early-access version 1432

2021-02-09 04:25:58 +01:00
parent de64eab4b4
commit 3d5a9d908a
7336 changed files with 1773492 additions and 111 deletions
--- a/externals/ffmpeg/libavcodec/pnm_parser.c
+++ b/externals/ffmpeg/libavcodec/pnm_parser.c
@@ -0,0 +1,138 @@
+/*
+ * PNM image parser
+ * Copyright (c) 2002, 2003 Fabrice Bellard
+ *
+ * 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 "libavutil/avassert.h"
+#include "libavutil/imgutils.h"
+
+#include "parser.h" //for ParseContext
+#include "pnm.h"
+
+typedef struct PNMParseContext {
+    ParseContext pc;
+    int remaining_bytes;
+    int ascii_scan;
+}PNMParseContext;
+
+static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+                     const uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size)
+{
+    PNMParseContext *pnmpc = s->priv_data;
+    ParseContext *pc = &pnmpc->pc;
+    PNMContext pnmctx;
+    int next = END_NOT_FOUND;
+    int skip = 0;
+
+    if (pc->overread > 0) {
+        memmove(pc->buffer + pc->index, pc->buffer + pc->overread_index, pc->overread);
+        pc->index          += pc->overread;
+        pc->overread_index += pc->overread;
+        pc->overread = 0;
+    }
+
+    if (pnmpc->remaining_bytes) {
+        int inc = FFMIN(pnmpc->remaining_bytes, buf_size);
+        skip += inc;
+        pnmpc->remaining_bytes -= inc;
+
+        if (!pnmpc->remaining_bytes)
+            next = skip;
+        goto end;
+    }
+
+retry:
+    if (pc->index) {
+        pnmctx.bytestream_start =
+        pnmctx.bytestream       = pc->buffer;
+        pnmctx.bytestream_end   = pc->buffer + pc->index;
+    } else {
+        pnmctx.bytestream_start =
+        pnmctx.bytestream       = (uint8_t *) buf + skip; /* casts avoid warnings */
+        pnmctx.bytestream_end   = (uint8_t *) buf + buf_size - skip;
+    }
+    if (ff_pnm_decode_header(avctx, &pnmctx) < 0) {
+        if (pnmctx.bytestream < pnmctx.bytestream_end) {
+            if (pc->index) {
+                pc->index = 0;
+                pnmpc->ascii_scan = 0;
+            } else {
+                unsigned step = FFMAX(1, pnmctx.bytestream - pnmctx.bytestream_start);
+
+                skip += step;
+            }
+            goto retry;
+        }
+    } else if (pnmctx.type < 4) {
+              uint8_t *bs  = pnmctx.bytestream;
+        const uint8_t *end = pnmctx.bytestream_end;
+        uint8_t *sync      = bs;
+
+        if (pc->index) {
+            av_assert0(pnmpc->ascii_scan <= end - bs);
+            bs += pnmpc->ascii_scan;
+        }
+
+        while (bs < end) {
+            int c;
+            sync = bs;
+            c = *bs++;
+            if (c == '#')  {
+                uint8_t *match = memchr(bs, '\n', end-bs);
+                if (match)
+                    bs = match + 1;
+                else
+                    break;
+            } else if (c == 'P') {
+                next = bs - pnmctx.bytestream_start + skip - 1;
+                pnmpc->ascii_scan = 0;
+                break;
+            }
+        }
+        if (next == END_NOT_FOUND)
+            pnmpc->ascii_scan = sync - pnmctx.bytestream + skip;
+    } else {
+        next = pnmctx.bytestream - pnmctx.bytestream_start + skip
+               + av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1);
+    }
+    if (next != END_NOT_FOUND && pnmctx.bytestream_start != buf + skip)
+        next -= pc->index;
+    if (next > buf_size) {
+        pnmpc->remaining_bytes = next - buf_size;
+        next = END_NOT_FOUND;
+    }
+end:
+    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_pnm_parser = {
+    .codec_ids      = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM,
+                        AV_CODEC_ID_PBM, AV_CODEC_ID_PAM },
+    .priv_data_size = sizeof(PNMParseContext),
+    .parser_parse   = pnm_parse,
+    .parser_close   = ff_parse_close,
+};