From e27ce0eea36b7631ad26a8f41b93855e3ae7e8f9 Mon Sep 17 00:00:00 2001 From: Peter Ross Date: Sat, 26 Mar 2011 15:12:35 +1100 Subject: DPX image encoder --- libavcodec/dpxenc.c | 178 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 libavcodec/dpxenc.c (limited to 'libavcodec/dpxenc.c') diff --git a/libavcodec/dpxenc.c b/libavcodec/dpxenc.c new file mode 100644 index 0000000000..bb783e2d9c --- /dev/null +++ b/libavcodec/dpxenc.c @@ -0,0 +1,178 @@ +/* + * DPX (.dpx) image encoder + * Copyright (c) 2011 Peter Ross + * + * 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 + */ + +#include "libavutil/intreadwrite.h" +#include "libavutil/imgutils.h" +#include "avcodec.h" + +typedef struct DPXContext { + AVFrame picture; + int big_endian; + int bits_per_component; + int descriptor; +} DPXContext; + +static av_cold int encode_init(AVCodecContext *avctx) +{ + DPXContext *s = avctx->priv_data; + + avctx->coded_frame = &s->picture; + avctx->coded_frame->pict_type = FF_I_TYPE; + avctx->coded_frame->key_frame = 1; + + s->big_endian = 1; + s->bits_per_component = 8; + s->descriptor = 50; /* RGB */ + + switch (avctx->pix_fmt) { + case PIX_FMT_RGB24: + break; + case PIX_FMT_RGBA: + s->descriptor = 51; /* RGBA */ + break; + case PIX_FMT_RGB48LE: + s->big_endian = 0; + case PIX_FMT_RGB48BE: + s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16; + break; + default: + av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); + return -1; + } + + return 0; +} + +#define write16(p, value) \ +do { \ + if (s->big_endian) AV_WB16(p, value); \ + else AV_WL16(p, value); \ +} while(0) + +#define write32(p, value) \ +do { \ + if (s->big_endian) AV_WB32(p, value); \ + else AV_WL32(p, value); \ +} while(0) + +static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic, + uint8_t *dst) +{ + DPXContext *s = avctx->priv_data; + const uint8_t *src = pic->data[0]; + int x, y; + + for (y = 0; y < avctx->height; y++) { + for (x = 0; x < avctx->width; x++) { + int value; + if ((avctx->pix_fmt & 1)) { + value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4) + | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6) + | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16); + } else { + value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4) + | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6) + | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16); + } + write32(dst, value); + dst += 4; + } + src += pic->linesize[0]; + } +} + +static int encode_frame(AVCodecContext *avctx, unsigned char *buf, + int buf_size, void *data) +{ + DPXContext *s = avctx->priv_data; + int size; + +#define HEADER_SIZE 1664 /* DPX Generic header */ + if (buf_size < HEADER_SIZE) + return -1; + + memset(buf, 0, HEADER_SIZE); + + /* File information header */ + write32(buf, MKBETAG('S','D','P','X')); + write32(buf + 4, HEADER_SIZE); + memcpy (buf + 8, "V1.0", 4); + write32(buf + 20, 1); /* new image */ + write32(buf + 24, HEADER_SIZE); + memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100)); + write32(buf + 660, 0xFFFFFFFF); /* unencrypted */ + + /* Image information header */ + write16(buf + 768, 0); /* orientation; left to right, top to bottom */ + write16(buf + 770, 1); /* number of elements */ + write32(buf + 772, avctx->width); + write32(buf + 776, avctx->height); + buf[800] = s->descriptor; + buf[801] = 2; /* linear transfer */ + buf[802] = 2; /* linear colorimetric */ + buf[803] = s->bits_per_component; + write16(buf + 804, s->bits_per_component == 10 ? 1 : 0); /* packing method */ + + /* Image source information header */ + write32(buf + 1628, avctx->sample_aspect_ratio.num); + write32(buf + 1632, avctx->sample_aspect_ratio.den); + + switch (s->bits_per_component) { + case 8: + case 16: + size = avpicture_layout(data, avctx->pix_fmt, + avctx->width, avctx->height, + buf + HEADER_SIZE, buf_size - HEADER_SIZE); + if (size < 0) + return size; + break; + case 10: + size = avctx->height * avctx->width * 4; + if (buf_size < HEADER_SIZE + size) + return -1; + encode_rgb48_10bit(avctx, data, buf + HEADER_SIZE); + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component); + return -1; + } + + size += HEADER_SIZE; + + write32(buf + 16, size); /* file size */ + return size; +} + +AVCodec ff_dpx_encoder = { + .name = "dpx", + .type = AVMEDIA_TYPE_VIDEO, + .id = CODEC_ID_DPX, + .priv_data_size = sizeof(DPXContext), + .init = encode_init, + .decode = encode_frame, + .pix_fmts = (const enum PixelFormat[]){ + PIX_FMT_RGB24, + PIX_FMT_RGBA, + PIX_FMT_RGB48LE, + PIX_FMT_RGB48BE, + PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("DPX image"), +}; -- cgit v1.2.3