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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * Copyright (c) 2012 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 | * GSM 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/avassert.h" |
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| 29 | #include "parser.h" |
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| 30 | #include "gsm.h" |
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| 31 | |||
| 32 | typedef struct GSMParseContext { |
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| 33 | ParseContext pc; |
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| 34 | int block_size; |
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| 35 | int duration; |
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| 36 | int remaining; |
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| 37 | } GSMParseContext; |
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| 38 | |||
| 39 | static int gsm_parse(AVCodecParserContext *s1, AVCodecContext *avctx, |
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| 40 | const uint8_t **poutbuf, int *poutbuf_size, |
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| 41 | const uint8_t *buf, int buf_size) |
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| 42 | { |
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| 43 | GSMParseContext *s = s1->priv_data; |
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| 44 | ParseContext *pc = &s->pc; |
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| 45 | int next; |
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| 46 | |||
| 47 | if (!s->block_size) { |
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| 48 | switch (avctx->codec_id) { |
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| 49 | case AV_CODEC_ID_GSM: |
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| 50 | s->block_size = GSM_BLOCK_SIZE; |
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| 51 | s->duration = GSM_FRAME_SIZE; |
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| 52 | break; |
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| 53 | case AV_CODEC_ID_GSM_MS: |
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| 54 | s->block_size = avctx->block_align ? avctx->block_align |
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| 55 | : GSM_MS_BLOCK_SIZE; |
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| 56 | s->duration = GSM_FRAME_SIZE * 2; |
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| 57 | break; |
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| 58 | default: |
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| 59 | av_assert0(0); |
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| 60 | } |
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| 61 | } |
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| 62 | |||
| 63 | if (!s->remaining) |
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| 64 | s->remaining = s->block_size; |
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| 65 | if (s->remaining <= buf_size) { |
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| 66 | next = s->remaining; |
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| 67 | s->remaining = 0; |
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| 68 | } else { |
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| 69 | next = END_NOT_FOUND; |
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| 70 | s->remaining -= buf_size; |
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| 71 | } |
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| 72 | |||
| 73 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { |
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| 74 | *poutbuf = NULL; |
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| 75 | *poutbuf_size = 0; |
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| 76 | return buf_size; |
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| 77 | } |
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| 78 | |||
| 79 | s1->duration = s->duration; |
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| 80 | |||
| 81 | *poutbuf = buf; |
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| 82 | *poutbuf_size = buf_size; |
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| 83 | return next; |
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| 84 | } |
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| 85 | |||
| 86 | AVCodecParser ff_gsm_parser = { |
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| 87 | .codec_ids = { AV_CODEC_ID_GSM, AV_CODEC_ID_GSM_MS }, |
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| 88 | .priv_data_size = sizeof(GSMParseContext), |
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| 89 | .parser_parse = gsm_parse, |
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| 90 | .parser_close = ff_parse_close, |
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| 91 | }; |