ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/zerocodec.c

@@ -0,0 +1,152 @@
+/*
+ * ZeroCodec Decoder
+ *
+ * Copyright (c) 2012, Derek Buitenhuis
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <zlib.h>
+
+#include "avcodec.h"
+#include "internal.h"
+#include "libavutil/common.h"
+
+typedef struct ZeroCodecContext {
+    AVFrame  *previous_frame;
+    z_stream zstream;
+} ZeroCodecContext;
+
+static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
+                                  int *got_frame, AVPacket *avpkt)
+{
+    ZeroCodecContext *zc = avctx->priv_data;
+    AVFrame *pic         = data;
+    AVFrame *prev_pic    = zc->previous_frame;
+    z_stream *zstream    = &zc->zstream;
+    uint8_t *prev        = prev_pic->data[0];
+    uint8_t *dst;
+    int i, j, zret, ret;
+
+    if (avpkt->flags & AV_PKT_FLAG_KEY) {
+        pic->key_frame = 1;
+        pic->pict_type = AV_PICTURE_TYPE_I;
+    } else {
+        if (!prev) {
+            av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        prev += (avctx->height - 1) * prev_pic->linesize[0];
+
+        pic->key_frame = 0;
+        pic->pict_type = AV_PICTURE_TYPE_P;
+    }
+
+    zret = inflateReset(zstream);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    zstream->next_in  = avpkt->data;
+    zstream->avail_in = avpkt->size;
+
+    dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
+
+    /**
+     * ZeroCodec has very simple interframe compression. If a value
+     * is the same as the previous frame, set it to 0.
+     */
+
+    for (i = 0; i < avctx->height; i++) {
+        zstream->next_out  = dst;
+        zstream->avail_out = avctx->width << 1;
+
+        zret = inflate(zstream, Z_SYNC_FLUSH);
+        if (zret != Z_OK && zret != Z_STREAM_END) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Inflate failed with return code: %d.\n", zret);
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (!(avpkt->flags & AV_PKT_FLAG_KEY))
+            for (j = 0; j < avctx->width << 1; j++)
+                dst[j] += prev[j] & -!dst[j];
+
+        prev -= prev_pic->linesize[0];
+        dst  -= pic->linesize[0];
+    }
+
+    av_frame_unref(zc->previous_frame);
+    if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
+{
+    ZeroCodecContext *zc = avctx->priv_data;
+
+    av_frame_free(&zc->previous_frame);
+
+    inflateEnd(&zc->zstream);
+
+    return 0;
+}
+
+static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
+{
+    ZeroCodecContext *zc = avctx->priv_data;
+    z_stream *zstream    = &zc->zstream;
+    int zret;
+
+    avctx->pix_fmt             = AV_PIX_FMT_UYVY422;
+    avctx->bits_per_raw_sample = 8;
+
+    zstream->zalloc = Z_NULL;
+    zstream->zfree  = Z_NULL;
+    zstream->opaque = Z_NULL;
+
+    zret = inflateInit(zstream);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
+        return AVERROR(ENOMEM);
+    }
+
+    zc->previous_frame = av_frame_alloc();
+    if (!zc->previous_frame) {
+        zerocodec_decode_close(avctx);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+AVCodec ff_zerocodec_decoder = {
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .name           = "zerocodec",
+    .long_name      = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
+    .id             = AV_CODEC_ID_ZEROCODEC,
+    .priv_data_size = sizeof(ZeroCodecContext),
+    .init           = zerocodec_decode_init,
+    .decode         = zerocodec_decode_frame,
+    .close          = zerocodec_decode_close,
+    .capabilities   = AV_CODEC_CAP_DR1,
+};