LCOV - code coverage report
Current view: top level - libavcodec - s302menc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 48 93 51.6 %
Date: 2017-12-16 01:21:47 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * SMPTE 302M encoder
       3             :  * Copyright (c) 2010 Google, Inc.
       4             :  * Copyright (c) 2013 Darryl Wallace <wallacdj@gmail.com>
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #include "avcodec.h"
      24             : #include "internal.h"
      25             : #include "mathops.h"
      26             : #include "put_bits.h"
      27             : 
      28             : #define AES3_HEADER_LEN 4
      29             : 
      30             : typedef struct S302MEncContext {
      31             :     uint8_t framing_index; /* Set for even channels on multiple of 192 samples */
      32             : } S302MEncContext;
      33             : 
      34           1 : static av_cold int s302m_encode_init(AVCodecContext *avctx)
      35             : {
      36           1 :     S302MEncContext *s = avctx->priv_data;
      37             : 
      38           1 :     if (avctx->channels & 1 || avctx->channels > 8) {
      39           0 :         av_log(avctx, AV_LOG_ERROR,
      40             :                "Encoding %d channel(s) is not allowed. Only 2, 4, 6 and 8 channels are supported.\n",
      41             :                avctx->channels);
      42           0 :         return AVERROR(EINVAL);
      43             :     }
      44             : 
      45           1 :     switch (avctx->sample_fmt) {
      46           1 :     case AV_SAMPLE_FMT_S16:
      47           1 :         avctx->bits_per_raw_sample = 16;
      48           1 :         break;
      49           0 :     case AV_SAMPLE_FMT_S32:
      50           0 :         if (avctx->bits_per_raw_sample > 20) {
      51           0 :             if (avctx->bits_per_raw_sample > 24)
      52           0 :                 av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
      53           0 :             avctx->bits_per_raw_sample = 24;
      54           0 :         } else if (!avctx->bits_per_raw_sample) {
      55           0 :             avctx->bits_per_raw_sample = 24;
      56           0 :         } else if (avctx->bits_per_raw_sample <= 20) {
      57           0 :             avctx->bits_per_raw_sample = 20;
      58             :         }
      59             :     }
      60             : 
      61           1 :     avctx->frame_size = 0;
      62           2 :     avctx->bit_rate   = 48000 * avctx->channels *
      63           1 :                        (avctx->bits_per_raw_sample + 4);
      64           1 :     s->framing_index  = 0;
      65             : 
      66           1 :     return 0;
      67             : }
      68             : 
      69         260 : static int s302m_encode2_frame(AVCodecContext *avctx, AVPacket *avpkt,
      70             :                                const AVFrame *frame, int *got_packet_ptr)
      71             : {
      72         260 :     S302MEncContext *s = avctx->priv_data;
      73         260 :     const int buf_size = AES3_HEADER_LEN +
      74         520 :                         (frame->nb_samples *
      75         520 :                          avctx->channels *
      76         520 :                         (avctx->bits_per_raw_sample + 4)) / 8;
      77             :     int ret, c, channels;
      78             :     uint8_t *o;
      79             :     PutBitContext pb;
      80             : 
      81         260 :     if (buf_size - AES3_HEADER_LEN > UINT16_MAX) {
      82           0 :         av_log(avctx, AV_LOG_ERROR, "number of samples in frame too big\n");
      83           0 :         return AVERROR(EINVAL);
      84             :     }
      85             : 
      86         260 :     if ((ret = ff_alloc_packet2(avctx, avpkt, buf_size, 0)) < 0)
      87           0 :         return ret;
      88             : 
      89         260 :     o = avpkt->data;
      90         260 :     init_put_bits(&pb, o, buf_size);
      91         260 :     put_bits(&pb, 16, buf_size - AES3_HEADER_LEN);
      92         260 :     put_bits(&pb, 2, (avctx->channels - 2) >> 1);   // number of channels
      93         260 :     put_bits(&pb, 8, 0);                            // channel ID
      94         260 :     put_bits(&pb, 2, (avctx->bits_per_raw_sample - 16) / 4); // bits per samples (0 = 16bit, 1 = 20bit, 2 = 24bit)
      95         260 :     put_bits(&pb, 4, 0);                            // alignments
      96         260 :     flush_put_bits(&pb);
      97         260 :     o += AES3_HEADER_LEN;
      98             : 
      99         260 :     if (avctx->bits_per_raw_sample == 24) {
     100           0 :         const uint32_t *samples = (uint32_t *)frame->data[0];
     101             : 
     102           0 :         for (c = 0; c < frame->nb_samples; c++) {
     103           0 :             uint8_t vucf = s->framing_index == 0 ? 0x10: 0;
     104             : 
     105           0 :             for (channels = 0; channels < avctx->channels; channels += 2) {
     106           0 :                 o[0] = ff_reverse[(samples[0] & 0x0000FF00) >> 8];
     107           0 :                 o[1] = ff_reverse[(samples[0] & 0x00FF0000) >> 16];
     108           0 :                 o[2] = ff_reverse[(samples[0] & 0xFF000000) >> 24];
     109           0 :                 o[3] = ff_reverse[(samples[1] & 0x00000F00) >> 4] | vucf;
     110           0 :                 o[4] = ff_reverse[(samples[1] & 0x000FF000) >> 12];
     111           0 :                 o[5] = ff_reverse[(samples[1] & 0x0FF00000) >> 20];
     112           0 :                 o[6] = ff_reverse[(samples[1] & 0xF0000000) >> 28];
     113           0 :                 o += 7;
     114           0 :                 samples += 2;
     115             :             }
     116             : 
     117           0 :             s->framing_index++;
     118           0 :             if (s->framing_index >= 192)
     119           0 :                 s->framing_index = 0;
     120             :         }
     121         260 :     } else if (avctx->bits_per_raw_sample == 20) {
     122           0 :         const uint32_t *samples = (uint32_t *)frame->data[0];
     123             : 
     124           0 :         for (c = 0; c < frame->nb_samples; c++) {
     125           0 :             uint8_t vucf = s->framing_index == 0 ? 0x80: 0;
     126             : 
     127           0 :             for (channels = 0; channels < avctx->channels; channels += 2) {
     128           0 :                 o[0] = ff_reverse[ (samples[0] & 0x000FF000) >> 12];
     129           0 :                 o[1] = ff_reverse[ (samples[0] & 0x0FF00000) >> 20];
     130           0 :                 o[2] = ff_reverse[((samples[0] & 0xF0000000) >> 28) | vucf];
     131           0 :                 o[3] = ff_reverse[ (samples[1] & 0x000FF000) >> 12];
     132           0 :                 o[4] = ff_reverse[ (samples[1] & 0x0FF00000) >> 20];
     133           0 :                 o[5] = ff_reverse[ (samples[1] & 0xF0000000) >> 28];
     134           0 :                 o += 6;
     135           0 :                 samples += 2;
     136             :             }
     137             : 
     138           0 :             s->framing_index++;
     139           0 :             if (s->framing_index >= 192)
     140           0 :                 s->framing_index = 0;
     141             :         }
     142         260 :     } else if (avctx->bits_per_raw_sample == 16) {
     143         260 :         const uint16_t *samples = (uint16_t *)frame->data[0];
     144             : 
     145      288260 :         for (c = 0; c < frame->nb_samples; c++) {
     146      288000 :             uint8_t vucf = s->framing_index == 0 ? 0x10 : 0;
     147             : 
     148      576000 :             for (channels = 0; channels < avctx->channels; channels += 2) {
     149      288000 :                 o[0] = ff_reverse[ samples[0] & 0xFF];
     150      288000 :                 o[1] = ff_reverse[(samples[0] & 0xFF00) >>  8];
     151      288000 :                 o[2] = ff_reverse[(samples[1] & 0x0F)   <<  4] | vucf;
     152      288000 :                 o[3] = ff_reverse[(samples[1] & 0x0FF0) >>  4];
     153      288000 :                 o[4] = ff_reverse[(samples[1] & 0xF000) >> 12];
     154      288000 :                 o += 5;
     155      288000 :                 samples += 2;
     156             : 
     157             :             }
     158             : 
     159      288000 :             s->framing_index++;
     160      288000 :             if (s->framing_index >= 192)
     161        1500 :                 s->framing_index = 0;
     162             :         }
     163             :     }
     164             : 
     165         260 :     *got_packet_ptr = 1;
     166             : 
     167         260 :     return 0;
     168             : }
     169             : 
     170             : AVCodec ff_s302m_encoder = {
     171             :     .name                  = "s302m",
     172             :     .long_name             = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
     173             :     .type                  = AVMEDIA_TYPE_AUDIO,
     174             :     .id                    = AV_CODEC_ID_S302M,
     175             :     .priv_data_size        = sizeof(S302MEncContext),
     176             :     .init                  = s302m_encode_init,
     177             :     .encode2               = s302m_encode2_frame,
     178             :     .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32,
     179             :                                                             AV_SAMPLE_FMT_S16,
     180             :                                                             AV_SAMPLE_FMT_NONE },
     181             :     .capabilities          = AV_CODEC_CAP_VARIABLE_FRAME_SIZE | AV_CODEC_CAP_EXPERIMENTAL,
     182             :     .supported_samplerates = (const int[]) { 48000, 0 },
     183             :  /* .channel_layouts       = (const uint64_t[]) { AV_CH_LAYOUT_STEREO,
     184             :                                                   AV_CH_LAYOUT_QUAD,
     185             :                                                   AV_CH_LAYOUT_5POINT1_BACK,
     186             :                                                   AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX,
     187             :                                                   0 }, */
     188             : };

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