗✓ |
3 |
if(avctx->extradata_size < 16){ |
88 |
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av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
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return AVERROR_INVALIDDATA; |
90 |
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} |
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3 |
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
92 |
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3 |
av_lfg_init(&c->rnd, 0xDEADBEEF); |
93 |
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ff_bswapdsp_init(&c->bdsp); |
94 |
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ff_mpadsp_init(&c->mpadsp); |
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c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4); |
96 |
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3 |
init_get_bits(&gb, buf, 128); |
97 |
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98 |
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c->IS = get_bits1(&gb); |
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c->MSS = get_bits1(&gb); |
100 |
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c->maxbands = get_bits(&gb, 6); |
101 |
✗✓ |
3 |
if(c->maxbands >= BANDS){ |
102 |
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av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); |
103 |
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return AVERROR_INVALIDDATA; |
104 |
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} |
105 |
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skip_bits_long(&gb, 88); |
106 |
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c->gapless = get_bits1(&gb); |
107 |
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c->lastframelen = get_bits(&gb, 11); |
108 |
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av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", |
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c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); |
110 |
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c->frames_to_skip = 0; |
111 |
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112 |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
113 |
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avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
114 |
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115 |
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ff_thread_once(&init_static_once, mpc7_init_static); |
116 |
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117 |
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return 0; |
118 |
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} |
119 |
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120 |
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/** |
121 |
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* Fill samples for given subband |
122 |
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*/ |
123 |
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29184 |
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
124 |
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{ |
125 |
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int i, i1, t; |
126 |
✗✓✓✓
✓✓ |
29184 |
switch(idx){ |
127 |
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case -1: |
128 |
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for(i = 0; i < SAMPLES_PER_BAND; i++){ |
129 |
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*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
130 |
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} |
131 |
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break; |
132 |
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3499 |
case 1: |
133 |
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3499 |
i1 = get_bits1(gb); |
134 |
✓✓ |
45487 |
for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
135 |
|
41988 |
t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
136 |
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41988 |
*dst++ = mpc7_idx30[t]; |
137 |
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41988 |
*dst++ = mpc7_idx31[t]; |
138 |
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41988 |
*dst++ = mpc7_idx32[t]; |
139 |
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} |
140 |
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3499 |
break; |
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6128 |
case 2: |
142 |
|
6128 |
i1 = get_bits1(gb); |
143 |
✓✓ |
116432 |
for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
144 |
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110304 |
t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
145 |
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110304 |
*dst++ = mpc7_idx50[t]; |
146 |
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110304 |
*dst++ = mpc7_idx51[t]; |
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} |
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6128 |
break; |
149 |
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7935 |
case 3: case 4: case 5: case 6: case 7: |
150 |
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7935 |
i1 = get_bits1(gb); |
151 |
✓✓ |
293595 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
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285660 |
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2); |
153 |
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7935 |
break; |
154 |
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720 |
case 8: case 9: case 10: case 11: case 12: |
155 |
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case 13: case 14: case 15: case 16: case 17: |
156 |
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720 |
t = (1 << (idx - 2)) - 1; |
157 |
✓✓ |
26640 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
158 |
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25920 |
*dst++ = get_bits(gb, idx - 1) - t; |
159 |
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720 |
break; |
160 |
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10902 |
default: // case 0 and -2..-17 |
161 |
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10902 |
return; |
162 |
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} |
163 |
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} |
164 |
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165 |
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31340 |
static int get_scale_idx(GetBitContext *gb, int ref) |
166 |
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{ |
167 |
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31340 |
int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1); |
168 |
✓✓ |
31340 |
if (t == 8) |
169 |
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3784 |
return get_bits(gb, 6); |
170 |
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27556 |
return ref + t; |
171 |
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} |
172 |
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173 |
|
456 |
static int mpc7_decode_frame(AVCodecContext * avctx, void *data, |
174 |
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int *got_frame_ptr, AVPacket *avpkt) |
175 |
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{ |
176 |
|
456 |
AVFrame *frame = data; |
177 |
|
456 |
const uint8_t *buf = avpkt->data; |
178 |
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int buf_size; |
179 |
|
456 |
MPCContext *c = avctx->priv_data; |
180 |
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GetBitContext gb; |
181 |
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int i, ch; |
182 |
|
456 |
int mb = -1; |
183 |
|
456 |
Band *bands = c->bands; |
184 |
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int off, ret, last_frame, skip; |
185 |
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int bits_used, bits_avail; |
186 |
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187 |
|
456 |
memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); |
188 |
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189 |
|
456 |
buf_size = avpkt->size & ~3; |
190 |
✗✓ |
456 |
if (buf_size <= 0) { |
191 |
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av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", |
192 |
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avpkt->size); |
193 |
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return AVERROR_INVALIDDATA; |
194 |
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} |
195 |
✗✓ |
456 |
if (buf_size != avpkt->size) { |
196 |
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av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " |
197 |
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"extra bytes at the end will be skipped.\n"); |
198 |
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} |
199 |
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|
200 |
|
456 |
skip = buf[0]; |
201 |
|
456 |
last_frame = buf[1]; |
202 |
|
456 |
buf += 4; |
203 |
|
456 |
buf_size -= 4; |
204 |
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|
205 |
|
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/* get output buffer */ |
206 |
|
456 |
frame->nb_samples = MPC_FRAME_SIZE; |
207 |
✗✓ |
456 |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
208 |
|
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return ret; |
209 |
|
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|
210 |
|
456 |
av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); |
211 |
✗✓ |
456 |
if (!c->bits) |
212 |
|
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return AVERROR(ENOMEM); |
213 |
|
456 |
c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, |
214 |
|
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buf_size >> 2); |
215 |
✗✓ |
456 |
if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0) |
216 |
|
|
return ret; |
217 |
|
456 |
skip_bits_long(&gb, skip); |
218 |
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|
219 |
|
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/* read subband indexes */ |
220 |
✓✓ |
13680 |
for(i = 0; i <= c->maxbands; i++){ |
221 |
✓✓ |
39672 |
for(ch = 0; ch < 2; ch++){ |
222 |
✓✓ |
26448 |
int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4; |
223 |
✓✓ |
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 |
✓✗✗✓
|
26448 |
if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) { |
226 |
|
|
av_log(avctx, AV_LOG_ERROR, "subband index invalid\n"); |
227 |
|
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return AVERROR_INVALIDDATA; |
228 |
|
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} |
229 |
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} |
230 |
|
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|
231 |
✓✓✓✓
|
13224 |
if(bands[i].res[0] || bands[i].res[1]){ |
232 |
|
10414 |
mb = i; |
233 |
✓✗ |
10414 |
if(c->MSS) bands[i].msf = get_bits1(&gb); |
234 |
|
|
} |
235 |
|
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} |
236 |
|
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/* get scale indexes coding method */ |
237 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++) |
238 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++) |
239 |
✓✓ |
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 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++){ |
242 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++){ |
243 |
✓✓ |
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 |
✓✓✓✓
✗ |
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 |
✓✓ |
15048 |
for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
271 |
✓✓ |
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 |
✗✓ |
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 |
✓✗✓✗
✗✓ |
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 |
✗✓ |
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 |
|
|
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 |
|
|
}; |