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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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/** |
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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 "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "mpegaudiodsp.h" |
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#include "mpc.h" |
37 |
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#include "mpc7data.h" |
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static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
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static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] = |
42 |
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{ |
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0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124, |
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5636, 6164, 6676, 7224 |
45 |
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}; |
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47 |
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48 |
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3 |
static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
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{ |
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int i, j, ret; |
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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]); |
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static int vlc_initialized = 0; |
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static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2]; |
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static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2]; |
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static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2]; |
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static VLC_TYPE quant_tables[7224][2]; |
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/* Musepack SV7 is always stereo */ |
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✗✓ |
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if (avctx->channels != 2) { |
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avpriv_request_sample(avctx, "%d channels", avctx->channels); |
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return AVERROR_PATCHWELCOME; |
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} |
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✗✓ |
3 |
if(avctx->extradata_size < 16){ |
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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; |
70 |
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} |
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memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
72 |
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av_lfg_init(&c->rnd, 0xDEADBEEF); |
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ff_bswapdsp_init(&c->bdsp); |
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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); |
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ff_mpc_init(); |
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init_get_bits(&gb, buf, 128); |
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c->IS = get_bits1(&gb); |
80 |
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c->MSS = get_bits1(&gb); |
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c->maxbands = get_bits(&gb, 6); |
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✗✓ |
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if(c->maxbands >= BANDS){ |
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av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); |
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return AVERROR_INVALIDDATA; |
85 |
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} |
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skip_bits_long(&gb, 88); |
87 |
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c->gapless = get_bits1(&gb); |
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c->lastframelen = get_bits(&gb, 11); |
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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); |
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c->frames_to_skip = 0; |
92 |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
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avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
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✓✓ |
3 |
if(vlc_initialized) return 0; |
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av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
98 |
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2 |
scfi_vlc.table = scfi_table; |
99 |
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scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS; |
100 |
✗✓ |
2 |
if ((ret = init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
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&mpc7_scfi[1], 2, 1, |
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&mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) { |
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av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); |
104 |
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return ret; |
105 |
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} |
106 |
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2 |
dscf_vlc.table = dscf_table; |
107 |
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2 |
dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS; |
108 |
✗✓ |
2 |
if ((ret = init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
109 |
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&mpc7_dscf[1], 2, 1, |
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&mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) { |
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av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); |
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return ret; |
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} |
114 |
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hdr_vlc.table = hdr_table; |
115 |
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2 |
hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS; |
116 |
✗✓ |
2 |
if ((ret = init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
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&mpc7_hdr[1], 2, 1, |
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&mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) { |
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av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); |
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return ret; |
121 |
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} |
122 |
✓✓ |
16 |
for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
123 |
✓✓ |
42 |
for(j = 0; j < 2; j++){ |
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quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]]; |
125 |
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quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j]; |
126 |
✗✓ |
28 |
if ((ret = init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
127 |
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&mpc7_quant_vlc[i][j][1], 4, 2, |
128 |
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&mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC))) { |
129 |
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av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); |
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return ret; |
131 |
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} |
132 |
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} |
133 |
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} |
134 |
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2 |
vlc_initialized = 1; |
135 |
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136 |
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2 |
return 0; |
137 |
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} |
138 |
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139 |
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/** |
140 |
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* Fill samples for given subband |
141 |
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*/ |
142 |
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29184 |
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
143 |
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{ |
144 |
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int i, i1, t; |
145 |
✗✓✓✓
✓✓ |
29184 |
switch(idx){ |
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case -1: |
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for(i = 0; i < SAMPLES_PER_BAND; i++){ |
148 |
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*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
149 |
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} |
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break; |
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3499 |
case 1: |
152 |
|
3499 |
i1 = get_bits1(gb); |
153 |
✓✓ |
45487 |
for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
154 |
|
41988 |
t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
155 |
|
41988 |
*dst++ = mpc7_idx30[t]; |
156 |
|
41988 |
*dst++ = mpc7_idx31[t]; |
157 |
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41988 |
*dst++ = mpc7_idx32[t]; |
158 |
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} |
159 |
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3499 |
break; |
160 |
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6128 |
case 2: |
161 |
|
6128 |
i1 = get_bits1(gb); |
162 |
✓✓ |
116432 |
for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
163 |
|
110304 |
t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
164 |
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110304 |
*dst++ = mpc7_idx50[t]; |
165 |
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110304 |
*dst++ = mpc7_idx51[t]; |
166 |
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} |
167 |
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6128 |
break; |
168 |
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7935 |
case 3: case 4: case 5: case 6: case 7: |
169 |
|
7935 |
i1 = get_bits1(gb); |
170 |
✓✓ |
293595 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
171 |
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285660 |
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
172 |
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7935 |
break; |
173 |
|
720 |
case 8: case 9: case 10: case 11: case 12: |
174 |
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case 13: case 14: case 15: case 16: case 17: |
175 |
|
720 |
t = (1 << (idx - 2)) - 1; |
176 |
✓✓ |
26640 |
for(i = 0; i < SAMPLES_PER_BAND; i++) |
177 |
|
25920 |
*dst++ = get_bits(gb, idx - 1) - t; |
178 |
|
720 |
break; |
179 |
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10902 |
default: // case 0 and -2..-17 |
180 |
|
10902 |
return; |
181 |
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} |
182 |
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} |
183 |
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184 |
|
31340 |
static int get_scale_idx(GetBitContext *gb, int ref) |
185 |
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{ |
186 |
|
31340 |
int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
187 |
✓✓ |
31340 |
if (t == 8) |
188 |
|
3784 |
return get_bits(gb, 6); |
189 |
|
27556 |
return ref + t; |
190 |
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} |
191 |
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192 |
|
456 |
static int mpc7_decode_frame(AVCodecContext * avctx, void *data, |
193 |
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int *got_frame_ptr, AVPacket *avpkt) |
194 |
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{ |
195 |
|
456 |
AVFrame *frame = data; |
196 |
|
456 |
const uint8_t *buf = avpkt->data; |
197 |
|
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int buf_size; |
198 |
|
456 |
MPCContext *c = avctx->priv_data; |
199 |
|
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GetBitContext gb; |
200 |
|
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int i, ch; |
201 |
|
456 |
int mb = -1; |
202 |
|
456 |
Band *bands = c->bands; |
203 |
|
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int off, ret, last_frame, skip; |
204 |
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int bits_used, bits_avail; |
205 |
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|
206 |
|
456 |
memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); |
207 |
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|
208 |
|
456 |
buf_size = avpkt->size & ~3; |
209 |
✗✓ |
456 |
if (buf_size <= 0) { |
210 |
|
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av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", |
211 |
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avpkt->size); |
212 |
|
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return AVERROR_INVALIDDATA; |
213 |
|
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} |
214 |
✗✓ |
456 |
if (buf_size != avpkt->size) { |
215 |
|
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av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " |
216 |
|
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"extra bytes at the end will be skipped.\n"); |
217 |
|
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} |
218 |
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|
219 |
|
456 |
skip = buf[0]; |
220 |
|
456 |
last_frame = buf[1]; |
221 |
|
456 |
buf += 4; |
222 |
|
456 |
buf_size -= 4; |
223 |
|
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|
224 |
|
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/* get output buffer */ |
225 |
|
456 |
frame->nb_samples = MPC_FRAME_SIZE; |
226 |
✗✓ |
456 |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
227 |
|
|
return ret; |
228 |
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|
229 |
|
456 |
av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); |
230 |
✗✓ |
456 |
if (!c->bits) |
231 |
|
|
return AVERROR(ENOMEM); |
232 |
|
456 |
c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, |
233 |
|
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buf_size >> 2); |
234 |
✗✓ |
456 |
if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0) |
235 |
|
|
return ret; |
236 |
|
456 |
skip_bits_long(&gb, skip); |
237 |
|
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|
238 |
|
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/* read subband indexes */ |
239 |
✓✓ |
13680 |
for(i = 0; i <= c->maxbands; i++){ |
240 |
✓✓ |
39672 |
for(ch = 0; ch < 2; ch++){ |
241 |
|
26448 |
int t = 4; |
242 |
✓✓ |
26448 |
if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
243 |
✓✓ |
26448 |
if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); |
244 |
|
25465 |
else bands[i].res[ch] = bands[i-1].res[ch] + t; |
245 |
✓✗✗✓
|
26448 |
if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) { |
246 |
|
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av_log(avctx, AV_LOG_ERROR, "subband index invalid\n"); |
247 |
|
|
return AVERROR_INVALIDDATA; |
248 |
|
|
} |
249 |
|
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} |
250 |
|
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|
251 |
✓✓✓✓
|
13224 |
if(bands[i].res[0] || bands[i].res[1]){ |
252 |
|
10414 |
mb = i; |
253 |
✓✗ |
10414 |
if(c->MSS) bands[i].msf = get_bits1(&gb); |
254 |
|
|
} |
255 |
|
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} |
256 |
|
|
/* get scale indexes coding method */ |
257 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++) |
258 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++) |
259 |
✓✓ |
20828 |
if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); |
260 |
|
|
/* get scale indexes */ |
261 |
✓✓ |
10870 |
for(i = 0; i <= mb; i++){ |
262 |
✓✓ |
31242 |
for(ch = 0; ch < 2; ch++){ |
263 |
✓✓ |
20828 |
if(bands[i].res[ch]){ |
264 |
|
18282 |
bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; |
265 |
|
18282 |
bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); |
266 |
✓✓✓✓
✗ |
18282 |
switch(bands[i].scfi[ch]){ |
267 |
|
1558 |
case 0: |
268 |
|
1558 |
bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
269 |
|
1558 |
bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
270 |
|
1558 |
break; |
271 |
|
2381 |
case 1: |
272 |
|
2381 |
bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
273 |
|
2381 |
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; |
274 |
|
2381 |
break; |
275 |
|
7561 |
case 2: |
276 |
|
7561 |
bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
277 |
|
7561 |
bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
278 |
|
7561 |
break; |
279 |
|
6782 |
case 3: |
280 |
|
6782 |
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
281 |
|
6782 |
break; |
282 |
|
|
} |
283 |
|
18282 |
c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; |
284 |
|
|
} |
285 |
|
|
} |
286 |
|
|
} |
287 |
|
|
/* get quantizers */ |
288 |
|
456 |
memset(c->Q, 0, sizeof(c->Q)); |
289 |
|
456 |
off = 0; |
290 |
✓✓ |
15048 |
for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
291 |
✓✓ |
43776 |
for(ch = 0; ch < 2; ch++) |
292 |
|
29184 |
idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); |
293 |
|
|
|
294 |
|
456 |
ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2); |
295 |
✗✓ |
456 |
if(last_frame) |
296 |
|
|
frame->nb_samples = c->lastframelen; |
297 |
|
|
|
298 |
|
456 |
bits_used = get_bits_count(&gb); |
299 |
|
456 |
bits_avail = buf_size * 8; |
300 |
✓✗✓✗
✗✓ |
456 |
if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) { |
301 |
|
|
av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); |
302 |
|
|
return AVERROR_INVALIDDATA; |
303 |
|
|
} |
304 |
✗✓ |
456 |
if(c->frames_to_skip){ |
305 |
|
|
c->frames_to_skip--; |
306 |
|
|
*got_frame_ptr = 0; |
307 |
|
|
return avpkt->size; |
308 |
|
|
} |
309 |
|
|
|
310 |
|
456 |
*got_frame_ptr = 1; |
311 |
|
|
|
312 |
|
456 |
return avpkt->size; |
313 |
|
|
} |
314 |
|
|
|
315 |
|
|
static void mpc7_decode_flush(AVCodecContext *avctx) |
316 |
|
|
{ |
317 |
|
|
MPCContext *c = avctx->priv_data; |
318 |
|
|
|
319 |
|
|
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
320 |
|
|
c->frames_to_skip = 32; |
321 |
|
|
} |
322 |
|
|
|
323 |
|
3 |
static av_cold int mpc7_decode_close(AVCodecContext *avctx) |
324 |
|
|
{ |
325 |
|
3 |
MPCContext *c = avctx->priv_data; |
326 |
|
3 |
av_freep(&c->bits); |
327 |
|
3 |
c->buf_size = 0; |
328 |
|
3 |
return 0; |
329 |
|
|
} |
330 |
|
|
|
331 |
|
|
AVCodec ff_mpc7_decoder = { |
332 |
|
|
.name = "mpc7", |
333 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
334 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
335 |
|
|
.id = AV_CODEC_ID_MUSEPACK7, |
336 |
|
|
.priv_data_size = sizeof(MPCContext), |
337 |
|
|
.init = mpc7_decode_init, |
338 |
|
|
.close = mpc7_decode_close, |
339 |
|
|
.decode = mpc7_decode_frame, |
340 |
|
|
.flush = mpc7_decode_flush, |
341 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
342 |
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
343 |
|
|
AV_SAMPLE_FMT_NONE }, |
344 |
|
|
}; |