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authorMatt A. Tobin <email@mattatobin.com>2020-04-07 23:30:51 -0400
committerMatt A. Tobin <email@mattatobin.com>2020-04-07 23:30:51 -0400
commit5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb (patch)
tree45d55e3e5e73c4255c4d71258d9be5b2d004d28f /third_party/aom/examples/scalable_decoder.c
parent50f1986697a7412e4160976fa5e11217b4ef1f44 (diff)
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Move aom source to a sub-directory under media/libaom
There is no damned reason to treat this differently than any other media lib given its license and there never was.
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diff --git a/third_party/aom/examples/scalable_decoder.c b/third_party/aom/examples/scalable_decoder.c
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-/*
- * Copyright (c) 2018, Alliance for Open Media. All rights reserved
- *
- * This source code is subject to the terms of the BSD 2 Clause License and
- * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
- * was not distributed with this source code in the LICENSE file, you can
- * obtain it at www.aomedia.org/license/software. If the Alliance for Open
- * Media Patent License 1.0 was not distributed with this source code in the
- * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
- */
-
-// Scalable Decoder
-// ==============
-//
-// This is an example of a scalable decoder loop. It takes a 2-spatial-layer
-// input file
-// containing the compressed data (in OBU format), passes it through the
-// decoder, and writes the decompressed frames to disk. The base layer and
-// enhancement layers are stored as separate files, out_lyr0.yuv and
-// out_lyr1.yuv, respectively.
-//
-// Standard Includes
-// -----------------
-// For decoders, you only have to include `aom_decoder.h` and then any
-// header files for the specific codecs you use. In this case, we're using
-// av1.
-//
-// Initializing The Codec
-// ----------------------
-// The libaom decoder is initialized by the call to aom_codec_dec_init().
-// Determining the codec interface to use is handled by AvxVideoReader and the
-// functions prefixed with aom_video_reader_. Discussion of those functions is
-// beyond the scope of this example, but the main gist is to open the input file
-// and parse just enough of it to determine if it's a AVx file and which AVx
-// codec is contained within the file.
-// Note the NULL pointer passed to aom_codec_dec_init(). We do that in this
-// example because we want the algorithm to determine the stream configuration
-// (width/height) and allocate memory automatically.
-//
-// Decoding A Frame
-// ----------------
-// Once the frame has been read into memory, it is decoded using the
-// `aom_codec_decode` function. The call takes a pointer to the data
-// (`frame`) and the length of the data (`frame_size`). No application data
-// is associated with the frame in this example, so the `user_priv`
-// parameter is NULL. The `deadline` parameter is left at zero for this
-// example. This parameter is generally only used when doing adaptive post
-// processing.
-//
-// Codecs may produce a variable number of output frames for every call to
-// `aom_codec_decode`. These frames are retrieved by the
-// `aom_codec_get_frame` iterator function. The iterator variable `iter` is
-// initialized to NULL each time `aom_codec_decode` is called.
-// `aom_codec_get_frame` is called in a loop, returning a pointer to a
-// decoded image or NULL to indicate the end of list.
-//
-// Processing The Decoded Data
-// ---------------------------
-// In this example, we simply write the encoded data to disk. It is
-// important to honor the image's `stride` values.
-//
-// Cleanup
-// -------
-// The `aom_codec_destroy` call frees any memory allocated by the codec.
-//
-// Error Handling
-// --------------
-// This example does not special case any error return codes. If there was
-// an error, a descriptive message is printed and the program exits. With
-// few exceptions, aom_codec functions return an enumerated error status,
-// with the value `0` indicating success.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "aom/aom_decoder.h"
-#include "aom/aomdx.h"
-#include "common/obudec.h"
-#include "common/tools_common.h"
-#include "common/video_reader.h"
-
-static const char *exec_name;
-
-#define MAX_LAYERS 5
-
-void usage_exit(void) {
- fprintf(stderr, "Usage: %s <infile>\n", exec_name);
- exit(EXIT_FAILURE);
-}
-
-int main(int argc, char **argv) {
- int frame_cnt = 0;
- FILE *outfile[MAX_LAYERS];
- char filename[80];
- aom_codec_ctx_t codec;
- const AvxInterface *decoder = NULL;
- FILE *inputfile = NULL;
- uint8_t *buf = NULL;
- size_t bytes_in_buffer = 0;
- size_t buffer_size = 0;
- struct AvxInputContext aom_input_ctx;
- struct ObuDecInputContext obu_ctx = { &aom_input_ctx, NULL, 0, 0, 0 };
- aom_codec_stream_info_t si;
- uint8_t tmpbuf[32];
- unsigned int i;
-
- exec_name = argv[0];
-
- if (argc != 2) die("Invalid number of arguments.");
-
- if (!(inputfile = fopen(argv[1], "rb")))
- die("Failed to open %s for read.", argv[1]);
- obu_ctx.avx_ctx->file = inputfile;
- obu_ctx.avx_ctx->filename = argv[1];
-
- decoder = get_aom_decoder_by_index(0);
- printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
-
- if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
- die_codec(&codec, "Failed to initialize decoder.");
-
- if (aom_codec_control(&codec, AV1D_SET_OUTPUT_ALL_LAYERS, 1)) {
- die_codec(&codec, "Failed to set output_all_layers control.");
- }
-
- // peak sequence header OBU to get number of spatial layers
- const size_t ret = fread(tmpbuf, 1, 32, inputfile);
- if (ret != 32) die_codec(&codec, "Input is not a valid obu file");
- si.is_annexb = 0;
- if (aom_codec_peek_stream_info(decoder->codec_interface(), tmpbuf, 32, &si)) {
- die_codec(&codec, "Input is not a valid obu file");
- }
- fseek(inputfile, -32, SEEK_CUR);
-
- if (!file_is_obu(&obu_ctx))
- die_codec(&codec, "Input is not a valid obu file");
-
- // open base layer output yuv file
- snprintf(filename, sizeof(filename), "out_lyr%d.yuv", 0);
- if (!(outfile[0] = fopen(filename, "wb")))
- die("Failed top open output for writing.");
-
- // open any enhancement layer output yuv files
- for (i = 1; i < si.number_spatial_layers; i++) {
- snprintf(filename, sizeof(filename), "out_lyr%d.yuv", i);
- if (!(outfile[i] = fopen(filename, "wb")))
- die("Failed to open output for writing.");
- }
-
- while (!obudec_read_temporal_unit(&obu_ctx, &buf, &bytes_in_buffer,
- &buffer_size)) {
- aom_codec_iter_t iter = NULL;
- aom_image_t *img = NULL;
- if (aom_codec_decode(&codec, buf, bytes_in_buffer, NULL))
- die_codec(&codec, "Failed to decode frame.");
-
- while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
- aom_image_t *img_shifted =
- aom_img_alloc(NULL, AOM_IMG_FMT_I420, img->d_w, img->d_h, 16);
- img_shifted->bit_depth = 8;
- aom_img_downshift(img_shifted, img,
- img->bit_depth - img_shifted->bit_depth);
- if (img->spatial_id == 0) {
- printf("Writing base layer 0 %d\n", frame_cnt);
- aom_img_write(img_shifted, outfile[0]);
- } else if (img->spatial_id <= (int)(si.number_spatial_layers - 1)) {
- printf("Writing enhancement layer %d %d\n", img->spatial_id, frame_cnt);
- aom_img_write(img_shifted, outfile[img->spatial_id]);
- } else {
- die_codec(&codec, "Invalid bitstream. Layer id exceeds layer count");
- }
- if (img->spatial_id == (int)(si.number_spatial_layers - 1)) ++frame_cnt;
- }
- }
-
- printf("Processed %d frames.\n", frame_cnt);
- if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
-
- for (i = 0; i < si.number_spatial_layers; i++) fclose(outfile[i]);
-
- fclose(inputfile);
-
- return EXIT_SUCCESS;
-}