NuppelVideo/MythTVVideo support, including rtjpeg decoder

Originally committed as revision 5232 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 214 insertions, 0 deletions

diff --git a/libavcodec/nuv.c b/libavcodec/nuv.c
new file mode 100644
index 0000000000..d315182500
--- /dev/null
+++ b/libavcodec/nuv.c
@@ -0,0 +1,214 @@
+/*
+ * NuppelVideo decoder
+ * Copyright (c) 2006 Reimar Doeffinger
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#include "bswap.h"
+#include "dsputil.h"
+#include "lzo.h"
+#include "rtjpeg.h"
+
+typedef struct {
+    AVFrame pic;
+    int width, height;
+    unsigned int decomp_size;
+    unsigned char* decomp_buf;
+    uint32_t lq[64], cq[64];
+    RTJpegContext rtj;
+    DSPContext dsp;
+} NuvContext;
+
+/**
+ * \brief copy frame data from buffer to AVFrame, handling stride.
+ * \param f destination AVFrame
+ * \param src source buffer, does not use any line-stride
+ * \param width width of the video frame
+ * \param height height of the video frame
+ */
+static void copy_frame(AVFrame *f, uint8_t *src,
+                       int width, int height) {
+    AVPicture pic;
+    avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
+    img_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
+}
+
+/**
+ * \brief extract quantization tables from codec data into our context
+ */
+static int get_quant(AVCodecContext *avctx, NuvContext *c,
+                     uint8_t *buf, int size) {
+    int i;
+    if (size < 2 * 64 * 4) {
+        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
+        return -1;
+    }
+    for (i = 0; i < 64; i++, buf += 4)
+        c->lq[i] = LE_32(buf);
+    for (i = 0; i < 64; i++, buf += 4)
+        c->cq[i] = LE_32(buf);
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        uint8_t *buf, int buf_size) {
+    NuvContext *c = (NuvContext *)avctx->priv_data;
+    AVFrame *picture = data;
+    int orig_size = buf_size;
+    enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
+          NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
+          NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
+
+    if (buf_size < 12) {
+        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
+        return -1;
+    }
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+    c->pic.reference = 1;
+    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
+                          FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if (avctx->get_buffer(avctx, &c->pic) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    // codec data (rtjpeg quant tables)
+    if (buf[0] == 'D' && buf[1] == 'R') {
+        int ret;
+        // skip rest of the frameheader.
+        buf = &buf[12];
+        buf_size -= 12;
+        ret = get_quant(avctx, c, buf, buf_size);
+        if (ret < 0)
+            return ret;
+        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
+        return orig_size;
+    }
+
+    if (buf[0] != 'V' || buf_size < 12) {
+        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
+        return -1;
+    }
+    comptype = buf[1];
+    // skip rest of the frameheader.
+    buf = &buf[12];
+    buf_size -= 12;
+
+    c->pic.pict_type = FF_I_TYPE;
+    c->pic.key_frame = 1;
+    // decompress/copy/whatever data
+    switch (comptype) {
+        case NUV_UNCOMPRESSED: {
+            int height = c->height;
+            if (buf_size < c->width * height * 3 / 2) {
+                av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
+                height = buf_size / c->width / 3 * 2;
+            }
+            copy_frame(&c->pic, buf, c->width, height);
+            break;
+        }
+        case NUV_RTJPEG: {
+            rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
+            break;
+        }
+        case NUV_RTJPEG_IN_LZO: {
+            int outlen = c->decomp_size, inlen = buf_size;
+            if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
+                av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
+            rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
+            break;
+        }
+        case NUV_LZO: {
+            int outlen = c->decomp_size, inlen = buf_size;
+            if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
+                av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
+            copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
+            break;
+        }
+        case NUV_BLACK: {
+            memset(c->pic.data[0], 0, c->width * c->height);
+            memset(c->pic.data[1], 128, c->width * c->height / 4);
+            memset(c->pic.data[2], 128, c->width * c->height / 4);
+            break;
+        }
+        case NUV_COPY_LAST: {
+            c->pic.pict_type = FF_P_TYPE;
+            c->pic.key_frame = 0;
+            /* nothing more to do here */
+            break;
+        }
+        default:
+            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
+            return -1;
+    }
+
+    *picture = c->pic;
+    *data_size = sizeof(AVFrame);
+    return orig_size;
+}
+
+static int decode_init(AVCodecContext *avctx) {
+    NuvContext *c = (NuvContext *)avctx->priv_data;
+    avctx->width = (avctx->width + 1) & ~1;
+    avctx->height = (avctx->height + 1) & ~1;
+    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
+        return 1;
+    }
+    avctx->has_b_frames = 0;
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+    c->pic.data[0] = NULL;
+    c->width = avctx->width;
+    c->height = avctx->height;
+    c->decomp_size = c->height * c->width * 3 / 2;
+    c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
+    if (!c->decomp_buf) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+        return 1;
+    }
+    dsputil_init(&c->dsp, avctx);
+    if (avctx->extradata_size)
+        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
+    rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
+    return 0;
+}
+
+static int decode_end(AVCodecContext *avctx) {
+    NuvContext *c = (NuvContext *)avctx->priv_data;
+    av_freep(&c->decomp_buf);
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+    return 0;
+}
+
+AVCodec nuv_decoder = {
+    "nuv",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_NUV,
+    sizeof(NuvContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+};
+