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Diffstat (limited to 'contrib/ffmpeg/libavcodec/sgidec.c')
-rw-r--r--contrib/ffmpeg/libavcodec/sgidec.c267
1 files changed, 0 insertions, 267 deletions
diff --git a/contrib/ffmpeg/libavcodec/sgidec.c b/contrib/ffmpeg/libavcodec/sgidec.c
deleted file mode 100644
index 5a85cdcdd..000000000
--- a/contrib/ffmpeg/libavcodec/sgidec.c
+++ /dev/null
@@ -1,267 +0,0 @@
-/*
- * SGI image decoder
- * Todd Kirby <doubleshot@pacbell.net>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "avcodec.h"
-#include "bytestream.h"
-#include "sgi.h"
-
-typedef struct SgiState {
- AVFrame picture;
- unsigned int width;
- unsigned int height;
- unsigned int depth;
- int linesize;
-} SgiState;
-
-/**
- * Expand an RLE row into a channel.
- * @param in_buf input buffer
- * @param in_end end of input buffer
- * @param out_buf Points to one line after the output buffer.
- * @param out_end end of line in output buffer
- * @param pixelstride pixel stride of input buffer
- * @return size of output in bytes, -1 if buffer overflows
- */
-static int expand_rle_row(const uint8_t *in_buf, const uint8_t* in_end,
- unsigned char *out_buf, uint8_t* out_end, int pixelstride)
-{
- unsigned char pixel, count;
- unsigned char *orig = out_buf;
-
- while (1) {
- if(in_buf + 1 > in_end) return -1;
- pixel = bytestream_get_byte(&in_buf);
- if (!(count = (pixel & 0x7f))) {
- return (out_buf - orig) / pixelstride;
- }
-
- /* Check for buffer overflow. */
- if(out_buf + pixelstride * count >= out_end) return -1;
-
- if (pixel & 0x80) {
- while (count--) {
- *out_buf = bytestream_get_byte(&in_buf);
- out_buf += pixelstride;
- }
- } else {
- pixel = bytestream_get_byte(&in_buf);
-
- while (count--) {
- *out_buf = pixel;
- out_buf += pixelstride;
- }
- }
- }
-}
-
-/**
- * Read a run length encoded SGI image.
- * @param out_buf output buffer
- * @param in_buf input buffer
- * @param in_end end of input buffer
- * @param s the current image state
- * @return 0 if no error, else return error number.
- */
-static int read_rle_sgi(unsigned char* out_buf, const uint8_t *in_buf,
- const uint8_t *in_end, SgiState* s)
-{
- uint8_t *dest_row;
- unsigned int len = s->height * s->depth * 4;
- const uint8_t *start_table = in_buf;
- unsigned int y, z;
- unsigned int start_offset;
-
- /* size of RLE offset and length tables */
- if(len * 2 > in_end - in_buf) {
- return AVERROR_INVALIDDATA;
- }
-
- in_buf -= SGI_HEADER_SIZE;
- for (z = 0; z < s->depth; z++) {
- dest_row = out_buf;
- for (y = 0; y < s->height; y++) {
- dest_row -= s->linesize;
- start_offset = bytestream_get_be32(&start_table);
- if(start_offset > in_end - in_buf) {
- return AVERROR_INVALIDDATA;
- }
- if (expand_rle_row(in_buf + start_offset, in_end, dest_row + z,
- dest_row + FFABS(s->linesize), s->depth) != s->width)
- return AVERROR_INVALIDDATA;
- }
- }
- return 0;
-}
-
-/**
- * Read an uncompressed SGI image.
- * @param out_buf output buffer
- * @param out_end end ofoutput buffer
- * @param in_buf input buffer
- * @param in_end end of input buffer
- * @param s the current image state
- * @return 0 if read success, otherwise return -1.
- */
-static int read_uncompressed_sgi(unsigned char* out_buf, uint8_t* out_end,
- const uint8_t *in_buf, const uint8_t *in_end, SgiState* s)
-{
- int x, y, z;
- const uint8_t *ptr;
- unsigned int offset = s->height * s->width;
-
- /* Test buffer size. */
- if (offset * s->depth > in_end - in_buf) {
- return -1;
- }
-
- for (y = s->height - 1; y >= 0; y--) {
- out_end = out_buf + (y * s->linesize);
- for (x = s->width; x > 0; x--) {
- ptr = in_buf++;
- for(z = 0; z < s->depth; z ++) {
- bytestream_put_byte(&out_end, *ptr);
- ptr += offset;
- }
- }
- }
- return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- const uint8_t *in_buf, int buf_size)
-{
- SgiState *s = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame *p = &s->picture;
- const uint8_t *in_end = in_buf + buf_size;
- unsigned int dimension, bytes_per_channel, rle;
- int ret = 0;
- uint8_t *out_buf, *out_end;
-
- if (buf_size < SGI_HEADER_SIZE){
- av_log(avctx, AV_LOG_ERROR, "buf_size too small (%d)\n", buf_size);
- return -1;
- }
-
- /* Test for SGI magic. */
- if (bytestream_get_be16(&in_buf) != SGI_MAGIC) {
- av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
- return -1;
- }
-
- rle = bytestream_get_byte(&in_buf);
- bytes_per_channel = bytestream_get_byte(&in_buf);
- dimension = bytestream_get_be16(&in_buf);
- s->width = bytestream_get_be16(&in_buf);
- s->height = bytestream_get_be16(&in_buf);
- s->depth = bytestream_get_be16(&in_buf);
-
- if (bytes_per_channel != 1) {
- av_log(avctx, AV_LOG_ERROR, "wrong channel number\n");
- return -1;
- }
-
- /* Check for supported image dimensions. */
- if (dimension != 2 && dimension != 3) {
- av_log(avctx, AV_LOG_ERROR, "wrong dimension number\n");
- return -1;
- }
-
- if (s->depth == SGI_GRAYSCALE) {
- avctx->pix_fmt = PIX_FMT_GRAY8;
- } else if (s->depth == SGI_RGB) {
- avctx->pix_fmt = PIX_FMT_RGB24;
- } else if (s->depth == SGI_RGBA) {
- avctx->pix_fmt = PIX_FMT_RGBA;
- } else {
- av_log(avctx, AV_LOG_ERROR, "wrong picture format\n");
- return -1;
- }
-
- if (avcodec_check_dimensions(avctx, s->width, s->height))
- return -1;
- avcodec_set_dimensions(avctx, s->width, s->height);
-
- if (p->data[0])
- avctx->release_buffer(avctx, p);
-
- p->reference = 0;
- if (avctx->get_buffer(avctx, p) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed.\n");
- return -1;
- }
-
- p->pict_type = FF_I_TYPE;
- p->key_frame = 1;
- out_buf = p->data[0];
-
- out_end = out_buf + p->linesize[0] * s->height;
-
- s->linesize = p->linesize[0];
-
- /* Skip header. */
- in_buf += SGI_HEADER_SIZE - 12;
- if (rle) {
- ret = read_rle_sgi(out_end, in_buf, in_end, s);
- } else {
- ret = read_uncompressed_sgi(out_buf, out_end, in_buf, in_end, s);
- }
-
- if (ret == 0) {
- *picture = s->picture;
- *data_size = sizeof(AVPicture);
- return buf_size;
- } else {
- return -1;
- }
-}
-
-static int sgi_init(AVCodecContext *avctx){
- SgiState *s = avctx->priv_data;
-
- avcodec_get_frame_defaults(&s->picture);
- avctx->coded_frame = &s->picture;
-
- return 0;
-}
-
-static int sgi_end(AVCodecContext *avctx)
-{
- SgiState * const s = avctx->priv_data;
-
- if (s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
-
- return 0;
-}
-
-AVCodec sgi_decoder = {
- "sgi",
- CODEC_TYPE_VIDEO,
- CODEC_ID_SGI,
- sizeof(SgiState),
- sgi_init,
- NULL,
- sgi_end,
- decode_frame,
-};
-
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-03 01:32:08 +0000