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Diffstat (limited to 'contrib/ffmpeg/libavcodec/cinepak.c')
-rw-r--r--contrib/ffmpeg/libavcodec/cinepak.c453
1 files changed, 453 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/cinepak.c b/contrib/ffmpeg/libavcodec/cinepak.c
new file mode 100644
index 000000000..e137377e5
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/cinepak.c
@@ -0,0 +1,453 @@
+/*
+ * Cinepak Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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
+ *
+ */
+
+/**
+ * @file cinepak.c
+ * Cinepak video decoder
+ * by Ewald Snel <ewald@rambo.its.tudelft.nl>
+ * For more information on the Cinepak algorithm, visit:
+ * http://www.csse.monash.edu.au/~timf/
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+
+typedef struct {
+ uint8_t y0, y1, y2, y3;
+ uint8_t u, v;
+} cvid_codebook_t;
+
+#define MAX_STRIPS 32
+
+typedef struct {
+ uint16_t id;
+ uint16_t x1, y1;
+ uint16_t x2, y2;
+ cvid_codebook_t v4_codebook[256];
+ cvid_codebook_t v1_codebook[256];
+} cvid_strip_t;
+
+typedef struct CinepakContext {
+
+ AVCodecContext *avctx;
+ DSPContext dsp;
+ AVFrame frame;
+
+ unsigned char *data;
+ int size;
+
+ int width, height;
+
+ int palette_video;
+ cvid_strip_t strips[MAX_STRIPS];
+
+} CinepakContext;
+
+static void cinepak_decode_codebook (cvid_codebook_t *codebook,
+ int chunk_id, int size, uint8_t *data)
+{
+ uint8_t *eod = (data + size);
+ uint32_t flag, mask;
+ int i, n;
+
+ /* check if this chunk contains 4- or 6-element vectors */
+ n = (chunk_id & 0x0400) ? 4 : 6;
+ flag = 0;
+ mask = 0;
+
+ for (i=0; i < 256; i++) {
+ if ((chunk_id & 0x0100) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ break;
+
+ flag = BE_32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if (!(chunk_id & 0x0100) || (flag & mask)) {
+ if ((data + n) > eod)
+ break;
+
+ if (n == 6) {
+ codebook[i].y0 = *data++;
+ codebook[i].y1 = *data++;
+ codebook[i].y2 = *data++;
+ codebook[i].y3 = *data++;
+ codebook[i].u = 128 + *data++;
+ codebook[i].v = 128 + *data++;
+ } else {
+ /* this codebook type indicates either greyscale or
+ * palettized video; if palettized, U & V components will
+ * not be used so it is safe to set them to 128 for the
+ * benefit of greyscale rendering in YUV420P */
+ codebook[i].y0 = *data++;
+ codebook[i].y1 = *data++;
+ codebook[i].y2 = *data++;
+ codebook[i].y3 = *data++;
+ codebook[i].u = 128;
+ codebook[i].v = 128;
+ }
+ }
+ }
+}
+
+static int cinepak_decode_vectors (CinepakContext *s, cvid_strip_t *strip,
+ int chunk_id, int size, uint8_t *data)
+{
+ uint8_t *eod = (data + size);
+ uint32_t flag, mask;
+ cvid_codebook_t *codebook;
+ unsigned int x, y;
+ uint32_t iy[4];
+ uint32_t iu[2];
+ uint32_t iv[2];
+
+ flag = 0;
+ mask = 0;
+
+ for (y=strip->y1; y < strip->y2; y+=4) {
+
+ iy[0] = strip->x1 + (y * s->frame.linesize[0]);
+ iy[1] = iy[0] + s->frame.linesize[0];
+ iy[2] = iy[1] + s->frame.linesize[0];
+ iy[3] = iy[2] + s->frame.linesize[0];
+ iu[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[1]);
+ iu[1] = iu[0] + s->frame.linesize[1];
+ iv[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[2]);
+ iv[1] = iv[0] + s->frame.linesize[2];
+
+ for (x=strip->x1; x < strip->x2; x+=4) {
+ if ((chunk_id & 0x0100) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ return -1;
+
+ flag = BE_32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if (!(chunk_id & 0x0100) || (flag & mask)) {
+ if (!(chunk_id & 0x0200) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ return -1;
+
+ flag = BE_32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if ((chunk_id & 0x0200) || (~flag & mask)) {
+ if (data >= eod)
+ return -1;
+
+ codebook = &strip->v1_codebook[*data++];
+ s->frame.data[0][iy[0] + 0] = codebook->y0;
+ s->frame.data[0][iy[0] + 1] = codebook->y0;
+ s->frame.data[0][iy[1] + 0] = codebook->y0;
+ s->frame.data[0][iy[1] + 1] = codebook->y0;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[0]] = codebook->u;
+ s->frame.data[2][iv[0]] = codebook->v;
+ }
+
+ s->frame.data[0][iy[0] + 2] = codebook->y1;
+ s->frame.data[0][iy[0] + 3] = codebook->y1;
+ s->frame.data[0][iy[1] + 2] = codebook->y1;
+ s->frame.data[0][iy[1] + 3] = codebook->y1;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[0] + 1] = codebook->u;
+ s->frame.data[2][iv[0] + 1] = codebook->v;
+ }
+
+ s->frame.data[0][iy[2] + 0] = codebook->y2;
+ s->frame.data[0][iy[2] + 1] = codebook->y2;
+ s->frame.data[0][iy[3] + 0] = codebook->y2;
+ s->frame.data[0][iy[3] + 1] = codebook->y2;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[1]] = codebook->u;
+ s->frame.data[2][iv[1]] = codebook->v;
+ }
+
+ s->frame.data[0][iy[2] + 2] = codebook->y3;
+ s->frame.data[0][iy[2] + 3] = codebook->y3;
+ s->frame.data[0][iy[3] + 2] = codebook->y3;
+ s->frame.data[0][iy[3] + 3] = codebook->y3;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[1] + 1] = codebook->u;
+ s->frame.data[2][iv[1] + 1] = codebook->v;
+ }
+
+ } else if (flag & mask) {
+ if ((data + 4) > eod)
+ return -1;
+
+ codebook = &strip->v4_codebook[*data++];
+ s->frame.data[0][iy[0] + 0] = codebook->y0;
+ s->frame.data[0][iy[0] + 1] = codebook->y1;
+ s->frame.data[0][iy[1] + 0] = codebook->y2;
+ s->frame.data[0][iy[1] + 1] = codebook->y3;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[0]] = codebook->u;
+ s->frame.data[2][iv[0]] = codebook->v;
+ }
+
+ codebook = &strip->v4_codebook[*data++];
+ s->frame.data[0][iy[0] + 2] = codebook->y0;
+ s->frame.data[0][iy[0] + 3] = codebook->y1;
+ s->frame.data[0][iy[1] + 2] = codebook->y2;
+ s->frame.data[0][iy[1] + 3] = codebook->y3;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[0] + 1] = codebook->u;
+ s->frame.data[2][iv[0] + 1] = codebook->v;
+ }
+
+ codebook = &strip->v4_codebook[*data++];
+ s->frame.data[0][iy[2] + 0] = codebook->y0;
+ s->frame.data[0][iy[2] + 1] = codebook->y1;
+ s->frame.data[0][iy[3] + 0] = codebook->y2;
+ s->frame.data[0][iy[3] + 1] = codebook->y3;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[1]] = codebook->u;
+ s->frame.data[2][iv[1]] = codebook->v;
+ }
+
+ codebook = &strip->v4_codebook[*data++];
+ s->frame.data[0][iy[2] + 2] = codebook->y0;
+ s->frame.data[0][iy[2] + 3] = codebook->y1;
+ s->frame.data[0][iy[3] + 2] = codebook->y2;
+ s->frame.data[0][iy[3] + 3] = codebook->y3;
+ if (!s->palette_video) {
+ s->frame.data[1][iu[1] + 1] = codebook->u;
+ s->frame.data[2][iv[1] + 1] = codebook->v;
+ }
+
+ }
+ }
+
+ iy[0] += 4; iy[1] += 4;
+ iy[2] += 4; iy[3] += 4;
+ iu[0] += 2; iu[1] += 2;
+ iv[0] += 2; iv[1] += 2;
+ }
+ }
+
+ return 0;
+}
+
+static int cinepak_decode_strip (CinepakContext *s,
+ cvid_strip_t *strip, uint8_t *data, int size)
+{
+ uint8_t *eod = (data + size);
+ int chunk_id, chunk_size;
+
+ /* coordinate sanity checks */
+ if (strip->x1 >= s->width || strip->x2 > s->width ||
+ strip->y1 >= s->height || strip->y2 > s->height ||
+ strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
+ return -1;
+
+ while ((data + 4) <= eod) {
+ chunk_id = BE_16 (&data[0]);
+ chunk_size = BE_16 (&data[2]) - 4;
+ if(chunk_size < 0)
+ return -1;
+
+ data += 4;
+ chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
+
+ switch (chunk_id) {
+
+ case 0x2000:
+ case 0x2100:
+ case 0x2400:
+ case 0x2500:
+ cinepak_decode_codebook (strip->v4_codebook, chunk_id,
+ chunk_size, data);
+ break;
+
+ case 0x2200:
+ case 0x2300:
+ case 0x2600:
+ case 0x2700:
+ cinepak_decode_codebook (strip->v1_codebook, chunk_id,
+ chunk_size, data);
+ break;
+
+ case 0x3000:
+ case 0x3100:
+ case 0x3200:
+ return cinepak_decode_vectors (s, strip, chunk_id,
+ chunk_size, data);
+ }
+
+ data += chunk_size;
+ }
+
+ return -1;
+}
+
+static int cinepak_decode (CinepakContext *s)
+{
+ uint8_t *eod = (s->data + s->size);
+ int i, result, strip_size, frame_flags, num_strips;
+ int y0 = 0;
+ int encoded_buf_size;
+ /* if true, Cinepak data is from a Sega FILM/CPK file */
+ int sega_film_data = 0;
+
+ if (s->size < 10)
+ return -1;
+
+ frame_flags = s->data[0];
+ num_strips = BE_16 (&s->data[8]);
+ encoded_buf_size = ((s->data[1] << 16) | BE_16 (&s->data[2]));
+ if (encoded_buf_size != s->size)
+ sega_film_data = 1;
+ if (sega_film_data)
+ s->data += 12;
+ else
+ s->data += 10;
+
+ if (num_strips > MAX_STRIPS)
+ num_strips = MAX_STRIPS;
+
+ for (i=0; i < num_strips; i++) {
+ if ((s->data + 12) > eod)
+ return -1;
+
+ s->strips[i].id = BE_16 (s->data);
+ s->strips[i].y1 = y0;
+ s->strips[i].x1 = 0;
+ s->strips[i].y2 = y0 + BE_16 (&s->data[8]);
+ s->strips[i].x2 = s->avctx->width;
+
+ strip_size = BE_16 (&s->data[2]) - 12;
+ s->data += 12;
+ strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
+
+ if ((i > 0) && !(frame_flags & 0x01)) {
+ memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
+ sizeof(s->strips[i].v4_codebook));
+ memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
+ sizeof(s->strips[i].v1_codebook));
+ }
+
+ result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
+
+ if (result != 0)
+ return result;
+
+ s->data += strip_size;
+ y0 = s->strips[i].y2;
+ }
+ return 0;
+}
+
+static int cinepak_decode_init(AVCodecContext *avctx)
+{
+ CinepakContext *s = (CinepakContext *)avctx->priv_data;
+
+ s->avctx = avctx;
+ s->width = (avctx->width + 3) & ~3;
+ s->height = (avctx->height + 3) & ~3;
+
+ // check for paletted data
+ if ((avctx->palctrl == NULL) || (avctx->bits_per_sample == 40)) {
+ s->palette_video = 0;
+ avctx->pix_fmt = PIX_FMT_YUV420P;
+ } else {
+ s->palette_video = 1;
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ }
+
+ avctx->has_b_frames = 0;
+ dsputil_init(&s->dsp, avctx);
+
+ s->frame.data[0] = NULL;
+
+ return 0;
+}
+
+static int cinepak_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ CinepakContext *s = (CinepakContext *)avctx->priv_data;
+
+ s->data = buf;
+ s->size = buf_size;
+
+ s->frame.reference = 1;
+ s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
+ FF_BUFFER_HINTS_REUSABLE;
+ if (avctx->reget_buffer(avctx, &s->frame)) {
+ av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+ return -1;
+ }
+
+ cinepak_decode(s);
+
+ if (s->palette_video) {
+ memcpy (s->frame.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
+ if (avctx->palctrl->palette_changed) {
+ s->frame.palette_has_changed = 1;
+ avctx->palctrl->palette_changed = 0;
+ } else
+ s->frame.palette_has_changed = 0;
+ }
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->frame;
+
+ /* report that the buffer was completely consumed */
+ return buf_size;
+}
+
+static int cinepak_decode_end(AVCodecContext *avctx)
+{
+ CinepakContext *s = (CinepakContext *)avctx->priv_data;
+
+ if (s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
+
+ return 0;
+}
+
+AVCodec cinepak_decoder = {
+ "cinepak",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_CINEPAK,
+ sizeof(CinepakContext),
+ cinepak_decode_init,
+ NULL,
+ cinepak_decode_end,
+ cinepak_decode_frame,
+ CODEC_CAP_DR1,
+};
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