-
-static uint16_t svq1_packet_checksum (uint8_t *data, int length, int value) {
- int i;
-
- for (i=0; i < length; i++) {
- value = checksum_table[data[i] ^ (value >> 8)] ^ ((value & 0xFF) << 8);
- }
-
- return value;
-}
-
-static uint16_t svq1_component_checksum (uint16_t *pixels, int pitch,
- int width, int height, int value) {
- int x, y;
-
- for (y=0; y < height; y++) {
- for (x=0; x < width; x++) {
- value = checksum_table[pixels[x] ^ (value >> 8)] ^ ((value & 0xFF) << 8);
- }
-
- pixels += pitch;
- }
-
- return value;
-}
-
-static void svq1_parse_string (GetBitContext *bitbuf, uint8_t *out) {
- uint8_t seed;
- int i;
-
- out[0] = get_bits (bitbuf, 8);
-
- seed = string_table[out[0]];
-
- for (i=1; i <= out[0]; i++) {
- out[i] = get_bits (bitbuf, 8) ^ seed;
- seed = string_table[out[i] ^ seed];
- }
-}
-
-static int svq1_decode_frame_header (GetBitContext *bitbuf,MpegEncContext *s) {
- int frame_size_code;
- int temporal_reference;
-
- temporal_reference = get_bits (bitbuf, 8);
-
- /* frame type */
- s->pict_type= get_bits (bitbuf, 2)+1;
- if(s->pict_type==4)
- return -1;
-
- if (s->pict_type == I_TYPE) {
-
- /* unknown fields */
- if (s->f_code == 0x50 || s->f_code == 0x60) {
- int csum = get_bits (bitbuf, 16);
-
- csum = svq1_packet_checksum ((uint8_t *)bitbuf->buffer, bitbuf->size_in_bits>>3, csum);
-
-// av_log(s->avctx, AV_LOG_INFO, "%s checksum (%02x) for packet data\n",
-// (csum == 0) ? "correct" : "incorrect", csum);
- }
-
- if ((s->f_code ^ 0x10) >= 0x50) {
- char msg[256];
-
- svq1_parse_string (bitbuf, (char *) msg);
-
- av_log(s->avctx, AV_LOG_INFO, "embedded message: \"%s\"\n", (char *) msg);
- }
-
- skip_bits (bitbuf, 2);
- skip_bits (bitbuf, 2);
- skip_bits1 (bitbuf);
-
- /* load frame size */
- frame_size_code = get_bits (bitbuf, 3);
-
- if (frame_size_code == 7) {
- /* load width, height (12 bits each) */
- s->width = get_bits (bitbuf, 12);
- s->height = get_bits (bitbuf, 12);
-
- if (!s->width || !s->height)
- return -1;
- } else {
- /* get width, height from table */
- s->width = svq1_frame_size_table[frame_size_code].width;
- s->height = svq1_frame_size_table[frame_size_code].height;
- }
- }
-
- /* unknown fields */
- if (get_bits (bitbuf, 1) == 1) {
- skip_bits1 (bitbuf); /* use packet checksum if (1) */
- skip_bits1 (bitbuf); /* component checksums after image data if (1) */
-
- if (get_bits (bitbuf, 2) != 0)
- return -1;
- }
-
- if (get_bits (bitbuf, 1) == 1) {
- skip_bits1 (bitbuf);
- skip_bits (bitbuf, 4);
- skip_bits1 (bitbuf);
- skip_bits (bitbuf, 2);
-
- while (get_bits (bitbuf, 1) == 1) {
- skip_bits (bitbuf, 8);
- }
- }
-
- return 0;
-}
-
-static int svq1_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- MpegEncContext *s=avctx->priv_data;
- uint8_t *current, *previous;
- int result, i, x, y, width, height;
- AVFrame *pict = data;
-
- /* initialize bit buffer */
- init_get_bits(&s->gb,buf,buf_size*8);
-
- /* decode frame header */
- s->f_code = get_bits (&s->gb, 22);
-
- if ((s->f_code & ~0x70) || !(s->f_code & 0x60))
- return -1;
-
- /* swap some header bytes (why?) */
- if (s->f_code != 0x20) {
- uint32_t *src = (uint32_t *) (buf + 4);
-
- for (i=0; i < 4; i++) {
- src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
- }
- }
-
- result = svq1_decode_frame_header (&s->gb, s);
-
- if (result != 0)
- {
-#ifdef DEBUG_SVQ1
- 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 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;
-
- if(MPV_frame_start(s, avctx) < 0)
- return -1;
-
- /* decode y, u and v components */
- for (i=0; i < 3; i++) {
- int linesize;
- if (i == 0) {
- width = (s->width+15)&~15;
- height = (s->height+15)&~15;
- linesize= s->linesize;
- } else {
- if(s->flags&CODEC_FLAG_GRAY) break;
- width = (s->width/4+15)&~15;
- height = (s->height/4+15)&~15;
- linesize= s->uvlinesize;
- }
-
- current = s->current_picture.data[i];
-
- if(s->pict_type==B_TYPE){
- previous = s->next_picture.data[i];
- }else{
- previous = s->last_picture.data[i];
- }
-
- if (s->pict_type == I_TYPE) {
- /* keyframe */
- for (y=0; y < height; y+=16) {
- for (x=0; x < width; x+=16) {
- result = svq1_decode_block_intra (&s->gb, ¤t[x], linesize);
- if (result != 0)
- {
-//#ifdef DEBUG_SVQ1
- av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_block %i (keyframe)\n",result);
-//#endif
- return result;
- }
- }
- current += 16*linesize;
- }
- } else {
- svq1_pmv_t pmv[width/8+3];
- /* delta frame */
- memset (pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv_t));
-
- for (y=0; y < height; y+=16) {
- for (x=0; x < width; x+=16) {
- result = svq1_decode_delta_block (s, &s->gb, ¤t[x], previous,
- linesize, pmv, x, y);
- if (result != 0)
- {
-#ifdef DEBUG_SVQ1
- av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_delta_block %i\n",result);
-#endif
- return result;
- }
- }
-
- pmv[0].x =
- pmv[0].y = 0;
-
- current += 16*linesize;
- }
- }
- }
-
- *pict = *(AVFrame*)&s->current_picture;
-
-
- MPV_frame_end(s);
-
- *data_size=sizeof(AVFrame);
- return buf_size;
-}
-
-static int svq1_decode_init(AVCodecContext *avctx)
-{
- MpegEncContext *s = avctx->priv_data;
- int i;
-
- MPV_decode_defaults(s);
-
- s->avctx = avctx;
- s->width = (avctx->width+3)&~3;
- s->height = (avctx->height+3)&~3;
- 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,
- &svq1_block_type_vlc[0][1], 2, 1,
- &svq1_block_type_vlc[0][0], 2, 1);
-
- init_vlc(&svq1_motion_component, 7, 65,
- &svq1_motion_component_vlc[0][1], 4, 2,
- &svq1_motion_component_vlc[0][0], 4, 2);
-
- for (i = 0; i < 6; i++) {
- init_vlc(&svq1_intra_multistage[i], 3, 8,
- &svq1_intra_multistage_vlc[i][0][1], 2, 1,
- &svq1_intra_multistage_vlc[i][0][0], 2, 1);
- init_vlc(&svq1_inter_multistage[i], 3, 8,
- &svq1_inter_multistage_vlc[i][0][1], 2, 1,
- &svq1_inter_multistage_vlc[i][0][0], 2, 1);
- }
-
- init_vlc(&svq1_intra_mean, 8, 256,
- &svq1_intra_mean_vlc[0][1], 4, 2,
- &svq1_intra_mean_vlc[0][0], 4, 2);
-
- init_vlc(&svq1_inter_mean, 9, 512,
- &svq1_inter_mean_vlc[0][1], 4, 2,
- &svq1_inter_mean_vlc[0][0], 4, 2);
-
- return 0;
-}
-
-static int svq1_decode_end(AVCodecContext *avctx)
-{
- MpegEncContext *s = avctx->priv_data;
-
- MPV_common_end(s);
- 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,
- CODEC_ID_SVQ1,
- sizeof(MpegEncContext),
- svq1_decode_init,
- NULL,
- svq1_decode_end,
- svq1_decode_frame,
- 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