mirror of
https://github.com/FFmpeg/FFmpeg.git
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737eb5976f
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
362 lines
12 KiB
C
362 lines
12 KiB
C
/*
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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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*
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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
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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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*/
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#include "libavutil/imgutils.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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#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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/** 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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/** decoder handle */
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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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int eos_signalled;
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/** end of sequence pulled */
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int eos_pulled;
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/** decoded picture */
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AVPicture dec_pic;
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} FfmpegSchroDecoderParams;
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typedef struct FfmpegSchroParseUnitContext {
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const uint8_t *buf;
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int buf_size;
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} FfmpegSchroParseUnitContext;
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static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
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void *priv);
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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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{
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parse_ctx->buf = buf;
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parse_ctx->buf_size = buf_size;
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}
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static SchroBuffer* FfmpegFindNextSchroParseUnit(FfmpegSchroParseUnitContext *parse_ctx)
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{
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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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return NULL;
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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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parse_ctx->buf[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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next_pu_offset = 13;
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if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
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return NULL;
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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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return enc_buf;
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}
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/**
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* Returns FFmpeg chroma format.
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*/
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static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt)
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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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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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return PIX_FMT_NONE;
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}
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static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
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{
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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_init();
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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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return -1;
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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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return 0;
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}
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static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
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void *priv)
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{
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av_freep(&priv);
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}
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static void libschroedinger_decode_frame_free(void *frame)
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{
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schro_frame_unref(frame);
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}
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static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
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{
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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 (av_image_check_size(p_schro_params->format->width, p_schro_params->format->height,
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0, avccontext) < 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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return;
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}
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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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return;
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}
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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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avccontext->pix_fmt,
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avccontext->width,
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avccontext->height);
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}
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static int libschroedinger_decode_frame(AVCodecContext *avccontext,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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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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SchroFrame* frame;
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int state;
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int go = 1;
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int outer = 1;
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FfmpegSchroParseUnitContext parse_ctx;
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*data_size = 0;
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FfmpegSchroParseContextInit(&parse_ctx, buf, buf_size);
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if (!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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}
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}
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/* Loop through all the individual parse units in the input buffer */
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do {
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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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go = 1;
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} else
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outer = 0;
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format = p_schro_params->format;
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while (go) {
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/* Parse data and process result. */
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state = schro_decoder_wait(decoder);
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switch (state) {
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case SCHRO_DECODER_FIRST_ACCESS_UNIT:
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libschroedinger_handle_first_access_unit(avccontext);
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break;
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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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go = 0;
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break;
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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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break;
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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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if (frame)
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ff_dirac_schro_queue_push_back(&p_schro_params->dec_frame_queue,
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frame);
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break;
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case SCHRO_DECODER_EOS:
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go = 0;
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p_schro_params->eos_pulled = 1;
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schro_decoder_reset(decoder);
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outer = 0;
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break;
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case SCHRO_DECODER_ERROR:
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return -1;
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break;
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}
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}
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} while (outer);
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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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if (frame) {
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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->pix_fmt,
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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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}
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return buf_size;
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}
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static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
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{
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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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return 0;
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}
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static void libschroedinger_flush(AVCodecContext *avccontext)
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{
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/* Got a seek request. Free the decoded frames queue and then reset
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* the decoder */
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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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}
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AVCodec ff_libschroedinger_decoder = {
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"libschroedinger",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_DIRAC,
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sizeof(FfmpegSchroDecoderParams),
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libschroedinger_decode_init,
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NULL,
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libschroedinger_decode_close,
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libschroedinger_decode_frame,
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CODEC_CAP_DELAY,
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.flush = libschroedinger_flush,
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.long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
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};
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