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-rw-r--r--libavcodec/pcm-bluray.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/libavcodec/pcm-bluray.c b/libavcodec/pcm-bluray.c
new file mode 100644
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+++ b/libavcodec/pcm-bluray.c
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+/*
+ * LPCM codecs for PCM format found in Blu-ray PCM streams
+ * Copyright (c) 2009, 2013 Christian Schmidt
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * PCM codec for Blu-ray PCM audio tracks
+ */
+
+#include "libavutil/channel_layout.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+/*
+ * Channel Mapping according to
+ * Blu-ray Disc Read-Only Format Version 1
+ * Part 3: Audio Visual Basic Specifications
+ * mono M1 X
+ * stereo L R
+ * 3/0 L R C X
+ * 2/1 L R S X
+ * 3/1 L R C S
+ * 2/2 L R LS RS
+ * 3/2 L R C LS RS X
+ * 3/2+lfe L R C LS RS lfe
+ * 3/4 L R C LS Rls Rrs RS X
+ * 3/4+lfe L R C LS Rls Rrs RS lfe
+ */
+
+/**
+ * Parse the header of a LPCM frame read from a MPEG-TS stream
+ * @param avctx the codec context
+ * @param header pointer to the first four bytes of the data packet
+ */
+static int pcm_bluray_parse_header(AVCodecContext *avctx,
+ const uint8_t *header)
+{
+ static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 };
+ static const uint32_t channel_layouts[16] = {
+ 0, AV_CH_LAYOUT_MONO, 0, 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, 0, 0, 0
+ };
+ static const uint8_t channels[16] = {
+ 0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0
+ };
+ uint8_t channel_layout = header[2] >> 4;
+
+ if (avctx->debug & FF_DEBUG_PICT_INFO)
+ av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n",
+ header[0], header[1], header[2], header[3]);
+
+ /* get the sample depth and derive the sample format from it */
+ avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6];
+ if (!avctx->bits_per_coded_sample) {
+ av_log(avctx, AV_LOG_ERROR, "reserved sample depth (0)\n");
+ return AVERROR_INVALIDDATA;
+ }
+ avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 :
+ AV_SAMPLE_FMT_S32;
+ avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
+
+ /* get the sample rate. Not all values are used. */
+ switch (header[2] & 0x0f) {
+ case 1:
+ avctx->sample_rate = 48000;
+ break;
+ case 4:
+ avctx->sample_rate = 96000;
+ break;
+ case 5:
+ avctx->sample_rate = 192000;
+ break;
+ default:
+ avctx->sample_rate = 0;
+ av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n",
+ header[2] & 0x0f);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /*
+ * get the channel number (and mapping). Not all values are used.
+ * It must be noted that the number of channels in the MPEG stream can
+ * differ from the actual meaningful number, e.g. mono audio still has two
+ * channels, one being empty.
+ */
+ avctx->channel_layout = channel_layouts[channel_layout];
+ avctx->channels = channels[channel_layout];
+ if (!avctx->channels) {
+ av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n",
+ channel_layout);
+ return AVERROR_INVALIDDATA;
+ }
+
+ avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate *
+ avctx->bits_per_coded_sample;
+
+ if (avctx->debug & FF_DEBUG_PICT_INFO)
+ av_dlog(avctx,
+ "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n",
+ avctx->channels, avctx->bits_per_coded_sample,
+ avctx->sample_rate, avctx->bit_rate);
+ return 0;
+}
+
+static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
+ const uint8_t *src = avpkt->data;
+ int buf_size = avpkt->size;
+ GetByteContext gb;
+ int num_source_channels, channel, retval;
+ int sample_size, samples;
+ int16_t *dst16;
+ int32_t *dst32;
+
+ if (buf_size < 4) {
+ av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((retval = pcm_bluray_parse_header(avctx, src)))
+ return retval;
+ src += 4;
+ buf_size -= 4;
+
+ bytestream2_init(&gb, src, buf_size);
+
+ /* There's always an even number of channels in the source */
+ num_source_channels = FFALIGN(avctx->channels, 2);
+ sample_size = (num_source_channels * (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
+ samples = buf_size / sample_size;
+
+ /* get output buffer */
+ frame->nb_samples = samples;
+ if ((retval = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return retval;
+ }
+ dst16 = (int16_t *)frame->data[0];
+ dst32 = (int32_t *)frame->data[0];
+
+ if (samples) {
+ 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_source_channels;
+ if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
+#if HAVE_BIGENDIAN
+ bytestream2_get_buffer(&gb, dst16, buf_size);
+#else
+ do {
+ *dst16++ = bytestream2_get_be16u(&gb);
+ } while (--samples);
+#endif
+ } else {
+ do {
+ *dst32++ = bytestream2_get_be24u(&gb) << 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_get_buffer(&gb, dst16, avctx->channels * 2);
+ dst16 += avctx->channels;
+#else
+ channel = avctx->channels;
+ do {
+ *dst16++ = bytestream2_get_be16u(&gb);
+ } while (--channel);
+#endif
+ bytestream2_skip(&gb, 2);
+ } while (--samples);
+ } else {
+ do {
+ channel = avctx->channels;
+ do {
+ *dst32++ = bytestream2_get_be24u(&gb) << 8;
+ } while (--channel);
+ bytestream2_skip(&gb, 3);
+ } while (--samples);
+ }
+ break;
+ /* remapping: L, R, C, LBack, RBack, LF */
+ case AV_CH_LAYOUT_5POINT1:
+ if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
+ do {
+ dst16[0] = bytestream2_get_be16u(&gb);
+ dst16[1] = bytestream2_get_be16u(&gb);
+ dst16[2] = bytestream2_get_be16u(&gb);
+ dst16[4] = bytestream2_get_be16u(&gb);
+ dst16[5] = bytestream2_get_be16u(&gb);
+ dst16[3] = bytestream2_get_be16u(&gb);
+ dst16 += 6;
+ } while (--samples);
+ } else {
+ do {
+ dst32[0] = bytestream2_get_be24u(&gb) << 8;
+ dst32[1] = bytestream2_get_be24u(&gb) << 8;
+ dst32[2] = bytestream2_get_be24u(&gb) << 8;
+ dst32[4] = bytestream2_get_be24u(&gb) << 8;
+ dst32[5] = bytestream2_get_be24u(&gb) << 8;
+ dst32[3] = bytestream2_get_be24u(&gb) << 8;
+ dst32 += 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 {
+ dst16[0] = bytestream2_get_be16u(&gb);
+ dst16[1] = bytestream2_get_be16u(&gb);
+ dst16[2] = bytestream2_get_be16u(&gb);
+ dst16[5] = bytestream2_get_be16u(&gb);
+ dst16[3] = bytestream2_get_be16u(&gb);
+ dst16[4] = bytestream2_get_be16u(&gb);
+ dst16[6] = bytestream2_get_be16u(&gb);
+ dst16 += 7;
+ bytestream2_skip(&gb, 2);
+ } while (--samples);
+ } else {
+ do {
+ dst32[0] = bytestream2_get_be24u(&gb) << 8;
+ dst32[1] = bytestream2_get_be24u(&gb) << 8;
+ dst32[2] = bytestream2_get_be24u(&gb) << 8;
+ dst32[5] = bytestream2_get_be24u(&gb) << 8;
+ dst32[3] = bytestream2_get_be24u(&gb) << 8;
+ dst32[4] = bytestream2_get_be24u(&gb) << 8;
+ dst32[6] = bytestream2_get_be24u(&gb) << 8;
+ dst32 += 7;
+ bytestream2_skip(&gb, 3);
+ } 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 {
+ dst16[0] = bytestream2_get_be16u(&gb);
+ dst16[1] = bytestream2_get_be16u(&gb);
+ dst16[2] = bytestream2_get_be16u(&gb);
+ dst16[6] = bytestream2_get_be16u(&gb);
+ dst16[4] = bytestream2_get_be16u(&gb);
+ dst16[5] = bytestream2_get_be16u(&gb);
+ dst16[7] = bytestream2_get_be16u(&gb);
+ dst16[3] = bytestream2_get_be16u(&gb);
+ dst16 += 8;
+ } while (--samples);
+ } else {
+ do {
+ dst32[0] = bytestream2_get_be24u(&gb) << 8;
+ dst32[1] = bytestream2_get_be24u(&gb) << 8;
+ dst32[2] = bytestream2_get_be24u(&gb) << 8;
+ dst32[6] = bytestream2_get_be24u(&gb) << 8;
+ dst32[4] = bytestream2_get_be24u(&gb) << 8;
+ dst32[5] = bytestream2_get_be24u(&gb) << 8;
+ dst32[7] = bytestream2_get_be24u(&gb) << 8;
+ dst32[3] = bytestream2_get_be24u(&gb) << 8;
+ dst32 += 8;
+ } while (--samples);
+ }
+ break;
+ }
+ }
+
+ *got_frame_ptr = 1;
+
+ retval = bytestream2_tell(&gb);
+ if (avctx->debug & FF_DEBUG_BITSTREAM)
+ av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
+ retval, buf_size);
+ return retval + 4;
+}
+
+AVCodec ff_pcm_bluray_decoder = {
+ .name = "pcm_bluray",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_PCM_BLURAY,
+ .decode = pcm_bluray_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .sample_fmts = (const enum AVSampleFormat[]){
+ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
+ },
+ .long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 22:24:33 +0000