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![Reinhard Tartler](/assets/img/avatar_default.png)
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
236 lines
6.7 KiB
C
236 lines
6.7 KiB
C
/*
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* DPX (.dpx) image decoder
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* Copyright (c) 2009 Jimmy Christensen
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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/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "bytestream.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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} DPXContext;
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static unsigned int read32(const uint8_t **ptr, int is_big)
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{
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unsigned int temp;
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if (is_big) {
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temp = AV_RB32(*ptr);
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} else {
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temp = AV_RL32(*ptr);
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}
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*ptr += 4;
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return temp;
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}
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static inline unsigned make_16bit(unsigned value)
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{
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// mask away invalid bits
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value &= 0xFFC0;
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// correctly expand to 16 bits
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return value + (value >> 10);
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data,
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int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + avpkt->size;
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int buf_size = avpkt->size;
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DPXContext *const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *const p = &s->picture;
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uint8_t *ptr;
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int magic_num, offset, endian;
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int x, y;
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int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
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unsigned int rgbBuffer;
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magic_num = AV_RB32(buf);
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buf += 4;
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/* Check if the files "magic number" is "SDPX" which means it uses
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* big-endian or XPDS which is for little-endian files */
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if (magic_num == AV_RL32("SDPX")) {
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endian = 0;
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} else if (magic_num == AV_RB32("SDPX")) {
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endian = 1;
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} else {
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av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
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return -1;
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}
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offset = read32(&buf, endian);
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// Need to end in 0x304 offset from start of file
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buf = avpkt->data + 0x304;
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w = read32(&buf, endian);
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h = read32(&buf, endian);
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// Need to end in 0x320 to read the descriptor
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buf += 20;
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descriptor = buf[0];
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// Need to end in 0x323 to read the bits per color
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buf += 3;
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avctx->bits_per_raw_sample =
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bits_per_color = buf[0];
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switch (descriptor) {
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case 51: // RGBA
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elements = 4;
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break;
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case 50: // RGB
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elements = 3;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
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return -1;
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}
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switch (bits_per_color) {
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case 8:
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if (elements == 4) {
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avctx->pix_fmt = PIX_FMT_RGBA;
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} else {
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avctx->pix_fmt = PIX_FMT_RGB24;
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}
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source_packet_size = elements;
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target_packet_size = elements;
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break;
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case 10:
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avctx->pix_fmt = PIX_FMT_RGB48;
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target_packet_size = 6;
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source_packet_size = elements * 2;
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break;
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case 12:
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case 16:
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if (endian) {
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avctx->pix_fmt = PIX_FMT_RGB48BE;
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} else {
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avctx->pix_fmt = PIX_FMT_RGB48LE;
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}
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target_packet_size = 6;
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source_packet_size = elements * 2;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
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return -1;
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}
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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if (av_image_check_size(w, h, 0, avctx))
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return -1;
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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// Move pointer to offset from start of file
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buf = avpkt->data + offset;
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ptr = p->data[0];
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stride = p->linesize[0];
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switch (bits_per_color) {
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case 10:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst = (uint16_t*)ptr;
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for (y = 0; y < avctx->width; y++) {
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rgbBuffer = read32(&buf, endian);
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// Read out the 10-bit colors and convert to 16-bit
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*dst++ = make_16bit(rgbBuffer >> 16);
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*dst++ = make_16bit(rgbBuffer >> 6);
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*dst++ = make_16bit(rgbBuffer << 4);
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}
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ptr += stride;
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}
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break;
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case 8:
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case 12: // Treat 12-bit as 16-bit
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case 16:
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if (source_packet_size*avctx->width*avctx->height > buf_end - buf) {
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av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
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return -1;
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}
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if (source_packet_size == target_packet_size) {
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for (x = 0; x < avctx->height; x++) {
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memcpy(ptr, buf, target_packet_size*avctx->width);
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ptr += stride;
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buf += source_packet_size*avctx->width;
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}
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} else {
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for (x = 0; x < avctx->height; x++) {
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uint8_t *dst = ptr;
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for (y = 0; y < avctx->width; y++) {
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memcpy(dst, buf, target_packet_size);
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dst += target_packet_size;
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buf += source_packet_size;
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}
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ptr += stride;
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}
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}
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break;
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}
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*picture = s->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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DPXContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame = &s->picture;
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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DPXContext *s = avctx->priv_data;
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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AVCodec ff_dpx_decoder = {
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"dpx",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_DPX,
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sizeof(DPXContext),
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decode_init,
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NULL,
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decode_end,
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decode_frame,
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0,
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NULL,
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.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
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};
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