mirror of
https://github.com/FFmpeg/FFmpeg.git
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298 lines
9.8 KiB
C
298 lines
9.8 KiB
C
/*
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* LPCM codecs for PCM formats found in Blu-ray m2ts streams
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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 "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "encode.h"
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typedef struct BlurayPCMEncContext {
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uint16_t header; // Header added to every frame
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} BlurayPCMEncContext;
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static av_cold int pcm_bluray_encode_init(AVCodecContext *avctx)
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{
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BlurayPCMEncContext *s = avctx->priv_data;
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uint8_t ch_layout;
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int quant, freq, frame_size;
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switch (avctx->sample_fmt) {
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case AV_SAMPLE_FMT_S16:
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avctx->bits_per_coded_sample = 16;
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frame_size = 240;
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quant = 1;
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break;
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case AV_SAMPLE_FMT_S32:
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frame_size = 360;
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avctx->bits_per_coded_sample = 24;
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quant = 3;
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break;
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default:
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return AVERROR_BUG;
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}
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switch (avctx->sample_rate) {
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case 48000:
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freq = 1;
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break;
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case 96000:
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freq = 4;
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break;
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case 192000:
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freq = 5;
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break;
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default:
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return AVERROR_BUG;
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}
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switch (av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0)) {
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case AV_CH_LAYOUT_MONO:
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ch_layout = 1;
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break;
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case AV_CH_LAYOUT_STEREO:
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ch_layout = 3;
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break;
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case AV_CH_LAYOUT_SURROUND:
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ch_layout = 4;
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break;
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case AV_CH_LAYOUT_2_1:
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ch_layout = 5;
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break;
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case AV_CH_LAYOUT_4POINT0:
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ch_layout = 6;
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break;
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case AV_CH_LAYOUT_2_2:
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ch_layout = 7;
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break;
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case AV_CH_LAYOUT_5POINT0:
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ch_layout = 8;
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break;
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case AV_CH_LAYOUT_5POINT1:
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ch_layout = 9;
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break;
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case AV_CH_LAYOUT_7POINT0:
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ch_layout = 10;
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break;
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case AV_CH_LAYOUT_7POINT1:
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ch_layout = 11;
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break;
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default:
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return AVERROR_BUG;
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}
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s->header = (((ch_layout << 4) | freq) << 8) | (quant << 6);
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avctx->frame_size = frame_size;
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return 0;
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}
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static int pcm_bluray_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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BlurayPCMEncContext *s = avctx->priv_data;
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int sample_size, samples, channel, num_dest_channels;
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const int16_t *src16;
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const int32_t *src32;
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unsigned pkt_size;
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PutByteContext pb;
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int ret;
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num_dest_channels = FFALIGN(avctx->ch_layout.nb_channels, 2);
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sample_size = (num_dest_channels *
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(avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
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samples = frame->nb_samples;
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pkt_size = sample_size * samples + 4;
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if ((ret = ff_get_encode_buffer(avctx, avpkt, pkt_size, 0)) < 0)
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return ret;
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AV_WB16(avpkt->data, pkt_size - 4);
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AV_WB16(avpkt->data + 2, s->header);
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src16 = (const int16_t *)frame->data[0];
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src32 = (const int32_t *)frame->data[0];
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bytestream2_init_writer(&pb, avpkt->data + 4, avpkt->size - 4);
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switch (avctx->ch_layout.u.mask) {
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/* cases with same number of source and coded channels */
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case AV_CH_LAYOUT_STEREO:
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case AV_CH_LAYOUT_4POINT0:
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case AV_CH_LAYOUT_2_2:
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samples *= num_dest_channels;
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
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#if HAVE_BIGENDIAN
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bytestream2_put_bufferu(&pb, frame->data[0], samples * 2);
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#else
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do {
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bytestream2_put_be16u(&pb, *src16++);
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} while (--samples);
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#endif
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} else {
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do {
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bytestream2_put_be24u(&pb, (*src32++) >> 8);
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} while (--samples);
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}
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break;
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/* cases where number of source channels = coded channels + 1 */
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case AV_CH_LAYOUT_MONO:
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case AV_CH_LAYOUT_SURROUND:
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case AV_CH_LAYOUT_2_1:
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case AV_CH_LAYOUT_5POINT0:
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
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do {
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#if HAVE_BIGENDIAN
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bytestream2_put_bufferu(&pb, (const uint8_t *)src16, avctx->ch_layout.nb_channels * 2);
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src16 += avctx->ch_layout.nb_channels;
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#else
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channel = avctx->ch_layout.nb_channels;
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do {
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bytestream2_put_be16u(&pb, *src16++);
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} while (--channel);
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#endif
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bytestream2_put_ne16(&pb, 0);
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} while (--samples);
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} else {
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do {
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channel = avctx->ch_layout.nb_channels;
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do {
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bytestream2_put_be24u(&pb, (*src32++) >> 8);
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} while (--channel);
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bytestream2_put_ne24(&pb, 0);
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} while (--samples);
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}
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break;
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/* remapping: L, R, C, LBack, RBack, LF */
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case AV_CH_LAYOUT_5POINT1:
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
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do {
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bytestream2_put_be16u(&pb, src16[0]);
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bytestream2_put_be16u(&pb, src16[1]);
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bytestream2_put_be16u(&pb, src16[2]);
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bytestream2_put_be16u(&pb, src16[4]);
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bytestream2_put_be16u(&pb, src16[5]);
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bytestream2_put_be16u(&pb, src16[3]);
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src16 += 6;
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} while (--samples);
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} else {
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do {
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bytestream2_put_be24u(&pb, src32[0] >> 8);
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bytestream2_put_be24u(&pb, src32[1] >> 8);
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bytestream2_put_be24u(&pb, src32[2] >> 8);
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bytestream2_put_be24u(&pb, src32[4] >> 8);
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bytestream2_put_be24u(&pb, src32[5] >> 8);
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bytestream2_put_be24u(&pb, src32[3] >> 8);
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src32 += 6;
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} while (--samples);
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}
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break;
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/* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
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case AV_CH_LAYOUT_7POINT0:
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
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do {
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bytestream2_put_be16u(&pb, src16[0]);
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bytestream2_put_be16u(&pb, src16[1]);
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bytestream2_put_be16u(&pb, src16[2]);
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bytestream2_put_be16u(&pb, src16[5]);
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bytestream2_put_be16u(&pb, src16[3]);
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bytestream2_put_be16u(&pb, src16[4]);
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bytestream2_put_be16u(&pb, src16[6]);
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src16 += 7;
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bytestream2_put_ne16(&pb, 0);
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} while (--samples);
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} else {
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do {
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bytestream2_put_be24u(&pb, src32[0] >> 8);
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bytestream2_put_be24u(&pb, src32[1] >> 8);
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bytestream2_put_be24u(&pb, src32[2] >> 8);
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bytestream2_put_be24u(&pb, src32[5] >> 8);
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bytestream2_put_be24u(&pb, src32[3] >> 8);
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bytestream2_put_be24u(&pb, src32[4] >> 8);
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bytestream2_put_be24u(&pb, src32[6] >> 8);
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src32 += 7;
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bytestream2_put_ne24(&pb, 0);
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} while (--samples);
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}
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break;
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/* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
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case AV_CH_LAYOUT_7POINT1:
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
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do {
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bytestream2_put_be16u(&pb, src16[0]);
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bytestream2_put_be16u(&pb, src16[1]);
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bytestream2_put_be16u(&pb, src16[2]);
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bytestream2_put_be16u(&pb, src16[6]);
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bytestream2_put_be16u(&pb, src16[4]);
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bytestream2_put_be16u(&pb, src16[5]);
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bytestream2_put_be16u(&pb, src16[7]);
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bytestream2_put_be16u(&pb, src16[3]);
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src16 += 8;
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} while (--samples);
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} else {
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do {
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bytestream2_put_be24u(&pb, src32[0]);
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bytestream2_put_be24u(&pb, src32[1]);
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bytestream2_put_be24u(&pb, src32[2]);
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bytestream2_put_be24u(&pb, src32[6]);
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bytestream2_put_be24u(&pb, src32[4]);
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bytestream2_put_be24u(&pb, src32[5]);
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bytestream2_put_be24u(&pb, src32[7]);
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bytestream2_put_be24u(&pb, src32[3]);
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src32 += 8;
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} while (--samples);
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}
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break;
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default:
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return AVERROR_BUG;
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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_pcm_bluray_encoder = {
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.p.name = "pcm_bluray",
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CODEC_LONG_NAME("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_PCM_BLURAY,
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.priv_data_size = sizeof(BlurayPCMEncContext),
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.init = pcm_bluray_encode_init,
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FF_CODEC_ENCODE_CB(pcm_bluray_encode_frame),
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.p.supported_samplerates = (const int[]) { 48000, 96000, 192000, 0 },
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.p.ch_layouts = (const AVChannelLayout[]) {
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AV_CHANNEL_LAYOUT_MONO,
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AV_CHANNEL_LAYOUT_STEREO,
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AV_CHANNEL_LAYOUT_SURROUND,
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AV_CHANNEL_LAYOUT_2_1,
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AV_CHANNEL_LAYOUT_4POINT0,
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AV_CHANNEL_LAYOUT_2_2,
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AV_CHANNEL_LAYOUT_5POINT0,
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AV_CHANNEL_LAYOUT_5POINT1,
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AV_CHANNEL_LAYOUT_7POINT0,
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AV_CHANNEL_LAYOUT_7POINT1,
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{ 0 } },
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.p.sample_fmts = (const enum AVSampleFormat[]) {
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AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE },
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
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};
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