ref: fe44861b1d7730d888aa5af36fbb108b578f22e0
dir: /tools/input/annexb.c/
/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * Copyright © 2019, James Almer <jamrial@gmail.com> * 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 "common/intops.h" #include "dav1d/headers.h" #include "input/demuxer.h" #include "input/parse.h" // these functions are based on an implementation from FFmpeg, and relicensed // with author's permission #define PROBE_SIZE 1024 static int annexb_probe(const uint8_t *data) { int ret, cnt = 0; size_t temporal_unit_size; ret = leb(data + cnt, PROBE_SIZE - cnt, &temporal_unit_size); if (ret < 0) return 0; cnt += ret; size_t frame_unit_size; ret = leb(data + cnt, PROBE_SIZE - cnt, &frame_unit_size); if (ret < 0 || ((uint64_t)frame_unit_size + ret) > temporal_unit_size) return 0; cnt += ret; temporal_unit_size -= ret; size_t obu_unit_size; ret = leb(data + cnt, PROBE_SIZE - cnt, &obu_unit_size); if (ret < 0 || ((uint64_t)obu_unit_size + ret) >= frame_unit_size) return 0; cnt += ret; temporal_unit_size -= obu_unit_size + ret; frame_unit_size -= obu_unit_size + ret; // Check that the first OBU is a Temporal Delimiter. size_t obu_size; enum Dav1dObuType type; ret = parse_obu_header(data + cnt, imin(PROBE_SIZE - cnt, (int) obu_unit_size), &obu_size, &type, 1); if (ret < 0 || type != DAV1D_OBU_TD || obu_size > 0) return 0; cnt += (int)obu_unit_size; // look for first frame and accompanying sequence header int seq = 0; while (cnt < PROBE_SIZE) { ret = leb(data + cnt, PROBE_SIZE - cnt, &obu_unit_size); if (ret < 0 || ((uint64_t)obu_unit_size + ret) > frame_unit_size) return 0; cnt += ret; temporal_unit_size -= ret; frame_unit_size -= ret; ret = parse_obu_header(data + cnt, imin(PROBE_SIZE - cnt, (int) obu_unit_size), &obu_size, &type, 1); if (ret < 0) return 0; cnt += (int)obu_unit_size; 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; } temporal_unit_size -= obu_unit_size; frame_unit_size -= obu_unit_size; if (frame_unit_size <= 0) break; } return 0; } typedef struct DemuxerPriv { FILE *f; size_t temporal_unit_size; size_t frame_unit_size; } AnnexbInputContext; static int annexb_open(AnnexbInputContext *const c, const char *const file, unsigned fps[2], unsigned *const num_frames, unsigned timebase[2]) { int res; size_t len; 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; for (*num_frames = 0;; (*num_frames)++) { res = leb128(c->f, &len); if (res < 0) break; fseeko(c->f, len, SEEK_CUR); } fseeko(c->f, 0, SEEK_SET); return 0; } static int annexb_read(AnnexbInputContext *const c, Dav1dData *const data) { size_t len; int res; if (!c->temporal_unit_size) { res = leb128(c->f, &c->temporal_unit_size); if (res < 0) return -1; } if (!c->frame_unit_size) { res = leb128(c->f, &c->frame_unit_size); if (res < 0 || (c->frame_unit_size + res) > c->temporal_unit_size) return -1; c->temporal_unit_size -= res; } res = leb128(c->f, &len); if (res < 0 || (len + res) > c->frame_unit_size) return -1; uint8_t *ptr = dav1d_data_create(data, len); if (!ptr) return -1; c->temporal_unit_size -= len + res; c->frame_unit_size -= len + res; if (fread(ptr, len, 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 annexb_close(AnnexbInputContext *const c) { fclose(c->f); } const Demuxer annexb_demuxer = { .priv_data_size = sizeof(AnnexbInputContext), .name = "annexb", .probe = annexb_probe, .probe_sz = PROBE_SIZE, .open = annexb_open, .read = annexb_read, .close = annexb_close, };