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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2011 Justin Ruggles |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * ADX audio parser |
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24 | * |
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25 | * Splits packets into individual blocks. |
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26 | */ |
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27 | |||
28 | #include "libavutil/intreadwrite.h" |
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29 | #include "parser.h" |
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30 | #include "adx.h" |
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31 | |||
32 | typedef struct ADXParseContext { |
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33 | ParseContext pc; |
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34 | int header_size; |
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35 | int block_size; |
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36 | int remaining; |
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37 | } ADXParseContext; |
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38 | |||
39 | static int adx_parse(AVCodecParserContext *s1, |
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40 | AVCodecContext *avctx, |
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41 | const uint8_t **poutbuf, int *poutbuf_size, |
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42 | const uint8_t *buf, int buf_size) |
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43 | { |
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44 | ADXParseContext *s = s1->priv_data; |
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45 | ParseContext *pc = &s->pc; |
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46 | int next = END_NOT_FOUND; |
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47 | int i; |
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48 | uint64_t state = pc->state64; |
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49 | |||
50 | if (!s->header_size) { |
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51 | for (i = 0; i < buf_size; i++) { |
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52 | state = (state << 8) | buf[i]; |
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53 | /* check for fixed fields in ADX header for possible match */ |
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54 | if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) { |
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55 | int channels = state & 0xFF; |
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56 | int header_size = ((state >> 32) & 0xFFFF) + 4; |
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57 | if (channels > 0 && header_size >= 8) { |
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58 | s->header_size = header_size; |
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59 | s->block_size = BLOCK_SIZE * channels; |
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60 | s->remaining = i - 7 + s->header_size + s->block_size; |
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61 | break; |
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62 | } |
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63 | } |
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64 | } |
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65 | pc->state64 = state; |
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66 | } |
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67 | |||
68 | if (s->header_size) { |
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69 | if (!s->remaining) |
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70 | s->remaining = s->block_size; |
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71 | if (s->remaining <= buf_size) { |
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72 | next = s->remaining; |
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73 | s->remaining = 0; |
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74 | } else |
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75 | s->remaining -= buf_size; |
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76 | } |
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77 | |||
78 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { |
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79 | *poutbuf = NULL; |
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80 | *poutbuf_size = 0; |
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81 | return buf_size; |
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82 | } |
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83 | |||
84 | s1->duration = BLOCK_SAMPLES; |
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85 | |||
86 | *poutbuf = buf; |
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87 | *poutbuf_size = buf_size; |
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88 | return next; |
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89 | } |
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90 | |||
91 | AVCodecParser ff_adx_parser = { |
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92 | .codec_ids = { AV_CODEC_ID_ADPCM_ADX }, |
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93 | .priv_data_size = sizeof(ADXParseContext), |
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94 | .parser_parse = adx_parse, |
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95 | .parser_close = ff_parse_close, |
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96 | };>=>><>> |