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