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FFmpeg/libavcodec/pcm-blurayenc.c
Paul B Mahol 47c3b34506 avcodec: add pcm-bluray encoder
2022-03-06 12:45:59 +01:00

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/*
* LPCM codecs for PCM formats found in Blu-ray m2ts streams
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "bytestream.h"
#include "encode.h"
#include "internal.h"
typedef struct BlurayPCMEncContext {
uint16_t header; // Header added to every frame
} BlurayPCMEncContext;
static av_cold int pcm_bluray_encode_init(AVCodecContext *avctx)
{
BlurayPCMEncContext *s = avctx->priv_data;
uint8_t ch_layout;
int quant, freq;
switch (avctx->sample_rate) {
case 48000:
freq = 1;
break;
case 96000:
freq = 4;
break;
case 192000:
freq = 5;
break;
default:
return AVERROR_BUG;
}
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_S16:
avctx->bits_per_coded_sample = 16;
quant = 1;
break;
case AV_SAMPLE_FMT_S32:
avctx->bits_per_coded_sample = 24;
quant = 3;
break;
default:
return AVERROR_BUG;
}
switch (avctx->channel_layout) {
case AV_CH_LAYOUT_MONO:
ch_layout = 1;
break;
case AV_CH_LAYOUT_STEREO:
ch_layout = 3;
break;
case AV_CH_LAYOUT_SURROUND:
ch_layout = 4;
break;
case AV_CH_LAYOUT_2_1:
ch_layout = 5;
break;
case AV_CH_LAYOUT_4POINT0:
ch_layout = 6;
break;
case AV_CH_LAYOUT_2_2:
ch_layout = 7;
break;
case AV_CH_LAYOUT_5POINT0:
ch_layout = 8;
break;
case AV_CH_LAYOUT_5POINT1:
ch_layout = 9;
break;
case AV_CH_LAYOUT_7POINT0:
ch_layout = 10;
break;
case AV_CH_LAYOUT_7POINT1:
ch_layout = 11;
break;
default:
return AVERROR_BUG;
}
s->header = (((ch_layout << 4) | freq) << 8) | (quant << 6);
return 0;
}
static int pcm_bluray_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
BlurayPCMEncContext *s = avctx->priv_data;
int sample_size, samples, channel, num_dest_channels;
const int16_t *src16;
const int32_t *src32;
unsigned pkt_size;
PutByteContext pb;
int ret;
num_dest_channels = FFALIGN(avctx->channels, 2);
sample_size = (num_dest_channels *
(avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
samples = frame->nb_samples;
pkt_size = sample_size * samples + 4;
if ((ret = ff_get_encode_buffer(avctx, avpkt, pkt_size, 0)) < 0)
return ret;
AV_WB16(avpkt->data, pkt_size - 4);
AV_WB16(avpkt->data + 2, s->header);
src16 = (const int16_t *)frame->data[0];
src32 = (const int32_t *)frame->data[0];
bytestream2_init_writer(&pb, avpkt->data + 4, avpkt->size - 4);
switch (avctx->channel_layout) {
/* cases with same number of source and coded channels */
case AV_CH_LAYOUT_STEREO:
case AV_CH_LAYOUT_4POINT0:
case AV_CH_LAYOUT_2_2:
samples *= num_dest_channels;
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
#if HAVE_BIGENDIAN
bytestream2_put_bufferu(&pb, frame->data[0], samples * 2);
#else
do {
bytestream2_put_be16u(&pb, *src16++);
} while (--samples);
#endif
} else {
do {
bytestream2_put_be24u(&pb, (*src32++) >> 8);
} while (--samples);
}
break;
/* cases where number of source channels = coded channels + 1 */
case AV_CH_LAYOUT_MONO:
case AV_CH_LAYOUT_SURROUND:
case AV_CH_LAYOUT_2_1:
case AV_CH_LAYOUT_5POINT0:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
#if HAVE_BIGENDIAN
bytestream2_put_bufferu(&pb, (const uint8_t *)src16, avctx->channels * 2);
src16 += avctx->channels;
#else
channel = avctx->channels;
do {
bytestream2_put_be16u(&pb, *src16++);
} while (--channel);
#endif
bytestream2_put_ne16(&pb, 0);
} while (--samples);
} else {
do {
channel = avctx->channels;
do {
bytestream2_put_be24u(&pb, (*src32++) >> 8);
} while (--channel);
bytestream2_put_ne24(&pb, 0);
} while (--samples);
}
break;
/* remapping: L, R, C, LBack, RBack, LF */
case AV_CH_LAYOUT_5POINT1:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[3]);
src16 += 6;
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0] >> 8);
bytestream2_put_be24u(&pb, src32[1] >> 8);
bytestream2_put_be24u(&pb, src32[2] >> 8);
bytestream2_put_be24u(&pb, src32[4] >> 8);
bytestream2_put_be24u(&pb, src32[5] >> 8);
bytestream2_put_be24u(&pb, src32[3] >> 8);
src32 += 6;
} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
case AV_CH_LAYOUT_7POINT0:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[3]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[6]);
src16 += 7;
bytestream2_put_ne16(&pb, 0);
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0] >> 8);
bytestream2_put_be24u(&pb, src32[1] >> 8);
bytestream2_put_be24u(&pb, src32[2] >> 8);
bytestream2_put_be24u(&pb, src32[5] >> 8);
bytestream2_put_be24u(&pb, src32[3] >> 8);
bytestream2_put_be24u(&pb, src32[4] >> 8);
bytestream2_put_be24u(&pb, src32[6] >> 8);
src32 += 7;
bytestream2_put_ne24(&pb, 0);
} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
case AV_CH_LAYOUT_7POINT1:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[6]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[7]);
bytestream2_put_be16u(&pb, src16[3]);
src16 += 8;
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0]);
bytestream2_put_be24u(&pb, src32[1]);
bytestream2_put_be24u(&pb, src32[2]);
bytestream2_put_be24u(&pb, src32[6]);
bytestream2_put_be24u(&pb, src32[4]);
bytestream2_put_be24u(&pb, src32[5]);
bytestream2_put_be24u(&pb, src32[7]);
bytestream2_put_be24u(&pb, src32[3]);
src32 += 8;
} while (--samples);
}
break;
default:
return AVERROR_BUG;
}
avpkt->pts = frame->pts;
avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
*got_packet_ptr = 1;
return 0;
}
const AVCodec ff_pcm_bluray_encoder = {
.name = "pcm_bluray",
.long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_PCM_BLURAY,
.priv_data_size = sizeof(BlurayPCMEncContext),
.init = pcm_bluray_encode_init,
.encode2 = pcm_bluray_encode_frame,
.supported_samplerates = (const int[]) { 48000, 96000, 192000, 0 },
.channel_layouts = (const uint64_t[]) {
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
AV_CH_LAYOUT_SURROUND,
AV_CH_LAYOUT_2_1,
AV_CH_LAYOUT_4POINT0,
AV_CH_LAYOUT_2_2,
AV_CH_LAYOUT_5POINT0,
AV_CH_LAYOUT_5POINT1,
AV_CH_LAYOUT_7POINT0,
AV_CH_LAYOUT_7POINT1,
0 },
.sample_fmts = (const enum AVSampleFormat[]) {
AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_VARIABLE_FRAME_SIZE,
};
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