ref: e36ebb6fc2a996663e11170e2f91ca4153b12995
dir: /tools/input/section5.c/
/* * Copyright © 2019, VideoLAN and dav1d authors * Copyright © 2019, Two Orioles, LLC * Copyright © 2019, James Almer <[email protected]> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include "dav1d/headers.h" #include "input/demuxer.h" #include "input/parse.h" #define PROBE_SIZE 1024 static int section5_probe(const uint8_t *data) { int ret, cnt = 0; // Check that the first OBU is a Temporal Delimiter. size_t obu_size; enum Dav1dObuType type; ret = parse_obu_header(data + cnt, PROBE_SIZE - cnt, &obu_size, &type, 0); if (ret < 0 || type != DAV1D_OBU_TD || obu_size > 0) return 0; cnt += ret; // look for first frame and accompanying sequence header int seq = 0; while (cnt < PROBE_SIZE) { ret = parse_obu_header(data + cnt, PROBE_SIZE - cnt, &obu_size, &type, 0); if (ret < 0) return 0; cnt += ret; switch (type) { case DAV1D_OBU_SEQ_HDR: seq = 1; break; case DAV1D_OBU_FRAME: case DAV1D_OBU_FRAME_HDR: return seq; case DAV1D_OBU_TD: case DAV1D_OBU_TILE_GRP: return 0; default: break; } } return 0; } typedef struct DemuxerPriv { FILE *f; } Section5InputContext; static int section5_open(Section5InputContext *const c, const char *const file, unsigned fps[2], unsigned *const num_frames, unsigned timebase[2]) { if (!(c->f = fopen(file, "rb"))) { fprintf(stderr, "Failed to open %s: %s\n", file, strerror(errno)); return -1; } // TODO: Parse sequence header and read timing info if any. fps[0] = 25; fps[1] = 1; timebase[0] = 25; timebase[1] = 1; *num_frames = 0; for (;;) { uint8_t byte[2]; if (fread(&byte[0], 1, 1, c->f) < 1) break; const enum Dav1dObuType obu_type = (byte[0] >> 3) & 0xf; if (obu_type == DAV1D_OBU_TD) (*num_frames)++; const int has_length_field = byte[0] & 0x2; if (!has_length_field) return -1; const int has_extension = byte[0] & 0x4; if (has_extension && fread(&byte[1], 1, 1, c->f) < 1) return -1; size_t len; const int res = leb128(c->f, &len); if (res < 0) return -1; fseeko(c->f, len, SEEK_CUR); // skip packet } fseeko(c->f, 0, SEEK_SET); return 0; } static int section5_read(Section5InputContext *const c, Dav1dData *const data) { size_t total_bytes = 0; for (int first = 1;; first = 0) { uint8_t byte[2]; if (fread(&byte[0], 1, 1, c->f) < 1) { if (!first && feof(c->f)) break; return -1; } const enum Dav1dObuType obu_type = (byte[0] >> 3) & 0xf; if (first) { if (obu_type != DAV1D_OBU_TD) return -1; } else { if (obu_type == DAV1D_OBU_TD) { // include TD in next packet fseeko(c->f, -1, SEEK_CUR); break; } } const int has_length_field = byte[0] & 0x2; if (!has_length_field) return -1; const int has_extension = !!(byte[0] & 0x4); if (has_extension && fread(&byte[1], 1, 1, c->f) < 1) return -1; size_t len; const int res = leb128(c->f, &len); if (res < 0) return -1; total_bytes += 1 + has_extension + res + len; fseeko(c->f, len, SEEK_CUR); // skip packet, we'll read it below } fseeko(c->f, -(off_t)total_bytes, SEEK_CUR); uint8_t *ptr = dav1d_data_create(data, total_bytes); if (!ptr) return -1; if (fread(ptr, total_bytes, 1, c->f) != 1) { fprintf(stderr, "Failed to read frame data: %s\n", strerror(errno)); dav1d_data_unref(data); return -1; } return 0; } static void section5_close(Section5InputContext *const c) { fclose(c->f); } const Demuxer section5_demuxer = { .priv_data_size = sizeof(Section5InputContext), .name = "section5", .probe = section5_probe, .probe_sz = PROBE_SIZE, .open = section5_open, .read = section5_read, .close = section5_close, };