| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 |
2/2✓ Branch 0 taken 3351616 times.
✓ Branch 1 taken 1675808 times.
|
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 |
2/2✓ Branch 0 taken 837904 times.
✓ Branch 1 taken 418952 times.
|
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 |
2/2✓ Branch 0 taken 837904 times.
✓ Branch 1 taken 418952 times.
|
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 |
2/2✓ Branch 0 taken 6703232 times.
✓ Branch 1 taken 1675808 times.
|
8379040 | for (i = nb_intervals >> 1; i > 0; i >>= 1) |
| 101 |
2/2✓ Branch 0 taken 2573224 times.
✓ Branch 1 taken 4130008 times.
|
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 |
2/2✓ Branch 1 taken 878803 times.
✓ Branch 2 taken 797005 times.
|
1675808 | quantize->error = FFABS(rshift64(error, 23)); |
| 135 | |||
| 136 | 1675808 | parity_change = quantized_sample; | |
| 137 |
2/2✓ Branch 0 taken 801351 times.
✓ Branch 1 taken 874457 times.
|
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 |
2/2✓ Branch 0 taken 1675808 times.
✓ Branch 1 taken 418952 times.
|
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 |
2/2✓ Branch 1 taken 105071 times.
✓ Branch 2 taken 104405 times.
|
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 |
2/2✓ Branch 0 taken 210142 times.
✓ Branch 1 taken 105071 times.
|
315213 | for (c = &channels[NB_CHANNELS-1]; c >= channels; c--) |
| 170 |
2/2✓ Branch 0 taken 840568 times.
✓ Branch 1 taken 210142 times.
|
1050710 | for (i = 0; i < NB_SUBBANDS; i++) |
| 171 |
2/2✓ Branch 0 taken 199417 times.
✓ Branch 1 taken 641151 times.
|
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 |
2/2✓ Branch 0 taken 418952 times.
✓ Branch 1 taken 209476 times.
|
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 |
2/2✓ Branch 0 taken 418952 times.
✓ Branch 1 taken 209476 times.
|
628428 | for (channel = 0; channel < NB_CHANNELS; channel++) { |
| 209 | 418952 | ff_aptx_invert_quantize_and_prediction(&ctx->channels[channel], ctx->hd); | |
| 210 |
2/2✓ Branch 0 taken 209476 times.
✓ Branch 1 taken 209476 times.
|
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 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 820 times.
|
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 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 820 times.
|
820 | if ((ret = ff_get_encode_buffer(avctx, avpkt, output_size, 0)) < 0) |
| 231 | ✗ | return ret; | |
| 232 | |||
| 233 |
2/2✓ Branch 0 taken 209476 times.
✓ Branch 1 taken 820 times.
|
210296 | for (pos = 0, ipos = 0; pos < output_size; pos += s->block_size, ipos += 4) { |
| 234 | int32_t samples[NB_CHANNELS][4]; | ||
| 235 | |||
| 236 |
2/2✓ Branch 0 taken 418952 times.
✓ Branch 1 taken 209476 times.
|
628428 | for (channel = 0; channel < NB_CHANNELS; channel++) |
| 237 |
2/2✓ Branch 0 taken 1675808 times.
✓ Branch 1 taken 418952 times.
|
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 |
1/4✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
|
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 | CODEC_CH_LAYOUTS(AV_CHANNEL_LAYOUT_STEREO), | ||
| 280 | CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S32P), | ||
| 281 | CODEC_SAMPLERATES(8000, 16000, 24000, 32000, 44100, 48000), | ||
| 282 | }; | ||
| 283 | #endif | ||
| 284 | |||
| 285 | #if CONFIG_APTX_HD_ENCODER | ||
| 286 | const FFCodec ff_aptx_hd_encoder = { | ||
| 287 | .p.name = "aptx_hd", | ||
| 288 | CODEC_LONG_NAME("aptX HD (Audio Processing Technology for Bluetooth)"), | ||
| 289 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
| 290 | .p.id = AV_CODEC_ID_APTX_HD, | ||
| 291 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
| 292 | .priv_data_size = sizeof(AptXEncContext), | ||
| 293 | .init = aptx_encode_init, | ||
| 294 | FF_CODEC_ENCODE_CB(aptx_encode_frame), | ||
| 295 | .close = aptx_close, | ||
| 296 | CODEC_CH_LAYOUTS(AV_CHANNEL_LAYOUT_STEREO), | ||
| 297 | CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S32P), | ||
| 298 | CODEC_SAMPLERATES(8000, 16000, 24000, 32000, 44100, 48000), | ||
| 299 | }; | ||
| 300 | #endif | ||
| 301 |