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Diffstat (limited to 'ffmpeg/libavcodec/eacmv.c')
-rw-r--r--ffmpeg/libavcodec/eacmv.c242
1 files changed, 0 insertions, 242 deletions
diff --git a/ffmpeg/libavcodec/eacmv.c b/ffmpeg/libavcodec/eacmv.c
deleted file mode 100644
index b3ffb3f..0000000
--- a/ffmpeg/libavcodec/eacmv.c
+++ /dev/null
@@ -1,242 +0,0 @@
-/*
- * Electronic Arts CMV Video Decoder
- * Copyright (c) 2007-2008 Peter Ross
- *
- * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * Electronic Arts CMV Video Decoder
- * by Peter Ross (pross@xvid.org)
- *
- * Technical details here:
- * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
- */
-
-#include "libavutil/common.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/imgutils.h"
-#include "avcodec.h"
-#include "internal.h"
-
-typedef struct CmvContext {
- AVCodecContext *avctx;
- AVFrame *last_frame; ///< last
- AVFrame *last2_frame; ///< second-last
- int width, height;
- unsigned int palette[AVPALETTE_COUNT];
-} CmvContext;
-
-static av_cold int cmv_decode_init(AVCodecContext *avctx){
- CmvContext *s = avctx->priv_data;
-
- s->avctx = avctx;
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
- s->last_frame = av_frame_alloc();
- s->last2_frame = av_frame_alloc();
- if (!s->last_frame || !s->last2_frame) {
- av_frame_free(&s->last_frame);
- av_frame_free(&s->last2_frame);
- return AVERROR(ENOMEM);
- }
-
- return 0;
-}
-
-static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
- const uint8_t *buf, const uint8_t *buf_end)
-{
- unsigned char *dst = frame->data[0];
- int i;
-
- for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
- memcpy(dst, buf, s->avctx->width);
- dst += frame->linesize[0];
- buf += s->avctx->width;
- }
-}
-
-static void cmv_motcomp(unsigned char *dst, int dst_stride,
- const unsigned char *src, int src_stride,
- int x, int y,
- int xoffset, int yoffset,
- int width, int height){
- int i,j;
-
- for(j=y;j<y+4;j++)
- for(i=x;i<x+4;i++)
- {
- if (i+xoffset>=0 && i+xoffset<width &&
- j+yoffset>=0 && j+yoffset<height) {
- dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
- }else{
- dst[j*dst_stride + i] = 0;
- }
- }
-}
-
-static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
- const uint8_t *buf_end)
-{
- const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
- int x,y,i;
-
- i = 0;
- for(y=0; y<s->avctx->height/4; y++)
- for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
- if (buf[i]==0xFF) {
- unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
- if (raw+16<buf_end && *raw==0xFF) { /* intra */
- raw++;
- memcpy(dst, raw, 4);
- memcpy(dst + frame->linesize[0], raw+4, 4);
- memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
- memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
- raw+=16;
- }else if(raw<buf_end) { /* inter using second-last frame as reference */
- int xoffset = (*raw & 0xF) - 7;
- int yoffset = ((*raw >> 4)) - 7;
- if (s->last2_frame->data[0])
- cmv_motcomp(frame->data[0], frame->linesize[0],
- s->last2_frame->data[0], s->last2_frame->linesize[0],
- x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
- raw++;
- }
- }else{ /* inter using last frame as reference */
- int xoffset = (buf[i] & 0xF) - 7;
- int yoffset = ((buf[i] >> 4)) - 7;
- if (s->last_frame->data[0])
- cmv_motcomp(frame->data[0], frame->linesize[0],
- s->last_frame->data[0], s->last_frame->linesize[0],
- x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
- }
- i++;
- }
-}
-
-static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
-{
- int pal_start, pal_count, i, ret;
-
- if(buf_end - buf < 16) {
- av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
- return AVERROR_INVALIDDATA;
- }
-
- s->width = AV_RL16(&buf[4]);
- s->height = AV_RL16(&buf[6]);
- if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
- av_frame_unref(s->last_frame);
- av_frame_unref(s->last2_frame);
- ret = ff_set_dimensions(s->avctx, s->width, s->height);
- if (ret < 0)
- return ret;
- }
-
- s->avctx->time_base.num = 1;
- s->avctx->time_base.den = AV_RL16(&buf[10]);
-
- pal_start = AV_RL16(&buf[12]);
- pal_count = AV_RL16(&buf[14]);
-
- buf += 16;
- for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
- s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
- buf += 3;
- }
-
- return 0;
-}
-
-#define EA_PREAMBLE_SIZE 8
-#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
-
-static int cmv_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- CmvContext *s = avctx->priv_data;
- const uint8_t *buf_end = buf + buf_size;
- AVFrame *frame = data;
- int ret;
-
- if (buf_end - buf < EA_PREAMBLE_SIZE)
- return AVERROR_INVALIDDATA;
-
- if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
- unsigned size = AV_RL32(buf + 4);
- ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
- if (ret < 0)
- return ret;
- if (size > buf_end - buf - EA_PREAMBLE_SIZE)
- return -1;
- buf += size;
- }
-
- if (av_image_check_size(s->width, s->height, 0, s->avctx))
- return -1;
-
- if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
- return ret;
-
- memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
-
- buf += EA_PREAMBLE_SIZE;
- if ((buf[0]&1)) { // subtype
- cmv_decode_inter(s, frame, buf+2, buf_end);
- frame->key_frame = 0;
- frame->pict_type = AV_PICTURE_TYPE_P;
- }else{
- frame->key_frame = 1;
- frame->pict_type = AV_PICTURE_TYPE_I;
- cmv_decode_intra(s, frame, buf+2, buf_end);
- }
-
- av_frame_unref(s->last2_frame);
- av_frame_move_ref(s->last2_frame, s->last_frame);
- if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
- return ret;
-
- *got_frame = 1;
-
- return buf_size;
-}
-
-static av_cold int cmv_decode_end(AVCodecContext *avctx){
- CmvContext *s = avctx->priv_data;
-
- av_frame_free(&s->last_frame);
- av_frame_free(&s->last2_frame);
-
- return 0;
-}
-
-AVCodec ff_eacmv_decoder = {
- .name = "eacmv",
- .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_CMV,
- .priv_data_size = sizeof(CmvContext),
- .init = cmv_decode_init,
- .close = cmv_decode_end,
- .decode = cmv_decode_frame,
- .capabilities = CODEC_CAP_DR1,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 23:43:43 +0000