Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/ralf.c |
Date: | 2022-07-07 01:21:54 |
Exec | Total | Coverage | |
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Lines: | 239 | 287 | 83.3% |
Branches: | 123 | 168 | 73.2% |
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1 | /* | ||
2 | * RealAudio Lossless decoder | ||
3 | * | ||
4 | * Copyright (c) 2012 Konstantin Shishkov | ||
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 | /** | ||
24 | * @file | ||
25 | * This is a decoder for Real Audio Lossless format. | ||
26 | * Dedicated to the mastermind behind it, Ralph Wiggum. | ||
27 | */ | ||
28 | |||
29 | #include "libavutil/attributes.h" | ||
30 | #include "libavutil/channel_layout.h" | ||
31 | #include "avcodec.h" | ||
32 | #include "codec_internal.h" | ||
33 | #include "get_bits.h" | ||
34 | #include "golomb.h" | ||
35 | #include "internal.h" | ||
36 | #include "unary.h" | ||
37 | #include "ralfdata.h" | ||
38 | |||
39 | #define FILTER_NONE 0 | ||
40 | #define FILTER_RAW 642 | ||
41 | |||
42 | typedef struct VLCSet { | ||
43 | VLC filter_params; | ||
44 | VLC bias; | ||
45 | VLC coding_mode; | ||
46 | VLC filter_coeffs[10][11]; | ||
47 | VLC short_codes[15]; | ||
48 | VLC long_codes[125]; | ||
49 | } VLCSet; | ||
50 | |||
51 | #define RALF_MAX_PKT_SIZE 8192 | ||
52 | |||
53 | typedef struct RALFContext { | ||
54 | int version; | ||
55 | int max_frame_size; | ||
56 | VLCSet sets[3]; | ||
57 | int32_t channel_data[2][4096]; | ||
58 | |||
59 | int filter_params; ///< combined filter parameters for the current channel data | ||
60 | int filter_length; ///< length of the filter for the current channel data | ||
61 | int filter_bits; ///< filter precision for the current channel data | ||
62 | int32_t filter[64]; | ||
63 | |||
64 | unsigned bias[2]; ///< a constant value added to channel data after filtering | ||
65 | |||
66 | int num_blocks; ///< number of blocks inside the frame | ||
67 | int sample_offset; | ||
68 | int block_size[1 << 12]; ///< size of the blocks | ||
69 | int block_pts[1 << 12]; ///< block start time (in milliseconds) | ||
70 | |||
71 | uint8_t pkt[16384]; | ||
72 | int has_pkt; | ||
73 | } RALFContext; | ||
74 | |||
75 | #define MAX_ELEMS 644 // no RALF table uses more than that | ||
76 | |||
77 | 1518 | static av_cold int init_ralf_vlc(VLC *vlc, const uint8_t *data, int elems) | |
78 | { | ||
79 | uint8_t lens[MAX_ELEMS]; | ||
80 | uint16_t codes[MAX_ELEMS]; | ||
81 | int counts[17], prefixes[18]; | ||
82 | int i, cur_len; | ||
83 | 1518 | int max_bits = 0; | |
84 | 1518 | int nb = 0; | |
85 | |||
86 |
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27324 | for (i = 0; i <= 16; i++) |
87 | 25806 | counts[i] = 0; | |
88 |
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382086 | for (i = 0; i < elems; i++) { |
89 |
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380568 | cur_len = (nb ? *data & 0xF : *data >> 4) + 1; |
90 | 380568 | counts[cur_len]++; | |
91 | 380568 | max_bits = FFMAX(max_bits, cur_len); | |
92 | 380568 | lens[i] = cur_len; | |
93 | 380568 | data += nb; | |
94 | 380568 | nb ^= 1; | |
95 | } | ||
96 | 1518 | prefixes[1] = 0; | |
97 |
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25806 | for (i = 1; i <= 16; i++) |
98 | 24288 | prefixes[i + 1] = (prefixes[i] + counts[i]) << 1; | |
99 | |||
100 |
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382086 | for (i = 0; i < elems; i++) |
101 | 380568 | codes[i] = prefixes[lens[i]]++; | |
102 | |||
103 | 1518 | return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), elems, | |
104 | lens, 1, 1, codes, 2, 2, NULL, 0, 0, 0); | ||
105 | } | ||
106 | |||
107 | 2 | static av_cold int decode_close(AVCodecContext *avctx) | |
108 | { | ||
109 | 2 | RALFContext *ctx = avctx->priv_data; | |
110 | int i, j, k; | ||
111 | |||
112 |
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8 | for (i = 0; i < 3; i++) { |
113 | 6 | ff_free_vlc(&ctx->sets[i].filter_params); | |
114 | 6 | ff_free_vlc(&ctx->sets[i].bias); | |
115 | 6 | ff_free_vlc(&ctx->sets[i].coding_mode); | |
116 |
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66 | for (j = 0; j < 10; j++) |
117 |
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720 | for (k = 0; k < 11; k++) |
118 | 660 | ff_free_vlc(&ctx->sets[i].filter_coeffs[j][k]); | |
119 |
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96 | for (j = 0; j < 15; j++) |
120 | 90 | ff_free_vlc(&ctx->sets[i].short_codes[j]); | |
121 |
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756 | for (j = 0; j < 125; j++) |
122 | 750 | ff_free_vlc(&ctx->sets[i].long_codes[j]); | |
123 | } | ||
124 | |||
125 | 2 | return 0; | |
126 | } | ||
127 | |||
128 | 2 | static av_cold int decode_init(AVCodecContext *avctx) | |
129 | { | ||
130 | 2 | RALFContext *ctx = avctx->priv_data; | |
131 | int i, j, k; | ||
132 | int ret, channels; | ||
133 | |||
134 |
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2 | if (avctx->extradata_size < 24 || memcmp(avctx->extradata, "LSD:", 4)) { |
135 | ✗ | av_log(avctx, AV_LOG_ERROR, "Extradata is not groovy, dude\n"); | |
136 | ✗ | return AVERROR_INVALIDDATA; | |
137 | } | ||
138 | |||
139 | 2 | ctx->version = AV_RB16(avctx->extradata + 4); | |
140 |
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2 | if (ctx->version != 0x103) { |
141 | ✗ | avpriv_request_sample(avctx, "Unknown version %X", ctx->version); | |
142 | ✗ | return AVERROR_PATCHWELCOME; | |
143 | } | ||
144 | |||
145 | 2 | channels = AV_RB16(avctx->extradata + 8); | |
146 | 2 | avctx->sample_rate = AV_RB32(avctx->extradata + 12); | |
147 |
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2 | if (channels < 1 || channels > 2 |
148 |
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2 | || avctx->sample_rate < 8000 || avctx->sample_rate > 96000) { |
149 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid coding parameters %d Hz %d ch\n", | |
150 | avctx->sample_rate, channels); | ||
151 | ✗ | return AVERROR_INVALIDDATA; | |
152 | } | ||
153 | 2 | avctx->sample_fmt = AV_SAMPLE_FMT_S16P; | |
154 | 2 | av_channel_layout_uninit(&avctx->ch_layout); | |
155 | 2 | av_channel_layout_default(&avctx->ch_layout, channels); | |
156 | |||
157 | 2 | ctx->max_frame_size = AV_RB32(avctx->extradata + 16); | |
158 |
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2 | if (ctx->max_frame_size > (1 << 20) || !ctx->max_frame_size) { |
159 | ✗ | av_log(avctx, AV_LOG_ERROR, "invalid frame size %d\n", | |
160 | ctx->max_frame_size); | ||
161 | } | ||
162 | 2 | ctx->max_frame_size = FFMAX(ctx->max_frame_size, avctx->sample_rate); | |
163 | |||
164 |
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8 | for (i = 0; i < 3; i++) { |
165 | 6 | ret = init_ralf_vlc(&ctx->sets[i].filter_params, filter_param_def[i], | |
166 | FILTERPARAM_ELEMENTS); | ||
167 |
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6 | if (ret < 0) |
168 | ✗ | return ret; | |
169 | 6 | ret = init_ralf_vlc(&ctx->sets[i].bias, bias_def[i], BIAS_ELEMENTS); | |
170 |
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6 | if (ret < 0) |
171 | ✗ | return ret; | |
172 | 6 | ret = init_ralf_vlc(&ctx->sets[i].coding_mode, coding_mode_def[i], | |
173 | CODING_MODE_ELEMENTS); | ||
174 |
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6 | if (ret < 0) |
175 | ✗ | return ret; | |
176 |
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66 | for (j = 0; j < 10; j++) { |
177 |
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720 | for (k = 0; k < 11; k++) { |
178 | 660 | ret = init_ralf_vlc(&ctx->sets[i].filter_coeffs[j][k], | |
179 | 660 | filter_coeffs_def[i][j][k], | |
180 | FILTER_COEFFS_ELEMENTS); | ||
181 |
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660 | if (ret < 0) |
182 | ✗ | return ret; | |
183 | } | ||
184 | } | ||
185 |
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96 | for (j = 0; j < 15; j++) { |
186 | 90 | ret = init_ralf_vlc(&ctx->sets[i].short_codes[j], | |
187 | 90 | short_codes_def[i][j], SHORT_CODES_ELEMENTS); | |
188 |
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90 | if (ret < 0) |
189 | ✗ | return ret; | |
190 | } | ||
191 |
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756 | for (j = 0; j < 125; j++) { |
192 | 750 | ret = init_ralf_vlc(&ctx->sets[i].long_codes[j], | |
193 | 750 | long_codes_def[i][j], LONG_CODES_ELEMENTS); | |
194 |
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750 | if (ret < 0) |
195 | ✗ | return ret; | |
196 | } | ||
197 | } | ||
198 | |||
199 | 2 | return 0; | |
200 | } | ||
201 | |||
202 | 869132 | static inline int extend_code(GetBitContext *gb, int val, int range, int bits) | |
203 | { | ||
204 |
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869132 | if (val == 0) { |
205 | 7368 | val = -range - get_ue_golomb(gb); | |
206 |
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861764 | } else if (val == range * 2) { |
207 | 4328 | val = range + get_ue_golomb(gb); | |
208 | } else { | ||
209 | 857436 | val -= range; | |
210 | } | ||
211 |
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869132 | if (bits) |
212 | 3852 | val = ((unsigned)val << bits) | get_bits(gb, bits); | |
213 | 869132 | return val; | |
214 | } | ||
215 | |||
216 | 430 | static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch, | |
217 | int length, int mode, int bits) | ||
218 | { | ||
219 | int i, t; | ||
220 | int code_params; | ||
221 | 430 | VLCSet *set = ctx->sets + mode; | |
222 | VLC *code_vlc; int range, range2, add_bits; | ||
223 | 430 | int *dst = ctx->channel_data[ch]; | |
224 | |||
225 | 430 | ctx->filter_params = get_vlc2(gb, set->filter_params.table, 9, 2); | |
226 |
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430 | if (ctx->filter_params > 1) { |
227 | 430 | ctx->filter_bits = (ctx->filter_params - 2) >> 6; | |
228 | 430 | ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1; | |
229 | } | ||
230 | |||
231 |
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430 | if (ctx->filter_params == FILTER_RAW) { |
232 | ✗ | for (i = 0; i < length; i++) | |
233 | ✗ | dst[i] = get_bits(gb, bits); | |
234 | ✗ | ctx->bias[ch] = 0; | |
235 | ✗ | return 0; | |
236 | } | ||
237 | |||
238 | 430 | ctx->bias[ch] = get_vlc2(gb, set->bias.table, 9, 2); | |
239 | 430 | ctx->bias[ch] = extend_code(gb, ctx->bias[ch], 127, 4); | |
240 | |||
241 |
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430 | if (ctx->filter_params == FILTER_NONE) { |
242 | ✗ | memset(dst, 0, sizeof(*dst) * length); | |
243 | ✗ | return 0; | |
244 | } | ||
245 | |||
246 |
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430 | if (ctx->filter_params > 1) { |
247 | 430 | int cmode = 0, coeff = 0; | |
248 | 430 | VLC *vlc = set->filter_coeffs[ctx->filter_bits] + 5; | |
249 | |||
250 | 430 | add_bits = ctx->filter_bits; | |
251 | |||
252 |
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3852 | for (i = 0; i < ctx->filter_length; i++) { |
253 | 3422 | t = get_vlc2(gb, vlc[cmode].table, vlc[cmode].bits, 2); | |
254 | 3422 | t = extend_code(gb, t, 21, add_bits); | |
255 |
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3422 | if (!cmode) |
256 | 771 | coeff -= 12U << add_bits; | |
257 | 3422 | coeff = (unsigned)t - coeff; | |
258 | 3422 | ctx->filter[i] = coeff; | |
259 | |||
260 | 3422 | cmode = coeff >> add_bits; | |
261 |
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3422 | if (cmode < 0) { |
262 | 1485 | cmode = -1 - av_log2(-cmode); | |
263 |
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1485 | if (cmode < -5) |
264 | 4 | cmode = -5; | |
265 |
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1937 | } else if (cmode > 0) { |
266 | 1512 | cmode = 1 + av_log2(cmode); | |
267 |
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1512 | if (cmode > 5) |
268 | 2 | cmode = 5; | |
269 | } | ||
270 | } | ||
271 | } | ||
272 | |||
273 | 430 | code_params = get_vlc2(gb, set->coding_mode.table, set->coding_mode.bits, 2); | |
274 |
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430 | if (code_params >= 15) { |
275 | 430 | add_bits = av_clip((code_params / 5 - 3) / 2, 0, 10); | |
276 |
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430 | if (add_bits > 9 && (code_params % 5) != 2) |
277 | ✗ | add_bits--; | |
278 | 430 | range = 10; | |
279 | 430 | range2 = 21; | |
280 | 430 | code_vlc = set->long_codes + (code_params - 15); | |
281 | } else { | ||
282 | ✗ | add_bits = 0; | |
283 | ✗ | range = 6; | |
284 | ✗ | range2 = 13; | |
285 | ✗ | code_vlc = set->short_codes + code_params; | |
286 | } | ||
287 | |||
288 |
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433070 | for (i = 0; i < length; i += 2) { |
289 | int code1, code2; | ||
290 | |||
291 | 432640 | t = get_vlc2(gb, code_vlc->table, code_vlc->bits, 2); | |
292 | 432640 | code1 = t / range2; | |
293 | 432640 | code2 = t % range2; | |
294 | 432640 | dst[i] = extend_code(gb, code1, range, 0) * (1U << add_bits); | |
295 | 432640 | dst[i + 1] = extend_code(gb, code2, range, 0) * (1U << add_bits); | |
296 |
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432640 | if (add_bits) { |
297 | 432640 | dst[i] |= get_bits(gb, add_bits); | |
298 | 432640 | dst[i + 1] |= get_bits(gb, add_bits); | |
299 | } | ||
300 | } | ||
301 | |||
302 | 430 | return 0; | |
303 | } | ||
304 | |||
305 | 430 | static void apply_lpc(RALFContext *ctx, int ch, int length, int bits) | |
306 | { | ||
307 | int i, j, acc; | ||
308 | 430 | int *audio = ctx->channel_data[ch]; | |
309 | 430 | int bias = 1 << (ctx->filter_bits - 1); | |
310 | 430 | int max_clip = (1 << bits) - 1, min_clip = -max_clip - 1; | |
311 | |||
312 |
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865280 | for (i = 1; i < length; i++) { |
313 | 864850 | int flen = FFMIN(ctx->filter_length, i); | |
314 | |||
315 | 864850 | acc = 0; | |
316 |
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8637783 | for (j = 0; j < flen; j++) |
317 | 7772933 | acc += (unsigned)ctx->filter[j] * audio[i - j - 1]; | |
318 |
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864850 | if (acc < 0) { |
319 | 430200 | acc = (acc + bias - 1) >> ctx->filter_bits; | |
320 | 430200 | acc = FFMAX(acc, min_clip); | |
321 | } else { | ||
322 | 434650 | acc = ((unsigned)acc + bias) >> ctx->filter_bits; | |
323 | 434650 | acc = FFMIN(acc, max_clip); | |
324 | } | ||
325 | 864850 | audio[i] += acc; | |
326 | } | ||
327 | 430 | } | |
328 | |||
329 | 215 | static int decode_block(AVCodecContext *avctx, GetBitContext *gb, | |
330 | int16_t *dst0, int16_t *dst1) | ||
331 | { | ||
332 | 215 | RALFContext *ctx = avctx->priv_data; | |
333 | int len, ch, ret; | ||
334 | int dmode, mode[2], bits[2]; | ||
335 | int *ch0, *ch1; | ||
336 | int i; | ||
337 | unsigned int t, t2; | ||
338 | |||
339 | 215 | len = 12 - get_unary(gb, 0, 6); | |
340 | |||
341 |
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215 | if (len <= 7) len ^= 1; // codes for length = 6 and 7 are swapped |
342 | 215 | len = 1 << len; | |
343 | |||
344 |
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215 | if (ctx->sample_offset + len > ctx->max_frame_size) { |
345 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
346 | "Decoder's stomach is crying, it ate too many samples\n"); | ||
347 | ✗ | return AVERROR_INVALIDDATA; | |
348 | } | ||
349 | |||
350 |
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215 | if (avctx->ch_layout.nb_channels > 1) |
351 | 215 | dmode = get_bits(gb, 2) + 1; | |
352 | else | ||
353 | ✗ | dmode = 0; | |
354 | |||
355 | 215 | mode[0] = (dmode == 4) ? 1 : 0; | |
356 |
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215 | mode[1] = (dmode >= 2) ? 2 : 0; |
357 | 215 | bits[0] = 16; | |
358 |
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215 | bits[1] = (mode[1] == 2) ? 17 : 16; |
359 | |||
360 |
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645 | for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) { |
361 |
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430 | if ((ret = decode_channel(ctx, gb, ch, len, mode[ch], bits[ch])) < 0) |
362 | ✗ | return ret; | |
363 |
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430 | if (ctx->filter_params > 1 && ctx->filter_params != FILTER_RAW) { |
364 | 430 | ctx->filter_bits += 3; | |
365 | 430 | apply_lpc(ctx, ch, len, bits[ch]); | |
366 | } | ||
367 |
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430 | if (get_bits_left(gb) < 0) |
368 | ✗ | return AVERROR_INVALIDDATA; | |
369 | } | ||
370 | 215 | ch0 = ctx->channel_data[0]; | |
371 | 215 | ch1 = ctx->channel_data[1]; | |
372 |
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215 | switch (dmode) { |
373 | ✗ | case 0: | |
374 | ✗ | for (i = 0; i < len; i++) | |
375 | ✗ | dst0[i] = ch0[i] + ctx->bias[0]; | |
376 | ✗ | break; | |
377 | 2 | case 1: | |
378 |
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8194 | for (i = 0; i < len; i++) { |
379 | 8192 | dst0[i] = ch0[i] + ctx->bias[0]; | |
380 | 8192 | dst1[i] = ch1[i] + ctx->bias[1]; | |
381 | } | ||
382 | 2 | break; | |
383 | 79 | case 2: | |
384 |
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179535 | for (i = 0; i < len; i++) { |
385 | 179456 | ch0[i] += ctx->bias[0]; | |
386 | 179456 | dst0[i] = ch0[i]; | |
387 | 179456 | dst1[i] = ch0[i] - (ch1[i] + ctx->bias[1]); | |
388 | } | ||
389 | 79 | break; | |
390 | 43 | case 3: | |
391 |
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60715 | for (i = 0; i < len; i++) { |
392 | 60672 | t = ch0[i] + ctx->bias[0]; | |
393 | 60672 | t2 = ch1[i] + ctx->bias[1]; | |
394 | 60672 | dst0[i] = t + t2; | |
395 | 60672 | dst1[i] = t; | |
396 | } | ||
397 | 43 | break; | |
398 | 91 | case 4: | |
399 |
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184411 | for (i = 0; i < len; i++) { |
400 | 184320 | t = ch1[i] + ctx->bias[1]; | |
401 | 184320 | t2 = ((ch0[i] + ctx->bias[0]) * 2) | (t & 1); | |
402 | 184320 | dst0[i] = (int)(t2 + t) / 2; | |
403 | 184320 | dst1[i] = (int)(t2 - t) / 2; | |
404 | } | ||
405 | 91 | break; | |
406 | } | ||
407 | |||
408 | 215 | ctx->sample_offset += len; | |
409 | |||
410 | 215 | return 0; | |
411 | } | ||
412 | |||
413 | 191 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
414 | int *got_frame_ptr, AVPacket *avpkt) | ||
415 | { | ||
416 | 191 | RALFContext *ctx = avctx->priv_data; | |
417 | int16_t *samples0; | ||
418 | int16_t *samples1; | ||
419 | int ret; | ||
420 | GetBitContext gb; | ||
421 | int table_size, table_bytes, i; | ||
422 | const uint8_t *src, *block_pointer; | ||
423 | int src_size; | ||
424 | int bytes_left; | ||
425 | |||
426 |
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191 | if (ctx->has_pkt) { |
427 | 39 | ctx->has_pkt = 0; | |
428 | 39 | table_bytes = (AV_RB16(avpkt->data) + 7) >> 3; | |
429 |
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39 | if (table_bytes + 3 > avpkt->size || avpkt->size > RALF_MAX_PKT_SIZE) { |
430 | ✗ | av_log(avctx, AV_LOG_ERROR, "Wrong packet's breath smells of wrong data!\n"); | |
431 | ✗ | return AVERROR_INVALIDDATA; | |
432 | } | ||
433 |
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39 | if (memcmp(ctx->pkt, avpkt->data, 2 + table_bytes)) { |
434 | ✗ | av_log(avctx, AV_LOG_ERROR, "Wrong packet tails are wrong!\n"); | |
435 | ✗ | return AVERROR_INVALIDDATA; | |
436 | } | ||
437 | |||
438 | 39 | src = ctx->pkt; | |
439 | 39 | src_size = RALF_MAX_PKT_SIZE + avpkt->size; | |
440 | 39 | memcpy(ctx->pkt + RALF_MAX_PKT_SIZE, avpkt->data + 2 + table_bytes, | |
441 | 39 | avpkt->size - 2 - table_bytes); | |
442 | } else { | ||
443 |
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152 | if (avpkt->size == RALF_MAX_PKT_SIZE) { |
444 | 39 | memcpy(ctx->pkt, avpkt->data, avpkt->size); | |
445 | 39 | ctx->has_pkt = 1; | |
446 | 39 | *got_frame_ptr = 0; | |
447 | |||
448 | 39 | return avpkt->size; | |
449 | } | ||
450 | 113 | src = avpkt->data; | |
451 | 113 | src_size = avpkt->size; | |
452 | } | ||
453 | |||
454 | 152 | frame->nb_samples = ctx->max_frame_size; | |
455 |
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152 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
456 | ✗ | return ret; | |
457 | 152 | samples0 = (int16_t *)frame->data[0]; | |
458 | 152 | samples1 = (int16_t *)frame->data[1]; | |
459 | |||
460 |
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152 | if (src_size < 5) { |
461 | ✗ | av_log(avctx, AV_LOG_ERROR, "too short packets are too short!\n"); | |
462 | ✗ | return AVERROR_INVALIDDATA; | |
463 | } | ||
464 | 152 | table_size = AV_RB16(src); | |
465 | 152 | table_bytes = (table_size + 7) >> 3; | |
466 |
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152 | if (src_size < table_bytes + 3) { |
467 | ✗ | av_log(avctx, AV_LOG_ERROR, "short packets are short!\n"); | |
468 | ✗ | return AVERROR_INVALIDDATA; | |
469 | } | ||
470 | 152 | init_get_bits(&gb, src + 2, table_size); | |
471 | 152 | ctx->num_blocks = 0; | |
472 |
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368 | while (get_bits_left(&gb) > 0) { |
473 |
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216 | if (ctx->num_blocks >= FF_ARRAY_ELEMS(ctx->block_size)) |
474 | ✗ | return AVERROR_INVALIDDATA; | |
475 | 216 | ctx->block_size[ctx->num_blocks] = get_bits(&gb, 13 + avctx->ch_layout.nb_channels); | |
476 |
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216 | if (get_bits1(&gb)) { |
477 | 64 | ctx->block_pts[ctx->num_blocks] = get_bits(&gb, 9); | |
478 | } else { | ||
479 | 152 | ctx->block_pts[ctx->num_blocks] = 0; | |
480 | } | ||
481 | 216 | ctx->num_blocks++; | |
482 | } | ||
483 | |||
484 | 152 | block_pointer = src + table_bytes + 2; | |
485 | 152 | bytes_left = src_size - table_bytes - 2; | |
486 | 152 | ctx->sample_offset = 0; | |
487 |
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367 | for (i = 0; i < ctx->num_blocks; i++) { |
488 |
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216 | if (bytes_left < ctx->block_size[i]) { |
489 | 1 | av_log(avctx, AV_LOG_ERROR, "I'm pedaling backwards\n"); | |
490 | 1 | break; | |
491 | } | ||
492 | 215 | init_get_bits(&gb, block_pointer, ctx->block_size[i] * 8); | |
493 |
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215 | if (decode_block(avctx, &gb, samples0 + ctx->sample_offset, |
494 | 215 | samples1 + ctx->sample_offset) < 0) { | |
495 | ✗ | av_log(avctx, AV_LOG_ERROR, "Sir, I got carsick in your office. Not decoding the rest of packet.\n"); | |
496 | ✗ | break; | |
497 | } | ||
498 | 215 | block_pointer += ctx->block_size[i]; | |
499 | 215 | bytes_left -= ctx->block_size[i]; | |
500 | } | ||
501 | |||
502 | 152 | frame->nb_samples = ctx->sample_offset; | |
503 | 152 | *got_frame_ptr = ctx->sample_offset > 0; | |
504 | |||
505 | 152 | return avpkt->size; | |
506 | } | ||
507 | |||
508 | ✗ | static void decode_flush(AVCodecContext *avctx) | |
509 | { | ||
510 | ✗ | RALFContext *ctx = avctx->priv_data; | |
511 | |||
512 | ✗ | ctx->has_pkt = 0; | |
513 | } | ||
514 | |||
515 | |||
516 | const FFCodec ff_ralf_decoder = { | ||
517 | .p.name = "ralf", | ||
518 | .p.long_name = NULL_IF_CONFIG_SMALL("RealAudio Lossless"), | ||
519 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
520 | .p.id = AV_CODEC_ID_RALF, | ||
521 | .priv_data_size = sizeof(RALFContext), | ||
522 | .init = decode_init, | ||
523 | .close = decode_close, | ||
524 | FF_CODEC_DECODE_CB(decode_frame), | ||
525 | .flush = decode_flush, | ||
526 | .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | | ||
527 | AV_CODEC_CAP_DR1, | ||
528 | .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, | ||
529 | AV_SAMPLE_FMT_NONE }, | ||
530 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, | ||
531 | }; | ||
532 |