/* * Copyright (c) 2001 Fabrice Bellard * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Options definition for AVCodecContext. */ #include "avcodec.h" #include "internal.h" #include "libavutil/avassert.h" #include "libavutil/internal.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include <float.h> /* FLT_MIN, FLT_MAX */ #include <string.h> FF_DISABLE_DEPRECATION_WARNINGS #include "options_table.h" FF_ENABLE_DEPRECATION_WARNINGS static const char* context_to_name(void* ptr) { AVCodecContext *avc= ptr; if(avc && avc->codec && avc->codec->name) return avc->codec->name; else return "NULL"; } static void *codec_child_next(void *obj, void *prev) { AVCodecContext *s = obj; if (!prev && s->codec && s->codec->priv_class && s->priv_data) return s->priv_data; return NULL; } static const AVClass *codec_child_class_next(const AVClass *prev) { AVCodec *c = NULL; /* find the codec that corresponds to prev */ while (prev && (c = av_codec_next(c))) if (c->priv_class == prev) break; /* find next codec with priv options */ while (c = av_codec_next(c)) if (c->priv_class) return c->priv_class; return NULL; } static const AVClass av_codec_context_class = { .class_name = "AVCodecContext", .item_name = context_to_name, .option = avcodec_options, .version = LIBAVUTIL_VERSION_INT, .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset), .child_next = codec_child_next, .child_class_next = codec_child_class_next, }; static int init_context_defaults(AVCodecContext *s, const AVCodec *codec) { memset(s, 0, sizeof(AVCodecContext)); s->av_class = &av_codec_context_class; s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN; s->codec = codec; av_opt_set_defaults(s); s->time_base = (AVRational){0,1}; s->framerate = (AVRational){ 0, 1 }; s->get_buffer2 = avcodec_default_get_buffer2; s->get_format = avcodec_default_get_format; s->execute = avcodec_default_execute; s->execute2 = avcodec_default_execute2; s->sample_aspect_ratio = (AVRational){0,1}; s->pix_fmt = AV_PIX_FMT_NONE; s->sw_pix_fmt = AV_PIX_FMT_NONE; s->sample_fmt = AV_SAMPLE_FMT_NONE; s->reordered_opaque = AV_NOPTS_VALUE; if(codec && codec->priv_data_size){ if(!s->priv_data){ s->priv_data= av_mallocz(codec->priv_data_size); if (!s->priv_data) { return AVERROR(ENOMEM); } } if(codec->priv_class){ *(const AVClass**)s->priv_data = codec->priv_class; av_opt_set_defaults(s->priv_data); } } if (codec && codec->defaults) { int ret; const AVCodecDefault *d = codec->defaults; while (d->key) { ret = av_opt_set(s, d->key, d->value, 0); av_assert0(ret >= 0); d++; } } return 0; } #if FF_API_GET_CONTEXT_DEFAULTS int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec) { return init_context_defaults(s, codec); } #endif AVCodecContext *avcodec_alloc_context3(const AVCodec *codec) { AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext)); if (!avctx) return NULL; if (init_context_defaults(avctx, codec) < 0) { av_free(avctx); return NULL; } return avctx; } void avcodec_free_context(AVCodecContext **pavctx) { AVCodecContext *avctx = *pavctx; if (!avctx) return; avcodec_close(avctx); av_freep(&avctx->extradata); av_freep(&avctx->subtitle_header); av_freep(pavctx); } #if FF_API_COPY_CONTEXT int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src) { const AVCodec *orig_codec = dest->codec; uint8_t *orig_priv_data = dest->priv_data; if (avcodec_is_open(dest)) { // check that the dest context is uninitialized av_log(dest, AV_LOG_ERROR, "Tried to copy AVCodecContext %p into already-initialized %p\n", src, dest); return AVERROR(EINVAL); } memcpy(dest, src, sizeof(*dest)); dest->priv_data = orig_priv_data; dest->codec = orig_codec; /* set values specific to opened codecs back to their default state */ dest->slice_offset = NULL; dest->hwaccel = NULL; dest->internal = NULL; /* reallocate values that should be allocated separately */ dest->extradata = NULL; dest->intra_matrix = NULL; dest->inter_matrix = NULL; dest->rc_override = NULL; dest->subtitle_header = NULL; dest->hw_frames_ctx = NULL; #if FF_API_MPV_OPT FF_DISABLE_DEPRECATION_WARNINGS dest->rc_eq = NULL; if (src->rc_eq) { dest->rc_eq = av_strdup(src->rc_eq); if (!dest->rc_eq) return AVERROR(ENOMEM); } FF_ENABLE_DEPRECATION_WARNINGS #endif #define alloc_and_copy_or_fail(obj, size, pad) \ if (src->obj && size > 0) { \ dest->obj = av_malloc(size + pad); \ if (!dest->obj) \ goto fail; \ memcpy(dest->obj, src->obj, size); \ if (pad) \ memset(((uint8_t *) dest->obj) + size, 0, pad); \ } alloc_and_copy_or_fail(extradata, src->extradata_size, AV_INPUT_BUFFER_PADDING_SIZE); alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0); alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0); alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0); alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 0); dest->subtitle_header_size = src->subtitle_header_size; #undef alloc_and_copy_or_fail if (src->hw_frames_ctx) { dest->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx); if (!dest->hw_frames_ctx) goto fail; } return 0; fail: av_freep(&dest->subtitle_header); av_freep(&dest->rc_override); av_freep(&dest->intra_matrix); av_freep(&dest->inter_matrix); av_freep(&dest->extradata); av_buffer_unref(&dest->hw_frames_ctx); #if FF_API_MPV_OPT FF_DISABLE_DEPRECATION_WARNINGS av_freep(&dest->rc_eq); FF_ENABLE_DEPRECATION_WARNINGS #endif return AVERROR(ENOMEM); } #endif const AVClass *avcodec_get_class(void) { return &av_codec_context_class; }