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); } av_opt_free(dest); av_free(dest->priv_data); 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->rc_eq = NULL; dest->extradata = NULL; dest->intra_matrix = NULL; dest->inter_matrix = NULL; dest->rc_override = NULL; dest->subtitle_header = NULL; if (src->rc_eq) { dest->rc_eq = av_strdup(src->rc_eq); if (!dest->rc_eq) return AVERROR(ENOMEM); } #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, FF_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, 1); dest->subtitle_header_size = src->subtitle_header_size; #undef alloc_and_copy_or_fail return 0; fail: av_freep(&dest->rc_override); av_freep(&dest->intra_matrix); av_freep(&dest->inter_matrix); av_freep(&dest->extradata); av_freep(&dest->rc_eq); return AVERROR(ENOMEM); }
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)) {  