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007f67b012
patch by Anuradha Suraparaju, anuradha rd.bbc.co uk Originally committed as revision 14192 to svn://svn.ffmpeg.org/ffmpeg/trunk
434 lines
15 KiB
C
434 lines
15 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 libschroedingerenc.c
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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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#undef NDEBUG
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#include <assert.h>
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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 "avcodec.h"
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#include "libdirac_libschro.h"
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#include "libschroedinger.h"
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/** libschroedinger encoder private data */
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typedef struct FfmpegSchroEncoderParams
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{
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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 being encoded */
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AVFrame picture;
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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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FfmpegDiracSchroQueue 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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} FfmpegSchroEncoderParams;
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/**
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* Works out Schro-compatible chroma format.
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*/
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static int SetSchroChromaFormat(AVCodecContext *avccontext)
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{
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int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
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sizeof(ffmpeg_schro_pixel_format_map[0]);
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int idx;
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FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
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for (idx = 0; idx < num_formats; ++idx) {
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if (ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt ==
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avccontext->pix_fmt) {
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p_schro_params->format->chroma_format =
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ffmpeg_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 (avccontext, 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 int libschroedinger_encode_init(AVCodecContext *avccontext)
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{
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FfmpegSchroEncoderParams* p_schro_params = avccontext->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(avccontext, 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(avccontext);
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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 = avccontext->width;
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p_schro_params->format->height = avccontext->height;
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if (SetSchroChromaFormat(avccontext) == -1)
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return -1;
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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 (avccontext, 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 = avccontext->time_base.den;
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p_schro_params->format->frame_rate_denominator = avccontext->time_base.num;
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p_schro_params->frame_size = avpicture_get_size(avccontext->pix_fmt,
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avccontext->width,
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avccontext->height);
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avccontext->coded_frame = &p_schro_params->picture;
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if (avccontext->gop_size == 0){
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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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}
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else {
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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_BIREF);
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avccontext->has_b_frames = 1;
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}
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/* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */
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if (avccontext->flags & CODEC_FLAG_QSCALE) {
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if (avccontext->global_quality == 0) {
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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 noise_threshold;
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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_NOISE_THRESHOLD);
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noise_threshold = avccontext->global_quality/FF_QP2LAMBDA;
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if (noise_threshold > 100)
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noise_threshold = 100;
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schro_encoder_setting_set_double (p_schro_params->encoder,
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"noise_threshold",
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noise_threshold);
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}
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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",
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avccontext->bit_rate);
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}
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if (avccontext->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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}
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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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/* Hardcode motion vector precision to quarter pixel. */
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schro_encoder_setting_set_double (p_schro_params->encoder,
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"mv_precision", 2);
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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 (avccontext->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_dirac_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 *avccontext,
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void *in_data)
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{
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FfmpegSchroEncoderParams* p_schro_params = avccontext->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 = schro_frame_new_and_alloc (NULL,
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p_schro_params->frame_format,
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p_schro_params->format->width,
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p_schro_params->format->height);
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avpicture_layout ((AVPicture *)in_data, avccontext->pix_fmt,
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avccontext->width, avccontext->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 SchroedingerFreeFrame(void *data)
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{
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FfmpegDiracSchroEncodedFrame *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 *avccontext,
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unsigned char *frame,
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int buf_size, void *data)
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{
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int enc_size = 0;
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FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
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SchroEncoder *encoder = p_schro_params->encoder;
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struct FfmpegDiracSchroEncodedFrame* 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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if(data == NULL) {
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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 (avccontext,
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data);
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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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SchroStateEnum state;
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state = schro_encoder_wait(encoder);
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switch (state)
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{
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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,
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&presentation_frame);
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assert (enc_buf->length > 0);
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assert (enc_buf->length <= buf_size);
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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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p_schro_params->enc_buf = av_realloc (
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p_schro_params->enc_buf,
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p_schro_params->enc_buf_size + enc_buf->length
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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(FfmpegDiracSchroEncodedFrame));
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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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}
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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 = (enc_buf->data[13] << 24) +
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(enc_buf->data[14] << 16) +
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(enc_buf->data[15] << 8) +
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enc_buf->data[16];
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ff_dirac_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(avccontext, 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 =
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ff_dirac_schro_queue_pop (&p_schro_params->enc_frame_queue);
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if (p_frame_output == NULL)
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return 0;
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memcpy(frame, p_frame_output->p_encbuf, p_frame_output->size);
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avccontext->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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avccontext->coded_frame->pts = p_frame_output->frame_num;
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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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{
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memcpy (frame + 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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/* free frame */
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SchroedingerFreeFrame (p_frame_output);
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return enc_size;
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}
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static int libschroedinger_encode_close(AVCodecContext *avccontext)
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{
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FfmpegSchroEncoderParams* p_schro_params = avccontext->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_dirac_schro_queue_free (&p_schro_params->enc_frame_queue,
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SchroedingerFreeFrame);
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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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return 0 ;
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}
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AVCodec libschroedinger_encoder = {
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"libschroedinger",
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CODEC_TYPE_VIDEO,
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CODEC_ID_DIRAC,
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sizeof(FfmpegSchroEncoderParams),
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libschroedinger_encode_init,
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libschroedinger_encode_frame,
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libschroedinger_encode_close,
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.capabilities= CODEC_CAP_DELAY,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
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.long_name= NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
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};
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