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