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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * TAK parser |
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3 | * Copyright (c) 2012 Michael Niedermayer |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * TAK parser |
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25 | **/ |
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26 | |||
27 | #include "tak.h" |
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28 | #include "parser.h" |
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29 | |||
30 | typedef struct TAKParseContext { |
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31 | ParseContext pc; |
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32 | TAKStreamInfo ti; |
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33 | int index; |
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34 | } TAKParseContext; |
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35 | |||
36 | static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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37 | const uint8_t **poutbuf, int *poutbuf_size, |
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38 | const uint8_t *buf, int buf_size) |
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39 | { |
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40 | TAKParseContext *t = s->priv_data; |
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41 | ParseContext *pc = &t->pc; |
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42 | int next = END_NOT_FOUND; |
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43 | GetBitContext gb; |
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44 | int consumed = 0; |
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45 | int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8; |
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46 | |||
47 | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
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48 | TAKStreamInfo ti; |
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49 | init_get_bits(&gb, buf, buf_size); |
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50 | if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127)) |
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51 | s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples |
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52 | : t->ti.frame_samples; |
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53 | *poutbuf = buf; |
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54 | *poutbuf_size = buf_size; |
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55 | return buf_size; |
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56 | } |
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57 | |||
58 | while (buf_size || t->index + needed <= pc->index) { |
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59 | if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) { |
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60 | int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES, |
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61 | buf_size); |
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62 | const uint8_t *tmp_buf = buf; |
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63 | |||
64 | if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1) |
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65 | return AVERROR(ENOMEM); |
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66 | consumed += tmp_buf_size; |
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67 | buf += tmp_buf_size; |
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68 | buf_size -= tmp_buf_size; |
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69 | } |
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70 | |||
71 | for (; t->index + needed <= pc->index; t->index++) { |
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72 | if (pc->buffer[ t->index ] == 0xFF && |
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73 | pc->buffer[ t->index + 1 ] == 0xA0) { |
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74 | TAKStreamInfo ti; |
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75 | |||
76 | init_get_bits(&gb, pc->buffer + t->index, |
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77 | 8 * (pc->index - t->index)); |
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78 | if (!ff_tak_decode_frame_header(avctx, &gb, |
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79 | pc->frame_start_found ? &ti : &t->ti, 127) && |
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80 | !ff_tak_check_crc(pc->buffer + t->index, |
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81 | get_bits_count(&gb) / 8)) { |
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82 | if (!pc->frame_start_found) { |
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83 | pc->frame_start_found = 1; |
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84 | s->duration = t->ti.last_frame_samples ? |
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85 | t->ti.last_frame_samples : |
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86 | t->ti.frame_samples; |
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87 | s->key_frame = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO); |
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88 | } else { |
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89 | pc->frame_start_found = 0; |
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90 | next = t->index - pc->index; |
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91 | t->index = 0; |
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92 | goto found; |
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93 | } |
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94 | } |
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95 | } |
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96 | } |
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97 | } |
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98 | found: |
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99 | |||
100 | if (consumed && !buf_size && next == END_NOT_FOUND || |
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101 | ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
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102 | *poutbuf = NULL; |
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103 | *poutbuf_size = 0; |
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104 | return buf_size + consumed; |
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105 | } |
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106 | |||
107 | if (next != END_NOT_FOUND) { |
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108 | next += consumed; |
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109 | pc->overread = FFMAX(0, -next); |
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110 | } |
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111 | |||
112 | *poutbuf = buf; |
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113 | *poutbuf_size = buf_size; |
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114 | return next; |
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115 | } |
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116 | |||
117 | AVCodecParser ff_tak_parser = { |
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118 | .codec_ids = { AV_CODEC_ID_TAK }, |
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119 | .priv_data_size = sizeof(TAKParseContext), |
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120 | .parser_parse = tak_parse, |
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121 | .parser_close = ff_parse_close, |
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122 | };>=>=> |