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Diffstat (limited to 'ffmpeg1/libavcodec/cinepak.c')
-rw-r--r--ffmpeg1/libavcodec/cinepak.c488
1 files changed, 488 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/cinepak.c b/ffmpeg1/libavcodec/cinepak.c
new file mode 100644
index 0000000..f5bc113
--- /dev/null
+++ b/ffmpeg1/libavcodec/cinepak.c
@@ -0,0 +1,488 @@
+/*
+ * 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 video decoder
+ * @author Ewald Snel <ewald@rambo.its.tudelft.nl>
+ *
+ * @see For more information on the Cinepak algorithm, visit:
+ * http://www.csse.monash.edu.au/~timf/
+ * @see For more information on the quirky data inside Sega FILM/CPK files, visit:
+ * http://wiki.multimedia.cx/index.php?title=Sega_FILM
+ *
+ * Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
+ * @author Cinepak colorspace, Rl, Aetey Global Technologies AB
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "internal.h"
+
+
+typedef uint8_t cvid_codebook[12];
+
+#define MAX_STRIPS 32
+
+typedef struct {
+ uint16_t id;
+ uint16_t x1, y1;
+ uint16_t x2, y2;
+ cvid_codebook v4_codebook[256];
+ cvid_codebook v1_codebook[256];
+} cvid_strip;
+
+typedef struct CinepakContext {
+
+ AVCodecContext *avctx;
+ AVFrame *frame;
+
+ const unsigned char *data;
+ int size;
+
+ int width, height;
+
+ int palette_video;
+ cvid_strip strips[MAX_STRIPS];
+
+ int sega_film_skip_bytes;
+
+ uint32_t pal[256];
+} CinepakContext;
+
+static void cinepak_decode_codebook (cvid_codebook *codebook,
+ int chunk_id, int size, const uint8_t *data)
+{
+ const uint8_t *eod = (data + size);
+ uint32_t flag, mask;
+ int i, n;
+ uint8_t *p;
+
+ /* check if this chunk contains 4- or 6-element vectors */
+ n = (chunk_id & 0x04) ? 4 : 6;
+ flag = 0;
+ mask = 0;
+
+ p = codebook[0];
+ for (i=0; i < 256; i++) {
+ if ((chunk_id & 0x01) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ break;
+
+ flag = AV_RB32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if (!(chunk_id & 0x01) || (flag & mask)) {
+ int k, kk;
+
+ if ((data + n) > eod)
+ break;
+
+ for (k = 0; k < 4; ++k) {
+ int r = *data++;
+ for (kk = 0; kk < 3; ++kk)
+ *p++ = r;
+ }
+ if (n == 6) {
+ int r, g, b, u, v;
+ u = *(int8_t *)data++;
+ v = *(int8_t *)data++;
+ p -= 12;
+ for(k=0; k<4; ++k) {
+ r = *p++ + v*2;
+ g = *p++ - (u/2) - v;
+ b = *p + u*2;
+ p -= 2;
+ *p++ = av_clip_uint8(r);
+ *p++ = av_clip_uint8(g);
+ *p++ = av_clip_uint8(b);
+ }
+ }
+ } else {
+ p += 12;
+ }
+ }
+}
+
+static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
+ int chunk_id, int size, const uint8_t *data)
+{
+ const uint8_t *eod = (data + size);
+ uint32_t flag, mask;
+ uint8_t *cb0, *cb1, *cb2, *cb3;
+ unsigned int x, y;
+ char *ip0, *ip1, *ip2, *ip3;
+
+ flag = 0;
+ mask = 0;
+
+ for (y=strip->y1; y < strip->y2; y+=4) {
+
+/* take care of y dimension not being multiple of 4, such streams exist */
+ ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
+ (s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
+ if(s->avctx->height - y > 1) {
+ ip1 = ip0 + s->frame->linesize[0];
+ if(s->avctx->height - y > 2) {
+ ip2 = ip1 + s->frame->linesize[0];
+ if(s->avctx->height - y > 3) {
+ ip3 = ip2 + s->frame->linesize[0];
+ }
+ }
+ }
+/* to get the correct picture for not-multiple-of-4 cases let us fill
+ * each block from the bottom up, thus possibly overwriting the top line
+ * more than once but ending with the correct data in place
+ * (instead of in-loop checking) */
+
+ for (x=strip->x1; x < strip->x2; x+=4) {
+ if ((chunk_id & 0x01) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ return AVERROR_INVALIDDATA;
+
+ flag = AV_RB32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if (!(chunk_id & 0x01) || (flag & mask)) {
+ if (!(chunk_id & 0x02) && !(mask >>= 1)) {
+ if ((data + 4) > eod)
+ return AVERROR_INVALIDDATA;
+
+ flag = AV_RB32 (data);
+ data += 4;
+ mask = 0x80000000;
+ }
+
+ if ((chunk_id & 0x02) || (~flag & mask)) {
+ uint8_t *p;
+ if (data >= eod)
+ return AVERROR_INVALIDDATA;
+
+ p = strip->v1_codebook[*data++];
+ if (s->palette_video) {
+ ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
+ ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
+ ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
+ ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
+ } else {
+ p += 6;
+ memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
+ memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
+ p += 3; /* ... + 9 */
+ memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
+ memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
+ p -= 9; /* ... + 0 */
+ memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
+ memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
+ p += 3; /* ... + 3 */
+ memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
+ memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
+ }
+
+ } else if (flag & mask) {
+ if ((data + 4) > eod)
+ return AVERROR_INVALIDDATA;
+
+ cb0 = strip->v4_codebook[*data++];
+ cb1 = strip->v4_codebook[*data++];
+ cb2 = strip->v4_codebook[*data++];
+ cb3 = strip->v4_codebook[*data++];
+ if (s->palette_video) {
+ uint8_t *p;
+ p = ip3;
+ *p++ = cb2[6];
+ *p++ = cb2[9];
+ *p++ = cb3[6];
+ *p = cb3[9];
+ p = ip2;
+ *p++ = cb2[0];
+ *p++ = cb2[3];
+ *p++ = cb3[0];
+ *p = cb3[3];
+ p = ip1;
+ *p++ = cb0[6];
+ *p++ = cb0[9];
+ *p++ = cb1[6];
+ *p = cb1[9];
+ p = ip0;
+ *p++ = cb0[0];
+ *p++ = cb0[3];
+ *p++ = cb1[0];
+ *p = cb1[3];
+ } else {
+ memcpy(ip3 + 0, cb2 + 6, 6);
+ memcpy(ip3 + 6, cb3 + 6, 6);
+ memcpy(ip2 + 0, cb2 + 0, 6);
+ memcpy(ip2 + 6, cb3 + 0, 6);
+ memcpy(ip1 + 0, cb0 + 6, 6);
+ memcpy(ip1 + 6, cb1 + 6, 6);
+ memcpy(ip0 + 0, cb0 + 0, 6);
+ memcpy(ip0 + 6, cb1 + 0, 6);
+ }
+
+ }
+ }
+
+ if (s->palette_video) {
+ ip0 += 4; ip1 += 4;
+ ip2 += 4; ip3 += 4;
+ } else {
+ ip0 += 12; ip1 += 12;
+ ip2 += 12; ip3 += 12;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int cinepak_decode_strip (CinepakContext *s,
+ cvid_strip *strip, const uint8_t *data, int size)
+{
+ const uint8_t *eod = (data + size);
+ int chunk_id, chunk_size;
+
+ /* coordinate sanity checks */
+ if (strip->x2 > s->width ||
+ strip->y2 > s->height ||
+ strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
+ return AVERROR_INVALIDDATA;
+
+ while ((data + 4) <= eod) {
+ chunk_id = data[0];
+ chunk_size = AV_RB24 (&data[1]) - 4;
+ if(chunk_size < 0)
+ return AVERROR_INVALIDDATA;
+
+ data += 4;
+ chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
+
+ switch (chunk_id) {
+
+ case 0x20:
+ case 0x21:
+ case 0x24:
+ case 0x25:
+ cinepak_decode_codebook (strip->v4_codebook, chunk_id,
+ chunk_size, data);
+ break;
+
+ case 0x22:
+ case 0x23:
+ case 0x26:
+ case 0x27:
+ cinepak_decode_codebook (strip->v1_codebook, chunk_id,
+ chunk_size, data);
+ break;
+
+ case 0x30:
+ case 0x31:
+ case 0x32:
+ return cinepak_decode_vectors (s, strip, chunk_id,
+ chunk_size, data);
+ }
+
+ data += chunk_size;
+ }
+
+ return AVERROR_INVALIDDATA;
+}
+
+static int cinepak_decode (CinepakContext *s)
+{
+ const uint8_t *eod = (s->data + s->size);
+ int i, result, strip_size, frame_flags, num_strips;
+ int y0 = 0;
+ int encoded_buf_size;
+
+ if (s->size < 10)
+ return AVERROR_INVALIDDATA;
+
+ frame_flags = s->data[0];
+ num_strips = AV_RB16 (&s->data[8]);
+ encoded_buf_size = AV_RB24(&s->data[1]);
+
+ /* if this is the first frame, check for deviant Sega FILM data */
+ if (s->sega_film_skip_bytes == -1) {
+ if (!encoded_buf_size) {
+ avpriv_request_sample(s->avctx, "encoded_buf_size 0");
+ return AVERROR_PATCHWELCOME;
+ }
+ if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
+ /* If the encoded frame size differs from the frame size as indicated
+ * by the container file, this data likely comes from a Sega FILM/CPK file.
+ * If the frame header is followed by the bytes FE 00 00 06 00 00 then
+ * this is probably one of the two known files that have 6 extra bytes
+ * after the frame header. Else, assume 2 extra bytes. The container
+ * size also cannot be a multiple of the encoded size. */
+ if (s->size >= 16 &&
+ (s->data[10] == 0xFE) &&
+ (s->data[11] == 0x00) &&
+ (s->data[12] == 0x00) &&
+ (s->data[13] == 0x06) &&
+ (s->data[14] == 0x00) &&
+ (s->data[15] == 0x00))
+ s->sega_film_skip_bytes = 6;
+ else
+ s->sega_film_skip_bytes = 2;
+ } else
+ s->sega_film_skip_bytes = 0;
+ }
+
+ s->data += 10 + s->sega_film_skip_bytes;
+
+ num_strips = FFMIN(num_strips, MAX_STRIPS);
+
+ s->frame->key_frame = 0;
+
+ for (i=0; i < num_strips; i++) {
+ if ((s->data + 12) > eod)
+ return AVERROR_INVALIDDATA;
+
+ s->strips[i].id = s->data[0];
+/* zero y1 means "relative to the previous stripe" */
+ if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
+ s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
+ else
+ s->strips[i].y2 = AV_RB16 (&s->data[8]);
+ s->strips[i].x1 = AV_RB16 (&s->data[6]);
+ s->strips[i].x2 = AV_RB16 (&s->data[10]);
+
+ if (s->strips[i].id == 0x10)
+ s->frame->key_frame = 1;
+
+ strip_size = AV_RB24 (&s->data[1]) - 12;
+ if (strip_size < 0)
+ return AVERROR_INVALIDDATA;
+ 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 av_cold int cinepak_decode_init(AVCodecContext *avctx)
+{
+ CinepakContext *s = avctx->priv_data;
+
+ s->avctx = avctx;
+ s->width = (avctx->width + 3) & ~3;
+ s->height = (avctx->height + 3) & ~3;
+
+ s->sega_film_skip_bytes = -1; /* uninitialized state */
+
+ // check for paletted data
+ if (avctx->bits_per_coded_sample != 8) {
+ s->palette_video = 0;
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
+ } else {
+ s->palette_video = 1;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ }
+
+ s->frame = av_frame_alloc();
+ if (!s->frame)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+static int cinepak_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int ret = 0, buf_size = avpkt->size;
+ CinepakContext *s = avctx->priv_data;
+
+ s->data = buf;
+ s->size = buf_size;
+
+ if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
+ return ret;
+
+ if (s->palette_video) {
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+ if (pal) {
+ s->frame->palette_has_changed = 1;
+ memcpy(s->pal, pal, AVPALETTE_SIZE);
+ }
+ }
+
+ if ((ret = cinepak_decode(s)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
+ }
+
+ if (s->palette_video)
+ memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
+
+ if ((ret = av_frame_ref(data, s->frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
+
+ /* report that the buffer was completely consumed */
+ return buf_size;
+}
+
+static av_cold int cinepak_decode_end(AVCodecContext *avctx)
+{
+ CinepakContext *s = avctx->priv_data;
+
+ av_frame_free(&s->frame);
+
+ return 0;
+}
+
+AVCodec ff_cinepak_decoder = {
+ .name = "cinepak",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_CINEPAK,
+ .priv_data_size = sizeof(CinepakContext),
+ .init = cinepak_decode_init,
+ .close = cinepak_decode_end,
+ .decode = cinepak_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
+};
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