[deb_ffmpeg.git] / ffmpeg / libavcodec / bmpenc.c

/*
 * BMP image format encoder
 * Copyright (c) 2006, 2007 Michel Bardiaux
 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
 *
 * 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/imgutils.h"
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "bytestream.h"
#include "bmp.h"
#include "internal.h"

static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
static const uint32_t rgb565_masks[]  = { 0xF800, 0x07E0, 0x001F };
static const uint32_t rgb444_masks[]  = { 0x0F00, 0x00F0, 0x000F };

static av_cold int bmp_encode_init(AVCodecContext *avctx){
    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_BGRA:
        avctx->bits_per_coded_sample = 32;
        break;
    case AV_PIX_FMT_BGR24:
        avctx->bits_per_coded_sample = 24;
        break;
    case AV_PIX_FMT_RGB555:
    case AV_PIX_FMT_RGB565:
    case AV_PIX_FMT_RGB444:
        avctx->bits_per_coded_sample = 16;
        break;
    case AV_PIX_FMT_RGB8:
    case AV_PIX_FMT_BGR8:
    case AV_PIX_FMT_RGB4_BYTE:
    case AV_PIX_FMT_BGR4_BYTE:
    case AV_PIX_FMT_GRAY8:
    case AV_PIX_FMT_PAL8:
        avctx->bits_per_coded_sample = 8;
        break;
    case AV_PIX_FMT_MONOBLACK:
        avctx->bits_per_coded_sample = 1;
        break;
    default:
        av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
        return AVERROR(EINVAL);
    }

    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

    return 0;
}

static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                            const AVFrame *pict, int *got_packet)
{
    const AVFrame * const p = pict;
    int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret;
    const uint32_t *pal = NULL;
    uint32_t palette256[256];
    int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB;
    int bit_count = avctx->bits_per_coded_sample;
    uint8_t *ptr, *buf;

    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;
    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_RGB444:
        compression = BMP_BITFIELDS;
        pal = rgb444_masks; // abuse pal to hold color masks
        pal_entries = 3;
        break;
    case AV_PIX_FMT_RGB565:
        compression = BMP_BITFIELDS;
        pal = rgb565_masks; // abuse pal to hold color masks
        pal_entries = 3;
        break;
    case AV_PIX_FMT_RGB8:
    case AV_PIX_FMT_BGR8:
    case AV_PIX_FMT_RGB4_BYTE:
    case AV_PIX_FMT_BGR4_BYTE:
    case AV_PIX_FMT_GRAY8:
        av_assert1(bit_count == 8);
        avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
        pal = palette256;
        break;
    case AV_PIX_FMT_PAL8:
        pal = (uint32_t *)p->data[1];
        break;
    case AV_PIX_FMT_MONOBLACK:
        pal = monoblack_pal;
        break;
    }
    if (pal && !pal_entries) pal_entries = 1 << bit_count;
    n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL;
    pad_bytes_per_row = (4 - n_bytes_per_row) & 3;
    n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row);

    // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
    // and related pages.
#define SIZE_BITMAPFILEHEADER 14
#define SIZE_BITMAPINFOHEADER 40
    hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2);
    n_bytes = n_bytes_image + hsize;
    if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes)) < 0)
        return ret;
    buf = pkt->data;
    bytestream_put_byte(&buf, 'B');                   // BITMAPFILEHEADER.bfType
    bytestream_put_byte(&buf, 'M');                   // do.
    bytestream_put_le32(&buf, n_bytes);               // BITMAPFILEHEADER.bfSize
    bytestream_put_le16(&buf, 0);                     // BITMAPFILEHEADER.bfReserved1
    bytestream_put_le16(&buf, 0);                     // BITMAPFILEHEADER.bfReserved2
    bytestream_put_le32(&buf, hsize);                 // BITMAPFILEHEADER.bfOffBits
    bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
    bytestream_put_le32(&buf, avctx->width);          // BITMAPINFOHEADER.biWidth
    bytestream_put_le32(&buf, avctx->height);         // BITMAPINFOHEADER.biHeight
    bytestream_put_le16(&buf, 1);                     // BITMAPINFOHEADER.biPlanes
    bytestream_put_le16(&buf, bit_count);             // BITMAPINFOHEADER.biBitCount
    bytestream_put_le32(&buf, compression);           // BITMAPINFOHEADER.biCompression
    bytestream_put_le32(&buf, n_bytes_image);         // BITMAPINFOHEADER.biSizeImage
    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biXPelsPerMeter
    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biYPelsPerMeter
    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biClrUsed
    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biClrImportant
    for (i = 0; i < pal_entries; i++)
        bytestream_put_le32(&buf, pal[i] & 0xFFFFFF);
    // BMP files are bottom-to-top so we start from the end...
    ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
    buf = pkt->data + hsize;
    for(i = 0; i < avctx->height; i++) {
        if (bit_count == 16) {
            const uint16_t *src = (const uint16_t *) ptr;
            uint16_t *dst = (uint16_t *) buf;
            for(n = 0; n < avctx->width; n++)
                AV_WL16(dst + n, src[n]);
        } else {
            memcpy(buf, ptr, n_bytes_per_row);
        }
        buf += n_bytes_per_row;
        memset(buf, 0, pad_bytes_per_row);
        buf += pad_bytes_per_row;
        ptr -= p->linesize[0]; // ... and go back
    }

    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;
    return 0;
}

static av_cold int bmp_encode_close(AVCodecContext *avctx)
{
    av_frame_free(&avctx->coded_frame);
    return 0;
}

AVCodec ff_bmp_encoder = {
    .name           = "bmp",
    .long_name      = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_BMP,
    .init           = bmp_encode_init,
    .encode2        = bmp_encode_frame,
    .close          = bmp_encode_close,
    .pix_fmts       = (const enum AVPixelFormat[]){
        AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24,
        AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444,
        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,
        AV_PIX_FMT_MONOBLACK,
        AV_PIX_FMT_NONE
    },
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* BMP image format encoder
	3	* Copyright (c) 2006, 2007 Michel Bardiaux
	4	* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
	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	avctx->coded_frame = av_frame_alloc();
	64	if (!avctx->coded_frame)
65	return AVERROR(ENOMEM);
66
67	return 0;
68	}
69
70	static int bmp_encode_frame(AVCodecContext avctx, AVPacket pkt,
71	const AVFrame pict, int got_packet)
72	{
73	const AVFrame * const p = pict;
74	int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret;
75	const uint32_t *pal = NULL;
76	uint32_t palette256[256];
77	int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB;
78	int bit_count = avctx->bits_per_coded_sample;
79	uint8_t ptr, buf;
80
81	avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
82	avctx->coded_frame->key_frame = 1;
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)
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	static av_cold int bmp_encode_close(AVCodecContext *avctx)
167	{
168	av_frame_free(&avctx->coded_frame);
169	return 0;
170	}
171
172	AVCodec ff_bmp_encoder = {
173	.name = "bmp",
174	.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
175	.type = AVMEDIA_TYPE_VIDEO,
176	.id = AV_CODEC_ID_BMP,
177	.init = bmp_encode_init,
178	.encode2 = bmp_encode_frame,
179	.close = bmp_encode_close,
180	.pix_fmts = (const enum AVPixelFormat[]){
181	AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24,
182	AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444,
183	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,
184	AV_PIX_FMT_MONOBLACK,
185	AV_PIX_FMT_NONE
186	},
187	};