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FFmpeg/libavcodec/libschroedingerenc.c
Anuradha Suraparaju 9fc88d7e20 Fix crash when encoding using libschroedinger. 
Currently only pixel and half-pixel motion vector precisions are supported in
libschroedinger. Setting the mv_precision field to 2 (i.e. quarter pixel)
causes a crash in the libschroedinger encoder calls. By not setting this
parameter, we fall back to the default value used in libschroedinger.
patch by Anuradha Suraparaju, anuradha rd.bbc.co uk

Originally committed as revision 17132 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-02-10 14:27:16 +00:00

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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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