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* Dirac decoder support via Schroedinger libraries
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* Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
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* This file is part of FFmpeg.
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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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* 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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* 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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* Dirac decoder 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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#include "libdirac_libschro.h"
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#include "libschroedinger.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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/** libschroedinger decoder private data */
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typedef struct FfmpegSchroDecoderParams {
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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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SchroDecoder* decoder;
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/** queue storing decoded frames */
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FfmpegDiracSchroQueue dec_frame_queue;
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/** end of sequence signalled */
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/** end of sequence pulled */
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/** decoded picture */
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} FfmpegSchroDecoderParams;
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typedef struct FfmpegSchroParseUnitContext {
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} FfmpegSchroParseUnitContext;
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static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
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static void FfmpegSchroParseContextInit(FfmpegSchroParseUnitContext *parse_ctx,
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const uint8_t *buf, int buf_size)
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parse_ctx->buf_size = buf_size;
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static SchroBuffer* FfmpegFindNextSchroParseUnit(FfmpegSchroParseUnitContext *parse_ctx)
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SchroBuffer *enc_buf = NULL;
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int next_pu_offset = 0;
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unsigned char *in_buf;
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if (parse_ctx->buf_size < 13 ||
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parse_ctx->buf[0] != 'B' ||
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parse_ctx->buf[1] != 'B' ||
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parse_ctx->buf[2] != 'C' ||
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parse_ctx->buf[3] != 'D')
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next_pu_offset = (parse_ctx->buf[5] << 24) +
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(parse_ctx->buf[6] << 16) +
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(parse_ctx->buf[7] << 8) +
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if (next_pu_offset == 0 &&
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SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
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if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
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in_buf = av_malloc(next_pu_offset);
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memcpy(in_buf, parse_ctx->buf, next_pu_offset);
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enc_buf = schro_buffer_new_with_data(in_buf, next_pu_offset);
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enc_buf->free = libschroedinger_decode_buffer_free;
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enc_buf->priv = in_buf;
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parse_ctx->buf += next_pu_offset;
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parse_ctx->buf_size -= next_pu_offset;
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* Returns FFmpeg chroma format.
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static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt)
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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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for (idx = 0; idx < num_formats; ++idx)
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if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
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return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt;
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static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
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FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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/* First of all, initialize our supporting libraries. */
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schro_debug_set_level(avccontext->debug);
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p_schro_params->decoder = schro_decoder_new();
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schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
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if (!p_schro_params->decoder)
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/* Initialize the decoded frame queue. */
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ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue);
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static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
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static void libschroedinger_decode_frame_free(void *frame)
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schro_frame_unref(frame);
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static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
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FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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SchroDecoder *decoder = p_schro_params->decoder;
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p_schro_params->format = schro_decoder_get_video_format(decoder);
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/* Tell FFmpeg about sequence details. */
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if (avcodec_check_dimensions(avccontext, p_schro_params->format->width,
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p_schro_params->format->height) < 0) {
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av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
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p_schro_params->format->width, p_schro_params->format->height);
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avccontext->height = avccontext->width = 0;
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avccontext->height = p_schro_params->format->height;
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avccontext->width = p_schro_params->format->width;
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avccontext->pix_fmt = GetFfmpegChromaFormat(p_schro_params->format->chroma_format);
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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 only supports planar YUV 4:2:0, 4:2:2 "
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"and 4:4:4 formats.\n");
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avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
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avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
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if (!p_schro_params->dec_pic.data[0])
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avpicture_alloc(&p_schro_params->dec_pic,
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static int libschroedinger_decode_frame(AVCodecContext *avccontext,
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void *data, int *data_size,
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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SchroDecoder *decoder = p_schro_params->decoder;
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SchroVideoFormat *format;
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AVPicture *picture = data;
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SchroBuffer *enc_buf;
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FfmpegSchroParseUnitContext parse_ctx;
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FfmpegSchroParseContextInit(&parse_ctx, buf, buf_size);
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if (!p_schro_params->eos_signalled) {
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state = schro_decoder_push_end_of_stream(decoder);
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p_schro_params->eos_signalled = 1;
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/* Loop through all the individual parse units in the input buffer */
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if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) {
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/* Push buffer into decoder. */
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if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
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SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
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avccontext->has_b_frames = 1;
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state = schro_decoder_push(decoder, enc_buf);
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if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
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libschroedinger_handle_first_access_unit(avccontext);
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format = p_schro_params->format;
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/* Parse data and process result. */
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state = schro_decoder_wait(decoder);
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case SCHRO_DECODER_FIRST_ACCESS_UNIT:
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libschroedinger_handle_first_access_unit(avccontext);
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case SCHRO_DECODER_NEED_BITS:
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/* Need more input data - stop iterating over what we have. */
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case SCHRO_DECODER_NEED_FRAME:
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/* Decoder needs a frame - create one and push it in. */
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frame = ff_create_schro_frame(avccontext,
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p_schro_params->frame_format);
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schro_decoder_add_output_picture(decoder, frame);
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case SCHRO_DECODER_OK:
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/* Pull a frame out of the decoder. */
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frame = schro_decoder_pull(decoder);
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ff_dirac_schro_queue_push_back(&p_schro_params->dec_frame_queue,
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case SCHRO_DECODER_EOS:
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p_schro_params->eos_pulled = 1;
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schro_decoder_reset(decoder);
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case SCHRO_DECODER_ERROR:
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/* Grab next frame to be returned from the top of the queue. */
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frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);
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memcpy(p_schro_params->dec_pic.data[0],
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frame->components[0].data,
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frame->components[0].length);
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memcpy(p_schro_params->dec_pic.data[1],
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frame->components[1].data,
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frame->components[1].length);
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memcpy(p_schro_params->dec_pic.data[2],
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frame->components[2].data,
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frame->components[2].length);
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/* Fill picture with current buffer data from Schroedinger. */
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avpicture_fill(picture, p_schro_params->dec_pic.data[0],
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avccontext->width, avccontext->height);
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*data_size = sizeof(AVPicture);
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/* Now free the frame resources. */
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libschroedinger_decode_frame_free(frame);
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static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
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FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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/* Free the decoder. */
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schro_decoder_free(p_schro_params->decoder);
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av_freep(&p_schro_params->format);
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avpicture_free(&p_schro_params->dec_pic);
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/* Free data in the output frame queue. */
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ff_dirac_schro_queue_free(&p_schro_params->dec_frame_queue,
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libschroedinger_decode_frame_free);
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static void libschroedinger_flush(AVCodecContext *avccontext)
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/* Got a seek request. Free the decoded frames queue and then reset
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FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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/* Free data in the output frame queue. */
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ff_dirac_schro_queue_free(&p_schro_params->dec_frame_queue,
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libschroedinger_decode_frame_free);
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ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue);
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schro_decoder_reset(p_schro_params->decoder);
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p_schro_params->eos_pulled = 0;
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p_schro_params->eos_signalled = 0;
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AVCodec libschroedinger_decoder = {
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sizeof(FfmpegSchroDecoderParams),
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libschroedinger_decode_init,
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libschroedinger_decode_close,
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libschroedinger_decode_frame,
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.flush = libschroedinger_flush,
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.long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),