GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/s302menc.c Lines: 48 93 51.6 %
Date: 2020-10-23 17:01:47 Branches: 16 49 32.7 %

Line Branch Exec Source
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/*
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 * SMPTE 302M encoder
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 * Copyright (c) 2010 Google, Inc.
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 * Copyright (c) 2013 Darryl Wallace <wallacdj@gmail.com>
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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 "avcodec.h"
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#include "internal.h"
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#include "mathops.h"
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#include "put_bits.h"
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#define AES3_HEADER_LEN 4
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typedef struct S302MEncContext {
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    uint8_t framing_index; /* Set for even channels on multiple of 192 samples */
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} S302MEncContext;
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1
static av_cold int s302m_encode_init(AVCodecContext *avctx)
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{
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1
    S302MEncContext *s = avctx->priv_data;
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1
    if (avctx->channels & 1 || avctx->channels > 8) {
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        av_log(avctx, AV_LOG_ERROR,
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               "Encoding %d channel(s) is not allowed. Only 2, 4, 6 and 8 channels are supported.\n",
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               avctx->channels);
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        return AVERROR(EINVAL);
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    }
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1
    switch (avctx->sample_fmt) {
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1
    case AV_SAMPLE_FMT_S16:
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1
        avctx->bits_per_raw_sample = 16;
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1
        break;
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    case AV_SAMPLE_FMT_S32:
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        if (avctx->bits_per_raw_sample > 20) {
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            if (avctx->bits_per_raw_sample > 24)
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                av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
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            avctx->bits_per_raw_sample = 24;
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        } else if (!avctx->bits_per_raw_sample) {
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            avctx->bits_per_raw_sample = 24;
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        } else if (avctx->bits_per_raw_sample <= 20) {
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            avctx->bits_per_raw_sample = 20;
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        }
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    }
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1
    avctx->frame_size = 0;
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1
    avctx->bit_rate   = 48000 * avctx->channels *
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1
                       (avctx->bits_per_raw_sample + 4);
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1
    s->framing_index  = 0;
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1
    return 0;
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}
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static int s302m_encode2_frame(AVCodecContext *avctx, AVPacket *avpkt,
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                               const AVFrame *frame, int *got_packet_ptr)
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{
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    S302MEncContext *s = avctx->priv_data;
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    const int buf_size = AES3_HEADER_LEN +
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                        (frame->nb_samples *
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                         avctx->channels *
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                        (avctx->bits_per_raw_sample + 4)) / 8;
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    int ret, c, channels;
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    uint8_t *o;
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    PutBitContext pb;
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    if (buf_size - AES3_HEADER_LEN > UINT16_MAX) {
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        av_log(avctx, AV_LOG_ERROR, "number of samples in frame too big\n");
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        return AVERROR(EINVAL);
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    }
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    if ((ret = ff_alloc_packet2(avctx, avpkt, buf_size, 0)) < 0)
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        return ret;
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    o = avpkt->data;
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    init_put_bits(&pb, o, buf_size);
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    put_bits(&pb, 16, buf_size - AES3_HEADER_LEN);
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    put_bits(&pb, 2, (avctx->channels - 2) >> 1);   // number of channels
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    put_bits(&pb, 8, 0);                            // channel ID
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    put_bits(&pb, 2, (avctx->bits_per_raw_sample - 16) / 4); // bits per samples (0 = 16bit, 1 = 20bit, 2 = 24bit)
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    put_bits(&pb, 4, 0);                            // alignments
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    flush_put_bits(&pb);
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    o += AES3_HEADER_LEN;
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    if (avctx->bits_per_raw_sample == 24) {
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        const uint32_t *samples = (uint32_t *)frame->data[0];
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        for (c = 0; c < frame->nb_samples; c++) {
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            uint8_t vucf = s->framing_index == 0 ? 0x10: 0;
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            for (channels = 0; channels < avctx->channels; channels += 2) {
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                o[0] = ff_reverse[(samples[0] & 0x0000FF00) >> 8];
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                o[1] = ff_reverse[(samples[0] & 0x00FF0000) >> 16];
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                o[2] = ff_reverse[(samples[0] & 0xFF000000) >> 24];
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                o[3] = ff_reverse[(samples[1] & 0x00000F00) >> 4] | vucf;
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                o[4] = ff_reverse[(samples[1] & 0x000FF000) >> 12];
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                o[5] = ff_reverse[(samples[1] & 0x0FF00000) >> 20];
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                o[6] = ff_reverse[(samples[1] & 0xF0000000) >> 28];
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                o += 7;
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                samples += 2;
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            }
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            s->framing_index++;
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            if (s->framing_index >= 192)
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                s->framing_index = 0;
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        }
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    } else if (avctx->bits_per_raw_sample == 20) {
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        const uint32_t *samples = (uint32_t *)frame->data[0];
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        for (c = 0; c < frame->nb_samples; c++) {
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            uint8_t vucf = s->framing_index == 0 ? 0x80: 0;
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            for (channels = 0; channels < avctx->channels; channels += 2) {
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                o[0] = ff_reverse[ (samples[0] & 0x000FF000) >> 12];
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                o[1] = ff_reverse[ (samples[0] & 0x0FF00000) >> 20];
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                o[2] = ff_reverse[((samples[0] & 0xF0000000) >> 28) | vucf];
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                o[3] = ff_reverse[ (samples[1] & 0x000FF000) >> 12];
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                o[4] = ff_reverse[ (samples[1] & 0x0FF00000) >> 20];
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                o[5] = ff_reverse[ (samples[1] & 0xF0000000) >> 28];
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                o += 6;
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                samples += 2;
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            }
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            s->framing_index++;
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            if (s->framing_index >= 192)
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                s->framing_index = 0;
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        }
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    } else if (avctx->bits_per_raw_sample == 16) {
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        const uint16_t *samples = (uint16_t *)frame->data[0];
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        for (c = 0; c < frame->nb_samples; c++) {
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288000
            uint8_t vucf = s->framing_index == 0 ? 0x10 : 0;
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576000
            for (channels = 0; channels < avctx->channels; channels += 2) {
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288000
                o[0] = ff_reverse[ samples[0] & 0xFF];
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288000
                o[1] = ff_reverse[(samples[0] & 0xFF00) >>  8];
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288000
                o[2] = ff_reverse[(samples[1] & 0x0F)   <<  4] | vucf;
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288000
                o[3] = ff_reverse[(samples[1] & 0x0FF0) >>  4];
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288000
                o[4] = ff_reverse[(samples[1] & 0xF000) >> 12];
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288000
                o += 5;
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                samples += 2;
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            }
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288000
            s->framing_index++;
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288000
            if (s->framing_index >= 192)
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1500
                s->framing_index = 0;
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        }
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    }
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    *got_packet_ptr = 1;
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    return 0;
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}
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AVCodec ff_s302m_encoder = {
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    .name                  = "s302m",
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    .long_name             = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
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    .type                  = AVMEDIA_TYPE_AUDIO,
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    .id                    = AV_CODEC_ID_S302M,
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    .priv_data_size        = sizeof(S302MEncContext),
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    .init                  = s302m_encode_init,
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    .encode2               = s302m_encode2_frame,
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    .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32,
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                                                            AV_SAMPLE_FMT_S16,
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                                                            AV_SAMPLE_FMT_NONE },
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    .capabilities          = AV_CODEC_CAP_VARIABLE_FRAME_SIZE | AV_CODEC_CAP_EXPERIMENTAL,
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    .supported_samplerates = (const int[]) { 48000, 0 },
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 /* .channel_layouts       = (const uint64_t[]) { AV_CH_LAYOUT_STEREO,
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                                                  AV_CH_LAYOUT_QUAD,
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                                                  AV_CH_LAYOUT_5POINT1_BACK,
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                                                  AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX,
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                                                  0 }, */
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};