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ffmpeg/libavcodec/libschroedingerenc.c

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/*
* Dirac encoder support via Schroedinger libraries
* Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
*
* 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 libavcodec/libschroedingerenc.c
* Dirac encoder support via libschroedinger-1.0 libraries. More details about
* the Schroedinger project can be found at http://www.diracvideo.org/.
* The library implements Dirac Specification Version 2.2
* (http://dirac.sourceforge.net/specification.html).
*/
#undef NDEBUG
#include <assert.h>
#include <schroedinger/schro.h>
#include <schroedinger/schrodebug.h>
#include <schroedinger/schrovideoformat.h>
#include "avcodec.h"
#include "libdirac_libschro.h"
#include "libschroedinger.h"
/** libschroedinger encoder private data */
typedef struct FfmpegSchroEncoderParams
{
/** Schroedinger video format */
SchroVideoFormat *format;
/** Schroedinger frame format */
SchroFrameFormat frame_format;
/** frame being encoded */
AVFrame picture;
/** frame size */
int frame_size;
/** Schroedinger encoder handle*/
SchroEncoder* encoder;
/** buffer to store encoder output before writing it to the frame queue*/
unsigned char *enc_buf;
/** Size of encoder buffer*/
int enc_buf_size;
/** queue storing encoded frames */
FfmpegDiracSchroQueue enc_frame_queue;
/** end of sequence signalled */
int eos_signalled;
/** end of sequence pulled */
int eos_pulled;
} FfmpegSchroEncoderParams;
/**
* Works out Schro-compatible chroma format.
*/
static int SetSchroChromaFormat(AVCodecContext *avccontext)
{
int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
sizeof(ffmpeg_schro_pixel_format_map[0]);
int idx;
FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
for (idx = 0; idx < num_formats; ++idx) {
if (ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt ==
avccontext->pix_fmt) {
p_schro_params->format->chroma_format =
ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt;
return 0;
}
}
av_log (avccontext, AV_LOG_ERROR,
"This codec currently only supports planar YUV 4:2:0, 4:2:2"
" and 4:4:4 formats.\n");
return -1;
}
static int libschroedinger_encode_init(AVCodecContext *avccontext)
{
FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
SchroVideoFormatEnum preset;
/* Initialize the libraries that libschroedinger depends on. */
schro_init();
/* Create an encoder object. */
p_schro_params->encoder = schro_encoder_new();
if (!p_schro_params->encoder) {
av_log(avccontext, AV_LOG_ERROR,
"Unrecoverable Error: schro_encoder_new failed. ");
return -1;
}
/* Initialize the format. */
preset = ff_get_schro_video_format_preset(avccontext);
p_schro_params->format =
schro_encoder_get_video_format(p_schro_params->encoder);
schro_video_format_set_std_video_format (p_schro_params->format, preset);
p_schro_params->format->width = avccontext->width;
p_schro_params->format->height = avccontext->height;
if (SetSchroChromaFormat(avccontext) == -1)
return -1;
if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
&p_schro_params->frame_format) == -1) {
av_log (avccontext, AV_LOG_ERROR,
"This codec currently supports only planar YUV 4:2:0, 4:2:2"
" and 4:4:4 formats.\n");
return -1;
}
p_schro_params->format->frame_rate_numerator = avccontext->time_base.den;
p_schro_params->format->frame_rate_denominator = avccontext->time_base.num;
p_schro_params->frame_size = avpicture_get_size(avccontext->pix_fmt,
avccontext->width,
avccontext->height);
avccontext->coded_frame = &p_schro_params->picture;
if (avccontext->gop_size == 0){
schro_encoder_setting_set_double (p_schro_params->encoder,
"gop_structure",
SCHRO_ENCODER_GOP_INTRA_ONLY);
if (avccontext->coder_type == FF_CODER_TYPE_VLC) {
schro_encoder_setting_set_double (p_schro_params->encoder,
"enable_noarith", 1);
}
}
else {
schro_encoder_setting_set_double (p_schro_params->encoder,
"gop_structure",
SCHRO_ENCODER_GOP_BIREF);
avccontext->has_b_frames = 1;
}
/* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */
if (avccontext->flags & CODEC_FLAG_QSCALE) {
if (avccontext->global_quality == 0) {
/* lossless coding */
schro_encoder_setting_set_double (p_schro_params->encoder,
"rate_control",
SCHRO_ENCODER_RATE_CONTROL_LOSSLESS);
} else {
int noise_threshold;
schro_encoder_setting_set_double (p_schro_params->encoder,
"rate_control",
SCHRO_ENCODER_RATE_CONTROL_CONSTANT_NOISE_THRESHOLD);
noise_threshold = avccontext->global_quality/FF_QP2LAMBDA;
if (noise_threshold > 100)
noise_threshold = 100;
schro_encoder_setting_set_double (p_schro_params->encoder,
"noise_threshold",
noise_threshold);
}
}
else {
schro_encoder_setting_set_double ( p_schro_params->encoder,
"rate_control",
SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE);
schro_encoder_setting_set_double (p_schro_params->encoder,
"bitrate",
avccontext->bit_rate);
}
if (avccontext->flags & CODEC_FLAG_INTERLACED_ME) {
/* All material can be coded as interlaced or progressive
irrespective of the type of source material. */
schro_encoder_setting_set_double (p_schro_params->encoder,
"interlaced_coding", 1);
}
/* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger
* and libdirac support other bit-depth data. */
schro_video_format_set_std_signal_range(p_schro_params->format,
SCHRO_SIGNAL_RANGE_8BIT_VIDEO);
/* Set the encoder format. */
schro_encoder_set_video_format(p_schro_params->encoder,
p_schro_params->format);
/* Set the debug level. */
schro_debug_set_level (avccontext->debug);
schro_encoder_start (p_schro_params->encoder);
/* Initialize the encoded frame queue. */
ff_dirac_schro_queue_init (&p_schro_params->enc_frame_queue);
return 0 ;
}
static SchroFrame *libschroedinger_frame_from_data (AVCodecContext *avccontext,
void *in_data)
{
FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
SchroFrame *in_frame;
/* Input line size may differ from what the codec supports. Especially
* when transcoding from one format to another. So use avpicture_layout
* to copy the frame. */
in_frame = schro_frame_new_and_alloc (NULL,
p_schro_params->frame_format,
p_schro_params->format->width,
p_schro_params->format->height);
avpicture_layout ((AVPicture *)in_data, avccontext->pix_fmt,
avccontext->width, avccontext->height,
in_frame->components[0].data,
p_schro_params->frame_size);
return in_frame;
}
static void SchroedingerFreeFrame(void *data)
{
FfmpegDiracSchroEncodedFrame *enc_frame = data;
av_freep (&(enc_frame->p_encbuf));
av_free(enc_frame);
}
static int libschroedinger_encode_frame(AVCodecContext *avccontext,
unsigned char *frame,
int buf_size, void *data)
{
int enc_size = 0;
FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
SchroEncoder *encoder = p_schro_params->encoder;
struct FfmpegDiracSchroEncodedFrame* p_frame_output = NULL;
int go = 1;
SchroBuffer *enc_buf;
int presentation_frame;
int parse_code;
int last_frame_in_sequence = 0;
if(data == NULL) {
/* Push end of sequence if not already signalled. */
if (!p_schro_params->eos_signalled) {
schro_encoder_end_of_stream(encoder);
p_schro_params->eos_signalled = 1;
}
} else {
/* Allocate frame data to schro input buffer. */
SchroFrame *in_frame = libschroedinger_frame_from_data (avccontext,
data);
/* Load next frame. */
schro_encoder_push_frame(encoder, in_frame);
}
if (p_schro_params->eos_pulled)
go = 0;
/* Now check to see if we have any output from the encoder. */
while (go) {
SchroStateEnum state;
state = schro_encoder_wait(encoder);
switch (state)
{
case SCHRO_STATE_HAVE_BUFFER:
case SCHRO_STATE_END_OF_STREAM:
enc_buf = schro_encoder_pull (encoder,
&presentation_frame);
assert (enc_buf->length > 0);
assert (enc_buf->length <= buf_size);
parse_code = enc_buf->data[4];
/* All non-frame data is prepended to actual frame data to
* be able to set the pts correctly. So we don't write data
* to the frame output queue until we actually have a frame
*/
p_schro_params->enc_buf = av_realloc (
p_schro_params->enc_buf,
p_schro_params->enc_buf_size + enc_buf->length
);
memcpy(p_schro_params->enc_buf+p_schro_params->enc_buf_size,
enc_buf->data, enc_buf->length);
p_schro_params->enc_buf_size += enc_buf->length;
if (state == SCHRO_STATE_END_OF_STREAM) {
p_schro_params->eos_pulled = 1;
go = 0;
}
if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) {
schro_buffer_unref (enc_buf);
break;
}
/* Create output frame. */
p_frame_output = av_mallocz(sizeof(FfmpegDiracSchroEncodedFrame));
/* Set output data. */
p_frame_output->size = p_schro_params->enc_buf_size;
p_frame_output->p_encbuf = p_schro_params->enc_buf;
if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) &&
SCHRO_PARSE_CODE_IS_REFERENCE(parse_code)) {
p_frame_output->key_frame = 1;
}
/* Parse the coded frame number from the bitstream. Bytes 14
* through 17 represesent the frame number. */
p_frame_output->frame_num = (enc_buf->data[13] << 24) +
(enc_buf->data[14] << 16) +
(enc_buf->data[15] << 8) +
enc_buf->data[16];
ff_dirac_schro_queue_push_back (&p_schro_params->enc_frame_queue,
p_frame_output);
p_schro_params->enc_buf_size = 0;
p_schro_params->enc_buf = NULL;
schro_buffer_unref (enc_buf);
break;
case SCHRO_STATE_NEED_FRAME:
go = 0;
break;
case SCHRO_STATE_AGAIN:
break;
default:
av_log(avccontext, AV_LOG_ERROR, "Unknown Schro Encoder state\n");
return -1;
}
}
/* Copy 'next' frame in queue. */
if (p_schro_params->enc_frame_queue.size == 1 &&
p_schro_params->eos_pulled)
last_frame_in_sequence = 1;
p_frame_output =
ff_dirac_schro_queue_pop (&p_schro_params->enc_frame_queue);
if (p_frame_output == NULL)
return 0;
memcpy(frame, p_frame_output->p_encbuf, p_frame_output->size);
avccontext->coded_frame->key_frame = p_frame_output->key_frame;
/* Use the frame number of the encoded frame as the pts. It is OK to
* do so since Dirac is a constant frame rate codec. It expects input
* to be of constant frame rate. */
avccontext->coded_frame->pts = p_frame_output->frame_num;
enc_size = p_frame_output->size;
/* Append the end of sequence information to the last frame in the
* sequence. */
if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0)
{
memcpy (frame + enc_size, p_schro_params->enc_buf,
p_schro_params->enc_buf_size);
enc_size += p_schro_params->enc_buf_size;
av_freep (&p_schro_params->enc_buf);
p_schro_params->enc_buf_size = 0;
}
/* free frame */
SchroedingerFreeFrame (p_frame_output);
return enc_size;
}
static int libschroedinger_encode_close(AVCodecContext *avccontext)
{
FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
/* Close the encoder. */
schro_encoder_free(p_schro_params->encoder);
/* Free data in the output frame queue. */
ff_dirac_schro_queue_free (&p_schro_params->enc_frame_queue,
SchroedingerFreeFrame);
/* Free the encoder buffer. */
if (p_schro_params->enc_buf_size)
av_freep(&p_schro_params->enc_buf);
/* Free the video format structure. */
av_freep(&p_schro_params->format);
return 0 ;
}
AVCodec libschroedinger_encoder = {
"libschroedinger",
CODEC_TYPE_VIDEO,
CODEC_ID_DIRAC,
sizeof(FfmpegSchroEncoderParams),
libschroedinger_encode_init,
libschroedinger_encode_frame,
libschroedinger_encode_close,
.capabilities= CODEC_CAP_DELAY,
.pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
.long_name= NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
};
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