GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/opus_parser.c Lines: 68 89 76.4 %
Date: 2019-11-22 03:34:36 Branches: 40 58 69.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2013-2014 Mozilla Corporation
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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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 * Opus parser
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 *
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 * Determines the duration for each packet.
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 */
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#include "avcodec.h"
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#include "bytestream.h"
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#include "opus.h"
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#include "parser.h"
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typedef struct OpusParseContext {
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    ParseContext pc;
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    OpusContext ctx;
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    OpusPacket pkt;
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    int extradata_parsed;
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    int ts_framing;
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} OpusParseContext;
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static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
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{
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765
    const uint8_t *buf = start + 1;
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    int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length;
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    uint8_t flags;
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    uint64_t payload_len_tmp;
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    GetByteContext gb;
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    bytestream2_init(&gb, buf, buf_len);
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    flags = bytestream2_get_byte(&gb);
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    start_trim_flag        = (flags >> 4) & 1;
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    end_trim_flag          = (flags >> 3) & 1;
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    control_extension_flag = (flags >> 2) & 1;
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    payload_len_tmp = *payload_len = 0;
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    while (bytestream2_peek_byte(&gb) == 0xff)
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        payload_len_tmp += bytestream2_get_byte(&gb);
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    payload_len_tmp += bytestream2_get_byte(&gb);
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    if (start_trim_flag)
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        bytestream2_skip(&gb, 2);
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    if (end_trim_flag)
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        bytestream2_skip(&gb, 2);
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    if (control_extension_flag) {
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        control_extension_length = bytestream2_get_byte(&gb);
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        bytestream2_skip(&gb, control_extension_length);
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    }
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    if (bytestream2_tell(&gb) + payload_len_tmp > buf_len)
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        return NULL;
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    *payload_len = payload_len_tmp;
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    return buf + bytestream2_tell(&gb);
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}
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/**
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 * Find the end of the current frame in the bitstream.
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 * @return the position of the first byte of the next frame, or -1
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 */
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22671
static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
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                               const uint8_t *buf, int buf_size, int *header_len)
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{
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22671
    OpusParseContext *s = ctx->priv_data;
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    ParseContext *pc    = &s->pc;
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    int ret, start_found, i = 0, payload_len = 0;
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    const uint8_t *payload;
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    uint32_t state;
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    uint16_t hdr;
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22671
    *header_len = 0;
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    if (!buf_size)
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        return 0;
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    start_found = pc->frame_start_found;
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    state = pc->state;
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    payload = buf;
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    /* Check if we're using Opus in MPEG-TS framing */
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    if (!s->ts_framing && buf_size > 2) {
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        hdr = AV_RB16(buf);
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        if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
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            s->ts_framing = 1;
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    }
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    if (s->ts_framing && !start_found) {
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        for (i = 0; i < buf_size-2; i++) {
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            state = (state << 8) | payload[i];
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            if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
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                payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
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                if (!payload) {
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                    av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
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                    return AVERROR_INVALIDDATA;
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                }
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                *header_len = payload - buf;
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                start_found = 1;
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                break;
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            }
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        }
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    }
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    if (!s->ts_framing)
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        payload_len = buf_size;
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    if (avctx->extradata && !s->extradata_parsed) {
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        ret = ff_opus_parse_extradata(avctx, &s->ctx);
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        if (ret < 0) {
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            av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
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            return AVERROR_INVALIDDATA;
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        }
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        av_freep(&s->ctx.channel_maps);
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        s->extradata_parsed = 1;
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    }
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    if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
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        ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
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        if (ret < 0) {
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            av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
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            pc->frame_start_found = 0;
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            return AVERROR_INVALIDDATA;
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        }
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        ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
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    }
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    if (s->ts_framing) {
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        if (start_found) {
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            if (payload_len + *header_len <= buf_size) {
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                pc->frame_start_found = 0;
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                pc->state             = -1;
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                return payload_len + *header_len;
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            }
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        }
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        pc->frame_start_found = start_found;
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        pc->state = state;
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        return END_NOT_FOUND;
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    }
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    return buf_size;
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}
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static int opus_parse(AVCodecParserContext *ctx, 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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    OpusParseContext *s = ctx->priv_data;
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    ParseContext *pc    = &s->pc;
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    int next, header_len;
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    next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
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    if (s->ts_framing && next != AVERROR_INVALIDDATA &&
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        ff_combine_frame(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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    if (next == AVERROR_INVALIDDATA){
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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 + header_len;
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    *poutbuf_size = buf_size - header_len;
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    return next;
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}
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AVCodecParser ff_opus_parser = {
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    .codec_ids      = { AV_CODEC_ID_OPUS },
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    .priv_data_size = sizeof(OpusParseContext),
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    .parser_parse   = opus_parse,
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    .parser_close   = ff_parse_close
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};