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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
302 lines
9.0 KiB
C
302 lines
9.0 KiB
C
/*
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* SGI image decoder
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* Todd Kirby <doubleshot@pacbell.net>
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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/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "internal.h"
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#include "sgi.h"
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typedef struct SgiState {
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AVCodecContext *avctx;
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unsigned int width;
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unsigned int height;
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unsigned int depth;
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unsigned int bytes_per_channel;
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int linesize;
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GetByteContext g;
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} SgiState;
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/**
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* Expand an RLE row into a channel.
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* @param s the current image state
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* @param out_buf Points to one line after the output buffer.
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* @param len length of out_buf in bytes
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* @param pixelstride pixel stride of input buffer
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* @return size of output in bytes, else return error code.
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*/
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static int expand_rle_row8(SgiState *s, uint8_t *out_buf,
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int len, int pixelstride)
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{
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unsigned char pixel, count;
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unsigned char *orig = out_buf;
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uint8_t *out_end = out_buf + len;
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while (out_buf < out_end) {
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if (bytestream2_get_bytes_left(&s->g) < 1)
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return AVERROR_INVALIDDATA;
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pixel = bytestream2_get_byteu(&s->g);
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if (!(count = (pixel & 0x7f))) {
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break;
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}
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/* Check for buffer overflow. */
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if (out_end - out_buf <= pixelstride * (count - 1)) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid pixel count.\n");
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return AVERROR_INVALIDDATA;
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}
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if (pixel & 0x80) {
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while (count--) {
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*out_buf = bytestream2_get_byte(&s->g);
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out_buf += pixelstride;
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}
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} else {
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pixel = bytestream2_get_byte(&s->g);
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while (count--) {
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*out_buf = pixel;
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out_buf += pixelstride;
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}
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}
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}
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return (out_buf - orig) / pixelstride;
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}
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static int expand_rle_row16(SgiState *s, uint16_t *out_buf,
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int len, int pixelstride)
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{
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unsigned short pixel;
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unsigned char count;
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unsigned short *orig = out_buf;
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uint16_t *out_end = out_buf + len;
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while (out_buf < out_end) {
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if (bytestream2_get_bytes_left(&s->g) < 2)
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return AVERROR_INVALIDDATA;
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pixel = bytestream2_get_be16u(&s->g);
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if (!(count = (pixel & 0x7f)))
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break;
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/* Check for buffer overflow. */
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if (out_end - out_buf <= pixelstride * (count - 1)) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid pixel count.\n");
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return AVERROR_INVALIDDATA;
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}
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if (pixel & 0x80) {
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while (count--) {
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pixel = bytestream2_get_ne16(&s->g);
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AV_WN16A(out_buf, pixel);
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out_buf += pixelstride;
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}
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} else {
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pixel = bytestream2_get_ne16(&s->g);
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while (count--) {
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AV_WN16A(out_buf, pixel);
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out_buf += pixelstride;
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}
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}
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}
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return (out_buf - orig) / pixelstride;
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}
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/**
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* Read a run length encoded SGI image.
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* @param out_buf output buffer
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* @param s the current image state
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* @return 0 if no error, else return error code.
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*/
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static int read_rle_sgi(uint8_t *out_buf, SgiState *s)
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{
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uint8_t *dest_row;
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unsigned int len = s->height * s->depth * 4;
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GetByteContext g_table = s->g;
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unsigned int y, z;
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unsigned int start_offset;
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int linesize, ret;
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/* size of RLE offset and length tables */
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if (len * 2 > bytestream2_get_bytes_left(&s->g)) {
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return AVERROR_INVALIDDATA;
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}
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for (z = 0; z < s->depth; z++) {
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dest_row = out_buf;
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for (y = 0; y < s->height; y++) {
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linesize = s->width * s->depth;
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dest_row -= s->linesize;
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start_offset = bytestream2_get_be32(&g_table);
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bytestream2_seek(&s->g, start_offset, SEEK_SET);
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if (s->bytes_per_channel == 1)
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ret = expand_rle_row8(s, dest_row + z, linesize, s->depth);
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else
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ret = expand_rle_row16(s, (uint16_t *)dest_row + z, linesize, s->depth);
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if (ret != s->width)
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return AVERROR_INVALIDDATA;
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}
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}
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return 0;
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}
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/**
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* Read an uncompressed SGI image.
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* @param out_buf output buffer
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* @param s the current image state
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* @return 0 if read success, else return error code.
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*/
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static int read_uncompressed_sgi(unsigned char *out_buf, SgiState *s)
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{
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int x, y, z;
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unsigned int offset = s->height * s->width * s->bytes_per_channel;
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GetByteContext gp[4];
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uint8_t *out_end;
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/* Test buffer size. */
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if (offset * s->depth > bytestream2_get_bytes_left(&s->g))
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return AVERROR_INVALIDDATA;
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/* Create a reader for each plane */
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for (z = 0; z < s->depth; z++) {
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gp[z] = s->g;
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bytestream2_skip(&gp[z], z * offset);
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}
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for (y = s->height - 1; y >= 0; y--) {
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out_end = out_buf + (y * s->linesize);
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if (s->bytes_per_channel == 1) {
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for (x = s->width; x > 0; x--)
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for (z = 0; z < s->depth; z++)
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*out_end++ = bytestream2_get_byteu(&gp[z]);
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} else {
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uint16_t *out16 = (uint16_t *)out_end;
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for (x = s->width; x > 0; x--)
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for (z = 0; z < s->depth; z++)
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*out16++ = bytestream2_get_ne16u(&gp[z]);
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}
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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SgiState *s = avctx->priv_data;
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AVFrame *p = data;
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unsigned int dimension, rle;
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int ret = 0;
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uint8_t *out_buf, *out_end;
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bytestream2_init(&s->g, avpkt->data, avpkt->size);
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if (bytestream2_get_bytes_left(&s->g) < SGI_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "buf_size too small (%d)\n", avpkt->size);
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return AVERROR_INVALIDDATA;
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}
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/* Test for SGI magic. */
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if (bytestream2_get_be16u(&s->g) != SGI_MAGIC) {
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av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
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return AVERROR_INVALIDDATA;
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}
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rle = bytestream2_get_byteu(&s->g);
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s->bytes_per_channel = bytestream2_get_byteu(&s->g);
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dimension = bytestream2_get_be16u(&s->g);
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s->width = bytestream2_get_be16u(&s->g);
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s->height = bytestream2_get_be16u(&s->g);
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s->depth = bytestream2_get_be16u(&s->g);
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if (s->bytes_per_channel != 1 && s->bytes_per_channel != 2) {
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av_log(avctx, AV_LOG_ERROR, "wrong channel number\n");
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return AVERROR_INVALIDDATA;
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}
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/* Check for supported image dimensions. */
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if (dimension != 2 && dimension != 3) {
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av_log(avctx, AV_LOG_ERROR, "wrong dimension number\n");
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return AVERROR_INVALIDDATA;
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}
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if (s->depth == SGI_GRAYSCALE) {
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avctx->pix_fmt = s->bytes_per_channel == 2 ? AV_PIX_FMT_GRAY16BE : AV_PIX_FMT_GRAY8;
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} else if (s->depth == SGI_RGB) {
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avctx->pix_fmt = s->bytes_per_channel == 2 ? AV_PIX_FMT_RGB48BE : AV_PIX_FMT_RGB24;
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} else if (s->depth == SGI_RGBA) {
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avctx->pix_fmt = s->bytes_per_channel == 2 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGBA;
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} else {
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av_log(avctx, AV_LOG_ERROR, "wrong picture format\n");
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return AVERROR_INVALIDDATA;
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}
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ret = ff_set_dimensions(avctx, s->width, s->height);
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if (ret < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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out_buf = p->data[0];
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out_end = out_buf + p->linesize[0] * s->height;
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s->linesize = p->linesize[0];
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/* Skip header. */
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bytestream2_seek(&s->g, SGI_HEADER_SIZE, SEEK_SET);
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if (rle) {
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ret = read_rle_sgi(out_end, s);
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} else {
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ret = read_uncompressed_sgi(out_buf, s);
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}
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if (ret)
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return ret;
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int sgi_decode_init(AVCodecContext *avctx)
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{
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SgiState *s = avctx->priv_data;
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s->avctx = avctx;
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return 0;
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}
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const FFCodec ff_sgi_decoder = {
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.p.name = "sgi",
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.p.long_name = NULL_IF_CONFIG_SMALL("SGI image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_SGI,
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.priv_data_size = sizeof(SgiState),
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.decode = decode_frame,
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.init = sgi_decode_init,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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