[FFmpeg-devel] [PATCH 2/2] avcodec: add pcm-bluray encoder
Paul B Mahol
onemda at gmail.com
Mon Feb 28 23:25:00 EET 2022
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/pcm-blurayenc.c | 291 +++++++++++++++++++++++++++++++++++++
3 files changed, 293 insertions(+)
create mode 100644 libavcodec/pcm-blurayenc.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 6076b4ad80..e34a9ae862 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -800,6 +800,7 @@ OBJS-$(CONFIG_ZMBV_ENCODER) += zmbvenc.o
# (AD)PCM decoders/encoders
OBJS-$(CONFIG_PCM_ALAW_DECODER) += pcm.o
OBJS-$(CONFIG_PCM_ALAW_ENCODER) += pcm.o
+OBJS-$(CONFIG_PCM_BLURAY_ENCODER) += pcm-blurayenc.o
OBJS-$(CONFIG_PCM_BLURAY_DECODER) += pcm-bluray.o
OBJS-$(CONFIG_PCM_DVD_DECODER) += pcm-dvd.o
OBJS-$(CONFIG_PCM_DVD_ENCODER) += pcm-dvdenc.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index d1e10197de..1be67e3ec3 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -531,6 +531,7 @@ extern const AVCodec ff_xma2_decoder;
/* PCM codecs */
extern const AVCodec ff_pcm_alaw_encoder;
extern const AVCodec ff_pcm_alaw_decoder;
+extern const AVCodec ff_pcm_bluray_encoder;
extern const AVCodec ff_pcm_bluray_decoder;
extern const AVCodec ff_pcm_dvd_encoder;
extern const AVCodec ff_pcm_dvd_decoder;
diff --git a/libavcodec/pcm-blurayenc.c b/libavcodec/pcm-blurayenc.c
new file mode 100644
index 0000000000..c7b6981454
--- /dev/null
+++ b/libavcodec/pcm-blurayenc.c
@@ -0,0 +1,291 @@
+/*
+ * 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;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ 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,
+};
--
2.33.0
More information about the ffmpeg-devel
mailing list