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1 /*
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2 * DNxHD/VC-3 parser
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3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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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
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22 /**
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23 * @file
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24 * DNxHD/VC-3 parser
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25 */
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26
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27 #include "parser.h"
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28
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29 #define DNXHD_HEADER_PREFIX 0x000002800100
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30
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31 typedef struct {
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32 ParseContext pc;
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33 int interlaced;
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34 int cur_field; /* first field is 0, second is 1 */
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35 } DNXHDParserContext;
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36
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37 static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
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38 const uint8_t *buf, int buf_size)
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39 {
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40 ParseContext *pc = &dctx->pc;
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41 uint64_t state = pc->state64;
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42 int pic_found = pc->frame_start_found;
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43 int i = 0;
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44 int interlaced = dctx->interlaced;
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45 int cur_field = dctx->cur_field;
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46
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47 if (!pic_found) {
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48 for (i = 0; i < buf_size; i++) {
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49 state = (state<<8) | buf[i];
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50 if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
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51 i++;
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52 pic_found = 1;
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53 interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
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54 cur_field = state&1;
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55 break;
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56 }
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57 }
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58 }
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59
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60 if (pic_found) {
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61 if (!buf_size) /* EOF considered as end of frame */
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62 return 0;
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63 for (; i < buf_size; i++) {
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64 state = (state<<8) | buf[i];
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65 if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
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66 if (!interlaced || dctx->cur_field) {
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67 pc->frame_start_found = 0;
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68 pc->state64 = -1;
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69 dctx->interlaced = interlaced;
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70 dctx->cur_field = 0;
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71 return i-5;
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72 } else {
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73 /* continue, to get the second field */
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74 dctx->interlaced = interlaced = (state&2)>>1;
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75 dctx->cur_field = cur_field = state&1;
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76 }
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77 }
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78 }
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79 }
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80 pc->frame_start_found = pic_found;
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81 pc->state64 = state;
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82 dctx->interlaced = interlaced;
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83 dctx->cur_field = cur_field;
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84 return END_NOT_FOUND;
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85 }
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86
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87 static int dnxhd_parse(AVCodecParserContext *s,
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88 AVCodecContext *avctx,
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89 const uint8_t **poutbuf, int *poutbuf_size,
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90 const uint8_t *buf, int buf_size)
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91 {
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92 DNXHDParserContext *dctx = s->priv_data;
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93 ParseContext *pc = &dctx->pc;
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94 int next;
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95
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96 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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97 next = buf_size;
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98 } else {
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99 next = dnxhd_find_frame_end(dctx, buf, buf_size);
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100 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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101 *poutbuf = NULL;
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102 *poutbuf_size = 0;
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103 return buf_size;
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104 }
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105 }
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106 *poutbuf = buf;
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107 *poutbuf_size = buf_size;
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108 return next;
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109 }
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110
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111 AVCodecParser ff_dnxhd_parser = {
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112 .codec_ids = { AV_CODEC_ID_DNXHD },
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113 .priv_data_size = sizeof(DNXHDParserContext),
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114 .parser_parse = dnxhd_parse,
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115 .parser_close = ff_parse_close,
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116 };
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