0,0 → 1,610 |
/* |
* Ut Video encoder |
* Copyright (c) 2012 Jan Ekström |
* |
* 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 |
*/ |
|
/** |
* @file |
* Ut Video encoder |
*/ |
|
#include "libavutil/imgutils.h" |
#include "libavutil/intreadwrite.h" |
#include "avcodec.h" |
#include "internal.h" |
#include "bytestream.h" |
#include "put_bits.h" |
#include "dsputil.h" |
#include "mathops.h" |
#include "utvideo.h" |
#include "huffman.h" |
|
/* Compare huffentry symbols */ |
static int huff_cmp_sym(const void *a, const void *b) |
{ |
const HuffEntry *aa = a, *bb = b; |
return aa->sym - bb->sym; |
} |
|
static av_cold int utvideo_encode_close(AVCodecContext *avctx) |
{ |
UtvideoContext *c = avctx->priv_data; |
int i; |
|
av_freep(&avctx->coded_frame); |
av_freep(&c->slice_bits); |
for (i = 0; i < 4; i++) |
av_freep(&c->slice_buffer[i]); |
|
return 0; |
} |
|
static av_cold int utvideo_encode_init(AVCodecContext *avctx) |
{ |
UtvideoContext *c = avctx->priv_data; |
int i; |
uint32_t original_format; |
|
c->avctx = avctx; |
c->frame_info_size = 4; |
c->slice_stride = FFALIGN(avctx->width, 32); |
|
switch (avctx->pix_fmt) { |
case AV_PIX_FMT_RGB24: |
c->planes = 3; |
avctx->codec_tag = MKTAG('U', 'L', 'R', 'G'); |
original_format = UTVIDEO_RGB; |
break; |
case AV_PIX_FMT_RGBA: |
c->planes = 4; |
avctx->codec_tag = MKTAG('U', 'L', 'R', 'A'); |
original_format = UTVIDEO_RGBA; |
break; |
case AV_PIX_FMT_YUV420P: |
if (avctx->width & 1 || avctx->height & 1) { |
av_log(avctx, AV_LOG_ERROR, |
"4:2:0 video requires even width and height.\n"); |
return AVERROR_INVALIDDATA; |
} |
c->planes = 3; |
avctx->codec_tag = MKTAG('U', 'L', 'Y', '0'); |
original_format = UTVIDEO_420; |
break; |
case AV_PIX_FMT_YUV422P: |
if (avctx->width & 1) { |
av_log(avctx, AV_LOG_ERROR, |
"4:2:2 video requires even width.\n"); |
return AVERROR_INVALIDDATA; |
} |
c->planes = 3; |
avctx->codec_tag = MKTAG('U', 'L', 'Y', '2'); |
original_format = UTVIDEO_422; |
break; |
default: |
av_log(avctx, AV_LOG_ERROR, "Unknown pixel format: %d\n", |
avctx->pix_fmt); |
return AVERROR_INVALIDDATA; |
} |
|
ff_dsputil_init(&c->dsp, avctx); |
|
/* Check the prediction method, and error out if unsupported */ |
if (avctx->prediction_method < 0 || avctx->prediction_method > 4) { |
av_log(avctx, AV_LOG_WARNING, |
"Prediction method %d is not supported in Ut Video.\n", |
avctx->prediction_method); |
return AVERROR_OPTION_NOT_FOUND; |
} |
|
if (avctx->prediction_method == FF_PRED_PLANE) { |
av_log(avctx, AV_LOG_ERROR, |
"Plane prediction is not supported in Ut Video.\n"); |
return AVERROR_OPTION_NOT_FOUND; |
} |
|
/* Convert from libavcodec prediction type to Ut Video's */ |
c->frame_pred = ff_ut_pred_order[avctx->prediction_method]; |
|
if (c->frame_pred == PRED_GRADIENT) { |
av_log(avctx, AV_LOG_ERROR, "Gradient prediction is not supported.\n"); |
return AVERROR_OPTION_NOT_FOUND; |
} |
|
avctx->coded_frame = avcodec_alloc_frame(); |
|
if (!avctx->coded_frame) { |
av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n"); |
utvideo_encode_close(avctx); |
return AVERROR(ENOMEM); |
} |
|
/* extradata size is 4 * 32bit */ |
avctx->extradata_size = 16; |
|
avctx->extradata = av_mallocz(avctx->extradata_size + |
FF_INPUT_BUFFER_PADDING_SIZE); |
|
if (!avctx->extradata) { |
av_log(avctx, AV_LOG_ERROR, "Could not allocate extradata.\n"); |
utvideo_encode_close(avctx); |
return AVERROR(ENOMEM); |
} |
|
for (i = 0; i < c->planes; i++) { |
c->slice_buffer[i] = av_malloc(c->slice_stride * (avctx->height + 2) + |
FF_INPUT_BUFFER_PADDING_SIZE); |
if (!c->slice_buffer[i]) { |
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 1.\n"); |
utvideo_encode_close(avctx); |
return AVERROR(ENOMEM); |
} |
} |
|
/* |
* Set the version of the encoder. |
* Last byte is "implementation ID", which is |
* obtained from the creator of the format. |
* Libavcodec has been assigned with the ID 0xF0. |
*/ |
AV_WB32(avctx->extradata, MKTAG(1, 0, 0, 0xF0)); |
|
/* |
* Set the "original format" |
* Not used for anything during decoding. |
*/ |
AV_WL32(avctx->extradata + 4, original_format); |
|
/* Write 4 as the 'frame info size' */ |
AV_WL32(avctx->extradata + 8, c->frame_info_size); |
|
/* |
* Set how many slices are going to be used. |
* Set one slice for now. |
*/ |
c->slices = 1; |
|
/* Set compression mode */ |
c->compression = COMP_HUFF; |
|
/* |
* Set the encoding flags: |
* - Slice count minus 1 |
* - Interlaced encoding mode flag, set to zero for now. |
* - Compression mode (none/huff) |
* And write the flags. |
*/ |
c->flags = (c->slices - 1) << 24; |
c->flags |= 0 << 11; // bit field to signal interlaced encoding mode |
c->flags |= c->compression; |
|
AV_WL32(avctx->extradata + 12, c->flags); |
|
return 0; |
} |
|
static void mangle_rgb_planes(uint8_t *dst[4], int dst_stride, uint8_t *src, |
int step, int stride, int width, int height) |
{ |
int i, j; |
int k = 2 * dst_stride; |
unsigned int g; |
|
for (j = 0; j < height; j++) { |
if (step == 3) { |
for (i = 0; i < width * step; i += step) { |
g = src[i + 1]; |
dst[0][k] = g; |
g += 0x80; |
dst[1][k] = src[i + 2] - g; |
dst[2][k] = src[i + 0] - g; |
k++; |
} |
} else { |
for (i = 0; i < width * step; i += step) { |
g = src[i + 1]; |
dst[0][k] = g; |
g += 0x80; |
dst[1][k] = src[i + 2] - g; |
dst[2][k] = src[i + 0] - g; |
dst[3][k] = src[i + 3]; |
k++; |
} |
} |
k += dst_stride - width; |
src += stride; |
} |
} |
|
/* Write data to a plane with left prediction */ |
static void left_predict(uint8_t *src, uint8_t *dst, int stride, |
int width, int height) |
{ |
int i, j; |
uint8_t prev; |
|
prev = 0x80; /* Set the initial value */ |
for (j = 0; j < height; j++) { |
for (i = 0; i < width; i++) { |
*dst++ = src[i] - prev; |
prev = src[i]; |
} |
src += stride; |
} |
} |
|
/* Write data to a plane with median prediction */ |
static void median_predict(UtvideoContext *c, uint8_t *src, uint8_t *dst, int stride, |
int width, int height) |
{ |
int i, j; |
int A, B; |
uint8_t prev; |
|
/* First line uses left neighbour prediction */ |
prev = 0x80; /* Set the initial value */ |
for (i = 0; i < width; i++) { |
*dst++ = src[i] - prev; |
prev = src[i]; |
} |
|
if (height == 1) |
return; |
|
src += stride; |
|
/* |
* Second line uses top prediction for the first sample, |
* and median for the rest. |
*/ |
A = B = 0; |
|
/* Rest of the coded part uses median prediction */ |
for (j = 1; j < height; j++) { |
c->dsp.sub_hfyu_median_prediction(dst, src - stride, src, width, &A, &B); |
dst += width; |
src += stride; |
} |
} |
|
/* Count the usage of values in a plane */ |
static void count_usage(uint8_t *src, int width, |
int height, uint64_t *counts) |
{ |
int i, j; |
|
for (j = 0; j < height; j++) { |
for (i = 0; i < width; i++) { |
counts[src[i]]++; |
} |
src += width; |
} |
} |
|
/* Calculate the actual huffman codes from the code lengths */ |
static void calculate_codes(HuffEntry *he) |
{ |
int last, i; |
uint32_t code; |
|
qsort(he, 256, sizeof(*he), ff_ut_huff_cmp_len); |
|
last = 255; |
while (he[last].len == 255 && last) |
last--; |
|
code = 1; |
for (i = last; i >= 0; i--) { |
he[i].code = code >> (32 - he[i].len); |
code += 0x80000000u >> (he[i].len - 1); |
} |
|
qsort(he, 256, sizeof(*he), huff_cmp_sym); |
} |
|
/* Write huffman bit codes to a memory block */ |
static int write_huff_codes(uint8_t *src, uint8_t *dst, int dst_size, |
int width, int height, HuffEntry *he) |
{ |
PutBitContext pb; |
int i, j; |
int count; |
|
init_put_bits(&pb, dst, dst_size); |
|
/* Write the codes */ |
for (j = 0; j < height; j++) { |
for (i = 0; i < width; i++) |
put_bits(&pb, he[src[i]].len, he[src[i]].code); |
|
src += width; |
} |
|
/* Pad output to a 32bit boundary */ |
count = put_bits_count(&pb) & 0x1F; |
|
if (count) |
put_bits(&pb, 32 - count, 0); |
|
/* Get the amount of bits written */ |
count = put_bits_count(&pb); |
|
/* Flush the rest with zeroes */ |
flush_put_bits(&pb); |
|
return count; |
} |
|
static int encode_plane(AVCodecContext *avctx, uint8_t *src, |
uint8_t *dst, int stride, |
int width, int height, PutByteContext *pb) |
{ |
UtvideoContext *c = avctx->priv_data; |
uint8_t lengths[256]; |
uint64_t counts[256] = { 0 }; |
|
HuffEntry he[256]; |
|
uint32_t offset = 0, slice_len = 0; |
int i, sstart, send = 0; |
int symbol; |
|
/* Do prediction / make planes */ |
switch (c->frame_pred) { |
case PRED_NONE: |
for (i = 0; i < c->slices; i++) { |
sstart = send; |
send = height * (i + 1) / c->slices; |
av_image_copy_plane(dst + sstart * width, width, |
src + sstart * stride, stride, |
width, send - sstart); |
} |
break; |
case PRED_LEFT: |
for (i = 0; i < c->slices; i++) { |
sstart = send; |
send = height * (i + 1) / c->slices; |
left_predict(src + sstart * stride, dst + sstart * width, |
stride, width, send - sstart); |
} |
break; |
case PRED_MEDIAN: |
for (i = 0; i < c->slices; i++) { |
sstart = send; |
send = height * (i + 1) / c->slices; |
median_predict(c, src + sstart * stride, dst + sstart * width, |
stride, width, send - sstart); |
} |
break; |
default: |
av_log(avctx, AV_LOG_ERROR, "Unknown prediction mode: %d\n", |
c->frame_pred); |
return AVERROR_OPTION_NOT_FOUND; |
} |
|
/* Count the usage of values */ |
count_usage(dst, width, height, counts); |
|
/* Check for a special case where only one symbol was used */ |
for (symbol = 0; symbol < 256; symbol++) { |
/* If non-zero count is found, see if it matches width * height */ |
if (counts[symbol]) { |
/* Special case if only one symbol was used */ |
if (counts[symbol] == width * (int64_t)height) { |
/* |
* Write a zero for the single symbol |
* used in the plane, else 0xFF. |
*/ |
for (i = 0; i < 256; i++) { |
if (i == symbol) |
bytestream2_put_byte(pb, 0); |
else |
bytestream2_put_byte(pb, 0xFF); |
} |
|
/* Write zeroes for lengths */ |
for (i = 0; i < c->slices; i++) |
bytestream2_put_le32(pb, 0); |
|
/* And that's all for that plane folks */ |
return 0; |
} |
break; |
} |
} |
|
/* Calculate huffman lengths */ |
ff_huff_gen_len_table(lengths, counts); |
|
/* |
* Write the plane's header into the output packet: |
* - huffman code lengths (256 bytes) |
* - slice end offsets (gotten from the slice lengths) |
*/ |
for (i = 0; i < 256; i++) { |
bytestream2_put_byte(pb, lengths[i]); |
|
he[i].len = lengths[i]; |
he[i].sym = i; |
} |
|
/* Calculate the huffman codes themselves */ |
calculate_codes(he); |
|
send = 0; |
for (i = 0; i < c->slices; i++) { |
sstart = send; |
send = height * (i + 1) / c->slices; |
|
/* |
* Write the huffman codes to a buffer, |
* get the offset in bits and convert to bytes. |
*/ |
offset += write_huff_codes(dst + sstart * width, c->slice_bits, |
width * (send - sstart), width, |
send - sstart, he) >> 3; |
|
slice_len = offset - slice_len; |
|
/* Byteswap the written huffman codes */ |
c->dsp.bswap_buf((uint32_t *) c->slice_bits, |
(uint32_t *) c->slice_bits, |
slice_len >> 2); |
|
/* Write the offset to the stream */ |
bytestream2_put_le32(pb, offset); |
|
/* Seek to the data part of the packet */ |
bytestream2_seek_p(pb, 4 * (c->slices - i - 1) + |
offset - slice_len, SEEK_CUR); |
|
/* Write the slices' data into the output packet */ |
bytestream2_put_buffer(pb, c->slice_bits, slice_len); |
|
/* Seek back to the slice offsets */ |
bytestream2_seek_p(pb, -4 * (c->slices - i - 1) - offset, |
SEEK_CUR); |
|
slice_len = offset; |
} |
|
/* And at the end seek to the end of written slice(s) */ |
bytestream2_seek_p(pb, offset, SEEK_CUR); |
|
return 0; |
} |
|
static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
const AVFrame *pic, int *got_packet) |
{ |
UtvideoContext *c = avctx->priv_data; |
PutByteContext pb; |
|
uint32_t frame_info; |
|
uint8_t *dst; |
|
int width = avctx->width, height = avctx->height; |
int i, ret = 0; |
|
/* Allocate a new packet if needed, and set it to the pointer dst */ |
ret = ff_alloc_packet2(avctx, pkt, (256 + 4 * c->slices + width * height) * |
c->planes + 4); |
|
if (ret < 0) |
return ret; |
|
dst = pkt->data; |
|
bytestream2_init_writer(&pb, dst, pkt->size); |
|
av_fast_malloc(&c->slice_bits, &c->slice_bits_size, |
width * height + FF_INPUT_BUFFER_PADDING_SIZE); |
|
if (!c->slice_bits) { |
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 2.\n"); |
return AVERROR(ENOMEM); |
} |
|
/* In case of RGB, mangle the planes to Ut Video's format */ |
if (avctx->pix_fmt == AV_PIX_FMT_RGBA || avctx->pix_fmt == AV_PIX_FMT_RGB24) |
mangle_rgb_planes(c->slice_buffer, c->slice_stride, pic->data[0], |
c->planes, pic->linesize[0], width, height); |
|
/* Deal with the planes */ |
switch (avctx->pix_fmt) { |
case AV_PIX_FMT_RGB24: |
case AV_PIX_FMT_RGBA: |
for (i = 0; i < c->planes; i++) { |
ret = encode_plane(avctx, c->slice_buffer[i] + 2 * c->slice_stride, |
c->slice_buffer[i], c->slice_stride, |
width, height, &pb); |
|
if (ret) { |
av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i); |
return ret; |
} |
} |
break; |
case AV_PIX_FMT_YUV422P: |
for (i = 0; i < c->planes; i++) { |
ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0], |
pic->linesize[i], width >> !!i, height, &pb); |
|
if (ret) { |
av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i); |
return ret; |
} |
} |
break; |
case AV_PIX_FMT_YUV420P: |
for (i = 0; i < c->planes; i++) { |
ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0], |
pic->linesize[i], width >> !!i, height >> !!i, |
&pb); |
|
if (ret) { |
av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i); |
return ret; |
} |
} |
break; |
default: |
av_log(avctx, AV_LOG_ERROR, "Unknown pixel format: %d\n", |
avctx->pix_fmt); |
return AVERROR_INVALIDDATA; |
} |
|
/* |
* Write frame information (LE 32bit unsigned) |
* into the output packet. |
* Contains the prediction method. |
*/ |
frame_info = c->frame_pred << 8; |
bytestream2_put_le32(&pb, frame_info); |
|
/* |
* At least currently Ut Video is IDR only. |
* Set flags accordingly. |
*/ |
avctx->coded_frame->key_frame = 1; |
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
|
pkt->size = bytestream2_tell_p(&pb); |
pkt->flags |= AV_PKT_FLAG_KEY; |
|
/* Packet should be done */ |
*got_packet = 1; |
|
return 0; |
} |
|
AVCodec ff_utvideo_encoder = { |
.name = "utvideo", |
.long_name = NULL_IF_CONFIG_SMALL("Ut Video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_UTVIDEO, |
.priv_data_size = sizeof(UtvideoContext), |
.init = utvideo_encode_init, |
.encode2 = utvideo_encode_frame, |
.close = utvideo_encode_close, |
.pix_fmts = (const enum AVPixelFormat[]) { |
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA, AV_PIX_FMT_YUV422P, |
AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE |
}, |
}; |