[SCM] libav/experimental: theora decoding using libtheora

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit aac064b5bdf4fa8d9061086485981624c6ffd75a
Author: Måns Rullgård <mans at mansr.com>
Date:   Wed May 11 16:42:15 2005 +0000

    theora decoding using libtheora
    
    Originally committed as revision 4218 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 9cddeb6..b439bbd 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -61,7 +61,7 @@ void avcodec_register_all(void)
 #endif
 #ifdef CONFIG_LIBTHEORA
 #ifdef CONFIG_OGGTHEORA_ENCODER
-    register_avcodec(&oggtheora_encoder);
+//    register_avcodec(&oggtheora_encoder);
 #endif //CONFIG_OGGTHEORA_ENCODER
 #ifdef CONFIG_OGGTHEORA_DECODER
     register_avcodec(&oggtheora_decoder);
@@ -358,7 +358,7 @@ void avcodec_register_all(void)
 #ifdef CONFIG_VP3_DECODER
     register_avcodec(&vp3_decoder);
 #endif //CONFIG_VP3_DECODER
-#ifdef CONFIG_THEORA_DECODER
+#if (defined CONFIG_THEORA_DECODER && !defined CONFIG_LIBTHEORA)
     register_avcodec(&theora_decoder);
 #endif //CONFIG_THEORA_DECODER
 #ifdef CONFIG_ASV1_DECODER
diff --git a/libavcodec/oggtheora.c b/libavcodec/oggtheora.c
new file mode 100644
index 0000000..6c6e28f
--- /dev/null
+++ b/libavcodec/oggtheora.c
@@ -0,0 +1,133 @@
+/**
+    Copyright (C) 2005  Måns Rullgård
+
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+**/
+
+#include <stdlib.h>
+#include <theora/theora.h>
+#include "avcodec.h"
+
+typedef struct TheoraContext {
+    theora_info info;
+    theora_state state;
+    theora_comment comment;
+    ogg_packet op;
+} TheoraContext;
+
+static int
+Theora_decode_frame(AVCodecContext *ctx, void *outdata, int *outdata_size,
+                    uint8_t *buf, int buf_size)
+{
+    TheoraContext *thc = ctx->priv_data;
+    AVFrame *frame = outdata;
+    yuv_buffer yuv;
+
+    thc->op.packet = buf;
+    thc->op.bytes = buf_size;
+
+    if(theora_decode_packetin(&thc->state, &thc->op))
+	return -1;
+
+    theora_decode_YUVout(&thc->state, &yuv);
+
+    frame->data[0] = yuv.y;
+    frame->data[1] = yuv.u;
+    frame->data[2] = yuv.v;
+    frame->linesize[0] = yuv.y_stride;
+    frame->linesize[1] = yuv.uv_stride;
+    frame->linesize[2] = yuv.uv_stride;
+
+    *outdata_size = sizeof(*frame);
+    return buf_size;
+}
+
+static int
+Theora_decode_end(AVCodecContext *ctx)
+{
+    TheoraContext *thc = ctx->priv_data;
+    theora_info_clear(&thc->info);
+    theora_comment_clear(&thc->comment);
+    return 0;
+}
+
+static int
+Theora_decode_init(AVCodecContext *ctx)
+{
+    TheoraContext *thc = ctx->priv_data;
+    int size, hs, i;
+    ogg_packet op;
+    uint8_t *cdp;
+
+    if(ctx->extradata_size < 6)
+	return -1;
+
+    theora_info_init(&thc->info);
+
+    memset(&op, 0, sizeof(op));
+    cdp = ctx->extradata;
+    size = ctx->extradata_size;
+
+    for(i = 0; i < 3; i++){
+	hs = *cdp++ << 8;
+	hs += *cdp++;
+	size -= 2;
+
+	if(hs > size){
+	    av_log(ctx, AV_LOG_ERROR, "extradata too small: %i > %i\n",
+                   hs, size);
+	    return -1;
+	}
+
+	op.packet = cdp;
+	op.bytes = hs;
+	op.b_o_s = !i;
+	if(theora_decode_header(&thc->info, &thc->comment, &op))
+	    return -1;
+	op.packetno++;
+
+	cdp += hs;
+	size -= hs;
+    }
+
+    theora_decode_init(&thc->state, &thc->info);
+
+    ctx->width = thc->info.width;
+    ctx->height = thc->info.height;
+    ctx->time_base.num = thc->info.fps_denominator;
+    ctx->time_base.den = thc->info.fps_numerator;
+    ctx->pix_fmt = PIX_FMT_YUV420P; /* FIXME: others are possible */
+
+    return 0;
+}
+
+AVCodec oggtheora_decoder = {
+    "theora",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_THEORA,
+    sizeof(TheoraContext),
+    Theora_decode_init,
+    NULL,
+    Theora_decode_end,
+    Theora_decode_frame,
+    0,
+    NULL
+};
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index 659d691..9f9d3ad 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -2973,6 +2973,7 @@ AVCodec vp3_decoder = {
     NULL
 };
 
+#ifndef CONFIG_LIBTHEORA
 AVCodec theora_decoder = {
     "theora",
     CODEC_TYPE_VIDEO,
@@ -2985,3 +2986,4 @@ AVCodec theora_decoder = {
     0,
     NULL
 };
+#endif

-- 
Libav/FFmpeg packaging