| /* |
| * Copyright (c) 2015 Ganesh Ajjanagadde |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * G.729 audio parser |
| * |
| * Splits packets into individual blocks. |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "parser.h" |
| #include "g729.h" |
| |
| typedef struct G729ParseContext { |
| ParseContext pc; |
| int block_size; |
| int duration; |
| int remaining; |
| } G729ParseContext; |
| |
| static int g729_parse(AVCodecParserContext *s1, AVCodecContext *avctx, |
| const uint8_t **poutbuf, int *poutbuf_size, |
| const uint8_t *buf, int buf_size) |
| { |
| G729ParseContext *s = s1->priv_data; |
| ParseContext *pc = &s->pc; |
| int next; |
| |
| if (!s->block_size) { |
| av_assert1(avctx->codec_id == AV_CODEC_ID_G729); |
| /* FIXME: replace this heuristic block_size with more precise estimate */ |
| s->block_size = (avctx->bit_rate < 8000) ? G729D_6K4_BLOCK_SIZE : G729_8K_BLOCK_SIZE; |
| s->block_size *= avctx->channels; |
| s->duration = avctx->frame_size; |
| } |
| |
| if (!s->remaining) |
| s->remaining = s->block_size; |
| if (s->remaining <= buf_size) { |
| next = s->remaining; |
| s->remaining = 0; |
| } else { |
| next = END_NOT_FOUND; |
| s->remaining -= buf_size; |
| } |
| |
| if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { |
| *poutbuf = NULL; |
| *poutbuf_size = 0; |
| return buf_size; |
| } |
| |
| s1->duration = s->duration; |
| |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| return next; |
| } |
| |
| AVCodecParser ff_g729_parser = { |
| .codec_ids = { AV_CODEC_ID_G729 }, |
| .priv_data_size = sizeof(G729ParseContext), |
| .parser_parse = g729_parse, |
| .parser_close = ff_parse_close, |
| }; |