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