GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/sbc_parser.c Lines: 0 51 0.0 %
Date: 2021-04-22 14:24:15 Branches: 0 26 0.0 %

Line Branch Exec Source
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/*
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 * SBC parser
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 *
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 * Copyright (C) 2017  Aurelien Jacobs <aurel@gnuage.org>
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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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#include "sbc.h"
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#include "parser.h"
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typedef struct SBCParseContext {
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    ParseContext pc;
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    uint8_t header[3];
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    int header_size;
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    int buffered_size;
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} SBCParseContext;
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static int sbc_parse_header(AVCodecParserContext *s, AVCodecContext *avctx,
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                            const uint8_t *data, size_t len)
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{
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    static const int sample_rates[4] = { 16000, 32000, 44100, 48000 };
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    int sr, blocks, mode, subbands, bitpool, channels, joint;
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    int length;
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    if (len < 3)
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        return -1;
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    if (data[0] == MSBC_SYNCWORD && data[1] == 0 && data[2] == 0) {
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        avctx->channels = 1;
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        avctx->sample_rate = 16000;
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        avctx->frame_size = 120;
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        s->duration = avctx->frame_size;
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        return 57;
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    }
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    if (data[0] != SBC_SYNCWORD)
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        return -2;
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    sr       =   (data[1] >> 6) & 0x03;
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    blocks   = (((data[1] >> 4) & 0x03) + 1) << 2;
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    mode     =   (data[1] >> 2) & 0x03;
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    subbands = (((data[1] >> 0) & 0x01) + 1) << 2;
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    bitpool  = data[2];
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    channels = mode == SBC_MODE_MONO ? 1 : 2;
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    joint    = mode == SBC_MODE_JOINT_STEREO;
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    length = 4 + (subbands * channels) / 2
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             + ((((mode == SBC_MODE_DUAL_CHANNEL) + 1) * blocks * bitpool
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                 + (joint * subbands)) + 7) / 8;
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    avctx->channels = channels;
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    avctx->sample_rate = sample_rates[sr];
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    avctx->frame_size = subbands * blocks;
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    s->duration = avctx->frame_size;
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    return length;
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}
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static int sbc_parse(AVCodecParserContext *s, 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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    SBCParseContext *pc = s->priv_data;
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    int next;
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    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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        next = buf_size;
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    } else {
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        if (pc->header_size) {
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            memcpy(pc->header + pc->header_size, buf,
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                   sizeof(pc->header) - pc->header_size);
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            next = sbc_parse_header(s, avctx, pc->header, sizeof(pc->header))
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                 - pc->buffered_size;
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            pc->header_size = 0;
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        } else {
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            next = sbc_parse_header(s, avctx, buf, buf_size);
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            if (next >= buf_size)
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                next = -1;
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        }
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        if (next < 0) {
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            pc->header_size = FFMIN(sizeof(pc->header), buf_size);
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            memcpy(pc->header, buf, pc->header_size);
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            pc->buffered_size = buf_size;
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            next = END_NOT_FOUND;
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        }
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        if (ff_combine_frame(&pc->pc, next, &buf, &buf_size) < 0) {
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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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    }
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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_sbc_parser = {
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    .codec_ids      = { AV_CODEC_ID_SBC },
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    .priv_data_size = sizeof(SBCParseContext),
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    .parser_parse   = sbc_parse,
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    .parser_close   = ff_parse_close,
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};