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93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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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 "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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// channels > 2 is invalid, we pass the packet on unchanged
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if (avctx->ch_layout.nb_channels > 2)
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s->block_size = 0;
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s->block_size *= avctx->ch_layout.nb_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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const 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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};
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