| /* |
| * bitpacked encoder |
| * |
| * Copyright (c) 2021 Limin Wang |
| * |
| * 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 "avcodec.h" |
| #include "codec_internal.h" |
| #include "encode.h" |
| #include "internal.h" |
| #include "put_bits.h" |
| #include "libavutil/pixdesc.h" |
| |
| struct BitpackedContext { |
| int (*encode)(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame); |
| }; |
| |
| static int encode_yuv422p10(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame) |
| { |
| const int buf_size = avctx->height * avctx->width * avctx->bits_per_coded_sample / 8; |
| int ret; |
| uint8_t *dst; |
| const uint16_t *y; |
| const uint16_t *u; |
| const uint16_t *v; |
| PutBitContext pb; |
| |
| ret = ff_get_encode_buffer(avctx, pkt, buf_size, 0); |
| if (ret < 0) { |
| av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n"); |
| return ret; |
| } |
| dst = pkt->data; |
| |
| init_put_bits(&pb, dst, buf_size); |
| |
| for (int i = 0; i < avctx->height; i++) { |
| y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]); |
| u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]); |
| v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]); |
| |
| for (int j = 0; j < avctx->width; j += 2) { |
| /* u, y0, v, y1 */ |
| put_bits(&pb, 10, av_clip_uintp2(*u++, 10)); |
| put_bits(&pb, 10, av_clip_uintp2(*y++, 10)); |
| put_bits(&pb, 10, av_clip_uintp2(*v++, 10)); |
| put_bits(&pb, 10, av_clip_uintp2(*y++, 10)); |
| } |
| } |
| flush_put_bits(&pb); |
| |
| return 0; |
| } |
| |
| |
| static av_cold int encode_init(AVCodecContext *avctx) |
| { |
| struct BitpackedContext *s = avctx->priv_data; |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt); |
| |
| if (avctx->width & 1) { |
| av_log(avctx, AV_LOG_ERROR, "bitpacked needs even width\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| avctx->bits_per_coded_sample = av_get_bits_per_pixel(desc); |
| avctx->bit_rate = ff_guess_coded_bitrate(avctx); |
| |
| if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) |
| s->encode = encode_yuv422p10; |
| else |
| return AVERROR(EINVAL); |
| |
| return 0; |
| } |
| |
| static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| const AVFrame *frame, int *got_packet) |
| { |
| struct BitpackedContext *s = avctx->priv_data; |
| int ret; |
| |
| ret = s->encode(avctx, pkt, frame); |
| if (ret) |
| return ret; |
| |
| *got_packet = 1; |
| return 0; |
| } |
| |
| const FFCodec ff_bitpacked_encoder = { |
| .p.name = "bitpacked", |
| CODEC_LONG_NAME("Bitpacked"), |
| .p.type = AVMEDIA_TYPE_VIDEO, |
| .p.id = AV_CODEC_ID_BITPACKED, |
| .priv_data_size = sizeof(struct BitpackedContext), |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | |
| AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, |
| .init = encode_init, |
| FF_CODEC_ENCODE_CB(encode_frame), |
| .p.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10, |
| AV_PIX_FMT_NONE }, |
| }; |