3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/lfg.h"
35 #include "mpegaudiodsp.h"
40 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
42 static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
44 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
45 5636, 6164, 6676, 7224
49 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
52 MPCContext *c = avctx->priv_data;
54 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
55 static int vlc_initialized = 0;
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];
62 /* Musepack SV7 is always stereo */
63 if (avctx->channels != 2) {
64 avpriv_request_sample(avctx, "%d channels", avctx->channels);
65 return AVERROR_PATCHWELCOME;
68 if(avctx->extradata_size < 16){
69 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
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);
78 init_get_bits(&gb, buf, 128);
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);
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;
94 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
95 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
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,
103 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
104 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
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,
111 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
112 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
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,
119 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
120 av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
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);
141 * Fill samples for given subband
143 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
148 for(i = 0; i < SAMPLES_PER_BAND; i++){
149 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
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];
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];
169 case 3: case 4: case 5: case 6: case 7:
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];
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;
180 default: // case 0 and -2..-17
185 static int get_scale_idx(GetBitContext *gb, int ref)
187 int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
189 return get_bits(gb, 6);
193 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
194 int *got_frame_ptr, AVPacket *avpkt)
196 AVFrame *frame = data;
197 const uint8_t *buf = avpkt->data;
199 MPCContext *c = avctx->priv_data;
203 Band *bands = c->bands;
204 int off, ret, last_frame, skip;
205 int bits_used, bits_avail;
207 memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
209 buf_size = avpkt->size & ~3;
211 av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
213 return AVERROR_INVALIDDATA;
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");
225 /* get output buffer */
226 frame->nb_samples = MPC_FRAME_SIZE;
227 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
230 av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
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);
237 /* read subband indexes */
238 for(i = 0; i <= c->maxbands; i++){
239 for(ch = 0; ch < 2; ch++){
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;
250 if(bands[i].res[0] || bands[i].res[1]){
252 if(c->MSS) bands[i].msf = get_bits1(&gb);
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]){
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]);
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];
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]);
279 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
282 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
287 memset(c->Q, 0, sizeof(c->Q));
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);
293 ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
295 frame->nb_samples = c->lastframelen;
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);
303 if(c->frames_to_skip){
314 static void mpc7_decode_flush(AVCodecContext *avctx)
316 MPCContext *c = avctx->priv_data;
318 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
319 c->frames_to_skip = 32;
322 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
324 MPCContext *c = avctx->priv_data;
330 AVCodec ff_mpc7_decoder = {
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 },