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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
194 lines
7.4 KiB
C
194 lines
7.4 KiB
C
/*
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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 "libavutil/channel_layout.h"
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#include "libavutil/reverse.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "encode.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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static av_cold int s302m_encode_init(AVCodecContext *avctx)
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{
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S302MEncContext *s = avctx->priv_data;
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if (avctx->ch_layout.nb_channels & 1 || avctx->ch_layout.nb_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->ch_layout.nb_channels);
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return AVERROR(EINVAL);
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}
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switch (avctx->sample_fmt) {
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case AV_SAMPLE_FMT_S16:
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avctx->bits_per_raw_sample = 16;
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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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avctx->frame_size = 0;
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avctx->bit_rate = 48000 * avctx->ch_layout.nb_channels *
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(avctx->bits_per_raw_sample + 4);
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s->framing_index = 0;
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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 nb_channels = avctx->ch_layout.nb_channels;
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const int buf_size = AES3_HEADER_LEN +
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(frame->nb_samples * nb_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_get_encode_buffer(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, (nb_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 < nb_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 < nb_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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uint8_t vucf = s->framing_index == 0 ? 0x10 : 0;
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for (channels = 0; channels < nb_channels; channels += 2) {
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o[0] = ff_reverse[ samples[0] & 0xFF];
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o[1] = ff_reverse[(samples[0] & 0xFF00) >> 8];
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o[2] = ff_reverse[(samples[1] & 0x0F) << 4] | vucf;
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o[3] = ff_reverse[(samples[1] & 0x0FF0) >> 4];
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o[4] = ff_reverse[(samples[1] & 0xF000) >> 12];
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o += 5;
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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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}
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*got_packet_ptr = 1;
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return 0;
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}
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const FFCodec ff_s302m_encoder = {
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.p.name = "s302m",
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.p.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_S302M,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_EXPERIMENTAL |
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AV_CODEC_CAP_VARIABLE_FRAME_SIZE,
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.priv_data_size = sizeof(S302MEncContext),
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.init = s302m_encode_init,
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FF_CODEC_ENCODE_CB(s302m_encode2_frame),
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.p.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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.p.supported_samplerates = (const int[]) { 48000, 0 },
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/* .p.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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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