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456 lines
16 KiB
C
456 lines
16 KiB
C
/*
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* Dirac encoder support via Schroedinger libraries
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* Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
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*
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* This file is part of Libav.
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*
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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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*
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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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*
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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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*/
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/**
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* @file
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* Dirac encoder support via libschroedinger-1.0 libraries. More details about
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* the Schroedinger project can be found at http://www.diracvideo.org/.
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* The library implements Dirac Specification Version 2.2
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* (http://dirac.sourceforge.net/specification.html).
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*/
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#include <schroedinger/schro.h>
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#include <schroedinger/schrodebug.h>
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#include <schroedinger/schrovideoformat.h>
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#include "libavutil/attributes.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "libschroedinger.h"
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#include "bytestream.h"
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/** libschroedinger encoder private data */
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typedef struct SchroEncoderParams {
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/** Schroedinger video format */
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SchroVideoFormat *format;
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/** Schroedinger frame format */
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SchroFrameFormat frame_format;
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/** frame size */
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int frame_size;
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/** Schroedinger encoder handle*/
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SchroEncoder* encoder;
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/** buffer to store encoder output before writing it to the frame queue*/
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unsigned char *enc_buf;
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/** Size of encoder buffer*/
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int enc_buf_size;
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/** queue storing encoded frames */
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FFSchroQueue enc_frame_queue;
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/** end of sequence signalled */
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int eos_signalled;
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/** end of sequence pulled */
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int eos_pulled;
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/* counter for frames submitted to encoder, used as dts */
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int64_t dts;
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} SchroEncoderParams;
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/**
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* Works out Schro-compatible chroma format.
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*/
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static int set_chroma_format(AVCodecContext *avctx)
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{
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int num_formats = sizeof(schro_pixel_format_map) /
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sizeof(schro_pixel_format_map[0]);
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int idx;
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SchroEncoderParams *p_schro_params = avctx->priv_data;
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for (idx = 0; idx < num_formats; ++idx) {
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if (schro_pixel_format_map[idx].ff_pix_fmt == avctx->pix_fmt) {
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p_schro_params->format->chroma_format =
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schro_pixel_format_map[idx].schro_pix_fmt;
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return 0;
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}
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}
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av_log(avctx, AV_LOG_ERROR,
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"This codec currently only supports planar YUV 4:2:0, 4:2:2"
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" and 4:4:4 formats.\n");
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return -1;
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}
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static av_cold int libschroedinger_encode_init(AVCodecContext *avctx)
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{
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SchroEncoderParams *p_schro_params = avctx->priv_data;
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SchroVideoFormatEnum preset;
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/* Initialize the libraries that libschroedinger depends on. */
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schro_init();
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/* Create an encoder object. */
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p_schro_params->encoder = schro_encoder_new();
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if (!p_schro_params->encoder) {
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av_log(avctx, AV_LOG_ERROR,
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"Unrecoverable Error: schro_encoder_new failed. ");
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return -1;
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}
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/* Initialize the format. */
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preset = ff_get_schro_video_format_preset(avctx);
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p_schro_params->format =
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schro_encoder_get_video_format(p_schro_params->encoder);
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schro_video_format_set_std_video_format(p_schro_params->format, preset);
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p_schro_params->format->width = avctx->width;
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p_schro_params->format->height = avctx->height;
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if (set_chroma_format(avctx) == -1)
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return -1;
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if (avctx->color_primaries == AVCOL_PRI_BT709) {
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p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_HDTV;
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} else if (avctx->color_primaries == AVCOL_PRI_BT470BG) {
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p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_625;
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} else if (avctx->color_primaries == AVCOL_PRI_SMPTE170M) {
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p_schro_params->format->colour_primaries = SCHRO_COLOUR_PRIMARY_SDTV_525;
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}
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if (avctx->colorspace == AVCOL_SPC_BT709) {
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p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_HDTV;
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} else if (avctx->colorspace == AVCOL_SPC_BT470BG) {
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p_schro_params->format->colour_matrix = SCHRO_COLOUR_MATRIX_SDTV;
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}
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if (avctx->color_trc == AVCOL_TRC_BT709) {
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p_schro_params->format->transfer_function = SCHRO_TRANSFER_CHAR_TV_GAMMA;
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}
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if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
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&p_schro_params->frame_format) == -1) {
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av_log(avctx, AV_LOG_ERROR,
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"This codec currently supports only planar YUV 4:2:0, 4:2:2"
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" and 4:4:4 formats.\n");
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return -1;
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}
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p_schro_params->format->frame_rate_numerator = avctx->time_base.den;
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p_schro_params->format->frame_rate_denominator = avctx->time_base.num;
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p_schro_params->frame_size = avpicture_get_size(avctx->pix_fmt,
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avctx->width,
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avctx->height);
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avctx->coded_frame = av_frame_alloc();
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if (!avctx->coded_frame)
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return AVERROR(ENOMEM);
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if (!avctx->gop_size) {
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"gop_structure",
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SCHRO_ENCODER_GOP_INTRA_ONLY);
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if (avctx->coder_type == FF_CODER_TYPE_VLC)
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"enable_noarith", 1);
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} else {
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"au_distance", avctx->gop_size);
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avctx->has_b_frames = 1;
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p_schro_params->dts = -1;
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}
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/* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */
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if (avctx->flags & CODEC_FLAG_QSCALE) {
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if (!avctx->global_quality) {
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/* lossless coding */
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"rate_control",
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SCHRO_ENCODER_RATE_CONTROL_LOSSLESS);
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} else {
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int quality;
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"rate_control",
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SCHRO_ENCODER_RATE_CONTROL_CONSTANT_QUALITY);
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quality = avctx->global_quality / FF_QP2LAMBDA;
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if (quality > 10)
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quality = 10;
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"quality", quality);
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}
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} else {
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"rate_control",
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SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE);
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"bitrate", avctx->bit_rate);
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}
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if (avctx->flags & CODEC_FLAG_INTERLACED_ME)
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/* All material can be coded as interlaced or progressive
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irrespective of the type of source material. */
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schro_encoder_setting_set_double(p_schro_params->encoder,
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"interlaced_coding", 1);
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schro_encoder_setting_set_double(p_schro_params->encoder, "open_gop",
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!(avctx->flags & CODEC_FLAG_CLOSED_GOP));
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/* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger
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* and libdirac support other bit-depth data. */
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schro_video_format_set_std_signal_range(p_schro_params->format,
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SCHRO_SIGNAL_RANGE_8BIT_VIDEO);
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/* Set the encoder format. */
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schro_encoder_set_video_format(p_schro_params->encoder,
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p_schro_params->format);
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/* Set the debug level. */
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schro_debug_set_level(avctx->debug);
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schro_encoder_start(p_schro_params->encoder);
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/* Initialize the encoded frame queue. */
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ff_schro_queue_init(&p_schro_params->enc_frame_queue);
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return 0;
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}
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static SchroFrame *libschroedinger_frame_from_data(AVCodecContext *avctx,
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const AVFrame *frame)
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{
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SchroEncoderParams *p_schro_params = avctx->priv_data;
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SchroFrame *in_frame;
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/* Input line size may differ from what the codec supports. Especially
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* when transcoding from one format to another. So use avpicture_layout
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* to copy the frame. */
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in_frame = ff_create_schro_frame(avctx, p_schro_params->frame_format);
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if (in_frame)
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avpicture_layout((const AVPicture *)frame, avctx->pix_fmt,
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avctx->width, avctx->height,
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in_frame->components[0].data,
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p_schro_params->frame_size);
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return in_frame;
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}
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static void libschroedinger_free_frame(void *data)
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{
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FFSchroEncodedFrame *enc_frame = data;
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av_freep(&enc_frame->p_encbuf);
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av_free(enc_frame);
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}
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static int libschroedinger_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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int enc_size = 0;
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SchroEncoderParams *p_schro_params = avctx->priv_data;
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SchroEncoder *encoder = p_schro_params->encoder;
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struct FFSchroEncodedFrame *p_frame_output = NULL;
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int go = 1;
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SchroBuffer *enc_buf;
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int presentation_frame;
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int parse_code;
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int last_frame_in_sequence = 0;
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int pkt_size, ret;
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if (!frame) {
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/* Push end of sequence if not already signalled. */
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if (!p_schro_params->eos_signalled) {
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schro_encoder_end_of_stream(encoder);
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p_schro_params->eos_signalled = 1;
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}
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} else {
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/* Allocate frame data to schro input buffer. */
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SchroFrame *in_frame = libschroedinger_frame_from_data(avctx, frame);
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/* Load next frame. */
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schro_encoder_push_frame(encoder, in_frame);
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}
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if (p_schro_params->eos_pulled)
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go = 0;
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/* Now check to see if we have any output from the encoder. */
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while (go) {
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int err;
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SchroStateEnum state;
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state = schro_encoder_wait(encoder);
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switch (state) {
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case SCHRO_STATE_HAVE_BUFFER:
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case SCHRO_STATE_END_OF_STREAM:
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enc_buf = schro_encoder_pull(encoder, &presentation_frame);
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if (enc_buf->length <= 0)
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return AVERROR_BUG;
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parse_code = enc_buf->data[4];
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/* All non-frame data is prepended to actual frame data to
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* be able to set the pts correctly. So we don't write data
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* to the frame output queue until we actually have a frame
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*/
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if ((err = av_reallocp(&p_schro_params->enc_buf,
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p_schro_params->enc_buf_size +
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enc_buf->length)) < 0) {
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p_schro_params->enc_buf_size = 0;
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return err;
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}
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memcpy(p_schro_params->enc_buf + p_schro_params->enc_buf_size,
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enc_buf->data, enc_buf->length);
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p_schro_params->enc_buf_size += enc_buf->length;
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if (state == SCHRO_STATE_END_OF_STREAM) {
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p_schro_params->eos_pulled = 1;
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go = 0;
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}
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if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) {
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schro_buffer_unref(enc_buf);
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break;
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}
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/* Create output frame. */
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p_frame_output = av_mallocz(sizeof(FFSchroEncodedFrame));
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/* Set output data. */
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p_frame_output->size = p_schro_params->enc_buf_size;
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p_frame_output->p_encbuf = p_schro_params->enc_buf;
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if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) &&
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SCHRO_PARSE_CODE_IS_REFERENCE(parse_code))
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p_frame_output->key_frame = 1;
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/* Parse the coded frame number from the bitstream. Bytes 14
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* through 17 represesent the frame number. */
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p_frame_output->frame_num = AV_RB32(enc_buf->data + 13);
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ff_schro_queue_push_back(&p_schro_params->enc_frame_queue,
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p_frame_output);
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p_schro_params->enc_buf_size = 0;
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p_schro_params->enc_buf = NULL;
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schro_buffer_unref(enc_buf);
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break;
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case SCHRO_STATE_NEED_FRAME:
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go = 0;
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break;
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case SCHRO_STATE_AGAIN:
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unknown Schro Encoder state\n");
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return -1;
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}
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}
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/* Copy 'next' frame in queue. */
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if (p_schro_params->enc_frame_queue.size == 1 &&
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p_schro_params->eos_pulled)
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last_frame_in_sequence = 1;
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p_frame_output = ff_schro_queue_pop(&p_schro_params->enc_frame_queue);
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if (!p_frame_output)
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return 0;
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pkt_size = p_frame_output->size;
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if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0)
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pkt_size += p_schro_params->enc_buf_size;
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if ((ret = ff_alloc_packet(pkt, pkt_size)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", pkt_size);
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goto error;
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}
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memcpy(pkt->data, p_frame_output->p_encbuf, p_frame_output->size);
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avctx->coded_frame->key_frame = p_frame_output->key_frame;
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/* Use the frame number of the encoded frame as the pts. It is OK to
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* do so since Dirac is a constant frame rate codec. It expects input
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* to be of constant frame rate. */
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pkt->pts =
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avctx->coded_frame->pts = p_frame_output->frame_num;
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pkt->dts = p_schro_params->dts++;
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enc_size = p_frame_output->size;
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/* Append the end of sequence information to the last frame in the
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* sequence. */
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if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0) {
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memcpy(pkt->data + enc_size, p_schro_params->enc_buf,
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p_schro_params->enc_buf_size);
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enc_size += p_schro_params->enc_buf_size;
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av_freep(&p_schro_params->enc_buf);
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p_schro_params->enc_buf_size = 0;
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}
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if (p_frame_output->key_frame)
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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error:
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/* free frame */
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libschroedinger_free_frame(p_frame_output);
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return ret;
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}
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static int libschroedinger_encode_close(AVCodecContext *avctx)
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{
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SchroEncoderParams *p_schro_params = avctx->priv_data;
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/* Close the encoder. */
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schro_encoder_free(p_schro_params->encoder);
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/* Free data in the output frame queue. */
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ff_schro_queue_free(&p_schro_params->enc_frame_queue,
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libschroedinger_free_frame);
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/* Free the encoder buffer. */
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if (p_schro_params->enc_buf_size)
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av_freep(&p_schro_params->enc_buf);
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/* Free the video format structure. */
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av_freep(&p_schro_params->format);
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av_frame_free(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_libschroedinger_encoder = {
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.name = "libschroedinger",
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.long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_DIRAC,
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.priv_data_size = sizeof(SchroEncoderParams),
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.init = libschroedinger_encode_init,
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.encode2 = libschroedinger_encode_frame,
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.close = libschroedinger_encode_close,
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.capabilities = CODEC_CAP_DELAY,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE
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},
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};
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