Browse code
avcodec: add bmp parser
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Paul B Mahol authored on 2012/08/06 08:46:41Showing 5 changed files
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@@ -718,6 +718,7 @@ OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o \ |
| 718 | 718 |
OBJS-$(CONFIG_AC3_PARSER) += ac3_parser.o ac3tab.o \ |
| 719 | 719 |
aac_ac3_parser.o |
| 720 | 720 |
OBJS-$(CONFIG_ADX_PARSER) += adx_parser.o adx.o |
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+OBJS-$(CONFIG_BMP_PARSER) += bmp_parser.o |
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| 721 | 722 |
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o |
| 722 | 723 |
OBJS-$(CONFIG_COOK_PARSER) += cook_parser.o |
| 723 | 724 |
OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o dca.o |
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@@ -456,6 +456,7 @@ void avcodec_register_all(void) |
| 456 | 456 |
REGISTER_PARSER (AAC_LATM, aac_latm); |
| 457 | 457 |
REGISTER_PARSER (AC3, ac3); |
| 458 | 458 |
REGISTER_PARSER (ADX, adx); |
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+ REGISTER_PARSER (BMP, bmp); |
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| 459 | 460 |
REGISTER_PARSER (CAVSVIDEO, cavsvideo); |
| 460 | 461 |
REGISTER_PARSER (COOK, cook); |
| 461 | 462 |
REGISTER_PARSER (DCA, dca); |
| 462 | 463 |
new file mode 100644 |
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@@ -0,0 +1,91 @@ |
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+/* |
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+ * BMP parser |
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+ * Copyright (c) 2012 Paul B Mahol |
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+ * |
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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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+ |
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+/** |
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+ * @file |
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+ * BMP parser |
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+ */ |
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+ |
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+#include "libavutil/bswap.h" |
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+#include "parser.h" |
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+ |
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+typedef struct BMPParseContext {
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+ ParseContext pc; |
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+ uint32_t fsize; |
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+ uint32_t remaining_size; |
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+} BMPParseContext; |
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+ |
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+static int bmp_parse(AVCodecParserContext *s, 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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+ BMPParseContext *bpc = s->priv_data; |
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+ uint64_t state = bpc->pc.state64; |
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+ int next = END_NOT_FOUND; |
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+ int i = 0; |
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+ |
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+ s->pict_type = AV_PICTURE_TYPE_NONE; |
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+ |
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+ *poutbuf_size = 0; |
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+ if (buf_size == 0) |
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+ return 0; |
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+ |
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+ if (!bpc->pc.frame_start_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 >> 48) == (('B' << 8) | 'M')) {
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+ bpc->fsize = av_bswap32(state >> 16); |
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+ bpc->pc.frame_start_found = 1; |
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+ if (bpc->fsize > buf_size - i + 7) |
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+ bpc->remaining_size = bpc->fsize - buf_size + i - 7; |
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+ else |
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+ next = bpc->fsize + i - 7; |
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+ break; |
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+ } |
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+ } |
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+ bpc->pc.state64 = state; |
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+ } else {
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+ if (bpc->remaining_size) {
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+ i = FFMIN(bpc->remaining_size, buf_size); |
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+ bpc->remaining_size -= i; |
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+ if (bpc->remaining_size) |
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+ goto flush; |
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+ next = i; |
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+ } |
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+ } |
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+ |
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+flush: |
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+ if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) |
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+ return buf_size; |
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+ |
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+ bpc->pc.frame_start_found = 0; |
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+ |
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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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+ |
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+AVCodecParser ff_bmp_parser = {
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+ .codec_ids = { CODEC_ID_BMP },
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+ .priv_data_size = sizeof(BMPParseContext), |
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+ .parser_parse = bmp_parse, |
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+ .parser_close = ff_parse_close, |
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+}; |