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1.5x-2x faster encoding for method 3 and up

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using token-buffer (that is: slightly more memory. O(output_size))

This change is ON by default. To return to previous behaviour, use
'cwebp -low_memory' or set config.low_memory to true.

Side-effect of this new mode: it forces 1 partition only (which was
default anyway), and makes some statistics about the bitstream
no longer available. cwebp will no longer report 'intra4-coeffs', etc.

This mode also doesn't work (yet) with multi-pass, and -low_memory
is currently forced for multi-pass.

also: reversed the flag: USE_TOKEN_BUFFER -> DISABLE_TOKEN_BUFFER
also: fixed the kAverageBytesPerMB estimate

Change-Id: I4ea80382038d6df4309663e0cb7bd88d9bca9cf1
This commit is contained in:
skal
2013-03-12 00:37:42 +01:00
committed by James Zern
parent be2fd1735a
commit 9bfbdd144f
10 changed files with 346 additions and 184 deletions
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30
examples/cwebp.c
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@ -229,6 +229,7 @@ static void PrintExtraInfoLossless(const WebPPicture* const pic,
}
static void PrintExtraInfoLossy(const WebPPicture* const pic, int short_output,
int full_details,
const char* const file_name) {
const WebPAuxStats* const stats = pic->stats;
if (short_output) {
@ -270,22 +271,26 @@ static void PrintExtraInfoLossy(const WebPPicture* const pic, int short_output,
fprintf(stderr, " Residuals bytes "
"|segment 1|segment 2|segment 3"
"|segment 4| total\n");
fprintf(stderr, " intra4-coeffs: ");
PrintByteCount(stats->residual_bytes[0], stats->coded_size, totals);
fprintf(stderr, " intra16-coeffs: ");
PrintByteCount(stats->residual_bytes[1], stats->coded_size, totals);
fprintf(stderr, " chroma coeffs: ");
PrintByteCount(stats->residual_bytes[2], stats->coded_size, totals);
if (full_details) {
fprintf(stderr, " intra4-coeffs: ");
PrintByteCount(stats->residual_bytes[0], stats->coded_size, totals);
fprintf(stderr, " intra16-coeffs: ");
PrintByteCount(stats->residual_bytes[1], stats->coded_size, totals);
fprintf(stderr, " chroma coeffs: ");
PrintByteCount(stats->residual_bytes[2], stats->coded_size, totals);
}
fprintf(stderr, " macroblocks: ");
PrintPercents(stats->segment_size, total);
fprintf(stderr, " quantizer: ");
PrintValues(stats->segment_quant);
fprintf(stderr, " filter level: ");
PrintValues(stats->segment_level);
fprintf(stderr, "------------------+---------");
fprintf(stderr, "+---------+---------+---------+-----------------\n");
fprintf(stderr, " segments total: ");
PrintByteCount(totals, stats->coded_size, NULL);
if (full_details) {
fprintf(stderr, "------------------+---------");
fprintf(stderr, "+---------+---------+---------+-----------------\n");
fprintf(stderr, " segments total: ");
PrintByteCount(totals, stats->coded_size, NULL);
}
}
if (stats->lossless_size > 0) {
PrintFullLosslessInfo(stats, "alpha");
@ -547,6 +552,7 @@ static void HelpLong(void) {
printf(" -crop <x> <y> <w> <h> .. crop picture with the given rectangle\n");
printf(" -resize <w> <h> ........ resize picture (after any cropping)\n");
printf(" -mt .................... use multi-threading if available\n");
printf(" -low_memory ............ reduce memory usage (slower encoding)\n");
#ifdef WEBP_EXPERIMENTAL_FEATURES
printf(" -444 / -422 / -gray ..... Change colorspace\n");
#endif
@ -727,6 +733,8 @@ int main(int argc, const char *argv[]) {
config.emulate_jpeg_size = 1;
} else if (!strcmp(argv[c], "-mt")) {
++config.thread_level; // increase thread level
} else if (!strcmp(argv[c], "-low_memory")) {
config.low_memory = 1;
} else if (!strcmp(argv[c], "-strong")) {
config.filter_type = 1;
} else if (!strcmp(argv[c], "-nostrong")) {
@ -980,7 +988,7 @@ int main(int argc, const char *argv[]) {
if (config.lossless) {
PrintExtraInfoLossless(&picture, short_output, in_file);
} else {
PrintExtraInfoLossy(&picture, short_output, in_file);
PrintExtraInfoLossy(&picture, short_output, config.low_memory, in_file);
}
}
if (!quiet && !short_output && print_distortion >= 0) { // print distortion