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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | }; |