Split the decoders from pnmen.c off into their own file.

Originally committed as revision 20394 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 234 insertions, 0 deletions

diff --git a/libavcodec/pnmdec.c b/libavcodec/pnmdec.c
new file mode 100644
index 0000000000..f29c873200
--- /dev/null
+++ b/libavcodec/pnmdec.c
@@ -0,0 +1,234 @@
+/*
+ * PNM image format
+ * 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 "avcodec.h"
+#include "bytestream.h"
+#include "pnm.h"
+
+
+static int pnm_decode_frame(AVCodecContext *avctx, void *data,
+                            int *data_size, AVPacket *avpkt)
+{
+    const uint8_t *buf   = avpkt->data;
+    int buf_size         = avpkt->size;
+    PNMContext * const s = avctx->priv_data;
+    AVFrame *picture     = data;
+    AVFrame * const p    = (AVFrame*)&s->picture;
+    int i, n, linesize, h, upgrade = 0;
+    unsigned char *ptr;
+
+    s->bytestream_start =
+    s->bytestream       = buf;
+    s->bytestream_end   = buf + buf_size;
+
+    if (ff_pnm_decode_header(avctx, s) < 0)
+        return -1;
+
+    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;
+
+    switch (avctx->pix_fmt) {
+    default:
+        return -1;
+    case PIX_FMT_RGB48BE:
+        n = avctx->width * 6;
+        goto do_read;
+    case PIX_FMT_RGB24:
+        n = avctx->width * 3;
+        goto do_read;
+    case PIX_FMT_GRAY8:
+        n = avctx->width;
+        if (s->maxval < 255)
+            upgrade = 1;
+        goto do_read;
+    case PIX_FMT_GRAY16BE:
+    case PIX_FMT_GRAY16LE:
+        n = avctx->width * 2;
+        if (s->maxval < 65535)
+            upgrade = 2;
+        goto do_read;
+    case PIX_FMT_MONOWHITE:
+    case PIX_FMT_MONOBLACK:
+        n = (avctx->width + 7) >> 3;
+    do_read:
+        ptr      = p->data[0];
+        linesize = p->linesize[0];
+        if (s->bytestream + n * avctx->height > s->bytestream_end)
+            return -1;
+        for (i = 0; i < avctx->height; i++) {
+            if (!upgrade)
+                memcpy(ptr, s->bytestream, n);
+            else if (upgrade == 1) {
+                unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
+                for (j = 0; j < n; j++)
+                    ptr[j] = (s->bytestream[j] * f + 64) >> 7;
+            } else if (upgrade == 2) {
+                unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
+                for (j = 0; j < n / 2; j++) {
+                    v = be2me_16(((uint16_t *)s->bytestream)[j]);
+                    ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
+                }
+            }
+            s->bytestream += n;
+            ptr           += linesize;
+        }
+        break;
+    case PIX_FMT_YUV420P:
+        {
+            unsigned char *ptr1, *ptr2;
+
+            n        = avctx->width;
+            ptr      = p->data[0];
+            linesize = p->linesize[0];
+            if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
+                return -1;
+            for (i = 0; i < avctx->height; i++) {
+                memcpy(ptr, s->bytestream, n);
+                s->bytestream += n;
+                ptr           += linesize;
+            }
+            ptr1 = p->data[1];
+            ptr2 = p->data[2];
+            n >>= 1;
+            h = avctx->height >> 1;
+            for (i = 0; i < h; i++) {
+                memcpy(ptr1, s->bytestream, n);
+                s->bytestream += n;
+                memcpy(ptr2, s->bytestream, n);
+                s->bytestream += n;
+                ptr1 += p->linesize[1];
+                ptr2 += p->linesize[2];
+            }
+        }
+        break;
+    case PIX_FMT_RGB32:
+        ptr      = p->data[0];
+        linesize = p->linesize[0];
+        if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
+            return -1;
+        for (i = 0; i < avctx->height; i++) {
+            int j, r, g, b, a;
+
+            for (j = 0; j < avctx->width; j++) {
+                r = *s->bytestream++;
+                g = *s->bytestream++;
+                b = *s->bytestream++;
+                a = *s->bytestream++;
+                ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
+            }
+            ptr += linesize;
+        }
+        break;
+    }
+    *picture   = *(AVFrame*)&s->picture;
+    *data_size = sizeof(AVPicture);
+
+    return s->bytestream - s->bytestream_start;
+}
+
+
+#if CONFIG_PGM_DECODER
+AVCodec pgm_decoder = {
+    "pgm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PGM,
+    sizeof(PNMContext),
+    ff_pnm_init,
+    NULL,
+    ff_pnm_end,
+    pnm_decode_frame,
+    CODEC_CAP_DR1,
+    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
+};
+#endif
+
+#if CONFIG_PGMYUV_DECODER
+AVCodec pgmyuv_decoder = {
+    "pgmyuv",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PGMYUV,
+    sizeof(PNMContext),
+    ff_pnm_init,
+    NULL,
+    ff_pnm_end,
+    pnm_decode_frame,
+    CODEC_CAP_DR1,
+    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
+};
+#endif
+
+#if CONFIG_PPM_DECODER
+AVCodec ppm_decoder = {
+    "ppm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PPM,
+    sizeof(PNMContext),
+    ff_pnm_init,
+    NULL,
+    ff_pnm_end,
+    pnm_decode_frame,
+    CODEC_CAP_DR1,
+    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
+};
+#endif
+
+#if CONFIG_PBM_DECODER
+AVCodec pbm_decoder = {
+    "pbm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PBM,
+    sizeof(PNMContext),
+    ff_pnm_init,
+    NULL,
+    ff_pnm_end,
+    pnm_decode_frame,
+    CODEC_CAP_DR1,
+    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
+};
+#endif
+
+#if CONFIG_PAM_DECODER
+AVCodec pam_decoder = {
+    "pam",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PAM,
+    sizeof(PNMContext),
+    ff_pnm_init,
+    NULL,
+    ff_pnm_end,
+    pnm_decode_frame,
+    CODEC_CAP_DR1,
+    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
+};
+#endif