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105 lines
3.3 KiB
105 lines
3.3 KiB
13 years ago
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/*
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* Copyright (c) 2011 Justin Ruggles
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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* ADX audio parser
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*
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* Reads header to extradata and splits packets into individual blocks.
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*/
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#include "libavutil/intreadwrite.h"
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#include "parser.h"
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#include "adx.h"
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typedef struct ADXParseContext {
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ParseContext pc;
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int header_size;
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int block_size;
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int buf_pos;
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} ADXParseContext;
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#define MIN_HEADER_SIZE 24
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static int adx_parse(AVCodecParserContext *s1,
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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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ADXParseContext *s = s1->priv_data;
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ParseContext *pc = &s->pc;
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int next = END_NOT_FOUND;
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if (!avctx->extradata_size) {
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int ret;
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ff_combine_frame(pc, END_NOT_FOUND, &buf, &buf_size);
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if (!s->header_size && pc->index >= MIN_HEADER_SIZE) {
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if (ret = ff_adx_decode_header(avctx, pc->buffer, pc->index,
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&s->header_size, NULL))
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return AVERROR_INVALIDDATA;
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s->block_size = BLOCK_SIZE * avctx->channels;
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}
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if (s->header_size && s->header_size <= pc->index) {
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avctx->extradata = av_mallocz(s->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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avctx->extradata_size = s->header_size;
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memcpy(avctx->extradata, pc->buffer, s->header_size);
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memmove(pc->buffer, pc->buffer + s->header_size, s->header_size);
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pc->index -= s->header_size;
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}
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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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if (pc->index - s->buf_pos >= s->block_size) {
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*poutbuf = &pc->buffer[s->buf_pos];
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*poutbuf_size = s->block_size;
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s->buf_pos += s->block_size;
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return 0;
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}
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if (pc->index && s->buf_pos) {
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memmove(pc->buffer, &pc->buffer[s->buf_pos], pc->index - s->buf_pos);
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pc->index -= s->buf_pos;
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s->buf_pos = 0;
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}
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if (buf_size + pc->index >= s->block_size)
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next = s->block_size - pc->index;
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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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*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_adx_parser = {
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.codec_ids = { CODEC_ID_ADPCM_ADX },
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.priv_data_size = sizeof(ADXParseContext),
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.parser_parse = adx_parse,
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.parser_close = ff_parse_close,
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};
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