| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) CMU 1993 Computer Science, Speech Group | ||
| 3 | * Chengxiang Lu and Alex Hauptmann | ||
| 4 | * Copyright (c) 2005 Steve Underwood <steveu at coppice.org> | ||
| 5 | * Copyright (c) 2009 Kenan Gillet | ||
| 6 | * Copyright (c) 2010 Martin Storsjo | ||
| 7 | * | ||
| 8 | * This file is part of FFmpeg. | ||
| 9 | * | ||
| 10 | * FFmpeg is free software; you can redistribute it and/or | ||
| 11 | * modify it under the terms of the GNU Lesser General Public | ||
| 12 | * License as published by the Free Software Foundation; either | ||
| 13 | * version 2.1 of the License, or (at your option) any later version. | ||
| 14 | * | ||
| 15 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 18 | * Lesser General Public License for more details. | ||
| 19 | * | ||
| 20 | * You should have received a copy of the GNU Lesser General Public | ||
| 21 | * License along with FFmpeg; if not, write to the Free Software | ||
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 23 | */ | ||
| 24 | |||
| 25 | /** | ||
| 26 | * @file | ||
| 27 | * G.722 ADPCM audio decoder | ||
| 28 | * | ||
| 29 | * This G.722 decoder is a bit-exact implementation of the ITU G.722 | ||
| 30 | * specification for all three specified bitrates - 64000bps, 56000bps | ||
| 31 | * and 48000bps. It passes the ITU tests. | ||
| 32 | * | ||
| 33 | * @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits | ||
| 34 | * respectively of each byte are ignored. | ||
| 35 | */ | ||
| 36 | |||
| 37 | #include "libavutil/channel_layout.h" | ||
| 38 | #include "libavutil/opt.h" | ||
| 39 | #include "avcodec.h" | ||
| 40 | #include "codec_internal.h" | ||
| 41 | #include "decode.h" | ||
| 42 | #include "get_bits.h" | ||
| 43 | #include "g722.h" | ||
| 44 | |||
| 45 | #define OFFSET(x) offsetof(G722Context, x) | ||
| 46 | #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM | ||
| 47 | static const AVOption options[] = { | ||
| 48 | { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_INT, { .i64 = 8 }, 6, 8, AD }, | ||
| 49 | { NULL } | ||
| 50 | }; | ||
| 51 | |||
| 52 | static const AVClass g722_decoder_class = { | ||
| 53 | .class_name = "g722 decoder", | ||
| 54 | .item_name = av_default_item_name, | ||
| 55 | .option = options, | ||
| 56 | .version = LIBAVUTIL_VERSION_INT, | ||
| 57 | }; | ||
| 58 | |||
| 59 | 4 | static av_cold int g722_decode_init(AVCodecContext * avctx) | |
| 60 | { | ||
| 61 | 4 | G722Context *c = avctx->priv_data; | |
| 62 | |||
| 63 | 4 | av_channel_layout_uninit(&avctx->ch_layout); | |
| 64 | 4 | avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 65 | 4 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
| 66 |
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4 | if (!avctx->sample_rate) |
| 67 | ✗ | avctx->sample_rate = 16000; | |
| 68 | |||
| 69 | 4 | c->band[0].scale_factor = 8; | |
| 70 | 4 | c->band[1].scale_factor = 2; | |
| 71 | 4 | c->prev_samples_pos = 22; | |
| 72 | |||
| 73 | 4 | ff_g722dsp_init(&c->dsp); | |
| 74 | |||
| 75 | 4 | return 0; | |
| 76 | } | ||
| 77 | |||
| 78 | static const int16_t low_inv_quant5[32] = { | ||
| 79 | -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, | ||
| 80 | -858, -714, -587, -473, -370, -276, -190, -110, | ||
| 81 | 2919, 2195, 1765, 1458, 1219, 1023, 858, 714, | ||
| 82 | 587, 473, 370, 276, 190, 110, 35, -35 | ||
| 83 | }; | ||
| 84 | |||
| 85 | static const int16_t * const low_inv_quants[3] = { ff_g722_low_inv_quant6, | ||
| 86 | low_inv_quant5, | ||
| 87 | ff_g722_low_inv_quant4 }; | ||
| 88 | |||
| 89 | 263 | static int g722_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 90 | int *got_frame_ptr, AVPacket *avpkt) | ||
| 91 | { | ||
| 92 | 263 | G722Context *c = avctx->priv_data; | |
| 93 | int16_t *out_buf; | ||
| 94 | int j, ret; | ||
| 95 | 263 | const int skip = 8 - c->bits_per_codeword; | |
| 96 | 263 | const int16_t *quantizer_table = low_inv_quants[skip]; | |
| 97 | GetBitContext gb; | ||
| 98 | |||
| 99 | /* get output buffer */ | ||
| 100 | 263 | frame->nb_samples = avpkt->size * 2; | |
| 101 |
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263 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 102 | ✗ | return ret; | |
| 103 | 263 | out_buf = (int16_t *)frame->data[0]; | |
| 104 | |||
| 105 | 263 | ret = init_get_bits8(&gb, avpkt->data, avpkt->size); | |
| 106 |
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263 | if (ret < 0) |
| 107 | ✗ | return ret; | |
| 108 | |||
| 109 |
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220125 | for (j = 0; j < avpkt->size; j++) { |
| 110 | int ilow, ihigh, rlow, rhigh, dhigh; | ||
| 111 | int xout[2]; | ||
| 112 | |||
| 113 | 219862 | ihigh = get_bits(&gb, 2); | |
| 114 | 219862 | ilow = get_bits(&gb, 6 - skip); | |
| 115 | 219862 | skip_bits(&gb, skip); | |
| 116 | |||
| 117 | 219862 | rlow = av_clip_intp2((c->band[0].scale_factor * quantizer_table[ilow] >> 10) | |
| 118 | 219862 | + c->band[0].s_predictor, 14); | |
| 119 | |||
| 120 | 219862 | ff_g722_update_low_predictor(&c->band[0], ilow >> (2 - skip)); | |
| 121 | |||
| 122 | 219862 | dhigh = c->band[1].scale_factor * ff_g722_high_inv_quant[ihigh] >> 10; | |
| 123 | 219862 | rhigh = av_clip_intp2(dhigh + c->band[1].s_predictor, 14); | |
| 124 | |||
| 125 | 219862 | ff_g722_update_high_predictor(&c->band[1], dhigh, ihigh); | |
| 126 | |||
| 127 | 219862 | c->prev_samples[c->prev_samples_pos++] = rlow + rhigh; | |
| 128 | 219862 | c->prev_samples[c->prev_samples_pos++] = rlow - rhigh; | |
| 129 | 219862 | c->dsp.apply_qmf(c->prev_samples + c->prev_samples_pos - 24, xout); | |
| 130 | 219862 | *out_buf++ = av_clip_int16(xout[0] >> 11); | |
| 131 | 219862 | *out_buf++ = av_clip_int16(xout[1] >> 11); | |
| 132 |
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219862 | if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { |
| 133 | 437 | memmove(c->prev_samples, c->prev_samples + c->prev_samples_pos - 22, | |
| 134 | 22 * sizeof(c->prev_samples[0])); | ||
| 135 | 437 | c->prev_samples_pos = 22; | |
| 136 | } | ||
| 137 | } | ||
| 138 | |||
| 139 | 263 | *got_frame_ptr = 1; | |
| 140 | |||
| 141 | 263 | return avpkt->size; | |
| 142 | } | ||
| 143 | |||
| 144 | const FFCodec ff_adpcm_g722_decoder = { | ||
| 145 | .p.name = "g722", | ||
| 146 | CODEC_LONG_NAME("G.722 ADPCM"), | ||
| 147 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
| 148 | .p.id = AV_CODEC_ID_ADPCM_G722, | ||
| 149 | .priv_data_size = sizeof(G722Context), | ||
| 150 | .init = g722_decode_init, | ||
| 151 | FF_CODEC_DECODE_CB(g722_decode_frame), | ||
| 152 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | ||
| 153 | .p.priv_class = &g722_decoder_class, | ||
| 154 | }; | ||
| 155 |