diff options
Diffstat (limited to 'chromium/third_party/libvpx/source/libvpx/examples/decode_with_partial_drops.txt')
-rw-r--r-- | chromium/third_party/libvpx/source/libvpx/examples/decode_with_partial_drops.txt | 238 |
1 files changed, 0 insertions, 238 deletions
diff --git a/chromium/third_party/libvpx/source/libvpx/examples/decode_with_partial_drops.txt b/chromium/third_party/libvpx/source/libvpx/examples/decode_with_partial_drops.txt deleted file mode 100644 index 7b0d3d2ca8e..00000000000 --- a/chromium/third_party/libvpx/source/libvpx/examples/decode_with_partial_drops.txt +++ /dev/null @@ -1,238 +0,0 @@ -@TEMPLATE decoder_tmpl.c -Decode With Partial Drops Example -========================= -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION -This is an example utility which drops a series of frames (or parts of frames), -as specified on the command line. This is useful for observing the error -recovery features of the codec. -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_INCLUDES -#include <time.h> -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_INCLUDES - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HELPERS -struct parsed_header -{ - char key_frame; - int version; - char show_frame; - int first_part_size; -}; - -int next_packet(struct parsed_header* hdr, int pos, int length, int mtu) -{ - int size = 0; - int remaining = length - pos; - /* Uncompressed part is 3 bytes for P frames and 10 bytes for I frames */ - int uncomp_part_size = (hdr->key_frame ? 10 : 3); - /* number of bytes yet to send from header and the first partition */ - int remainFirst = uncomp_part_size + hdr->first_part_size - pos; - if (remainFirst > 0) - { - if (remainFirst <= mtu) - { - size = remainFirst; - } - else - { - size = mtu; - } - - return size; - } - - /* second partition; just slot it up according to MTU */ - if (remaining <= mtu) - { - size = remaining; - return size; - } - return mtu; -} - -void throw_packets(unsigned char* frame, int* size, int loss_rate, - int* thrown, int* kept) -{ - unsigned char loss_frame[256*1024]; - int pkg_size = 1; - int pos = 0; - int loss_pos = 0; - struct parsed_header hdr; - unsigned int tmp; - int mtu = 1500; - - if (*size < 3) - { - return; - } - putc('|', stdout); - /* parse uncompressed 3 bytes */ - tmp = (frame[2] << 16) | (frame[1] << 8) | frame[0]; - hdr.key_frame = !(tmp & 0x1); /* inverse logic */ - hdr.version = (tmp >> 1) & 0x7; - hdr.show_frame = (tmp >> 4) & 0x1; - hdr.first_part_size = (tmp >> 5) & 0x7FFFF; - - /* don't drop key frames */ - if (hdr.key_frame) - { - int i; - *kept = *size/mtu + ((*size % mtu > 0) ? 1 : 0); /* approximate */ - for (i=0; i < *kept; i++) - putc('.', stdout); - return; - } - - while ((pkg_size = next_packet(&hdr, pos, *size, mtu)) > 0) - { - int loss_event = ((rand() + 1.0)/(RAND_MAX + 1.0) < loss_rate/100.0); - if (*thrown == 0 && !loss_event) - { - memcpy(loss_frame + loss_pos, frame + pos, pkg_size); - loss_pos += pkg_size; - (*kept)++; - putc('.', stdout); - } - else - { - (*thrown)++; - putc('X', stdout); - } - pos += pkg_size; - } - memcpy(frame, loss_frame, loss_pos); - memset(frame + loss_pos, 0, *size - loss_pos); - *size = loss_pos; -} -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HELPERS - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DEC_INIT -/* Initialize codec */ -flags = VPX_CODEC_USE_ERROR_CONCEALMENT; -res = vpx_codec_dec_init(&codec, interface, &dec_cfg, flags); -if(res) - die_codec(&codec, "Failed to initialize decoder"); - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DEC_INIT - -Usage ------ -This example adds a single argument to the `simple_decoder` example, -which specifies the range or pattern of frames to drop. The parameter is -parsed as follows: - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USAGE -if(argc < 4 || argc > 6) - die("Usage: %s <infile> <outfile> [-t <num threads>] <N-M|N/M|L,S>\n", - argv[0]); -{ - char *nptr; - int arg_num = 3; - if (argc == 6 && strncmp(argv[arg_num++], "-t", 2) == 0) - dec_cfg.threads = strtol(argv[arg_num++], NULL, 0); - n = strtol(argv[arg_num], &nptr, 0); - mode = (*nptr == '\0' || *nptr == ',') ? 2 : (*nptr == '-') ? 1 : 0; - - m = strtol(nptr+1, NULL, 0); - if((!n && !m) || (*nptr != '-' && *nptr != '/' && - *nptr != '\0' && *nptr != ',')) - die("Couldn't parse pattern %s\n", argv[3]); -} -seed = (m > 0) ? m : (unsigned int)time(NULL); -srand(seed);thrown_frame = 0; -printf("Seed: %u\n", seed); -printf("Threads: %d\n", dec_cfg.threads); -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USAGE - - -Dropping A Range Of Frames --------------------------- -To drop a range of frames, specify the starting frame and the ending -frame to drop, separated by a dash. The following command will drop -frames 5 through 10 (base 1). - - $ ./decode_with_partial_drops in.ivf out.i420 5-10 - - -Dropping A Pattern Of Frames ----------------------------- -To drop a pattern of frames, specify the number of frames to drop and -the number of frames after which to repeat the pattern, separated by -a forward-slash. The following command will drop 3 of 7 frames. -Specifically, it will decode 4 frames, then drop 3 frames, and then -repeat. - - $ ./decode_with_partial_drops in.ivf out.i420 3/7 - -Dropping Random Parts Of Frames -------------------------------- -A third argument tuple is available to split the frame into 1500 bytes pieces -and randomly drop pieces rather than frames. The frame will be split at -partition boundaries where possible. The following example will seed the RNG -with the seed 123 and drop approximately 5% of the pieces. Pieces which -are depending on an already dropped piece will also be dropped. - - $ ./decode_with_partial_drops in.ivf out.i420 5,123 - - -Extra Variables ---------------- -This example maintains the pattern passed on the command line in the -`n`, `m`, and `is_range` variables: - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_VARS -int n, m, mode; -unsigned int seed; -int thrown=0, kept=0; -int thrown_frame=0, kept_frame=0; -vpx_codec_dec_cfg_t dec_cfg = {0}; -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_VARS - - -Making The Drop Decision ------------------------- -The example decides whether to drop the frame based on the current -frame number, immediately before decoding the frame. - -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PRE_DECODE -/* Decide whether to throw parts of the frame or the whole frame - depending on the drop mode */ -thrown_frame = 0; -kept_frame = 0; -switch (mode) -{ -case 0: - if (m - (frame_cnt-1)%m <= n) - { - frame_sz = 0; - } - break; -case 1: - if (frame_cnt >= n && frame_cnt <= m) - { - frame_sz = 0; - } - break; -case 2: - throw_packets(frame, &frame_sz, n, &thrown_frame, &kept_frame); - break; -default: break; -} -if (mode < 2) -{ - if (frame_sz == 0) - { - putc('X', stdout); - thrown_frame++; - } - else - { - putc('.', stdout); - kept_frame++; - } -} -thrown += thrown_frame; -kept += kept_frame; -fflush(stdout); -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PRE_DECODE |