diff options
Diffstat (limited to 'third_party/dav1d/tools/input/annexb.c')
| -rw-r--r-- | third_party/dav1d/tools/input/annexb.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/third_party/dav1d/tools/input/annexb.c b/third_party/dav1d/tools/input/annexb.c new file mode 100644 index 0000000000..032480d00c --- /dev/null +++ b/third_party/dav1d/tools/input/annexb.c @@ -0,0 +1,195 @@ +/* + * 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, +}; |