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