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ffmpeg / libavcodec / dpxenc.c @ e27ce0ee

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