Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * BMP image format encoder |
||
| 3 | * Copyright (c) 2006, 2007 Michel Bardiaux |
||
| 4 | * Copyright (c) 2009 Daniel Verkamp |
||
| 5 | * |
||
| 6 | * This file is part of FFmpeg. |
||
| 7 | * |
||
| 8 | * FFmpeg is free software; you can redistribute it and/or |
||
| 9 | * modify it under the terms of the GNU Lesser General Public |
||
| 10 | * License as published by the Free Software Foundation; either |
||
| 11 | * version 2.1 of the License, or (at your option) any later version. |
||
| 12 | * |
||
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 16 | * Lesser General Public License for more details. |
||
| 17 | * |
||
| 18 | * You should have received a copy of the GNU Lesser General Public |
||
| 19 | * License along with FFmpeg; if not, write to the Free Software |
||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 21 | */ |
||
| 22 | |||
| 23 | #include "libavutil/imgutils.h" |
||
| 24 | #include "libavutil/avassert.h" |
||
| 25 | #include "avcodec.h" |
||
| 26 | #include "bytestream.h" |
||
| 27 | #include "bmp.h" |
||
| 28 | #include "internal.h" |
||
| 29 | |||
| 30 | static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; |
||
| 31 | static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F }; |
||
| 32 | static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F }; |
||
| 33 | |||
| 34 | static av_cold int bmp_encode_init(AVCodecContext *avctx){ |
||
| 35 | switch (avctx->pix_fmt) { |
||
| 36 | case AV_PIX_FMT_BGRA: |
||
| 37 | avctx->bits_per_coded_sample = 32; |
||
| 38 | break; |
||
| 39 | case AV_PIX_FMT_BGR24: |
||
| 40 | avctx->bits_per_coded_sample = 24; |
||
| 41 | break; |
||
| 42 | case AV_PIX_FMT_RGB555: |
||
| 43 | case AV_PIX_FMT_RGB565: |
||
| 44 | case AV_PIX_FMT_RGB444: |
||
| 45 | avctx->bits_per_coded_sample = 16; |
||
| 46 | break; |
||
| 47 | case AV_PIX_FMT_RGB8: |
||
| 48 | case AV_PIX_FMT_BGR8: |
||
| 49 | case AV_PIX_FMT_RGB4_BYTE: |
||
| 50 | case AV_PIX_FMT_BGR4_BYTE: |
||
| 51 | case AV_PIX_FMT_GRAY8: |
||
| 52 | case AV_PIX_FMT_PAL8: |
||
| 53 | avctx->bits_per_coded_sample = 8; |
||
| 54 | break; |
||
| 55 | case AV_PIX_FMT_MONOBLACK: |
||
| 56 | avctx->bits_per_coded_sample = 1; |
||
| 57 | break; |
||
| 58 | default: |
||
| 59 | av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); |
||
| 60 | return AVERROR(EINVAL); |
||
| 61 | } |
||
| 62 | |||
| 63 | return 0; |
||
| 64 | } |
||
| 65 | |||
| 66 | static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
||
| 67 | const AVFrame *pict, int *got_packet) |
||
| 68 | { |
||
| 69 | const AVFrame * const p = pict; |
||
| 70 | int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret; |
||
| 71 | const uint32_t *pal = NULL; |
||
| 72 | uint32_t palette256[256]; |
||
| 73 | int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB; |
||
| 74 | int bit_count = avctx->bits_per_coded_sample; |
||
| 75 | uint8_t *ptr, *buf; |
||
| 76 | |||
| 77 | #if FF_API_CODED_FRAME |
||
| 78 | FF_DISABLE_DEPRECATION_WARNINGS |
||
| 79 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
||
| 80 | avctx->coded_frame->key_frame = 1; |
||
| 81 | FF_ENABLE_DEPRECATION_WARNINGS |
||
| 82 | #endif |
||
| 83 | switch (avctx->pix_fmt) { |
||
| 84 | case AV_PIX_FMT_RGB444: |
||
| 85 | compression = BMP_BITFIELDS; |
||
| 86 | pal = rgb444_masks; // abuse pal to hold color masks |
||
| 87 | pal_entries = 3; |
||
| 88 | break; |
||
| 89 | case AV_PIX_FMT_RGB565: |
||
| 90 | compression = BMP_BITFIELDS; |
||
| 91 | pal = rgb565_masks; // abuse pal to hold color masks |
||
| 92 | pal_entries = 3; |
||
| 93 | break; |
||
| 94 | case AV_PIX_FMT_RGB8: |
||
| 95 | case AV_PIX_FMT_BGR8: |
||
| 96 | case AV_PIX_FMT_RGB4_BYTE: |
||
| 97 | case AV_PIX_FMT_BGR4_BYTE: |
||
| 98 | case AV_PIX_FMT_GRAY8: |
||
| 99 | av_assert1(bit_count == 8); |
||
| 100 | avpriv_set_systematic_pal2(palette256, avctx->pix_fmt); |
||
| 101 | pal = palette256; |
||
| 102 | break; |
||
| 103 | case AV_PIX_FMT_PAL8: |
||
| 104 | pal = (uint32_t *)p->data[1]; |
||
| 105 | break; |
||
| 106 | case AV_PIX_FMT_MONOBLACK: |
||
| 107 | pal = monoblack_pal; |
||
| 108 | break; |
||
| 109 | } |
||
| 110 | if (pal && !pal_entries) pal_entries = 1 << bit_count; |
||
| 111 | n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL; |
||
| 112 | pad_bytes_per_row = (4 - n_bytes_per_row) & 3; |
||
| 113 | n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row); |
||
| 114 | |||
| 115 | // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER |
||
| 116 | // and related pages. |
||
| 117 | #define SIZE_BITMAPFILEHEADER 14 |
||
| 118 | #define SIZE_BITMAPINFOHEADER 40 |
||
| 119 | hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2); |
||
| 120 | n_bytes = n_bytes_image + hsize; |
||
| 121 | if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes, 0)) < 0) |
||
| 122 | return ret; |
||
| 123 | buf = pkt->data; |
||
| 124 | bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType |
||
| 125 | bytestream_put_byte(&buf, 'M'); // do. |
||
| 126 | bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize |
||
| 127 | bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 |
||
| 128 | bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 |
||
| 129 | bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits |
||
| 130 | bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize |
||
| 131 | bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth |
||
| 132 | bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight |
||
| 133 | bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes |
||
| 134 | bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount |
||
| 135 | bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression |
||
| 136 | bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage |
||
| 137 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter |
||
| 138 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter |
||
| 139 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed |
||
| 140 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant |
||
| 141 | for (i = 0; i < pal_entries; i++) |
||
| 142 | bytestream_put_le32(&buf, pal[i] & 0xFFFFFF); |
||
| 143 | // BMP files are bottom-to-top so we start from the end... |
||
| 144 | ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; |
||
| 145 | buf = pkt->data + hsize; |
||
| 146 | for(i = 0; i < avctx->height; i++) { |
||
| 147 | if (bit_count == 16) { |
||
| 148 | const uint16_t *src = (const uint16_t *) ptr; |
||
| 149 | uint16_t *dst = (uint16_t *) buf; |
||
| 150 | for(n = 0; n < avctx->width; n++) |
||
| 151 | AV_WL16(dst + n, src[n]); |
||
| 152 | } else { |
||
| 153 | memcpy(buf, ptr, n_bytes_per_row); |
||
| 154 | } |
||
| 155 | buf += n_bytes_per_row; |
||
| 156 | memset(buf, 0, pad_bytes_per_row); |
||
| 157 | buf += pad_bytes_per_row; |
||
| 158 | ptr -= p->linesize[0]; // ... and go back |
||
| 159 | } |
||
| 160 | |||
| 161 | pkt->flags |= AV_PKT_FLAG_KEY; |
||
| 162 | *got_packet = 1; |
||
| 163 | return 0; |
||
| 164 | } |
||
| 165 | |||
| 166 | AVCodec ff_bmp_encoder = { |
||
| 167 | .name = "bmp", |
||
| 168 | .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"), |
||
| 169 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 170 | .id = AV_CODEC_ID_BMP, |
||
| 171 | .init = bmp_encode_init, |
||
| 172 | .encode2 = bmp_encode_frame, |
||
| 173 | .pix_fmts = (const enum AVPixelFormat[]){ |
||
| 174 | AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24, |
||
| 175 | AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444, |
||
| 176 | AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, |
||
| 177 | AV_PIX_FMT_MONOBLACK, |
||
| 178 | AV_PIX_FMT_NONE |
||
| 179 | }, |
||
| 180 | }; |