| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2015 Ganesh Ajjanagadde | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | /** | ||
| 22 | * @file | ||
| 23 | * G.729 audio parser | ||
| 24 | * | ||
| 25 | * Splits packets into individual blocks. | ||
| 26 | */ | ||
| 27 | |||
| 28 | #include "parser.h" | ||
| 29 | #include "g729.h" | ||
| 30 | |||
| 31 | typedef struct G729ParseContext { | ||
| 32 | ParseContext pc; | ||
| 33 | int block_size; | ||
| 34 | int duration; | ||
| 35 | int remaining; | ||
| 36 | } G729ParseContext; | ||
| 37 | |||
| 38 | ✗ | static int g729_parse(AVCodecParserContext *s1, AVCodecContext *avctx, | |
| 39 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 40 | const uint8_t *buf, int buf_size) | ||
| 41 | { | ||
| 42 | ✗ | G729ParseContext *s = s1->priv_data; | |
| 43 | ✗ | ParseContext *pc = &s->pc; | |
| 44 | int next; | ||
| 45 | |||
| 46 | ✗ | if (!s->block_size) { | |
| 47 | /* FIXME: replace this heuristic block_size with more precise estimate */ | ||
| 48 | ✗ | s->block_size = (avctx->bit_rate < 8000) ? G729D_6K4_BLOCK_SIZE : G729_8K_BLOCK_SIZE; | |
| 49 | ✗ | if (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN) | |
| 50 | ✗ | s->block_size++; | |
| 51 | // channels > 2 is invalid, we pass the packet on unchanged | ||
| 52 | ✗ | if (avctx->ch_layout.nb_channels > 2) | |
| 53 | ✗ | s->block_size = 0; | |
| 54 | ✗ | s->block_size *= avctx->ch_layout.nb_channels; | |
| 55 | ✗ | s->duration = avctx->frame_size; | |
| 56 | } | ||
| 57 | |||
| 58 | ✗ | if (!s->block_size) { | |
| 59 | ✗ | *poutbuf = buf; | |
| 60 | ✗ | *poutbuf_size = buf_size; | |
| 61 | ✗ | return buf_size; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | if (!s->remaining) | |
| 65 | ✗ | s->remaining = s->block_size; | |
| 66 | ✗ | if (s->remaining <= buf_size) { | |
| 67 | ✗ | next = s->remaining; | |
| 68 | ✗ | s->remaining = 0; | |
| 69 | } else { | ||
| 70 | ✗ | next = END_NOT_FOUND; | |
| 71 | ✗ | s->remaining -= buf_size; | |
| 72 | } | ||
| 73 | |||
| 74 | ✗ | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { | |
| 75 | ✗ | *poutbuf = NULL; | |
| 76 | ✗ | *poutbuf_size = 0; | |
| 77 | ✗ | return buf_size; | |
| 78 | } | ||
| 79 | |||
| 80 | ✗ | s1->duration = s->duration; | |
| 81 | |||
| 82 | ✗ | *poutbuf = buf; | |
| 83 | ✗ | *poutbuf_size = buf_size; | |
| 84 | ✗ | return next; | |
| 85 | } | ||
| 86 | |||
| 87 | const AVCodecParser ff_g729_parser = { | ||
| 88 | .codec_ids = { AV_CODEC_ID_G729, AV_CODEC_ID_ACELP_KELVIN }, | ||
| 89 | .priv_data_size = sizeof(G729ParseContext), | ||
| 90 | .parser_parse = g729_parse, | ||
| 91 | .parser_close = ff_parse_close, | ||
| 92 | }; | ||
| 93 |