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Code Issues Releases Activity

avcodec/ljpegenc: Fix encoding RGBA LJPEG

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-11 13:28:16 +02:00
parent 055e56e9f7
commit 8b72f6d50b
3 changed files with 35 additions and 16 deletions
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21
libavcodec/ljpegenc.c
View File

@ -48,8 +48,8 @@ typedef struct LJpegEncContext {
ScanTable scantable;
uint16_t matrix[64];
int vsample[3];
int hsample[3];
int vsample[4];
int hsample[4];
uint16_t huff_code_dc_luminance[12];
uint16_t huff_code_dc_chrominance[12];
@ -68,22 +68,22 @@ static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
const int linesize = frame->linesize[0];
uint16_t (*buffer)[4] = s->scratch;
const int predictor = avctx->prediction_method+1;
int left[3], top[3], topleft[3];
int left[4], top[4], topleft[4];
int x, y, i;
for (i = 0; i < 3; i++)
for (i = 0; i < 4; i++)
buffer[0][i] = 1 << (9 - 1);
for (y = 0; y < height; y++) {
const int modified_predictor = y ? predictor : 1;
uint8_t *ptr = frame->data[0] + (linesize * y);
if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 4) {
if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 4 * 4) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for (i = 0; i < 3; i++)
for (i = 0; i < 4; i++)
top[i]= left[i]= topleft[i]= buffer[0][i];
for (x = 0; x < width; x++) {
@ -95,9 +95,11 @@ static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
buffer[x][3] = ptr[4 * x + 3];
}
for (i = 0; i < 3; i++) {
for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
int pred, diff;
PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
@ -109,7 +111,7 @@ static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
if (i == 0)
if (i == 0 || i == 3)
ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
@ -221,9 +223,10 @@ static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
int ret, header_bits;
if( avctx->pix_fmt == AV_PIX_FMT_BGR0
|| avctx->pix_fmt == AV_PIX_FMT_BGRA
|| avctx->pix_fmt == AV_PIX_FMT_BGR24)
max_pkt_size += width * height * 3 * 4;
else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
max_pkt_size += width * height * 4 * 4;
else {
max_pkt_size += mb_width * mb_height * 3 * 4
* s->hsample[0] * s->vsample[0];

28
libavcodec/mjpegenc_common.c
View File

@ -159,7 +159,7 @@ static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
}
}
void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3])
void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4])
{
int chroma_h_shift, chroma_v_shift;
@ -171,7 +171,8 @@ void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3
|| avctx->pix_fmt == AV_PIX_FMT_BGR24)) {
vsample[0] = hsample[0] =
vsample[1] = hsample[1] =
vsample[2] = hsample[2] = 1;
vsample[2] = hsample[2] =
vsample[3] = hsample[3] = 1;
} else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
vsample[0] = vsample[1] = vsample[2] = 2;
hsample[0] = hsample[1] = hsample[2] = 1;
@ -191,8 +192,9 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
uint16_t chroma_intra_matrix[64])
{
const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
int hsample[3], vsample[3];
int hsample[4], vsample[4];
int i;
int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA);
int chroma_matrix = !!memcmp(luma_intra_matrix,
chroma_intra_matrix,
sizeof(luma_intra_matrix[0])*64);
@ -223,7 +225,7 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
put_bits(pb, 8, 8); /* 8 bits/component */
put_bits(pb, 16, avctx->height);
put_bits(pb, 16, avctx->width);
put_bits(pb, 8, 3); /* 3 components */
put_bits(pb, 8, components); /* 3 or 4 components */
/* Y component */
put_bits(pb, 8, 1); /* component number */
@ -243,10 +245,17 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
put_bits(pb, 4, vsample[2]); /* V factor */
put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
if (components == 4) {
put_bits(pb, 8, 4); /* component number */
put_bits(pb, 4, hsample[3]); /* H factor */
put_bits(pb, 4, vsample[3]); /* V factor */
put_bits(pb, 8, 0); /* select matrix */
}
/* scan header */
put_marker(pb, SOS);
put_bits(pb, 16, 12); /* length */
put_bits(pb, 8, 3); /* 3 components */
put_bits(pb, 16, 6 + 2*components); /* length */
put_bits(pb, 8, components); /* 3 components */
/* Y component */
put_bits(pb, 8, 1); /* index */
@ -263,6 +272,13 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
put_bits(pb, 4, 1); /* DC huffman table index */
put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
if (components == 4) {
/* Alpha component */
put_bits(pb, 8, 4); /* index */
put_bits(pb, 4, 0); /* DC huffman table index */
put_bits(pb, 4, 0); /* AC huffman table index */
}
put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */
switch (avctx->codec_id) {

2
libavcodec/mjpegenc_common.h
View File

@ -35,7 +35,7 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits);
void ff_mjpeg_escape_FF(PutBitContext *pb, int start);
int ff_mjpeg_encode_stuffing(MpegEncContext *s);
void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3]);
void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4]);
void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
uint8_t *huff_size, uint16_t *huff_code);