raw.c | 2 -
rawdec.c | 92
+++++++++++++++++++++++++++++++++++++++++----------------------
2 files changed, 62 insertions(+), 32 deletions(-)
7e3ead59067fc542c5ad6c3231ab5783bad57c0b
0001-lavc-rawdec-Use-AV_PIX_FMT_PAL8-for-1-bit-raw-AVI-vi.patch
From 0f99c5bdcf39230556eef82fa849dd6342208539 Mon Sep 17 00:00:00 2001
From: Mats Peterson <matsp...@yahoo.com>
Date: Fri, 22 Jan 2016 15:38:26 +0100
Subject: [PATCH v5] lavc/rawdec: Use AV_PIX_FMT_PAL8 for 1-bit raw AVI video,
and more
The stuff about 1-bit video not necessarily being black & white in
QuickTime goes for AVI as well. Being 1 bit per pixel only means that
the data is bi-level. The two colors can be any color. Since many
1 bpp AVI files don't have a palette following the BITMAPINFOHEADER,
I'm setting a "default" black & white palette in raw_init_decoder().
Also, the line alignment for 4 bpp and 8 bpp depths generated warning
messages. The line alignment is now 16 bytes for 1, 2, 4, and 8 bpp depth.
Mats
---
libavcodec/raw.c | 2 +-
libavcodec/rawdec.c | 92 ++++++++++++++++++++++++++++++++++-----------------
2 files changed, 62 insertions(+), 32 deletions(-)
diff --git a/libavcodec/raw.c b/libavcodec/raw.c
index 3f2cc11..3979c5c 100644
--- a/libavcodec/raw.c
+++ b/libavcodec/raw.c
@@ -242,7 +242,7 @@ unsigned int avcodec_pix_fmt_to_codec_tag(enum
AVPixelFormat fmt)
}
const PixelFormatTag avpriv_pix_fmt_bps_avi[] = {
- { AV_PIX_FMT_MONOWHITE, 1 },
+ { AV_PIX_FMT_PAL8, 1 },
{ AV_PIX_FMT_PAL8, 2 },
{ AV_PIX_FMT_PAL8, 4 },
{ AV_PIX_FMT_PAL8, 8 },
diff --git a/libavcodec/rawdec.c b/libavcodec/rawdec.c
index cb0364c..9c4e69a 100644
--- a/libavcodec/rawdec.c
+++ b/libavcodec/rawdec.c
@@ -41,7 +41,7 @@ typedef struct RawVideoContext {
AVBufferRef *palette;
int frame_size; /* size of the frame in bytes */
int flip;
- int is_1_2_4_bpp; // 1 bpp raw in mov, and 2 or 4 bpp raw in avi/mov
+ int is_1_2_4_8_bpp; // 1, 2, 4 and 8 bpp raw in avi/mov
int is_yuv2;
int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
int tff;
@@ -94,8 +94,11 @@ static av_cold int raw_init_decoder(AVCodecContext *avctx)
return AVERROR(ENOMEM);
if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
avpriv_set_systematic_pal2((uint32_t*)context->palette->data,
avctx->pix_fmt);
- else
+ else {
memset(context->palette->data, 0, AVPALETTE_SIZE);
+ if (avctx->bits_per_coded_sample == 1)
+ memset(context->palette->data, 0xff, 4);
+ }
}
if ((avctx->extradata_size >= 9 &&
@@ -153,19 +156,20 @@ static int raw_decode(AVCodecContext *avctx, void *data,
int *got_frame,
RawVideoContext *context = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
+ int avpkt_stride = avpkt->size / avctx->height;
int linesize_align = 4;
int res, len;
int need_copy;
AVFrame *frame = data;
- if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2
- || avctx->bits_per_coded_sample == 1) &&
+ if ((avctx->bits_per_coded_sample == 8 || avctx->bits_per_coded_sample == 4
+ || avctx->bits_per_coded_sample == 2 || avctx->bits_per_coded_sample == 1)
&&
avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
- context->is_1_2_4_bpp = 1;
+ context->is_1_2_4_8_bpp = 1;
context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
- FFALIGN(avctx->width,
32),
+ FFALIGN(avctx->width,
16),
avctx->height, 1);
} else {
context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 &&
avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
@@ -175,7 +179,7 @@ static int raw_decode(AVCodecContext *avctx, void *data,
int *got_frame,
if (context->frame_size < 0)
return context->frame_size;
- need_copy = !avpkt->buf || context->is_1_2_4_bpp || context->is_yuv2 ||
context->is_lt_16bpp;
+ need_copy = !avpkt->buf || context->is_1_2_4_8_bpp || context->is_yuv2 ||
context->is_lt_16bpp;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
@@ -202,39 +206,65 @@ static int raw_decode(AVCodecContext *avctx, void *data,
int *got_frame,
if (!frame->buf[0])
return AVERROR(ENOMEM);
- // 1 bpp raw in mov, and 2 or 4 bpp raw in avi/mov
- if (context->is_1_2_4_bpp) {
- int i;
+ // 1, 2, 4 and 8 bpp raw in avi/mov
+ if (context->is_1_2_4_8_bpp) {
+ int i, j, row_pix = 0;
uint8_t *dst = frame->buf[0]->data;
buf_size = context->frame_size - AVPALETTE_SIZE;
- if (avctx->bits_per_coded_sample == 4) {
- for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) {
- dst[2 * i + 0] = buf[i] >> 4;
- dst[2 * i + 1] = buf[i] & 15;
+ if (avctx->bits_per_coded_sample == 8) {
+ for (i = 0, j = 0; j < buf_size && i<avpkt->size; i++, j++) {
+ dst[j] = buf[i];
+ row_pix++;
+ if (row_pix == avctx->width) {
+ i += avpkt_stride - (i % avpkt_stride) - 1;
+ j += 16 - (j % 16) - 1;
+ row_pix = 0;
+ }
+ }
+ } else if (avctx->bits_per_coded_sample == 4) {
+ for (i = 0, j = 0; 2 * j + 1 < buf_size && i<avpkt->size; i++,
j++) {
+ dst[2 * j + 0] = buf[i] >> 4;
+ dst[2 * j + 1] = buf[i] & 15;
+ row_pix += 2;
+ if (row_pix >= avctx->width) {
+ i += avpkt_stride - (i % avpkt_stride) - 1;
+ j += 8 - (j % 8) - 1;
+ row_pix = 0;
+ }
}
- linesize_align = 8;
