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2ba45a60 DM |
1 | /* |
2 | * Real Audio 1.0 (14.4K) | |
3 | * | |
4 | * Copyright (c) 2008 Vitor Sessak | |
5 | * Copyright (c) 2003 Nick Kurshev | |
6 | * Based on public domain decoder at http://www.honeypot.net/audio | |
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 | #include "libavutil/channel_layout.h" | |
26 | #include "avcodec.h" | |
27 | #include "get_bits.h" | |
28 | #include "internal.h" | |
29 | #include "ra144.h" | |
30 | ||
31 | ||
32 | static av_cold int ra144_decode_init(AVCodecContext * avctx) | |
33 | { | |
34 | RA144Context *ractx = avctx->priv_data; | |
35 | ||
36 | ractx->avctx = avctx; | |
37 | ff_audiodsp_init(&ractx->adsp); | |
38 | ||
39 | ractx->lpc_coef[0] = ractx->lpc_tables[0]; | |
40 | ractx->lpc_coef[1] = ractx->lpc_tables[1]; | |
41 | ||
42 | avctx->channels = 1; | |
43 | avctx->channel_layout = AV_CH_LAYOUT_MONO; | |
44 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static void do_output_subblock(RA144Context *ractx, const int16_t *lpc_coefs, | |
50 | int gval, GetBitContext *gb) | |
51 | { | |
52 | int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none | |
53 | int gain = get_bits(gb, 8); | |
54 | int cb1_idx = get_bits(gb, 7); | |
55 | int cb2_idx = get_bits(gb, 7); | |
56 | ||
57 | ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, gval, | |
58 | gain); | |
59 | } | |
60 | ||
61 | /** Uncompress one block (20 bytes -> 160*2 bytes). */ | |
62 | static int ra144_decode_frame(AVCodecContext * avctx, void *data, | |
63 | int *got_frame_ptr, AVPacket *avpkt) | |
64 | { | |
65 | AVFrame *frame = data; | |
66 | const uint8_t *buf = avpkt->data; | |
67 | int buf_size = avpkt->size; | |
68 | static const uint8_t sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2}; | |
69 | unsigned int refl_rms[NBLOCKS]; // RMS of the reflection coefficients | |
70 | int16_t block_coefs[NBLOCKS][LPC_ORDER]; // LPC coefficients of each sub-block | |
71 | unsigned int lpc_refl[LPC_ORDER]; // LPC reflection coefficients of the frame | |
72 | int i, j; | |
73 | int ret; | |
74 | int16_t *samples; | |
75 | unsigned int energy; | |
76 | ||
77 | RA144Context *ractx = avctx->priv_data; | |
78 | GetBitContext gb; | |
79 | ||
80 | if (buf_size < FRAME_SIZE) { | |
81 | av_log(avctx, AV_LOG_ERROR, | |
82 | "Frame too small (%d bytes). Truncated file?\n", buf_size); | |
83 | *got_frame_ptr = 0; | |
84 | return AVERROR_INVALIDDATA; | |
85 | } | |
86 | ||
87 | /* get output buffer */ | |
88 | frame->nb_samples = NBLOCKS * BLOCKSIZE; | |
89 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
90 | return ret; | |
91 | samples = (int16_t *)frame->data[0]; | |
92 | ||
93 | init_get_bits8(&gb, buf, FRAME_SIZE); | |
94 | ||
95 | for (i = 0; i < LPC_ORDER; i++) | |
96 | lpc_refl[i] = ff_lpc_refl_cb[i][get_bits(&gb, sizes[i])]; | |
97 | ||
98 | ff_eval_coefs(ractx->lpc_coef[0], lpc_refl); | |
99 | ractx->lpc_refl_rms[0] = ff_rms(lpc_refl); | |
100 | ||
101 | energy = ff_energy_tab[get_bits(&gb, 5)]; | |
102 | ||
103 | refl_rms[0] = ff_interp(ractx, block_coefs[0], 1, 1, ractx->old_energy); | |
104 | refl_rms[1] = ff_interp(ractx, block_coefs[1], 2, | |
105 | energy <= ractx->old_energy, | |
106 | ff_t_sqrt(energy*ractx->old_energy) >> 12); | |
107 | refl_rms[2] = ff_interp(ractx, block_coefs[2], 3, 0, energy); | |
108 | refl_rms[3] = ff_rescale_rms(ractx->lpc_refl_rms[0], energy); | |
109 | ||
110 | ff_int_to_int16(block_coefs[3], ractx->lpc_coef[0]); | |
111 | ||
112 | for (i=0; i < NBLOCKS; i++) { | |
113 | do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb); | |
114 | ||
115 | for (j=0; j < BLOCKSIZE; j++) | |
116 | *samples++ = av_clip_int16(ractx->curr_sblock[j + 10] << 2); | |
117 | } | |
118 | ||
119 | ractx->old_energy = energy; | |
120 | ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0]; | |
121 | ||
122 | FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]); | |
123 | ||
124 | *got_frame_ptr = 1; | |
125 | ||
126 | return FRAME_SIZE; | |
127 | } | |
128 | ||
129 | AVCodec ff_ra_144_decoder = { | |
130 | .name = "real_144", | |
131 | .long_name = NULL_IF_CONFIG_SMALL("RealAudio 1.0 (14.4K)"), | |
132 | .type = AVMEDIA_TYPE_AUDIO, | |
133 | .id = AV_CODEC_ID_RA_144, | |
134 | .priv_data_size = sizeof(RA144Context), | |
135 | .init = ra144_decode_init, | |
136 | .decode = ra144_decode_frame, | |
137 | .capabilities = CODEC_CAP_DR1, | |
138 | }; |