mirror of
https://github.com/obsproject/obs-studio.git
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274 lines
7.6 KiB
C
274 lines
7.6 KiB
C
/******************************************************************************
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Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#include <assert.h>
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#include "video-frame.h"
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#define HALF(size) ((size + 1) / 2)
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#define ALIGN(size, alignment) \
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*size = (*size + alignment - 1) & (~(alignment - 1));
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static inline void align_size(size_t *size, size_t alignment)
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{
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ALIGN(size, alignment);
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}
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static inline void align_uint32(uint32_t *size, size_t alignment)
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{
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ALIGN(size, (uint32_t)alignment);
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}
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/* assumes already-zeroed array */
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void video_frame_get_linesizes(uint32_t linesize[MAX_AV_PLANES],
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enum video_format format, uint32_t width)
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{
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switch (format) {
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default:
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case VIDEO_FORMAT_NONE:
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break;
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case VIDEO_FORMAT_BGR3: /* one plane: triple width */
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linesize[0] = width * 3;
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break;
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case VIDEO_FORMAT_RGBA: /* one plane: quadruple width */
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case VIDEO_FORMAT_BGRA:
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case VIDEO_FORMAT_BGRX:
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case VIDEO_FORMAT_AYUV:
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case VIDEO_FORMAT_R10L:
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linesize[0] = width * 4;
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break;
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case VIDEO_FORMAT_P416: /* two planes: double width, quadruple width */
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linesize[0] = width * 2;
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linesize[1] = width * 4;
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break;
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case VIDEO_FORMAT_I420: /* three planes: full width, half width, half width */
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case VIDEO_FORMAT_I422:
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linesize[0] = width;
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linesize[1] = HALF(width);
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linesize[2] = HALF(width);
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break;
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case VIDEO_FORMAT_I210: /* three planes: double width, full width, full width */
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case VIDEO_FORMAT_I010:
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linesize[0] = width * 2;
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linesize[1] = width;
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linesize[2] = width;
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break;
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case VIDEO_FORMAT_I40A: /* four planes: full width, half width, half width, full width */
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case VIDEO_FORMAT_I42A:
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linesize[0] = width;
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linesize[1] = HALF(width);
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linesize[2] = HALF(width);
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linesize[3] = width;
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break;
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case VIDEO_FORMAT_YVYU: /* one plane: double width */
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case VIDEO_FORMAT_YUY2:
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case VIDEO_FORMAT_UYVY:
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linesize[0] = width * 2;
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break;
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case VIDEO_FORMAT_P010: /* two planes: all double width */
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case VIDEO_FORMAT_P216:
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linesize[0] = width * 2;
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linesize[1] = width * 2;
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break;
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case VIDEO_FORMAT_I412: /* three planes: all double width */
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linesize[0] = width * 2;
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linesize[1] = width * 2;
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linesize[2] = width * 2;
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break;
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case VIDEO_FORMAT_YA2L: /* four planes: all double width */
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linesize[0] = width * 2;
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linesize[1] = width * 2;
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linesize[2] = width * 2;
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linesize[3] = width * 2;
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break;
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case VIDEO_FORMAT_Y800: /* one plane: full width */
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linesize[0] = width;
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break;
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case VIDEO_FORMAT_NV12: /* two planes: all full width */
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linesize[0] = width;
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linesize[1] = width;
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break;
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case VIDEO_FORMAT_I444: /* three planes: all full width */
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linesize[0] = width;
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linesize[1] = width;
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linesize[2] = width;
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break;
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case VIDEO_FORMAT_YUVA: /* four planes: all full width */
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linesize[0] = width;
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linesize[1] = width;
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linesize[2] = width;
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linesize[3] = width;
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break;
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case VIDEO_FORMAT_V210: { /* one plane: bruh (Little Endian Compressed) */
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align_uint32(&width, 48);
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linesize[0] = ((width + 5) / 6) * 16;
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break;
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}
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}
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}
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void video_frame_get_plane_heights(uint32_t heights[MAX_AV_PLANES],
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enum video_format format, uint32_t height)
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{
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switch (format) {
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default:
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case VIDEO_FORMAT_NONE:
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return;
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case VIDEO_FORMAT_I420: /* three planes: full height, half height, half height */
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case VIDEO_FORMAT_I010:
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heights[0] = height;
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heights[1] = height / 2;
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heights[2] = height / 2;
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break;
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case VIDEO_FORMAT_NV12: /* two planes: full height, half height */
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case VIDEO_FORMAT_P010:
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heights[0] = height;
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heights[1] = height / 2;
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break;
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case VIDEO_FORMAT_Y800: /* one plane: full height */
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case VIDEO_FORMAT_YVYU:
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case VIDEO_FORMAT_YUY2:
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case VIDEO_FORMAT_UYVY:
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case VIDEO_FORMAT_RGBA:
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case VIDEO_FORMAT_BGRA:
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case VIDEO_FORMAT_BGRX:
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case VIDEO_FORMAT_BGR3:
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case VIDEO_FORMAT_AYUV:
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case VIDEO_FORMAT_V210:
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case VIDEO_FORMAT_R10L:
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heights[0] = height;
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break;
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case VIDEO_FORMAT_I444: /* three planes: all full height */
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case VIDEO_FORMAT_I422:
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case VIDEO_FORMAT_I210:
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case VIDEO_FORMAT_I412:
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heights[0] = height;
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heights[1] = height;
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heights[2] = height;
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break;
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case VIDEO_FORMAT_I40A: /* four planes: full height, half height, half height, full height */
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heights[0] = height;
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heights[1] = height / 2;
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heights[2] = height / 2;
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heights[3] = height;
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break;
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case VIDEO_FORMAT_I42A: /* four planes: all full height */
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case VIDEO_FORMAT_YUVA:
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case VIDEO_FORMAT_YA2L:
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heights[0] = height;
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heights[1] = height;
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heights[2] = height;
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heights[3] = height;
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break;
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case VIDEO_FORMAT_P216: /* two planes: all full height */
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case VIDEO_FORMAT_P416:
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heights[0] = height;
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heights[1] = height;
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break;
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}
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}
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void video_frame_init(struct video_frame *frame, enum video_format format,
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uint32_t width, uint32_t height)
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{
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size_t size = 0;
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uint32_t linesizes[MAX_AV_PLANES];
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uint32_t heights[MAX_AV_PLANES];
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size_t offsets[MAX_AV_PLANES];
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int alignment = base_get_alignment();
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if (!frame)
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return;
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memset(frame, 0, sizeof(struct video_frame));
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memset(linesizes, 0, sizeof(linesizes));
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memset(heights, 0, sizeof(heights));
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memset(offsets, 0, sizeof(offsets));
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/* determine linesizes for each plane */
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video_frame_get_linesizes(linesizes, format, width);
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/* determine line count for each plane */
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video_frame_get_plane_heights(heights, format, height);
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/* calculate total buffer required */
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for (uint32_t i = 0; i < MAX_AV_PLANES; i++) {
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if (!linesizes[i] || !heights[i])
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continue;
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size_t plane_size = (size_t)linesizes[i] * (size_t)heights[i];
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align_size(&plane_size, alignment);
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size += plane_size;
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offsets[i] = size;
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}
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/* allocate memory */
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frame->data[0] = bmalloc(size);
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frame->linesize[0] = linesizes[0];
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/* apply plane data pointers according to offsets */
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for (uint32_t i = 1; i < MAX_AV_PLANES; i++) {
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if (!linesizes[i] || !heights[i])
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continue;
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frame->data[i] = frame->data[0] + offsets[i - 1];
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frame->linesize[i] = linesizes[i];
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}
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}
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void video_frame_copy(struct video_frame *dst, const struct video_frame *src,
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enum video_format format, uint32_t cy)
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{
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uint32_t heights[MAX_AV_PLANES];
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memset(heights, 0, sizeof(heights));
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/* determine line count for each plane */
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video_frame_get_plane_heights(heights, format, cy);
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/* copy each plane */
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for (uint32_t i = 0; i < MAX_AV_PLANES; i++) {
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if (!heights[i])
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continue;
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if (src->linesize[i] == dst->linesize[i]) {
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memcpy(dst->data[i], src->data[i],
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src->linesize[i] * heights[i]);
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} else { /* linesizes which do not match must be copied line-by-line */
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size_t src_linesize = src->linesize[i];
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size_t dst_linesize = dst->linesize[i];
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/* determine how much we can write (frames with different line sizes require more )*/
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size_t linesize = src_linesize < dst_linesize
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? src_linesize
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: dst_linesize;
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for (uint32_t y = 0; y < heights[i]; y++) {
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uint8_t *src_pos =
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src->data[i] + (src_linesize * y);
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uint8_t *dst_pos =
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dst->data[i] + (dst_linesize * y);
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memcpy(dst_pos, src_pos, linesize);
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}
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}
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}
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}
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