mirror of https://github.com/FFmpeg/FFmpeg.git
252 lines
8.2 KiB
C
252 lines
8.2 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/mem.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "jpegxs.h"
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#include "parser.h"
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#include "parser_internal.h"
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typedef struct JPEGXSParseContext {
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ParseContext pc;
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int eoc_found;
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} JPEGXSParseContext;
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/**
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* Find the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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static int jpegxs_find_frame_end(JPEGXSParseContext *jpegxs, const uint8_t *buf,
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int buf_size)
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{
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ParseContext *pc = &jpegxs->pc;
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int pic_found, i = 0;
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uint32_t state;
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pic_found = pc->frame_start_found;
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state = pc->state;
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if (!pic_found) {
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for (i = 0; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if ((uint16_t)state == JPEGXS_MARKER_SOC) {
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i++;
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pic_found = 1;
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break;
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}
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}
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}
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if (buf_size == 0) {
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if (jpegxs->eoc_found) {
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pc->frame_start_found = jpegxs->eoc_found = 0;
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pc->state = -1;
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}
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return 0;
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}
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while (pic_found && i < buf_size) {
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if (jpegxs->eoc_found) {
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for(; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if ((state >> 16) == JPEGXS_MARKER_EOC) {
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if ((uint16_t)state == JPEGXS_MARKER_SOC) {
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// New image
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pc->frame_start_found = jpegxs->eoc_found = 0;
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pc->state = -1;
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return i - 1;
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} else {
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// False positive
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i++;
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jpegxs->eoc_found = 0;
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break;
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}
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}
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}
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}
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for(; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if ((uint16_t)state == JPEGXS_MARKER_EOC) {
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// EOC candidate
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i++;
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jpegxs->eoc_found = 1;
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break;
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}
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}
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}
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pc->frame_start_found = pic_found;
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pc->state = state;
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return END_NOT_FOUND;
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}
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static int jpegxs_parse_frame(AVCodecParserContext *s, AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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GetByteContext gbc;
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GetBitContext gb;
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int8_t bpc[3], log2_chroma_w[3], log2_chroma_h[3];
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int size, marker, components;
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s->key_frame = 1;
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s->pict_type = AV_PICTURE_TYPE_I;
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if (buf_size < 4)
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return 0;
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bytestream2_init(&gbc, buf, buf_size);
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marker = bytestream2_get_be16(&gbc);
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if (marker != JPEGXS_MARKER_SOC)
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return 0;
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marker = bytestream2_get_be16(&gbc);
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if (marker != JPEGXS_MARKER_CAP)
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return 0;
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size = bytestream2_get_be16(&gbc);
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bytestream2_skip(&gbc, FFMAX(size - 2, 0));
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marker = bytestream2_get_be16(&gbc);
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if (marker != JPEGXS_MARKER_PIH)
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return 0;
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size = bytestream2_get_be16(&gbc);
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bytestream2_skip(&gbc, 4); // Lcod
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bytestream2_skip(&gbc, 2); // Ppih
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bytestream2_skip(&gbc, 2); // Plev
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size -= 8;
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s->width = bytestream2_get_be16(&gbc);
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s->height = bytestream2_get_be16(&gbc);
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size -= 4;
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bytestream2_skip(&gbc, 2); // Cw
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bytestream2_skip(&gbc, 2); // Hsl
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size -= 4;
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components = bytestream2_get_byte(&gbc);
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if (components != 1 && components != 3)
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return 0;
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size--;
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bytestream2_skip(&gbc, FFMAX(size - 2, 0));
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while (bytestream2_get_bytes_left(&gbc) > 0) {
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marker = bytestream2_get_be16(&gbc);
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switch(marker) {
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case JPEGXS_MARKER_CDT:
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size = bytestream2_get_be16(&gbc);
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init_get_bits8(&gb, gbc.buffer, FFMIN(FFMAX(size - 2, 0), bytestream2_get_bytes_left(&gbc)));
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for (int i = 0; i < components; i++) {
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bpc[i] = get_bits(&gb, 8);
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if (i && bpc[i] != bpc[i-1])
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return 0;
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log2_chroma_w[i] = get_bits(&gb, 4);
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log2_chroma_h[i] = get_bits(&gb, 4);
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if (log2_chroma_h[i] > log2_chroma_w[i])
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return 0;
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if (i == 2 && (log2_chroma_h[2] != log2_chroma_h[1] ||
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log2_chroma_w[2] != log2_chroma_w[1]))
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return 0;
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}
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switch (bpc[0]) {
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case 8:
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if (components == 1) s->format = AV_PIX_FMT_GRAY8;
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else if (log2_chroma_w[1] == 1 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV444P;
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else if (log2_chroma_w[1] == 2 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV422P;
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else s->format = AV_PIX_FMT_YUV420P;
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break;
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case 10:
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if (components == 1) s->format = AV_PIX_FMT_GRAY10;
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else if (log2_chroma_w[1] == 1 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV444P10;
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else if (log2_chroma_w[1] == 2 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV422P10;
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else s->format = AV_PIX_FMT_YUV420P10;
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break;
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case 12:
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if (components == 1) s->format = AV_PIX_FMT_GRAY12;
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else if (log2_chroma_w[1] == 1 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV444P12;
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else if (log2_chroma_w[1] == 2 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV422P12;
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else s->format = AV_PIX_FMT_YUV420P12;
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break;
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case 14:
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if (components == 1) s->format = AV_PIX_FMT_GRAY14;
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else if (log2_chroma_w[1] == 1 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV444P14;
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else if (log2_chroma_w[1] == 2 && log2_chroma_h[1] == 1) s->format = AV_PIX_FMT_YUV422P14;
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else s->format = AV_PIX_FMT_YUV420P14;
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break;
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default:
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s->format = AV_PIX_FMT_NONE;
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break;
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}
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return 0;
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default:
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size = bytestream2_get_be16(&gbc);
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bytestream2_skip(&gbc, FFMAX(size - 2, 0));
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break;
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}
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}
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return 0;
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}
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static int jpegxsvideo_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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JPEGXSParseContext *jpegxs = s->priv_data;
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ParseContext *pc = &jpegxs->pc;
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int next;
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next = jpegxs_find_frame_end(jpegxs, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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jpegxs_parse_frame(s, avctx, buf, buf_size);
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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static av_cold void jpegxsparse_close(AVCodecParserContext *s)
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{
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JPEGXSParseContext *jpegxs = s->priv_data;
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ParseContext *pc = &jpegxs->pc;
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av_freep(&pc->buffer);
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}
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const FFCodecParser ff_jpegxs_parser = {
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PARSER_CODEC_LIST(AV_CODEC_ID_JPEGXS),
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.priv_data_size = sizeof(JPEGXSParseContext),
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.parse = jpegxsvideo_parse,
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.close = jpegxsparse_close,
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};
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