mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/bmpenc: Avoid copying packet data, allow user-supplied buffers
When the packet size is known in advance like here, one can avoid an intermediate buffer for the packet data; this also makes it easy to allow user-supplied buffers. Only one thing needed to be changed: One can no longer use a pointer to uint16_t for the destination buffer because its alignment is unknown. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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@ -25,6 +25,7 @@
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#include "avcodec.h"
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#include "bytestream.h"
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#include "bmp.h"
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#include "encode.h"
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#include "internal.h"
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static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
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@ -112,7 +113,7 @@ static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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#define SIZE_BITMAPINFOHEADER 40
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hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2);
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n_bytes = n_bytes_image + hsize;
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if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes, 0)) < 0)
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if ((ret = ff_get_encode_buffer(avctx, pkt, n_bytes, 0)) < 0)
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return ret;
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buf = pkt->data;
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bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType
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@ -140,9 +141,8 @@ static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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for(i = 0; i < avctx->height; i++) {
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if (bit_count == 16) {
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const uint16_t *src = (const uint16_t *) ptr;
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uint16_t *dst = (uint16_t *) buf;
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for(n = 0; n < avctx->width; n++)
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AV_WL16(dst + n, src[n]);
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AV_WL16(buf + 2 * n, src[n]);
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} else {
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memcpy(buf, ptr, n_bytes_per_row);
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}
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@ -162,6 +162,7 @@ const AVCodec ff_bmp_encoder = {
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.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_BMP,
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.capabilities = AV_CODEC_CAP_DR1,
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.init = bmp_encode_init,
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.encode2 = bmp_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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