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1 | /* | ||
2 | * Audio Processing Technology codec for Bluetooth (aptX) | ||
3 | * | ||
4 | * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | #include "config_components.h" | ||
24 | |||
25 | #include "libavutil/channel_layout.h" | ||
26 | #include "aptx.h" | ||
27 | #include "audio_frame_queue.h" | ||
28 | #include "codec_internal.h" | ||
29 | #include "encode.h" | ||
30 | #include "internal.h" | ||
31 | |||
32 | typedef struct AptXEncContext { | ||
33 | AptXContext common; | ||
34 | AudioFrameQueue afq; | ||
35 | } AptXEncContext; | ||
36 | |||
37 | /* | ||
38 | * Half-band QMF analysis filter realized with a polyphase FIR filter. | ||
39 | * Split into 2 subbands and downsample by 2. | ||
40 | * So for each pair of samples that goes in, one sample goes out, | ||
41 | * split into 2 separate subbands. | ||
42 | */ | ||
43 | av_always_inline | ||
44 | 1675808 | static void aptx_qmf_polyphase_analysis(FilterSignal signal[NB_FILTERS], | |
45 | const int32_t coeffs[NB_FILTERS][FILTER_TAPS], | ||
46 | int shift, | ||
47 | int32_t samples[NB_FILTERS], | ||
48 | int32_t *low_subband_output, | ||
49 | int32_t *high_subband_output) | ||
50 | { | ||
51 | int32_t subbands[NB_FILTERS]; | ||
52 | int i; | ||
53 | |||
54 |
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5027424 | for (i = 0; i < NB_FILTERS; i++) { |
55 | 3351616 | aptx_qmf_filter_signal_push(&signal[i], samples[NB_FILTERS-1-i]); | |
56 | 3351616 | subbands[i] = aptx_qmf_convolution(&signal[i], coeffs[i], shift); | |
57 | } | ||
58 | |||
59 | 1675808 | *low_subband_output = av_clip_intp2(subbands[0] + subbands[1], 23); | |
60 | 1675808 | *high_subband_output = av_clip_intp2(subbands[0] - subbands[1], 23); | |
61 | 1675808 | } | |
62 | |||
63 | /* | ||
64 | * Two stage QMF analysis tree. | ||
65 | * Split 4 input samples into 4 subbands and downsample by 4. | ||
66 | * So for each group of 4 samples that goes in, one sample goes out, | ||
67 | * split into 4 separate subbands. | ||
68 | */ | ||
69 | 418952 | static void aptx_qmf_tree_analysis(QMFAnalysis *qmf, | |
70 | int32_t samples[4], | ||
71 | int32_t subband_samples[4]) | ||
72 | { | ||
73 | int32_t intermediate_samples[4]; | ||
74 | int i; | ||
75 | |||
76 | /* Split 4 input samples into 2 intermediate subbands downsampled to 2 samples */ | ||
77 |
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1256856 | for (i = 0; i < 2; i++) |
78 | 837904 | aptx_qmf_polyphase_analysis(qmf->outer_filter_signal, | |
79 | aptx_qmf_outer_coeffs, 23, | ||
80 | 837904 | &samples[2*i], | |
81 | &intermediate_samples[0+i], | ||
82 | 837904 | &intermediate_samples[2+i]); | |
83 | |||
84 | /* Split 2 intermediate subband samples into 4 final subbands downsampled to 1 sample */ | ||
85 |
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1256856 | for (i = 0; i < 2; i++) |
86 | 837904 | aptx_qmf_polyphase_analysis(qmf->inner_filter_signal[i], | |
87 | aptx_qmf_inner_coeffs, 23, | ||
88 | 837904 | &intermediate_samples[2*i], | |
89 | 837904 | &subband_samples[2*i+0], | |
90 | 837904 | &subband_samples[2*i+1]); | |
91 | 418952 | } | |
92 | |||
93 | av_always_inline | ||
94 | 1675808 | static int32_t aptx_bin_search(int32_t value, int32_t factor, | |
95 | const int32_t *intervals, int32_t nb_intervals) | ||
96 | { | ||
97 | 1675808 | int32_t idx = 0; | |
98 | int i; | ||
99 | |||
100 |
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8379040 | for (i = nb_intervals >> 1; i > 0; i >>= 1) |
101 |
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6703232 | if (MUL64(factor, intervals[idx + i]) <= ((int64_t)value << 24)) |
102 | 2573224 | idx += i; | |
103 | |||
104 | 1675808 | return idx; | |
105 | } | ||
106 | |||
107 | 1675808 | static void aptx_quantize_difference(Quantize *quantize, | |
108 | int32_t sample_difference, | ||
109 | int32_t dither, | ||
110 | int32_t quantization_factor, | ||
111 | ConstTables *tables) | ||
112 | { | ||
113 | 1675808 | const int32_t *intervals = tables->quantize_intervals; | |
114 | int32_t quantized_sample, dithered_sample, parity_change; | ||
115 | int32_t d, mean, interval, inv, sample_difference_abs; | ||
116 | int64_t error; | ||
117 | |||
118 | 1675808 | sample_difference_abs = FFABS(sample_difference); | |
119 | 1675808 | sample_difference_abs = FFMIN(sample_difference_abs, (1 << 23) - 1); | |
120 | |||
121 | 1675808 | quantized_sample = aptx_bin_search(sample_difference_abs >> 4, | |
122 | quantization_factor, | ||
123 | 1675808 | intervals, tables->tables_size); | |
124 | |||
125 | 1675808 | d = rshift32_clip24(MULH(dither, dither), 7) - (1 << 23); | |
126 | 1675808 | d = rshift64(MUL64(d, tables->quantize_dither_factors[quantized_sample]), 23); | |
127 | |||
128 | 1675808 | intervals += quantized_sample; | |
129 | 1675808 | mean = (intervals[1] + intervals[0]) / 2; | |
130 | 1675808 | interval = (intervals[1] - intervals[0]) * (-(sample_difference < 0) | 1); | |
131 | |||
132 | 1675808 | dithered_sample = rshift64_clip24(MUL64(dither, interval) + ((int64_t)av_clip_intp2(mean + d, 23) << 32), 32); | |
133 | 1675808 | error = ((int64_t)sample_difference_abs << 20) - MUL64(dithered_sample, quantization_factor); | |
134 |
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1675808 | quantize->error = FFABS(rshift64(error, 23)); |
135 | |||
136 | 1675808 | parity_change = quantized_sample; | |
137 |
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1675808 | if (error < 0) |
138 | 801351 | quantized_sample--; | |
139 | else | ||
140 | 874457 | parity_change--; | |
141 | |||
142 | 1675808 | inv = -(sample_difference < 0); | |
143 | 1675808 | quantize->quantized_sample = quantized_sample ^ inv; | |
144 | 1675808 | quantize->quantized_sample_parity_change = parity_change ^ inv; | |
145 | 1675808 | } | |
146 | |||
147 | 418952 | static void aptx_encode_channel(Channel *channel, int32_t samples[4], int hd) | |
148 | { | ||
149 | int32_t subband_samples[4]; | ||
150 | int subband; | ||
151 | 418952 | aptx_qmf_tree_analysis(&channel->qmf, samples, subband_samples); | |
152 | 418952 | ff_aptx_generate_dither(channel); | |
153 |
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2094760 | for (subband = 0; subband < NB_SUBBANDS; subband++) { |
154 | 1675808 | int32_t diff = av_clip_intp2(subband_samples[subband] - channel->prediction[subband].predicted_sample, 23); | |
155 | 1675808 | aptx_quantize_difference(&channel->quantize[subband], diff, | |
156 | channel->dither[subband], | ||
157 | channel->invert_quantize[subband].quantization_factor, | ||
158 | &ff_aptx_quant_tables[hd][subband]); | ||
159 | } | ||
160 | 418952 | } | |
161 | |||
162 | 209476 | static void aptx_insert_sync(Channel channels[NB_CHANNELS], int32_t *idx) | |
163 | { | ||
164 |
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209476 | if (aptx_check_parity(channels, idx)) { |
165 | int i; | ||
166 | Channel *c; | ||
167 | static const int map[] = { 1, 2, 0, 3 }; | ||
168 | 105071 | Quantize *min = &channels[NB_CHANNELS-1].quantize[map[0]]; | |
169 |
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315213 | for (c = &channels[NB_CHANNELS-1]; c >= channels; c--) |
170 |
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1050710 | for (i = 0; i < NB_SUBBANDS; i++) |
171 |
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840568 | if (c->quantize[map[i]].error < min->error) |
172 | 199417 | min = &c->quantize[map[i]]; | |
173 | |||
174 | /* Forcing the desired parity is done by offsetting by 1 the quantized | ||
175 | * sample from the subband featuring the smallest quantization error. */ | ||
176 | 105071 | min->quantized_sample = min->quantized_sample_parity_change; | |
177 | } | ||
178 | 209476 | } | |
179 | |||
180 | 209476 | static uint16_t aptx_pack_codeword(Channel *channel) | |
181 | { | ||
182 | 209476 | int32_t parity = aptx_quantized_parity(channel); | |
183 | 209476 | return (((channel->quantize[3].quantized_sample & 0x06) | parity) << 13) | |
184 | 209476 | | (((channel->quantize[2].quantized_sample & 0x03) ) << 11) | |
185 | 209476 | | (((channel->quantize[1].quantized_sample & 0x0F) ) << 7) | |
186 | 209476 | | (((channel->quantize[0].quantized_sample & 0x7F) ) << 0); | |
187 | } | ||
188 | |||
189 | 628428 | static uint32_t aptxhd_pack_codeword(Channel *channel) | |
190 | { | ||
191 | 628428 | int32_t parity = aptx_quantized_parity(channel); | |
192 | 628428 | return (((channel->quantize[3].quantized_sample & 0x01E) | parity) << 19) | |
193 | 628428 | | (((channel->quantize[2].quantized_sample & 0x00F) ) << 15) | |
194 | 628428 | | (((channel->quantize[1].quantized_sample & 0x03F) ) << 9) | |
195 | 628428 | | (((channel->quantize[0].quantized_sample & 0x1FF) ) << 0); | |
196 | } | ||
197 | |||
198 | 209476 | static void aptx_encode_samples(AptXContext *ctx, | |
199 | int32_t samples[NB_CHANNELS][4], | ||
200 | uint8_t *output) | ||
201 | { | ||
202 | int channel; | ||
203 |
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628428 | for (channel = 0; channel < NB_CHANNELS; channel++) |
204 | 418952 | aptx_encode_channel(&ctx->channels[channel], samples[channel], ctx->hd); | |
205 | |||
206 | 209476 | aptx_insert_sync(ctx->channels, &ctx->sync_idx); | |
207 | |||
208 |
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628428 | for (channel = 0; channel < NB_CHANNELS; channel++) { |
209 | 418952 | ff_aptx_invert_quantize_and_prediction(&ctx->channels[channel], ctx->hd); | |
210 |
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418952 | if (ctx->hd) |
211 | 209476 | AV_WB24(output + 3*channel, | |
212 | aptxhd_pack_codeword(&ctx->channels[channel])); | ||
213 | else | ||
214 | 209476 | AV_WB16(output + 2*channel, | |
215 | aptx_pack_codeword(&ctx->channels[channel])); | ||
216 | } | ||
217 | 209476 | } | |
218 | |||
219 | 820 | static int aptx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
220 | const AVFrame *frame, int *got_packet_ptr) | ||
221 | { | ||
222 | 820 | AptXEncContext *const s0 = avctx->priv_data; | |
223 | 820 | AptXContext *const s = &s0->common; | |
224 | int pos, ipos, channel, sample, output_size, ret; | ||
225 | |||
226 |
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820 | if ((ret = ff_af_queue_add(&s0->afq, frame)) < 0) |
227 | ✗ | return ret; | |
228 | |||
229 | 820 | output_size = s->block_size * frame->nb_samples/4; | |
230 |
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820 | if ((ret = ff_get_encode_buffer(avctx, avpkt, output_size, 0)) < 0) |
231 | ✗ | return ret; | |
232 | |||
233 |
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210296 | for (pos = 0, ipos = 0; pos < output_size; pos += s->block_size, ipos += 4) { |
234 | int32_t samples[NB_CHANNELS][4]; | ||
235 | |||
236 |
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628428 | for (channel = 0; channel < NB_CHANNELS; channel++) |
237 |
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2094760 | for (sample = 0; sample < 4; sample++) |
238 | 1675808 | samples[channel][sample] = (int32_t)AV_RN32A(&frame->data[channel][4*(ipos+sample)]) >> 8; | |
239 | |||
240 | 209476 | aptx_encode_samples(s, samples, avpkt->data + pos); | |
241 | } | ||
242 | |||
243 | 820 | ff_af_queue_remove(&s0->afq, frame->nb_samples, &avpkt->pts, &avpkt->duration); | |
244 | 820 | *got_packet_ptr = 1; | |
245 | 820 | return 0; | |
246 | } | ||
247 | |||
248 | 2 | static av_cold int aptx_close(AVCodecContext *avctx) | |
249 | { | ||
250 | 2 | AptXEncContext *const s = avctx->priv_data; | |
251 | 2 | ff_af_queue_close(&s->afq); | |
252 | 2 | return 0; | |
253 | } | ||
254 | |||
255 | 2 | static av_cold int aptx_encode_init(AVCodecContext *avctx) | |
256 | { | ||
257 | 2 | AptXEncContext *const s = avctx->priv_data; | |
258 | |||
259 | 2 | ff_af_queue_init(avctx, &s->afq); | |
260 | |||
261 |
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2 | if (!avctx->frame_size || avctx->frame_size % 4) |
262 | 2 | avctx->frame_size = 1024; | |
263 | 2 | avctx->internal->pad_samples = 4; | |
264 | |||
265 | 2 | return ff_aptx_init(avctx); | |
266 | } | ||
267 | |||
268 | #if CONFIG_APTX_ENCODER | ||
269 | const FFCodec ff_aptx_encoder = { | ||
270 | .p.name = "aptx", | ||
271 | CODEC_LONG_NAME("aptX (Audio Processing Technology for Bluetooth)"), | ||
272 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
273 | .p.id = AV_CODEC_ID_APTX, | ||
274 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
275 | .priv_data_size = sizeof(AptXEncContext), | ||
276 | .init = aptx_encode_init, | ||
277 | FF_CODEC_ENCODE_CB(aptx_encode_frame), | ||
278 | .close = aptx_close, | ||
279 | .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_STEREO, { 0 } }, | ||
280 | .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P, | ||
281 | AV_SAMPLE_FMT_NONE }, | ||
282 | .p.supported_samplerates = (const int[]) {8000, 16000, 24000, 32000, 44100, 48000, 0}, | ||
283 | }; | ||
284 | #endif | ||
285 | |||
286 | #if CONFIG_APTX_HD_ENCODER | ||
287 | const FFCodec ff_aptx_hd_encoder = { | ||
288 | .p.name = "aptx_hd", | ||
289 | CODEC_LONG_NAME("aptX HD (Audio Processing Technology for Bluetooth)"), | ||
290 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
291 | .p.id = AV_CODEC_ID_APTX_HD, | ||
292 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
293 | .priv_data_size = sizeof(AptXEncContext), | ||
294 | .init = aptx_encode_init, | ||
295 | FF_CODEC_ENCODE_CB(aptx_encode_frame), | ||
296 | .close = aptx_close, | ||
297 | .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_STEREO, { 0 } }, | ||
298 | .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P, | ||
299 | AV_SAMPLE_FMT_NONE }, | ||
300 | .p.supported_samplerates = (const int[]) {8000, 16000, 24000, 32000, 44100, 48000, 0}, | ||
301 | }; | ||
302 | #endif | ||
303 |