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first pass at a Sorenson Video 1 (SVQ1) encoder 

Originally committed as revision 3113 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Mike Melanson 21 years ago
parent
d91712990c
commit
3b64893dae
5 changed files with 742 additions and 15 deletions
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  1. +1
    -0
      Changelog
  2. +1
    -1
      doc/ffmpeg-doc.texi
  3. +1
    -0
      libavcodec/allcodecs.c
  4. +1
    -0
      libavcodec/avcodec.h
  5. +738
    -14
      libavcodec/svq1.c

+ 1
- 0
Changelog View File

@@ -14,6 +14,7 @@ version <next>:
- RealVideo 2.0 (RV20) decoder
- Duck TrueMotion v1 (DUCK) video decoder
- Sierra VMD demuxer and video decoder
- SVQ1 video encoder

version 0.4.8:



+ 1
- 1
doc/ffmpeg-doc.texi View File

@@ -719,7 +719,7 @@ following image formats are supported:
@item Asus v2 @tab X @tab X @tab fourcc: ASV2
@item Creative YUV @tab @tab X @tab fourcc: CYUV
@item H.264 @tab @tab X
@item Sorenson Video 1 @tab @tab X @tab fourcc: SVQ1
@item Sorenson Video 1 @tab X @tab X @tab fourcc: SVQ1
@item Sorenson Video 3 @tab @tab X @tab fourcc: SVQ3
@item On2 VP3 @tab @tab X @tab still experimental
@item Theora @tab @tab X @tab still experimental


+ 1
- 0
libavcodec/allcodecs.c View File

@@ -66,6 +66,7 @@ void avcodec_register_all(void)
register_avcodec(&msmpeg4v3_encoder);
register_avcodec(&wmv1_encoder);
register_avcodec(&wmv2_encoder);
register_avcodec(&svq1_encoder);
#endif
register_avcodec(&mjpeg_encoder);
register_avcodec(&ljpeg_encoder);


+ 1
- 0
libavcodec/avcodec.h View File

@@ -1719,6 +1719,7 @@ extern AVCodec vcr1_encoder;
extern AVCodec ffv1_encoder;
extern AVCodec mdec_encoder;
extern AVCodec zlib_encoder;
extern AVCodec svq1_encoder;

extern AVCodec h263_decoder;
extern AVCodec mpeg4_decoder;


+ 738
- 14
libavcodec/svq1.c View File

@@ -17,14 +17,18 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* (SVQ1 Decoder)
* Ported to mplayer by Arpi <arpi@thot.banki.hu>
* Ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>
*
* SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net>
*/

/**
* @file svq1.c
* Sorenson Vector Quantizer #1 (SVQ1) video decoder.
* Sorenson Vector Quantizer #1 (SVQ1) video codec.
* For more information of the SVQ1 algorithm, visit:
* http://www.pcisys.net/~melanson/codecs/
*/


@@ -54,6 +58,29 @@ static VLC svq1_inter_mean;
#define SVQ1_BLOCK_INTER_4V 2
#define SVQ1_BLOCK_INTRA 3

typedef struct SVQ1Context {

AVCodecContext *avctx;
DSPContext dsp;
AVFrame picture;
PutBitContext pb;
GetBitContext gb;

int frame_width;
int frame_height;

/* Y plane block dimensions */
int y_block_width;
int y_block_height;

/* U & V plane (C planes) block dimensions */
int c_block_width;
int c_block_height;

unsigned char *c_plane;

} SVQ1Context;

/* motion vector (prediction) */
typedef struct svq1_pmv_s {
int x;
@@ -243,7 +270,7 @@ static int svq1_decode_block_intra (GetBitContext *bitbuf, uint8_t *pixels, int

if ((stages > 0) && (level >= 4)) {
#ifdef DEBUG_SVQ1
printf("Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",stages,level);
av_log(s->avctx, AV_LOG_INFO, "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",stages,level);
#endif
return -1; /* invalid vector */
}
@@ -293,7 +320,7 @@ static int svq1_decode_block_non_intra (GetBitContext *bitbuf, uint8_t *pixels,

if ((stages > 0) && (level >= 4)) {
#ifdef DEBUG_SVQ1
printf("Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",stages,level);
av_log(s->avctx, AV_LOG_INFO, "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",stages,level);
#endif
return -1; /* invalid vector */
}
@@ -381,7 +408,7 @@ static int svq1_motion_inter_block (MpegEncContext *s, GetBitContext *bitbuf,
int w= (s->width+15)&~15;
int h= (s->height+15)&~15;
if(x + (mv.x >> 1)<0 || y + (mv.y >> 1)<0 || x + (mv.x >> 1) + 16 > w || y + (mv.y >> 1) + 16> h)
printf("%d %d %d %d\n", x, y, x + (mv.x >> 1), y + (mv.y >> 1));
av_log(s->avctx, AV_LOG_INFO, "%d %d %d %d\n", x, y, x + (mv.x >> 1), y + (mv.y >> 1));
#endif
src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1))*pitch];
@@ -464,7 +491,7 @@ static int svq1_motion_inter_4v_block (MpegEncContext *s, GetBitContext *bitbuf,
int w= (s->width+15)&~15;
int h= (s->height+15)&~15;
if(x + (mvx >> 1)<0 || y + (mvy >> 1)<0 || x + (mvx >> 1) + 8 > w || y + (mvy >> 1) + 8> h)
printf("%d %d %d %d\n", x, y, x + (mvx >> 1), y + (mvy >> 1));
av_log(s->avctx, AV_LOG_INFO, "%d %d %d %d\n", x, y, x + (mvx >> 1), y + (mvy >> 1));
#endif
src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1))*pitch];
dst = current;
@@ -512,7 +539,7 @@ static int svq1_decode_delta_block (MpegEncContext *s, GetBitContext *bitbuf,
if (result != 0)
{
#ifdef DEBUG_SVQ1
printf("Error in svq1_motion_inter_block %i\n",result);
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_motion_inter_block %i\n",result);
#endif
break;
}
@@ -525,7 +552,7 @@ static int svq1_decode_delta_block (MpegEncContext *s, GetBitContext *bitbuf,
if (result != 0)
{
#ifdef DEBUG_SVQ1
printf("Error in svq1_motion_inter_4v_block %i\n",result);
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_motion_inter_4v_block %i\n",result);
#endif
break;
}
@@ -604,7 +631,7 @@ static int svq1_decode_frame_header (GetBitContext *bitbuf,MpegEncContext *s) {

csum = svq1_packet_checksum ((uint8_t *)bitbuf->buffer, bitbuf->size_in_bits>>3, csum);

// printf ("%s checksum (%02x) for packet data\n",
// av_log(s->avctx, AV_LOG_INFO, "%s checksum (%02x) for packet data\n",
// (csum == 0) ? "correct" : "incorrect", csum);
}

@@ -692,13 +719,13 @@ static int svq1_decode_frame(AVCodecContext *avctx,
if (result != 0)
{
#ifdef DEBUG_SVQ1
printf("Error in svq1_decode_frame_header %i\n",result);
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_frame_header %i\n",result);
#endif
return result;
}
//FIXME this avoids some confusion for "B frames" without 2 references
//this should be removed after libavcodec can handle more flaxible picture types & ordering
//this should be removed after libavcodec can handle more flexible picture types & ordering
if(s->pict_type==B_TYPE && s->last_picture_ptr==NULL) return buf_size;
if(avctx->hurry_up && s->pict_type==B_TYPE) return buf_size;
@@ -735,9 +762,9 @@ static int svq1_decode_frame(AVCodecContext *avctx,
result = svq1_decode_block_intra (&s->gb, &current[x], linesize);
if (result != 0)
{
#ifdef DEBUG_SVQ1
printf("Error in svq1_decode_block %i (keyframe)\n",result);
#endif
//#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_block %i (keyframe)\n",result);
//#endif
return result;
}
}
@@ -755,7 +782,7 @@ static int svq1_decode_frame(AVCodecContext *avctx,
if (result != 0)
{
#ifdef DEBUG_SVQ1
printf("Error in svq1_decode_delta_block %i\n",result);
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_delta_block %i\n",result);
#endif
return result;
}
@@ -791,6 +818,7 @@ static int svq1_decode_init(AVCodecContext *avctx)
s->codec_id= avctx->codec->id;
avctx->pix_fmt = PIX_FMT_YUV410P;
avctx->has_b_frames= 1; // not true, but DP frames and these behave like unidirectional b frames
s->flags= avctx->flags;
if (MPV_common_init(s) < 0) return -1;

init_vlc(&svq1_block_type, 2, 4,
@@ -829,6 +857,688 @@ static int svq1_decode_end(AVCodecContext *avctx)
return 0;
}

static void svq1_write_header(SVQ1Context *s, int frame_type)
{
/* frame code */
put_bits(&s->pb, 22, 0x20);

/* temporal reference (sure hope this is a "don't care") */
put_bits(&s->pb, 8, 0x00);

/* frame type */
put_bits(&s->pb, 2, frame_type - 1);

if (frame_type == I_TYPE) {

/* no checksum since frame code is 0x20 */

/* no embedded string either */

/* output 5 unknown bits (2 + 2 + 1) */
put_bits(&s->pb, 5, 0);

/* forget about matching up resolutions, just use the free-form
* resolution code (7) for now */
put_bits(&s->pb, 3, 7);
put_bits(&s->pb, 12, s->frame_width);
put_bits(&s->pb, 12, s->frame_height);

}

/* no checksum or extra data (next 2 bits get 0) */
put_bits(&s->pb, 2, 0);
}

int level_sizes[6] = { 8, 16, 32, 64, 128, 256 };
int level_log2_sizes[6] = { 3, 4, 5, 6, 7, 8 };

#define IABS(x) ((x < 0) ? (-(x)) : x)



//#define USE_MAD_ALGORITHM

#ifdef USE_MAD_ALGORITHM

#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6

/* This function calculates vector differences using mean absolute
* difference (MAD). */

static int encode_vector(SVQ1Context *s, unsigned char *vector,
unsigned int level, int threshold)
{
int i, j, k;
int mean;
signed short work_vector[256];
int best_codebook;
int best_score;
int multistage_codebooks[6];
int number_of_stages = 0;
int8_t *current_codebook;
int total_deviation;
int ret;

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " ** recursive entry point: encoding level %d vector at threshold %d\n",
level, threshold);
#endif
if (level > 5) {
av_log(s->avctx, AV_LOG_INFO, " help! level %d > 5\n", level);
return 0;
}

#ifdef DEBUG_SVQ1
for (i = 0; i < level_sizes[level]; i++)
av_log(s->avctx, AV_LOG_INFO, " %02X", vector[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

/* calculate the mean */
mean = 0;
for (i = 0; i < level_sizes[level]; i++)
mean += vector[i];
mean >>= level_log2_sizes[level];

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " vector mean = 0x%02X\n", mean);
#endif

/* remove the mean from the vector */
total_deviation = 0;
for (i = 0; i < level_sizes[level]; i++) {
work_vector[i] = (signed short)vector[i] - mean;
total_deviation += IABS(work_vector[i]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " %d", work_vector[i]);
#endif
}

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n total deviation = %d\n", total_deviation);
#endif

if (total_deviation < threshold) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only encoding found for level %d vector, mean = %d\n",
level, mean);
#endif

/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);

/* index 1 in the table indicates mean-only encoding */
put_bits(&s->pb, svq1_intra_multistage_vlc[level][1][1],
svq1_intra_multistage_vlc[level][1][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only L%d, VLC = (0x%X, %d), mean = %d (0x%X, %d)\n",
level,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif

ret = 0;

} else {

if (level <= 3) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " multistage VQ search...\n");
#endif
/* conduct multistage VQ search, for each stage... */
for (i = 0; i < 6; i++) {

best_codebook = 0;
best_score = 0x7FFFFFFF;
/* for each codebook in stage */
for (j = 0; j < 16; j++) {

total_deviation = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
/* calculate the total deviation for the vector */
for (k = 0; k < level_sizes[level]; k++) {
total_deviation +=
IABS(work_vector[k] - current_codebook[k]);
}

/* lowest score so far? */
if (total_deviation < best_score) {
best_score = total_deviation;
best_codebook = j;
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " after %d, %d, best codebook is %d with a score of %d (score was %d)\n",
i, j, best_codebook, best_score, total_deviation);
#endif
}

/* apply the winning codebook to the work vector and check if
* the vector meets the quality threshold */
total_deviation = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
multistage_codebooks[number_of_stages++] = best_codebook;
for (j = 0; j < level_sizes[level]; j++) {
work_vector[j] = work_vector[j] - current_codebook[j];
total_deviation += IABS(work_vector[j]);
}

/* do not go forward with the rest of the search if an acceptable
* codebook combination has been found */
if (total_deviation < threshold)
break;
}
}

if ((total_deviation < threshold) || (level == 0)) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " level %d VQ encoding found using mean %d and codebooks", level, mean);
for (i = 0; i < number_of_stages; i++)
av_log(s->avctx, AV_LOG_INFO, " %d", multistage_codebooks[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);

/* output the encoding */
put_bits(&s->pb,
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
svq1_intra_multistage_vlc[level][1 + number_of_stages][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " L%d: multistage = %d (0x%X, %d), mean = %d (0x%X, %d), codebooks = ",
level,
number_of_stages,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif

for (i = 0; i < number_of_stages; i++)
{
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "%d ", multistage_codebooks[i]);
#endif
put_bits(&s->pb, 4, multistage_codebooks[i]);
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

ret = 0;

} else {

/* output a subdivision bit to the encoded stream and signal to
* the calling function that this vector could not be
* coded at the requested threshold and needs to be subdivided */
put_bits(&s->pb, 1, 1);
ret = 1;
}
}

return ret;
}

#else

#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6

/* This function calculates vector differences using mean square
* error (MSE). */

static int encode_vector(SVQ1Context *s, unsigned char *vector,
unsigned int level, int threshold)
{
int i, j, k;
int mean;
signed short work_vector[256];
int best_codebook;
int best_score;
int multistage_codebooks[6];
int number_of_stages = 0;
int8_t *current_codebook;
int mse;
int diff;
int ret;

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " ** recursive entry point: encoding level %d vector at threshold %d\n",
level, threshold);
#endif
if (level > 5) {
av_log(s->avctx, AV_LOG_INFO, " help! level %d > 5\n", level);
return 0;
}

#ifdef DEBUG_SVQ1
for (i = 0; i < level_sizes[level]; i++)
av_log(s->avctx, AV_LOG_INFO, " %02X", vector[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

/* calculate the mean */
mean = 0;
for (i = 0; i < level_sizes[level]; i++)
mean += vector[i];
mean >>= level_log2_sizes[level];

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " vector mean = 0x%02X\n", mean);
#endif

/* remove the mean from the vector and compute the resulting MSE */
mse = 0;
for (i = 0; i < level_sizes[level]; i++) {
work_vector[i] = (signed short)vector[i] - mean;
mse += (work_vector[i] * work_vector[i]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " %d", work_vector[i]);
#endif
}
mse >>= level_log2_sizes[level];

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n MSE = %d\n", mse);
#endif

if (mse < threshold) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only encoding found for level %d vector, mean = %d\n",
level, mean);
#endif

/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);

/* index 1 in the table indicates mean-only encoding */
put_bits(&s->pb, svq1_intra_multistage_vlc[level][1][1],
svq1_intra_multistage_vlc[level][1][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only L%d, VLC = (0x%X, %d), mean = %d (0x%X, %d)\n",
level,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif

ret = 0;

} else {

if (level <= 3) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " multistage VQ search...\n");
#endif
/* conduct multistage VQ search, for each stage... */
for (i = 0; i < 6; i++) {

best_codebook = 0;
best_score = 0x7FFFFFFF;
/* for each codebook in stage */
for (j = 0; j < 16; j++) {

mse = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
/* calculate the MSE for this vector */
for (k = 0; k < level_sizes[level]; k++) {
diff = work_vector[k] - current_codebook[k];
mse += (diff * diff);
}
mse >>= level_log2_sizes[level];

/* lowest score so far? */
if (mse < best_score) {
best_score = mse;
best_codebook = j;
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " after %d, %d, best codebook is %d with a score of %d (score was %d)\n",
i, j, best_codebook, best_score, mse);
#endif
}

/* apply the winning codebook to the work vector and check if
* the vector meets the quality threshold */
mse = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
multistage_codebooks[number_of_stages++] = best_codebook;
for (j = 0; j < level_sizes[level]; j++) {
work_vector[j] = work_vector[j] - current_codebook[j];
mse += (work_vector[j] * work_vector[j]);
}
mse >>= level_log2_sizes[level];

/* do not go forward with the rest of the search if an acceptable
* codebook combination has been found */
if (mse < threshold)
break;
}
}

if ((mse < threshold) || (level == 0)) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " level %d VQ encoding found using mean %d and codebooks", level, mean);
for (i = 0; i < number_of_stages; i++)
av_log(s->avctx, AV_LOG_INFO, " %d", multistage_codebooks[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);

/* output the encoding */
put_bits(&s->pb,
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
svq1_intra_multistage_vlc[level][1 + number_of_stages][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " L%d: multistage = %d (0x%X, %d), mean = %d (0x%X, %d), codebooks = ",
level,
number_of_stages,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif

for (i = 0; i < number_of_stages; i++)
{
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "%d ", multistage_codebooks[i]);
#endif
put_bits(&s->pb, 4, multistage_codebooks[i]);
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif

ret = 0;

} else {

/* output a subdivision bit to the encoded stream and signal to
* the calling function that this vector could not be
* coded at the requested threshold and needs to be subdivided */
put_bits(&s->pb, 1, 1);
ret = 1;
}
}

return ret;
}
#endif

static void svq1_encode_plane(SVQ1Context *s, unsigned char *plane,
int width, int height, int stride)
{
unsigned char buffer0[256];
unsigned char buffer1[256];
int current_buffer;
unsigned char *vector;
unsigned char *subvectors;
int vector_count;
int subvector_count;
int x, y;
int i, j;
int block_width, block_height;
int left_edge;
int level;
int threshold[6];

static int frame = 0;

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "********* frame #%d\n", frame++);
#endif

/* figure out the acceptable level thresholds in advance */
threshold[5] = QUALITY_THRESHOLD;
for (level = 4; level >= 0; level--)
threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;

block_width = (width + 15) / 16;
block_height = (height + 15) / 16;

for (y = 0; y < block_height; y++) {

for (x = 0; x < block_width; x++) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "* level 5 vector @ %d, %d:\n", x * 16, y * 16);
#endif

/* copy the block into the current work buffer */
left_edge = (y * 16 * stride) + (x * 16);
for (i = 0; i < 256; i += 16) {
memcpy(&buffer0[i], &plane[left_edge], 16);
left_edge += stride;
}
current_buffer = 1; /* this will toggle to 0 immediately */

/* perform a breadth-first tree encoding for each vector level */
subvector_count = 1; /* one subvector at level 5 */
for (level = 5; level >= 0; level--) {

vector_count = subvector_count;
subvector_count = 0;

if (current_buffer == 0) {
current_buffer = 1;
vector = buffer1;
subvectors = buffer0;
} else {
current_buffer = 0;
vector = buffer0;
subvectors = buffer1;
}

/* iterate through each vector in the list */
for (i = 0; i < vector_count; i++) {

if (encode_vector(s, vector, level, threshold[level])) {

#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " split to level %d\n", level - 1);
#endif
/* subdivide into 2 subvectors for later processing */
subvector_count += 2;

if (level - 1 == 3) {
/* subdivide 16x8 -> 2 8x8 */
for (j = 0; j < 8; j++) {
/* left half */
memcpy(subvectors + j * 8, vector + j * 16, 8);
/* right half */
memcpy(subvectors + 64 + j * 8,
vector + 8 + j * 16, 8);
}
subvectors += 128;
} else if (level - 1 == 1) {
/* subdivide 8x4 -> 2 4x4 */
for (j = 0; j < 4; j++) {
/* left half */
memcpy(subvectors + j * 4, vector + j * 8, 4);
/* right half */
memcpy(subvectors + 16 + j * 4,
vector + 4 + j * 8, 4);
}
subvectors += 32;
} else {
/* first half */
memcpy(subvectors, vector, level_sizes[level - 1]);
subvectors += level_sizes[level - 1];
/* second half */
memcpy(subvectors, vector + level_sizes[level - 1],
level_sizes[level - 1]);
subvectors += level_sizes[level - 1];
}
}
vector += level_sizes[level];
}

/* if there are no more subvectors, break early */
if (!subvector_count)
break;
}
}
}
}

/* output a plane with a constant mean value; good for debugging and for
* greyscale encoding but only valid for intra frames */
static void svq1_output_intra_constant_mean(SVQ1Context *s, int block_width,
int block_height, unsigned char mean)
{
int i;

/* for each level 5 vector, output the specified mean value */
for (i = 0; i < block_width * block_height; i++) {

/* output a 0 before each vector indicating no subdivision */
put_bits(&s->pb, 1, 0);

/* output a 0 indicating mean-only encoding; use index 1 as that
* maps to code 0 */
put_bits(&s->pb, svq1_intra_multistage_vlc[5][1][1],
svq1_intra_multistage_vlc[5][1][0]);

/* output a constant mean */
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " const L5 %d/%d: multistage = 0 (0x%X, %d), mean = %d (0x%X, %d)\n",
i, block_width * block_height,
svq1_intra_multistage_vlc[5][1][0],
svq1_intra_multistage_vlc[5][1][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
}
}

static int svq1_encode_init(AVCodecContext *avctx)
{
SVQ1Context * const s = avctx->priv_data;
int i;
unsigned char least_bits_value = 0;
int least_bits;

dsputil_init(&s->dsp, avctx);
avctx->coded_frame= (AVFrame*)&s->picture;

s->frame_width = avctx->width;
s->frame_height = avctx->height;

s->y_block_width = (s->frame_width + 15) / 16;
s->y_block_height = (s->frame_height + 15) / 16;

s->c_block_width = (s->frame_width / 4 + 15) / 16;
s->c_block_height = (s->frame_height / 4 + 15) / 16;

av_log(s->avctx, AV_LOG_INFO, " Hey: %d x %d, %d x %d, %d x %d\n",
s->frame_width, s->frame_height,
s->y_block_width, s->y_block_height,
s->c_block_width, s->c_block_height);

/* allocate a plane for the U & V planes (color, or C, planes) and
* initialize them to the value that is represented by the fewest bits
* in the mean table; the reasoning behind this is that when the border
* vectors are operated upon and possibly subdivided, the mean will be
* removed resulting in a perfect deviation score of 0 and encoded with
* the minimal possible bits */
s->c_plane = av_malloc(s->c_block_width * s->c_block_height * 16 * 16);
least_bits = 10000;
for (i = 0; i < 256; i++)
if (svq1_intra_mean_vlc[i][1] < least_bits) {
least_bits = svq1_intra_mean_vlc[i][1];
least_bits_value = i;
}
memset(s->c_plane, least_bits_value,
s->c_block_width * s->c_block_height * 16 * 16);

return 0;
}

static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
int buf_size, void *data)
{
SVQ1Context * const s = avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p= (AVFrame*)&s->picture;

init_put_bits(&s->pb, buf, buf_size);

*p = *pict;
p->pict_type = I_TYPE;
p->key_frame = 1;

svq1_write_header(s, p->pict_type);
svq1_encode_plane(s, s->picture.data[0], s->frame_width, s->frame_height,
s->picture.linesize[0]);
// if (avctx->flags & CODEC_FLAG_GRAY) {
if (1) {
svq1_output_intra_constant_mean(s, s->c_block_width * 2,
s->c_block_height * 2, 128);
} else {
svq1_encode_plane(s, s->picture.data[1], s->frame_width / 4,
s->frame_height / 4, s->picture.linesize[1]);
svq1_encode_plane(s, s->picture.data[2], s->frame_width / 4,
s->frame_height / 4, s->picture.linesize[2]);
}

// align_put_bits(&s->pb);
while(put_bits_count(&s->pb) & 31)
put_bits(&s->pb, 1, 0);

return (put_bits_count(&s->pb) / 8);
}

static int svq1_encode_end(AVCodecContext *avctx)
{
SVQ1Context * const s = avctx->priv_data;

av_free(s->c_plane);

return 0;
}

AVCodec svq1_decoder = {
"svq1",
CODEC_TYPE_VIDEO,
@@ -841,3 +1551,17 @@ AVCodec svq1_decoder = {
CODEC_CAP_DR1,
.flush= ff_mpeg_flush,
};

#ifdef CONFIG_ENCODERS

AVCodec svq1_encoder = {
"svq1",
CODEC_TYPE_VIDEO,
CODEC_ID_SVQ1,
sizeof(SVQ1Context),
svq1_encode_init,
svq1_encode_frame,
svq1_encode_end,
};

#endif //CONFIG_ENCODERS

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