blob: fba25e102867138c741fe721537b725c84296eee
| 1 | /* |
| 2 | * This file is part of FFmpeg. |
| 3 | * |
| 4 | * FFmpeg is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * FFmpeg is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with FFmpeg; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | /** |
| 20 | * @file |
| 21 | * Sipr audio parser |
| 22 | */ |
| 23 | |
| 24 | #include "parser.h" |
| 25 | |
| 26 | typedef struct SiprParserContext{ |
| 27 | ParseContext pc; |
| 28 | } SiprParserContext; |
| 29 | |
| 30 | static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) |
| 31 | { |
| 32 | int next; |
| 33 | |
| 34 | switch (avctx->block_align) { |
| 35 | case 20: |
| 36 | case 19: |
| 37 | case 29: |
| 38 | case 37: next = avctx->block_align; break; |
| 39 | default: |
| 40 | if (avctx->bit_rate > 12200) next = 20; |
| 41 | else if (avctx->bit_rate > 7500 ) next = 19; |
| 42 | else if (avctx->bit_rate > 5750 ) next = 29; |
| 43 | else next = 37; |
| 44 | } |
| 45 | |
| 46 | return FFMIN(next, buf_size); |
| 47 | } |
| 48 | |
| 49 | static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx, |
| 50 | const uint8_t **poutbuf, int *poutbuf_size, |
| 51 | const uint8_t *buf, int buf_size) |
| 52 | { |
| 53 | SiprParserContext *s = s1->priv_data; |
| 54 | ParseContext *pc = &s->pc; |
| 55 | int next; |
| 56 | |
| 57 | next = sipr_split(avctx, buf, buf_size); |
| 58 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
| 59 | *poutbuf = NULL; |
| 60 | *poutbuf_size = 0; |
| 61 | return buf_size; |
| 62 | } |
| 63 | |
| 64 | *poutbuf = buf; |
| 65 | *poutbuf_size = buf_size; |
| 66 | return next; |
| 67 | } |
| 68 | |
| 69 | AVCodecParser ff_sipr_parser = { |
| 70 | .codec_ids = { AV_CODEC_ID_SIPR }, |
| 71 | .priv_data_size = sizeof(SiprParserContext), |
| 72 | .parser_parse = sipr_parse, |
| 73 | .parser_close = ff_parse_close, |
| 74 | }; |
| 75 |